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Synchronizing

Subclass of:

370 - Multiplex communications

370464000 - COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS

370498000 - Combining or distributing information via time channels

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
370509000 Using synchronization information contained in a frame 52
370516000 Adjusting for phase or jitter 32
370505000 Pulse stuffing or deletion 6
370507000 Mutual (reciprocal) synchronization 2
20090010283Synchronization method of electronic apparatuses - A synchronization method is cooperated with a master apparatus and a plurality of slave apparatuses. The synchronization method includes at least a transmitting process, at least a responding process, at least a receiving process, a calculating process and a time-adjusting process. The transmitting process is for transmitting a synchronization message to at least one of the slave apparatuses through a network and recording a transmitting time by the master apparatus. The responding process is for transmitting a responding message to the master apparatus through the network and record a responding time after the slave apparatus receives the synchronization message. The receiving process is for receiving the responding message and recording a receiving time by the master apparatus. The calculating process is for calculating a time-adjusted amount by the master apparatus according to at least one set of the transmitting time, the responding time and the receiving time derived from the transmitting process, the responding process and the receiving process. The time-adjusting process is for transmitting the time-adjusted amount to the slave apparatus by the master apparatus and adjusting the time clock according to the time-adjusted amount by the slave apparatus.01-08-2009
20120155497APPARATUS AND METHOD FOR ESTIMATING TIME STAMP - An apparatus includes a difference extraction unit to extract a difference between a second time stamp value, which is obtained by adjusting a first time stamp value that is measured at a time of arrival of a synchronization message transmitted by the master at a Layer 3 to be synchronized in frequency with a clock of the master, and a third time stamp value, which is measured at a time of departure of the synchronization message from the master; a minimum filter to select a minimum from one or more difference values extracted by the difference extraction unit; and a delay variation calculation unit to estimate a time of arrival of a current synchronization message at the Layer 3 based on the selected minimum and calculate a delay variation.06-21-2012
370504000 Reference indication consists of a gap 2
20090257459SYSTEM, APPARATUS, AND METHOD FOR INCREASING RESILIENCY IN COMMUNICATIONS - A transmitting system inserts runt abort packets in an outgoing data stream during idle time inter-frame time fill. The runt abort packets cause the receiving system to synchronize itself to the transmitting system so that even if an error during inter-frame time fill causes the receiving system to go into an erroneous state, the receiving system will be synchronized with the transmitting system before receiving valid data. In one embodiment, the transmitting system transmits data in packets over SONET, The packet data is scrambled at the transmitting end and descrambled at the receiving end. Runt abort packets. sent during inter-frame time fill resynchronize the descrambler. If there is an error in the inter-frame time fill bytes, causing the receiving end descrambler to no longer be synchronized with the transmitting end scrambler, the runt abort packets will cause the descrambler to resynchronize state with the transmitting scrambler.10-15-2009
20130177030METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION CHANNEL, AND METHOD AND APPARATUS FOR RECEIVING SYNCHRONIZATION CHANNEL - In a direct communication between terminals, a terminal transmits a synchronization channel preamble part after transmitting a synchronization channel message part including synchronization information. The terminal receives a dedicated channel including a direct communication packet after transmitting the synchronization channel preamble part. A transition time gap for switching from transmission to reception may be inserted to an end of the synchronization channel preamble part.07-11-2013
Entries
DocumentTitleDate
20100061406CLOCK SYNCHRONIZATION METHOD FOR USE IN COMMUNICATION SYSTEM FOR TRANSMITTING AT LEAST ONE OF VIDEO DATA AND AUDIO DATA - A source device counts a clock CLKpixel for pixel data using a transmitting counter, adds a counted value Csource(t) of the transmitting counter at a timing of transmitting a video packet Pvideo to the sink device to a header part of the video packet Pvideo as a time stamp value Csource(t), and transmits the video packet Pvideo to the sink device. The sink device receives the video packet Pvideo, extracts the time stamp value Csource(t) from the header part of the video packet Pvideo, generates a fixed reference clock CLKref based on the counted value Csource(t) of the transmitting counter using a first PLL, circuit, and generates the clock CLKpixel for the pixel data of the source device based on the reference clock CLKref using a second PLL circuit.03-11-2010
20090196311INITIATION AND EXPIRATION OF OBJECTS IN A KNOWLEDGE BASED FRAMEWORK FOR A MULTI-MASTER SYNCHRONIZATION ENVIRONMENT - The subject disclosure relates to synchronizing among network nodes in a multi-master synchronization environment where a knowledge based synchronization framework is extended to include notions of initiation and/or expiration of synchronized object(s). Advantageously, according to the synchronization framework, endpoints can synchronize data in a way that allows a definition of when one or more objects of the synchronized data should come into existence for purposes of a knowledge exchange and/or when one or more objects of the synchronized data should cease to exist for purposes of a knowledge exchange. In one embodiment, additional dimension(s) are placed on a knowledge vector for a given object that represent incremental lifetime information for the object, which is accounted for during the synchronization process to allow operations on the object by synchronizing applications or processes during its lifetime.08-06-2009
20090122812SAFE START-UP OF A NETWORK - A method for start-up of a network, including a number of nodes, which are connected via channels. The nodes exchange information in the form of messages via the channels. The transition phase of a synchronizing node from its initial phase to a synchronized phase is separated in a first integration phase and a second subsequent cold-start phase. A synchronizing node in the integration phase listens to messages being sent from nodes in the synchronized phase and only reacts to an integration message (i-frame) if the integration message is a valid message. Furthermore, a synchronizing node, wherein integration of the synchronizing node to a set of already synchronized nodes was not successful after a specifiable period, changes into the cold-start phase, in which a cold-start procedure of the node is extracted, wherein in the cold-start phase the node does not react to integration messages of a node in the synchronized phase.05-14-2009
20080259967Method and arrangement for transmitting time stamp information - The invention relates to transmitting time information between elements of a data network. In the present invention, it has surprisingly been discovered that in a network transmitting packet, frame or cell switched data traffic, time stamp information can be transmitted from a network element (10-23-2008
20080259965Receiving Data Comprising Synchronization Information - A method receives data including synchronization information. The method includes obtaining a synchronization for receiving the data based on the synchronization information. The method includes generating, during receiving of the data, maintenance information indicative of whether the synchronization is being maintained based on the synchronization information. The method includes continuing, upon loss of the synchronization, to generate the maintenance information based on the synchronization.10-23-2008
20100008384NETWORK EQUIPMENT - A network equipment (element) is provided with at least one SDH unit, connected to an SDH link or SONET link, extracting and outputting a first line clock synchronized with a received signal; at least one Ethernet unit, connected to an Ethernet link, extracting a second line clock synchronized with a received signal and converting the second line clock into a clock of a frequency of the first line clock to be outputted; and a timing processor receiving the clocks of the frequency of the first line clock from the SDH unit and the Ethernet unit, selecting among the clocks a clock of the best quality and outputting an equipment clock synchronized with the clock selected.01-14-2010
20100135335FRAME SYNCHRONIZER, FRAME SYNCHRONIZATION METHOD AND DEMODULATOR - The present invention relates to a frame synchronizer, frame synchronization method and demodulator which can more positively establish frame synchronization of an input signal which is likely to have a plurality of frame lengths.06-03-2010
20100118894DIFFERENTIAL TIMING TRANSFER OVER SYNCHRONOUS ETHERNET USING DIGITAL FREQUENCY GENERATORS AND CONTROL WORD SIGNALING - A method, system and master service interface transfer differential timing over a packet network. The transmitting service interface receives a service clock and is coupled to a receiving service interface through a network backplane. A primary reference clock is provided to time the network backplane. The primary reference clock and the service clock are used to synthesize a copy of the service clock connected to the transmitting service interface. A first control word containing an error differential between the service clock and the synthesized copy of the service clock is generated and transmitted through the network backplane via a packet. The first control word, together with the primary reference clock, is used to recreate the service clock for timing the receiving service interface.05-13-2010
20100118896METHOD AND ANALYSIS OF SYNCHRONIZED DATA TRAFFIC OF A PACKET AND ADDRESS-ORIENTED DATA NETWORK AND CONFIGURATION OF SUCH A DATA NETWORK FOR THE IMPLEMENTATION OF THE METHOD - In a method and network for the analysis of synchronized data traffic, at least one network participant stores sent and/or received data packets in a mirror memory, and the data in the respective mirror memories are frozen and made available for evaluation via the entire data network, upon the occurrence of a trigger event in at least one of the active network participants, while maintaining the synchronized data traffic.05-13-2010
20100074278Timing Distribution Within a Network Element While Supporting Multiple Timing Domains - According to one embodiment of the invention, a network element synchronizes a number of clocks within the system while supporting multiple independent timing domains. The network element includes a local clock, which is free-running and is not necessarily synchronized with an external reference, that synchronously provides a local time value to the slave and master interfaces of each timing domain. Each slave interface of each timing domain independently determines timing information based on a received master clock synchronization event and the value of the local time when that synchronization event was received. The timing information is distributed to the master interfaces of the appropriate timing domain, and each master interface calculates an adjusted synchronization event based on the received timing information and the value of the local time when that timing information was received. The adjusted synchronization events are transmitted out of the network element to an external slave interface.03-25-2010
20130077642SYSTEMS AND METHODS UTILIZING RANDOMIZED CLOCK RATES TO REDUCE SYSTEMATIC TIME-STAMP GRANULARITY ERRORS IN NETWORK PACKET COMMUNICATIONS - Systems and methods are disclosed for utilizing slave (receive) time-stamp clock rates that are different from master (sender) time-stamp clock rates to randomize and thereby reduce systematic time-stamp granularity errors in the communication of network packets. The slave (receive) time-stamp clock rate for some embodiments is set to be a fixed value that has a relationship with the master (sender) time-stamp clock rate such that the ratio of the slave (receive) clock rate to the master (sender) clock rate is a rational number. Other embodiments use a time-varying frequency for the slave (receive) time-stamp clock rate to randomize the slave (receive) time-stamp clock with respect to the master (sender) time-stamp clock. Additional time-stamps can also be generated using a slave (receive) time-stamp clock having a rate set to equal the rate of the master (sender) time-stamp clock signal. Further spread spectrum and/or delta-sigma modulation techniques can be applied to effectively randomize the slave (receive) time-stamp clock.03-28-2013
20100111113NETWORK ELEMENT CLOCKING ACCURACY AND STABILITY MONITORING OVER A PACKET-SWITCHED NETWORK - Various exemplary embodiments include a method and related system and monitoring entity including one or more of the following: generating timing information at a master node in a packet-switched network, the timing information specifying a value of a master clock; communicating the timing information from the master node to a plurality of slave nodes over a first plurality of time-division multiplexing (TDM) pseudowires; running a digital phase-locked loop on each slave node to synchronize each slave node to the master clock, wherein each digital phase-locked loop outputs a frequency at which the respective slave node is operating; sending the frequency outputted by each digital phase-locked loop to a monitoring entity over a second plurality of TDM pseudowires; utilizing the outputted frequencies at the monitoring entity to identify all slave nodes that are experiencing timing problems; and implementing a remedial measure for all slave nodes that are experiencing timing problems.05-06-2010
20100322267TIME SYNCHRONIZATION SYSTEM AND TIME SYNCHRONIZATION METHOD IN TRAIN - An inter-vehicle network that connects monitoring and control devices communicating with an intra-vehicle network that couples in-vehicle devices with the monitoring and control devices. A train clock station at an uppermost level in a hierarchical structure and a vehicle clock station in a middle level in a hierarchical structure are established from the monitoring and control devices. Other devices are established as a correction information waiting station at a lowermost level in the hierarchical structure. The train clock station performs a time correction of its own station with time information that is arbitrarily obtained as reference time. The vehicle clock station performs a time correction of its own station based on a message transmitted from the train clock station. The correction information waiting station performs a time correction of its own station based on a message transmitted from the vehicle clock station.12-23-2010
20090147806SYNCHRONIZATION OF NETWORK NODES - A method and apparatus are provided to achieve frequency synchronization between a first clock at a first node and a second clock at a second node of a packet-carrying communications network. At the first node: a property of packet transmission through the network between the first node and the second node is measured; and the measurement of the property is sent to the second node. At the second node, the same property of packet transmission through the network between the first node and the second node is measured. The measurement of the property made at the first node and the measurement of the property made at the second node are used to synchronize the frequency of the second clock with respect to the first clock.06-11-2009
20100040091BLIND CHANNEL QUALITY ESTIMATOR - An embodiment is a method and apparatus to perform symbol synchronization. A sign element obtains signs of samples in a sample vector. A correlation estimator computes a correlation of the sample vector. A synchronization detector detects symbol synchronization.02-18-2010
20100040090SYNCHRONIZATION METHOD FOR ALLOWING FIXED TIME DELAY AND BRIDGE EMPLOYING THE SAME - Provided are a time synchronization method allowing a fixed time delay and a bridge that is interposed between a master and a slave, according to the method. In the bridge, a predetermined time after the synchronization packet is set as an output time of the synchronization packet and the synchronization packet is output at the output time. Accordingly, it is possible to delay synchronization packets in the bridge for the same time, thereby increasing the time synchronization precision.02-18-2010
20130083809COMMUNICATIONS SYSTEM FOR TRANSMISSION OF SIGNALS BETWEEN TERMINAL EQUIPMENT CONNECTED TO INTERMEDIATE EQUIPMENT CONNECTED TO AN ETHERNET NETWORK - A communication system for transmission of signals between various terminal equipment connected to various intermediate equipment and connected to a communications network using the Ethernet protocol is disclosed. In one aspect, the terminal equipment is not master-controlled by a distributed clock and the intermediate equipment each includes at least one Ethernet access physical interface. In the communication system, reference time information is periodically transmitted by the reference clock generator and distributed as data transport packets to the intermediate equipment via the Ethernet access physical interface. Each intermediate equipment includes a local clock generator, the reference time information is received and processed by each intermediate equipment, so as to subordinate the local clock generator to the reference clock. The mechanism configured to process the signals is clocked by the local clock generator so as to obtain synchronous processing of the transmitted signals.04-04-2013
20100142562INTERFACE APPARATUS AND RESYNCHRONIZATION METHOD - An interface apparatus that transmits and receives data to and from another node coupled via a bus cable includes a port coupled to a port of the another node through the bus cable, a connection management state machine which corresponds to the port and changes the port from an active state to an inactive state when a synchronism of the port is lost, a state transition suppression circuit which generates a state transition suppression signal to suppress the change of the port from the active state to the inactive state, and a synchronization state machine that starts a resynchronization of the port in the active state based on the detection of the synchronism of the port being lost.06-10-2010
20100329285MECHANISM FOR CLOCK SYNCHRONIZATION - A method and apparatus for synchronizing time between a master device and a target device arranged across a network, wherein the target device communicates to the master device through a PCIe interconnect includes transmitting a first message at a first time from the master device to the target device, the first message including a message indicator; and receiving a reply message at a subsequent time from the target device to the master device, the reply message including the message indicator.12-30-2010
20130089110Mechanism For Channel Synchronization - A channel synchronization method in which local serializers serially transmits first n-bit codes, respectively, to remote deserializers, respectively. Also local deserializers serially receive first n-bit codes, respectively, from remote serializers, respectively. One of the first n-bit codes transmitted to one of the remote serializers indicates one of the local deserializers is not link aligned.04-11-2013
20090323728ASYNCHRONOUS DATA FIFO THAT PROVIDES UNINTERRUPTED DATA FLOW - An asynchronous FIFO is provided that determines whether its buffer is primed with at least one data element during a data transfer across clock domains in order to eliminate metastability issues that cause data stalls and interruptions in data flow.12-31-2009
20120219019METHOD AND ARRANGEMENT FOR SYNCHRONISING DATA STREAMS IN NETWORKS AND A CORRESPONDING COMPUTER PROGRAM AND CORRESPONDING COMPUTER-READABLE STORAGE MEDIUM - The invention relates to a method and arrangement for synchronising data streams in networks and to a corresponding computer program and corresponding computer-readable storage medium which can be used, in particular, for synchronising different audio playback devices (audio adapters) within a home network. Said home network can be a conventional computer network comprising both wireline and wireless components. According to the invention, in order to synchronise the data output in networks in which at least one data stream is transmitted by a network unit to at least two output units of the network, where said stream is outputted, first common time information is made available to at least the output units and the output of the data in the data stream is synchronised at least in terms of the phase and/or frequency on the basis of the first common time information.08-30-2012
20090016382System and Method for High-Speed Applications over a Serial Multi-Drop Communication Network - Broadcasting of high-speed applications over a serial multi-drop communication network is achieved by time-division multiplexing the high-speed applications to produce a data stream, framing the data stream into frames having a header of a size lower than 32 bits and a parity bit, transmitting the frames with pre-emphasis over the serial multi-drop communication network, receiving the frames with de-emphasis from the serial multi-drop communication network, detecting a predetermined bit pattern in the received frames, synchronizing the received frames using an internal clock signal and an external clock signal found within the frames following a phase comparison made after detection of the predetermined bit pattern, and de-framing the synchronized frames into a selected one of the high-speed applications. The system implementing the above process is adapted to broadcast hi-fi audio channels and possibly other types of data to entertainment stations connected to the communication network.01-15-2009
20130058362Receiving Apparatus and Method for Multi-Frame Synchronization - The present invention discloses a multi-frame synchronization method, the method comprises: for each received sub-frame, a receiver determining a probability that the received sub-frame is each of sub-frames in a multi-frame, a sub-frame with maximum probability being a state of the currently received sub-frame after N sub-frames are received. The present invention further discloses a receiving apparatus for multi-frame synchronization comprising a calculation module; wherein the calculation module is configured to calculate a probability that a received sub-frame is each of sub-frames in a multi-frame, and determine a state of the currently received sub-frame based on a sub-frame with maximum probability after N sub-frames are received. The present invention effectively achieves a position for multi-frame synchronization and low calculation complexity.03-07-2013
20080298398Transparent Spider - A timing bridge device is used to gain boundary and transparent clock functionality using conventional network components on those network links that require good timing distribution. This timing path is invisible to the network component.12-04-2008
20090268759SYSTEM AND METHOD FOR DETECTING AND CORRECTING A FALSE EMBEDDED HEADER - There is provided a system and method for detecting and correcting a false embedded header. More specifically, in one embodiment, there is provided a method, comprising locating an ancillary data packet in a data stream based on a first sequence of data indicative of the ancillary data packet, determining if the ancillary data packet contains a second sequence of data indicative of sync information, and altering the second sequence of data to not indicate sync information if the ancillary data packet does contain the second sequence of data.10-29-2009
20090268758METHOD, SYSTEM AND APPARATUS FOR SYNCHRONIZING TIME IN TIME-DIVISION MULTIPLEXING SYSTEM - A method, system and apparatus for synchronizing time in a time-division multiplexing (TDM) system are disclosed. The method may include: receiving time synchronization information carried in an idle timeslot, where the idle timeslot is in a multiframe of an E1 signal or T1 signal; and synchronizing time according to the time synchronization information carried in the timeslot. The present disclosure may synchronize the time of the communication device in the TDM system while saving the cost, eliminating the necessity of installation and improving the stability of the time synchronization.10-29-2009
20130064253APPARATUS AND METHODS FOR MULTI-STAGE MULTIPLEXING IN A NETWORK - Methods and apparatus for performing multiplexing of video or other content (e.g., programs) within a network using feed-back from a subsequent digital program insertion stage, and/or feed-forward information from a prior multiplexing stage. In one embodiment, the network comprises a hybrid fiber coax (HFC) cable network having headend and hub-based statistical multiplexing stages, and communication between the two stages is used to improve the visual quality performance and bandwidth utilization of the output multi-program stream during conditions where downstream content is inserted into the transport stream. Business methods associated with the various multiplexing features described above are also disclosed.03-14-2013
20130163617MULTI-PROTOCOL I/O INTERCONNECT TIME SYNCHRONIZATION - Described are embodiments of methods, apparatuses, and systems for time synchronization of a multi-protocol I/O interconnect of computer apparatus. A method for synchronizing time across the multi-protocol I/O interconnect may include providing a first local time of a first switch of a switching fabric of a multi-protocol interconnect to a second switch of the switching fabric, and adjusting a second local time of the second switch to the first local time. Other embodiments may be described and claimed.06-27-2013
20090238214TIME SYNCHRONIZATION METHOD, TIME SYNCHRONIZATION EQUIPMENT AND NETWORK COMMUNICATION SYSTEM - A time synchronization method includes the following steps. First, network communication equipment receives time information sent by at least two time servers respectively, in which the time information includes time synchronization status information of each of the time servers. Then, it is determined whether time synchronization status of each of the time servers is normal or not according to the time synchronization status information. Finally, the network communication equipment selects to employ the time information provided by the time servers with the normal time synchronization status from the at least two time servers. Network communication equipment and a network communication system are also provided correspondingly. The network communication equipment is capable of employing the time information provided by the time server with the normal time synchronization status according to the time synchronization status of each of the time servers, thereby improving precision and reliability of the time information obtained by the network communication equipment.09-24-2009
20090238213Network synchronization system and information processing device - In a network synchronization system including plural information processing devices, a first information processing device includes a synchronization-use common storage unit configured to copy and store first information for each user authorized to use the first information processing device, so that the first information can be shared with another information processing device; and a second information processing device includes a setting information unit configured to store second information for each user authorized to use the second information processing device, and a synchronization control unit configured to compare the second information with the first information, and to update the second information to latest information based on a result of the comparison. The synchronization control unit acquires common update information common to the information processing devices, which is stored in the synchronization-use common storage unit.09-24-2009
20090232165DIGITAL BROADCAST MULTIPLEXING APPARATUS - In a digital broadcast multiplexing apparatus for multiplexing a plurality of programs on a single physical channel so as to broadcast the digital multiplexed broadcasting program, there are provided with an apparatus for correcting positions of PCR packets contained in transport streams within the respective programs, and a PCR correction value forming apparatus for applying values of correcting PCR values with respect to a result of the position corrections in order to simply execute a function capable of uniformly synchronizing the PCR packets contained in the transport streams and capable of viewing the received programs without any interruption on the reception side even when a tuning operation is carried out. Then, the digital broadcast multiplexing apparatus outputs such a broadcast program packet stream which has been multiplexed as a single broadcast program in such a manner that the PCR packets are synchronized with each other among the plurality of programs.09-17-2009
20090046744COMMUNICATION CONTROL APPARATUS, COMMUNICATION CONTROL METHOD, AND COMPUTER PROGRAM - A communication control apparatus includes a packetizing unit configured to generate packets based on coded data; a calculating unit configured to calculate, based on at least one of information regarding the amount of code of the coded data, reception state information indicating a reception state of a reception device serving as a transmission destination to which the packets are to be transmitted, information regarding the effective speed of a communication line to be used for transmission of the packets, and information regarding an available capacity of a communication channel that can be ensured for communication of the packets, the number of packets to be continuously transmitted; and a transmitting unit configured to continuously transmit, via the communication line to the reception device, packets corresponding to the number of packets calculated by the calculating unit.02-19-2009
20080298399Methods for Synchronizing the Transmission and the Reception of a Media Stream Over a Network - The present invention relates to methods for synchronizing the transmission and the reception of a media stream over a network, such as the Internet, comprising of a receiver clock having an adjustable reset value, where the adjustable reset value may be a function of the reference time for a receiver clock and the reference time for a sender clock.12-04-2008
20130163618METHOD FOR MONITORING AND MANAGING DATA NETWORKS - A method and a network node are provided, for distributing timing information in a packet-switched network. The method is characterized in that at least one network node used as a quasi slave node is located at a path extending between a master node and a slave node. The method comprising a step of calculating the timing at that network node, by passively processing packets belonging to a PTP-type packet stream being exchanged between the master node and the slave node and conveyed via that intermediate network node operating as a quasi slave.06-27-2013
20100278198METHOD AND APPARATUS FOR PROVIDING QUANTIZATION OF SYNCHRONIZATION SIGNALS - An apparatus for providing quantization of synchronization signals may include a processor and a memory storing executable instructions. In response to execution of the instructions by the processor, the apparatus may perform at least receiving an indication of a first variable defining a communication parameter with respect to communications associated with a serving node, receiving an indication of a second variable defining the communication parameter with respect to communications associated with a neighbor node, determining variable information based on a difference between the first variable and the second variable, and providing the variable information to the serving node in a quantized message enabling the serving node to modify a value associated with the first variable to reduce the difference between the first variable and the second variable. A corresponding method and computer program product are also provided.11-04-2010
20110158262ALLOCATION ADJUSTMENT IN NETWORK DOMAINS - A network node in a resource reservation network includes a data receiver, a transmitter and a timing adjustment requester. The data receiver receives fixed size application protocol data units (APDUs) from an application at fixed intervals. The transmitter transmits data from the network node to the network within transmission opportunities (TXOPs) associated with a constant data service flow for the application specified associated with the application and the network node in a media access plan (MAP) generated by a network scheduler. The timing adjustment requester requests adjustments of the network scheduler to the timing of TXOPs associated with the constant data service flow in order to minimize a delay between the arrival of the APDUs and their transmittal to the network.06-30-2011
20110103407Network Traffic Synchronization Mechanism - Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur. As discussed below, the network traffic synchronization mechanism can be applied to a variety of network devices, such as firewalls, gateways, network routers, and bandwidth management devices.05-05-2011
20100220747METHOD AND APPARATUS FOR SYNCHRONIZING NODES - During each node's awake period, each node multicasts the relative time or slot of their next awake period (beaconing interval) to all neighboring nodes. This enables each node to intelligently and independently schedule the time slot of its next transmission based on the beaconing intervals of the nodes it has heard from. During each active (awake) interval, a node builds statistics of the future transmission/receive times of its neighbors and uses them to determine its next transmission time. In one proposed implementation, at the end of an active interval, a node picks the time slot with the highest counter for its next transmission. In another proposed implementation, at the end of an active interval, a node picks one of the slots with a weighted probability; the weight of each slot is proportional with the value of the counter associated with the slot09-02-2010
20080317069Speed negotiation for multi-speed communication devices - A method includes defining a pattern of time intervals, each time interval having a respective assigned communication speed, which alternates among multiple communication speeds supported by a first communication device. Synchronization requests are transmitted over a communication medium from the first communication device to a second communication device at the respective communication speed that is assigned in each interval in accordance with the pattern. While transmitting the synchronization requests, synchronization replies sent over the communication medium in response to the synchronization requests are received only at the respective communication speed that is assigned in each interval. Responsively to receiving the synchronization replies from the second communication device, one or more common communication speeds that are supported by both the first and the second communication devices are identified. Communication is established between the first and second communication devices over the communication medium using one of the common communication speeds.12-25-2008
20100166020MLPPP SEQUENCE NUMBER SYNCHRONIZATION BETWEEN THE ACTIVE AND STANDBY TRANSMITTERS - A method and system for MLPPP sequence number synchronization between the active and standby side transmitters is disclosed. The MLPPP sequence number synchronization system includes a method for the standby side to associate transmit frame fragment numbers used by the active side to those generated by the transmitter on the standby side. The association is used to produce an offset which is used to synchronize the active and standby transmitters. The MLPPP sequence number synchronization system is particularly useful for overcoming the drawbacks of high bandwidth signaling between active and standby sides of switches known in the art.07-01-2010
20090207864CIRCUITRY AND METHOD FOR DETECTION OF NETWORK NODE AGING IN COMMUNICATION NETWORKS - The network node includes a local crystal oscillator for providing a time reference derived from the clock signal produced by the local crystal oscillator, a reset stage for resetting the network node in response to a bus reset pulse received through the network and a control means for issuing a bus reset pulse of a predetermined length substantially greater than a clock period of the clock signal of the local crystal oscillator. Further the network node includes a bus reset detector for determining a length of the received bus reset pulse based on the local time reference. The bus reset detector in the network node is also adapted to adjust the local time reference based on the determined length of the received bus reset pulse.08-20-2009
20090141744AUTOCRATIC LOW COMPLEXITY GATEWAY/ GUARDIAN STRATEGY AND/OR SIMPLE LOCAL GUARDIAN STRATEGY FOR FlexRay OR OTHER DISTRIBUTED TIME-TRIGGERED PROTOCOL - A special node is used in a distributed time-triggered cluster. The special node comprises protocol functionality to establish a time base to use in communicating with a plurality of end nodes and to source timing-related frames to the plurality of end nodes in accordance with the distributed time-triggered communication protocol. The protocol functionality establishes the time base without regard to any timing-related frame sourced from any of the plurality of end nodes. In one embodiment, the protocol functionality of the special node is implemented in a low complexity manner. In one embodiment, the cluster comprises a star topology and the special node performs at least one of semantic filtering and rate enforcement. In another embodiment, the cluster comprises a bus or peer-to-peer topology and each end node is coupled to the communication channel using a low-complexity special local bus guardian.06-04-2009
20080279223Method for Synchronizing Charging Processes Involved in Performance of Service on Network Elements in Communication Network - A control protocol using mechanisms of a transport protocol is used to distribute control messages containing specific dedicated information for each charging process involved in the performance of a service or application to each charging process required in the performance of the service or application.11-13-2008
20090103572Crosstalk Minimization in Serial Link Systems - Described are methods and circuits for reducing the error-inducing effects of crosstalk. Communication circuits in accordance with some embodiments adjust the phase of transmitted “aggressor” data to misalign transmitted signals from the perspective of “victim” channels. This misalignment moves the noise artifacts cross coupled to the victim channel away from sensitive sample times in the victim data, and consequently reduces the net effects of aggressor crosstalk on neighboring victim channels. Some embodiments reduce the effects of crosstalk by introducing static timing offsets to one or a plurality of aggressor transmitters, one or a plurality of victim transmitters, or some combination of aggressor and victim transmitters. Other embodiments dynamically alter the relative timing of aggressor and victim transmitters.04-23-2009
20100054283METHOD OF TRANSFERRING TIMING INFORMATION OVER PACKET NETWORK - Timing information is transmitted over a network by sending time-stamped packets between a transmitter and receiver. The time-stamped packets are used to compute an estimate of the frequency deviation between the transmitter clock and the receiver clock. The local receiver clock is periodically updated to match the transmitter clock based on the estimate, which is preferably a least squares estimate. A multiple window approach is employed to increase update speed.03-04-2010
20090086766Method for transmitting synchronization messages in a communication network - There is described a method for transmitting synchronization messages in a communication network, the communication network comprising a plurality of network nodes communicating with one another, each containing an internal clock, which is timed with a node clock frequency assigned to the respective network node. The synchronization messages transmitted in the communication network serve to synchronize the times of the internal clocks of the network nodes and contain the pulse counter status of a synchronization clock operating at a predefined synchronization clock frequency. The pulse counter status is estimated by each network node and updated in the synchronization message. Changes in the synchronization clock frequency are taken into account when estimating the pulse counter status. Precise determination of the pulse counter status is achieved with the aid of an approximation of the change over time in the pulse ratio between synchronization clock frequency and node clock frequency by means of a function, with the result that the pulse ratio on transmission of a new synchronization message can be predicted and a precise current pulse counter status can be determined on the basis of the predicted pulse ratio. The method is particularly suitable for use in a communication network of an industrial automation system, whose components communicate with one another for example according to the Profinet standard.04-02-2009
20080310459Telecommunications control device autonomously determining transmission timing and a method therefor - A network node constituting a telecommunications system together with one or more neighboring nodes includes a telecommunications control device, which includes a timing control signal receiver for receiving timing control signals transmitted from the neighboring nodes, and a transmission timing calculator for determining data transmission timing of the network node, based on reception timing of the timing controls signal of the neighboring nodes. The device further includes a timing control signal transmitter for transmitting a timing control signal with a phase indicative of data transmission timing of the network node reflected, a data communicator for transmitting and receiving a data signal to and from the neighboring nodes, and a phase state manager for controlling transmission of the timing control signal and data signal in accordance with the phase state of the network node.12-18-2008
20100150180Algorithm for managing data loss in software demodulators - Embodiments of methods for receiving and processing multi-band signals in wideband and narrowband environments are described herein. Other embodiments may be described and claimed.06-17-2010
20100124240METHOD AND SYSTEM FOR NETWORK SYNCHRONIZATION - A method and a system for network synchronization are provided. In this method, when a node attempts to join a network, a parent node is searched from all other nodes already joined the network per specific time interval. If the parent node can be found, sync-information sent by the parent node is received by the node so as to synchronize with the parent node and enter a working mode. When a sleeping instruction sent by the parent node is received, or a timer determines that a network ending time is reached according to the sync-information, the node switches to a sleeping mode. However, when the timer determines that a network wakeup time is reached according to the sync-information, the node attempts to join the network again. All nodes in the network can work and sleep simultaneously so as to extend the lifetime of the battery.05-20-2010
20100085989Systems and methods for packet based timing offset determination using timing adjustment information - Systems and methods for performing timing offset and or fractional frequency offset for the purpose of time and/or frequency synchronization are provided. Timing packets are exchanged between a master device and a slave device. In addition, timing adjustment information is received by the slave device. The slave device uses the timing adjustment information in conjunction with the transmit and receive times for the timing packets to estimate at timing offset and/or fractional frequency offset.04-08-2010
20120033684TDMA COMMUNICATION USING A CSMA CHIPSET - A technique for communicating information using an electronic device that includes an IEEE 802.11-compliant chipset is described. This communication technique facilitates transmission of data packets in IEEE 802.11 frames in a communication channel by the IEEE 802.11-compliant chipset using time division multiple access (TDMA). In particular, the electronic device may queue a data packet in a software queue. Based on available space in a hardware queue in the IEEE 802.11-compliant chipset, this data packet may be provided to the hardware queue for inclusion in an IEEE 802.11 frame that is compliant with an IEEE 802.11 communication protocol. Then, the electronic device provides time-slot control information to the IEEE 802.11-compliant chipset based on a timing-synchronization signal. In this way, the electronic device gates the release of the data packet from the hardware queue for transmission in the IEEE 802.11 frame by the IEEE 802.11-compliant chipset.02-09-2012
20100080248TECHNIQUES FOR TIME TRANSFER VIA SIGNAL ENCODING - Techniques for time transfer via signal encoding are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for time transfer via signal encoding comprising generating a time service ordered-set for inclusion in a physical coding sublayer frame of a physical layer device, generating time service data for inclusion in the physical coding sublayer frame of the physical layer device, and transmitting the physical coding sublayer frame.04-01-2010
20100080249SYSTEM, METHOD AND APPARATUS OF TIME INFORMATION SYNCHRONIZATION - A system and a method of time information synchronization as well as related apparatuses are disclosed to improve precision of frequency synchronization or time synchronization. The application port subsystem in the information synchronization system is configured to: generate at least one local clock according to a locally running real-time clock, and provide the local clock for a core subsystem; and the core subsystem is configured to: select a best system clock according to attributes of the clock provided by the application port subsystem, and send the best system clock to the application port subsystem, where: the application port subsystem calibrates the real-time clock according to the best system clock provided by the core subsystem in order to perform frequency synchronization and/or time synchronization. The embodiments of the present invention improve the precision of frequency synchronization or time synchronization effectively.04-01-2010
20090168808APPARATUS AND METHOD FOR PERFORMING TIME SYNCHRONIZATION USING GPS INFORMATION IN COMMUNICATION SYSTEM - Disclosed is an apparatus and a method for performing time synchronization by using Global Positioning System (GPS) information in a communication system. The apparatus comprises a grand-master node having a GPS receiver, for generating a synchronizing message required to synchronize time on slave nodes by using Time Of Day (TOD) information received from the GPS receiver and at least one slave node for receiving the synchronizing message required to synchronize time from the grand-master node or from another slave node, for carrying out time synchronization operation by using an Offset and Frequency Compensation Clock (OFCC) synchronization process supporting time offset and frequency separation compensation, and for generating a synchronizing message required to synchronize time on other slave nodes.07-02-2009
20120106576Transparent Clock Adaptor for a Network Device - A transparent clock adaptor is provided for use with a router, switch or other network device that does not otherwise support transparent clock functionality. The transparent clock adaptor comprises a network port for coupling to a link of a network, a local port for coupling to a port of the network device, transparent clock processing circuitry operative to perform one or more transparent clock timing adjustment operations for each of a plurality of packets including at least one packet arriving in the adaptor via the network port and at least one packet arriving in the adaptor via the local port, and a synchronization interface for communicating with a corresponding synchronization interface of at least one other transparent clock adaptor. The adaptor can operate both as an ingress adaptor for packets arriving over the network link for delivery to the network device and as an egress adaptor for packets arriving from the network device for delivery over the network link.05-03-2012
20090168810SOURCE SYNCHRONOUS LINK WITH CLOCK RECOVERY AND BIT SKEW ALIGNMENT - A high speed transmission system transfers data streams over a plurality of data links. Each data link may carry a number of bit streams. On the transmitting end, multiplexers serialize the bit streams, which are then transmitted to the receiving end. A clock signal is not transmitted over the optical link. Instead, an indication of the appropriate clock signal frequency and phase is embedded in the transmitted data. At the receiving end, a clock recovery circuit generates a clock signal of an appropriate frequency and phase based on the embedded indication. The new clock signal is used to sample and reconstruct the original data streams.07-02-2009
20090262759COMMUNICATION - The present invention relates to communication, in particular to communication involving analogue-like signals that are multiplexed together. There is provided a method of communicating with a plurality of devices, each of which of which provides a signal whose amplitude varies in an analogue fashion, the method including the steps of: temporally interleaving the signals from the devices so as to form a multiplexed signal having a plurality of sequential pulses, which pulses can, in an analogue fashion, each have an amplitude within a continuous range, each pulse originating from a respective device, and each pulse having a plurality of temporal portions; and, forming a synchronisation signal within the multiplexed signal for demultiplexing the multiplexed signal, the synchronisation signal being formed by reducing the amplitude within a temporal portion of at least some of the pulses.10-22-2009
20090279572TRANSMISSION APPARATUS AND METHOD - A burst signal generator generates a burst signal that is a variable length portion whose length changes in accordance with fluctuations in data input at a predetermined period. An OFDM modulator generates an OFDM signal (including a guard interval portion and an effective symbol portion) that is a fixed length portion containing data corresponding to n (n is a positive integer) times or 1/n of the predetermined period. A frame includes the variable length portion and the fixed length portion. This makes a transmission signal actually have a frame period almost equal to the period of a signal synchronized with the clock of a player, including the fluctuations.11-12-2009
20090103571Under sampled clock signal synchronization aid device and device for reconstructing undersampled clock signals, for a packet-switched network - A synchronization aid device is part of receiving communication equipment of an IP network, having a primary clock signal consisting of primary clock pulses spaced apart by a first period. This device comprises i) a required to increment its value by one unit on each primary clock pulse and reset its value to zero each time it reaches a value M, ii) detection means required to generate a secondary clock pulse each time the value of the counter is zero, the secondary clock pulses forming a secondary clock signal having a second period equal to M times the first period, and iii) control means required, each time the receiving equipment receives a packet containing at least one first bit having a first value, to initialize the counter with a chosen value.04-23-2009
20090103570Time Synchronization in Serial Communications - A real-time clock (04-23-2009
20100111116DATA TRANSMISSION METHOD, SYSTEM AND TERMINAL - Embodiments of the present invention disclose a data transmission method, a data transmission system and a CLT. The method being applicable to a semi-duplex Ethernet Passive Coaxial-cable Network and the network comprising a CLT and at least one CNU; the CLT transmitting downlink data to each CNU in a preset downlink transmission period and each CNU transmitting uplink data to the CLT in a preset uplink transmission period; the preset uplink transmission period being shorter or equal to the period that clock synchronization can be kept by the CNU. The method includes: sending, by the CLT, clock information to the CNU before the expiration of the period that the clock synchronization can be kept by the CNU, the clock information being adapted to make the clocks of the CNU and CLT be kept synchronized with each other within a period. With the embodiments of the present invention, the clock between each CNU and the CLT can be kept synchronized. Thus, the normal communication between the CNU and the CLT is guaranteed.05-06-2010
20100111117TRANSFERRING DATA BETWEEN ASYNCHRONOUS CLOCK DOMAINS - A device comprises an integrated circuit having first and second domains, the first domain having a first clock boundary module; and the second domain having a second clock boundary module. The first clock boundary module comprises: a buffer, for storing data for transfer to the second domain; and a first controller operable to send a first control signal to the second clock boundary module via a first synchroniser, the first control signal indicating the presence of a packet of data in a first storage location of the buffer. One of the first and second clock boundary modules comprises a multiplexer having an input connected to an output of the buffer and an output connected to circuitry forming part of the second domain. The second clock boundary module comprises: a second controller, operable in response to receiving the first control signal to control transfer of said data from the buffer by the multiplexer, and to send a second control signal to the first controller via a second synchroniser, the second control signal indicating transfer of said data.05-06-2010
20100111115Node-to-node synchronizing apparatus, node-to-node synchronizing method, and computer product - A node-to-node synchronizing apparatus includes an information generating unit. Before receiving a synchronization request for synchronization, the information generating unit receives, from each process in each computing node, a mask generation request requesting to generate process location information (mask) indicating the location of processes that participate in synchronization. The information generating unit then automatically generates the process location information based on the mask generation request.05-06-2010
20100111114HIGH QUALITY TIMING DISTRIBUTION OVER DSL WITHOUT NTR SUPPORT - A method and system in which a Digital Subscriber Line Access Multiplexer (DSLAM) that is part of a DSL (Digital Subscriber Line) system is able to provide synchronous services to end user equipment connected to the DSLAM via a DSL link and Customer Premises Equipment (CPE). A sniffer device having direct or indirect access to a Primary Reference Clock (PRC) of the DSL system calculates the phase difference between the PRC and the DSLAM's Local Timing Reference (LTR). The phase difference is sent to the CPEs requiring accurate reference clock frequency. The CPEs are able to derive the PRC from the phase difference information transmitted by the sniffer device thus enabling synchronous end user equipment operation.05-06-2010
20110200060Feedforward Synchronization in Asynchronous Packet Networks - To perform timing synchronization in an asynchronous packet network, remote timestamps representative of a transmitter clock at a transmitter are received over a packet network. These are compared with local timestamps representative of the timing of a local oscillator at the receiver to produce an estimate of the offset between the transmitter clock and the local oscillator at the receiver. This estimate is then used to generate update values for a digital controlled oscillator producing the output clock at the receiver. The system operates in a feedforward configuration wherein the local oscillator at the receiver serves as one input to the offset estimator.08-18-2011
20080212619CLOCK SYNCHRONISATION OVER A PACKET NETWORK - A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces 09-04-2008
20080212616Services For Data Sharing And Synchronization - Systems and methods for sharing and synchronizing data using the addition of synchronization data to a feed that contains data items, and at least a node or endpoint that provides synchronization-related services to other endpoints, are disclosed. Such systems and methods, and client and service endpoints, may use the added synchronization data in multiple ways to share data, incorporate changes consistently, and resolve conflicts.09-04-2008
20100103955POWER MANAGEMENT OF A NETWORK DEVICE - In one embodiment, a method includes receiving a synchronization command to synchronize time information among each component of a set of components in a communication path. The method includes generating a power state message. The method includes transmitting the power state message, by the first component, to the remaining components in the communication path. The power state message is configured to reduce the power consumption of the remaining components of the set of components from a first power amount to a second power amount for a time period and the time period is associated with the synchronized time information.04-29-2010
20100103956Synchronised control method of a plurality of formatting equipment and stream formatting equipment - The present invention relates to the domain of control methods of a plurality of formatting equipment (FE04-29-2010
20090168809METHOD AND APPARATUS TO JOINTLY SYNCHRONIZE A LEGACY SDARS SIGNAL WITH OVERLAY MODULATION - Methods and apparatus are presented for the joint synchronization of legacy signals with overlay modulation signals in a communications system utilizing a hierarchical modulation scheme. In exemplary embodiments of the present invention, a synchronization signal can be sent in each of the legacy and overlay bit streams, each using a different approach to frame synchronization, and the two synchronization signals can be used in a complementary manner to synchronize both bit streams. In exemplary embodiments of the present invention a legacy physical frame and an overlay physical frame can be aligned in time. In exemplary embodiments of the present invention a key synchronization signal in a legacy bit stream can be time distributed throughout a legacy transmission frame and can be utilized to assist in both the synchronization of such legacy bit stream and of an overlay bit stream. Additionally, in exemplary embodiments of the present invention, a key synchronization signal in an overlay bit stream can be sent in one fixed physical frame of an overlay transmission frame, and can be utilized to assist in the synchronization of such overlay bit stream as well as legacy data, in a manner that complements the use of the synchronization signal provided in the legacy bit stream.07-02-2009
20090003388METHOD AND APPARATUS FOR SYNCHRONIZING PORTED NUMBER DATA - A method of synchronizing ported number data within a telecommunications network in which a number portability administration center has received a request from a subscriber having a directory number (DN) to port is provided. The method comprises the steps of: a Number Portability data manager sending a subscription request to the NPDB to receive future notifications about subscriber ports to/from specific Location Routing Number(s); the NPDB honoring these subscriptions when a user ports their DN. If this is the initial LRN assigned to the DN, then the NPDB derives the LRN of the code holder. If the LRN from which the subscriber ported has a subscription, then the NPDB sends a notification message to the NP data manager with which the LRN is associated indicating that the DN ported out. If the LRN to which the subscriber ported has a subscription, then the NPDB sends a notification message to the NP data manager with which the LRN is associated indicating that the DN ported in. The method further comprises receiving a notification message for the LRN at a number portability data manager, wherein: if the notification message indicates that a DN has ported in, then the number portability data manager sends a request to an ENUM (telephone number mapping) server to turn the entry for that DN on; and if the notification message indicates that a DN has ported out, then the number portability data manager sends requests to the ENUM server and to a subscriber database to turn the entry for that DN off.01-01-2009
20090003387Synchronization Between Connection Manager and Extension Components - This disclosure describes synchronization between a connection manager and extension components during terminal service starts, stops, and restarts. The synchronization occurs by application programming interfaces as mechanisms to notify extension components that a change of state is about to occur. The extension components take appropriate action steps, such as saving session information for a connection pertaining to a connection stop and restoring connection session information when the terminal service is restarted. Furthermore, the extension components may implement own caching mechanisms and selectively perform lazy restore on save data as necessary. As a result, experience for the user is enhanced by not losing any data when the terminal service is stopped and restarted. Also, administrators may perform a patch on terminal service binaries without waiting for all users to log off or without rebooting the system.01-01-2009
20080291944Method for Real-Time Synchronizing Configuration Data Between Element Management Systems and Network Elements - The present invention discloses a method for synchronizing the configuration data between an EMS and a NE, which includes: dividing the configuration data in the NE into several layers so that different configuration data layers include different minimum unit configuration data sets; setting a minimum unit identifier word for each configuration data layer to identify the configuration data changes of the configuration data layer; when the configuration data of the NE is changed, changing the corresponding identifier word and sending a configuration changed event notification to EMSs; after receiving the configuration changed event notification, the EMS synchronizes the configuration data according to the event notification. With the present invention, it is possible to make the EMS effectively monitor and synchronize configuration data with the NE in a real-time manner, so that network management efficiency can be improved.11-27-2008
20080285597SYNCHRONIZING SEPARATED EDGE QAM DEVICES LOCATED REMOTELY FROM A CMTS - The clocks of one or more edgeQAM devices are synchronized with a master clock at the remotely located CMTS. A master clock signal may be transmitted via a dedicated gigabit Ethernet link. Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators that drive local clocks at respective edgeQAM devices.11-20-2008
20080285596SYSTEM AND METHOD FOR FINE-GRAINED, END-TO-END TRAFFIC SCHEDULING ACROSS HETEROGENEOUS LOCAL AREA NETWORKS - A system and method for fine-grained, end-to-end traffic scheduling across heterogeneous local area networks (LANs). A system may include a network, where the network comprises multiple heterogeneous network, technologies. The system also may include at least two devices coupled to the network, where clocks of the at least two devices are synchronized. The system also may include a scheduler coupled to the network, where the scheduler creates a network wide data traffic schedule and where the data traffic schedule determines when each of the at least two devices can send data into the network. Other embodiments are described and claimed.11-20-2008
20080304521INTERNAL SIGNALING METHOD TO SUPPORT CLOCK SYNCHRONIZATION OF NODES CONNECTED VIA A WIRELESS LOCAL AREA NETWORK - This invention discloses a set of internal signaling (i.e., management primitives) to support a clock-synchronization protocol for wirelessly synchronizing clock registers of wired or wireless nodes via a wireless local area network (i.e., 802.11 network). The clock synchronization is performed between two higher-layer protocol entities residing within two different wireless stations (STAs).12-11-2008
20110013650PSEUDO-SYNCHRONOUS TIME DIVISION MULTIPLEXING - Methods and apparatuses to multiplex logic data pseudo synchronously are described. A representation of a multiplexer logic is generated to transmit data items asynchronously relative to a design clock. The data items may be transmitted under control of a transmission clock from a first integrated circuit to a second integrated circuit. A representation of a counter logic may be generated to couple with the multiplexer logic for transmitting the data asynchronously. Additionally, a representation of reset logic may be generated for a configuration to repeatedly reset the counter logic. Synchronization signals may be generated for a design clock cycle of a design clock driving the data items. The synchronization signals may be transmitted via the transmission clock asynchronous with the design clock. The data items may be transmitted via a number of transmission slots determined based on the clock cycles of the transmission clock and the design clock The total time for the transmission slots for transmitting the logic data may be less than the clock cycle of the design clock. One or more transmission slots within the clock cycle of the design clock may be used to transmit the synchronization data to indicate a new cycle to transmit the data items according to the design clock.01-20-2011
20080279225Synchronized Receiver - There is provided a method of operating a communications system comprising a transmitting station and a receiving station, the method in the transmitting station comprising encoding a clock signal with data to form encoded signals for transmission; transmitting the encoded signals to the receiving station; the method in the receiving station comprising decoding the encoded signals to extract the clock signal and data; processing the data under the control of the decoded clock signal. The method further comprises, when no data is required to be transmitted to the receiving station, transmitting further encoded signals to the receiving station in order for the receiving station to decode the further encoded signals and extract a clock signal.11-13-2008
20130215910TRANSMISSION APPARATUS, TRANSMISSION METHOD, PROGRAM, AND COMMUNICATION SYSTEM - A transmission apparatus transmits a timestamp in increments of 1008-22-2013
20080240164METHOD FOR DATA CONVERTER SAMPLE CLOCK DISTRIBUTION - A unit for use in a communication system comprises a communication module having an oscillator configured to generate a master clock signal; a plurality of conversion modules; and a distribution component configured to distribute the master clock signal from the communication module to each of the plurality of conversion modules. Each of the plurality of conversion modules comprises a filter configured to filter the master clock signal; and a converter configured to use the filtered master clock signal in converting between analog and digital signals.10-02-2008
20080240165METHOD AND SYSTEM FOR SYNCHRONIZATION OF CONTENT RENDERING - A method and system for synchronizing the rendering of content at various rendering devices. Each rendering device has a device time and a rendering time. The synchronization system designates one of the rendering devices as a master rendering device and designates all other rendering devices as slave rendering devices. Each slave rendering device adjusts the rendering of its content to keep it in synchronization with the rendering of the content at the master rendering device. The master rendering device sends a message with its rendering time and corresponding device time to the slave rendering devices. Each slave rendering device, upon receiving the message from the master rendering device, determines whether it is synchronized with the master rendering time. If not, the slave rendering device adjusts the rendering of its content to compensate for the difference between the master rendering time and the slave rendering time.10-02-2008
20080240163System and method for maintaining transmission synchrony - Method for maintaining transmission synchrony in wireless communications networks. An embodiment includes computing a transmission time for a packet, adding an adjustment to the transmission time in response to a determining that clock drift has occurred between a local clock and a clock of a host device, and scheduling the packet for transmission at the transmission time. The adjustment is based on timing information provided by control instructions transmitted by the host device. The adjustment is computed using timing information from consecutively received control instructions and a single clock contained in a wireless device. If clock drift has occurred, then the timing information will differ significantly for the two control instructions. The ability to perform the clock drift calculation using a single clock may help to keep the cost and power consumption of the wireless device as low as possible.10-02-2008
20090180497Communication Device and Method for Data Transmission - Disclosed is a method and device for transmitting data between at least two transmitters and a receiver which are connected to a bus. A synchronization signal is applied to the bus and a number of data volume counters corresponding to the number of transmitters reduced by one is set to a predefined initial value. A first transmitter transmits in the form of data elements a predefined data volume allocated to the transmitter over the bus to the receiver. The data volume values of the other transmitters are selected so that only one transmitter at any given time simultaneously transmits on the bus.07-16-2009
20080317068SERVER-ASSISTED AND PEER-TO-PEER SYNCHRONIZATION - Systems and methods for synchronizing data between endpoints using elements of centralized and decentralized synchronization systems and communication topologies are disclosed. Such systems and methods may in some cases synchronize some subset of data with a centralized endpoint while another subset of data is synchronized in a decentralized fashion directly with other endpoints. Such systems and methods may include a variety of cooperative functionality to assist in the synchronization of data between endpoints.12-25-2008
20090141745NETWORK APPARATUS AND NETWORK SIGNAL PROCESSING METHOD - A network apparatus, for processing a network signal and outputting an output signal, includes an asynchronous signal processing module, a sampling rate converter and a synchronous signal processing module. The asynchronous signal processing module operates in an asynchronous domain, and is utilized for receiving and processing the network signal to generate a first processed signal. The sampling rate converter is coupled to the asynchronous signal processing module, and is utilized for performing sampling rate conversion on the first processed signal to generate the output signal. A first operating frequency of the asynchronous signal processing module is different from a second operating frequency of the synchronous signal processing module.06-04-2009
20090141743Advanced clock distribution mechanism for circuit emulation applications - A clock distribution mechanism for circuit emulation applications, and related method, including one or more of the following: a plurality of digitally controlled oscillators, each of the plurality of digitally controlled oscillators receiving one or more Ethernet packets and generating a recovered clock from the one or more Ethernet packets; a multiplexer for receiving the recovered clocks generated by the plurality of digitally controlled oscillators, selecting a one of the recovered clocks generated by the plurality of digitally controlled oscillators, and outputting the selected one of the recovered clocks; a normalizer that receives a frequency of the selected one of the recovered clocks and generates a normalized frequency output based on the received frequency of the selected one of the recovered clocks and outputs the normalized frequency output; a clock source selector for receiving a plurality of input clock sources, one of the input clock sources being the normalized frequency output of the normalizer, the clock source selector selecting the normalized frequency output from among the plurality of input clock sources and transmitting the selected normalized frequency to a node; and one or more nodes for receiving the selected normalized frequency.06-04-2009
20110222561SYSTEMS AND METHODS FOR PROVIDING TIME SYNCHRONIZATION - Systems and methods for providing time synchronization in a local network are provided. A time source may be configured to determine a current time and a designated time at which a reference signal will be output, and to output the reference signal when the designated time is reached. A network host communicatively coupled to the time source may be configured to (i) identify the designated time and (ii) communicate the identified designated time to one or more network devices via a local network. The one or more network devices may be respectively configured to (i) initiate an internal clock, (ii) receive the designated time from the network host, (iii) receive the reference signal output be the time source subsequent to receiving the designated time, and (iv) set a value of the internal clock to the designated time upon receipt of the reference signal.09-15-2011
20090052474SELECTIVE BUILD FABRIC (BF) AND RECONFIGURE FABRIC (RCF) FLOODING - In one embodiment, detecting an initialization of a synchronization phase of a network device in a fiber channel fabric, performing synchronization phase optimization of the network device to select a predetermined number of interfaces, and transmitting a synchronization request on the predetermined number of interfaces, are provided.02-26-2009
20110142079NETWORK IMPAIRMENT METRICS FOR TIMING OVER PACKET - The invention is directed to providing a system and method for monitoring a clock synchronization metric in a timing-over-packet system to provide a metric for service-level agreements (SLA), by providing a measure of the stability of the packet transfer delay relative to a representative statistic such as a median or minimum.06-16-2011
20110142078NETWORK TIMING TOPOLOGY VIA NETWORK MANAGER - The invention is directed to providing a method and system for monitoring and managing from a network management entity, timing-over-packet synchronization performance in a packet switching network having multiple network nodes. The network management entity determines a physical topology and a synchronization topology of the network and monitors synchronization performance by collecting virtual path information.06-16-2011
20110142077NETWORK SYNC PLANNING AND FAILURE SIMULATIONS - The invention is directed to a method and system for providing synchronization clock performance simulation in a timing-over-packet network having a network management system. The system retrieves information from nodes in a network and determines a timing-over-packet topology in a simulated model of the network, and determines clock stability statistics. The system further accepts simulation inputs such as addition or deletion of nodes in the simulated network, or introduction of failures into in the simulated network. The system provides predicted clock stability performance of an existing network under various simulated conditions without requiring modifications or introduction of failures to the existing network which would be useful for network optimization and network planning.06-16-2011
20130121351FRAME TRANSMISSION DEVICE AND SYNCHRONIZATION METHOD - A frame transmission device includes: a clock section; a path control section to switch a plurality of transmission paths for exchanging a time synchronization frame with a node device that measures a reference time; a fluctuation estimation section to set a fluctuation estimate of a transmission delay of the time synchronization frame on each of the plurality of transmission paths; and a time synchronization section to synchronize the clock section to the reference time in accordance with a time synchronization frame exchanged on a selected transmission path selected from among the plurality of transmission paths based on the fluctuation estimate.05-16-2013
20130121352METHOD AND DEVICE FOR TIME SYNCHRONIZATION - A method and a device for time synchronization are disclosed according to the embodiments of the present invention. The method includes: selecting, by a slave device, a port of a single-fiber bi-directional line as a synchronization port of a 1588 clock protocol; specifying a work mode of the synchronization port; exchanging a 1588 clock synchronization packet with a master device through the synchronization port according to the work mode; acquiring transmission time information and restore a system clock according to the 1588 clock synchronization packet; and adjusting the system clock according to the work mode and the transmission time information. The device includes: a line processing module, a clock recovery module and a clock adjustment module. Through the method and the device, zero-error time synchronization is implemented; and in the case of unfixed path delay, the time synchronization can also be implemented.05-16-2013
20090086764System and method for time synchronization on network - A system and method for time synchronization on a network is provided. According to the system and method for time synchronization, a slave clock device does not continuously receive a time synchronization message periodically transferred from a master clock device and thus does not correct its time upon all such occasions. Rather, the slave clock device requests time information from the master clock device only when the slave clock device needs to correct its time, and receives a time synchronization message transferred from the master clock device and compensates for its time deviation only while the slave clock device is activated, thereby reducing its power consumption and amount of computation.04-02-2009
20090097505Multiplexing Network System And Digital Information Transferring Method - In a multiplexing network system in which media devices are interconnected through a digital transmission path, during system startup, a device that is used as a master device holds management information for recognizing bands used by media devices connected to the digital transmission path and management information for recognizing what type of data is output/received between the media devices. During the system startup, the master device refers to the management information to set the compression rates of data streams transferred between the media devices to be variable.04-16-2009
20090207865TIME SYNCHRONIZATION IN A NETWORK - A method and corresponding system for communicating between stations in a network is presented. The method includes providing repeated beacon transmissions from a coordinator station for coordinating transmissions among the stations; transmitting a signal from a first station and receiving the signal at a second station; and performing one or both of: generating the signal based on a local clock at the first station and time adjustment information in a beacon transmission received by the first station, and sampling the signal at sample times based on a local clock at the second station and time adjustment information in a beacon transmission received by the second station.08-20-2009
20090257457METHOD AND SYSTEM FOR MAC AND PHY SYNCHRONIZATION FOR ENERGY EFFICIENT NETWORKING - Aspects of a method and system for MAC and PHY synchronization for energy efficient networking are provided. In this regard, an interface that enables communication between a MAC controller and a PHY device may be configured to operate in an energy saving mode. While the interface is operating in an energy saving mode, synchronization between the MAC controller and the PHY device may be maintained by one or both of adjusting a clock generated for the interface and/or communicating dummy data via the interface. The clock may be adjusted by one or more of adjusting a frequency of the clock, adjusting an amplitude of the clock, and/or duty cycling the clock. The MAC controller and/or the PHY device may generate the dummy data. The PHY device and/or the MAC controller may discard the dummy data upon receiving the dummy data.10-15-2009
20090245291SYSTEM AND METHOD FOR COMMUNICATING TIMING TO A REMOTE NODE - A system and method for synchronizing a clock for data transmissions. A data packet is received at a remote node. A timing characteristic of the data packet corresponds to a tick of a clock form a reference clock. A tick of the clock is determined based on the timing characteristic of the data packet. A secondary clock is disciplined with the reference clock by adjusting the secondary clock based on a difference between times measured by the reference clock and the secondary clock to generate a clock signal. The clock signal is communicated to one or more interfaces.10-01-2009
20090257455Method and apparatus for synchronizing timing of signal packets - In some communications systems, unsynchronized near-end and far-end packets of communications signals can reduce or impair performance of processing of packets, such as to the case of Coded Domain Media Quality Enhancement. Therefore, a system may synchronize the incoming signals to enhance quality. A relative delay determination module according to an example embodiment of this invention determines a synchronization and relative delay between packets belonging to different packet streams arriving at a network node in a packet-based network by computing a time synchronization parameter based on a time reference of timestamps of the signals and reports the relative delay to a module making use of the relative delay such as a voice quality enhancement or an echo control module. By synchronizing the packets at the location within the network, source clocks at end or edge nodes of the network can operate with reduced synchronization, simplifying network operations and management thereof.10-15-2009
20090257458CLOCK SYNCHRONIZATION SYSTEM - A clock synchronization system includes a master node; a PSN (Packet Switched Network); and a slave node configured to synchronize a recovery clock signal in the slave node with a clock signal in the master node by using packets periodically received from the master node through the PSN. The slave node includes: a buffer section having a buffer and configured to temporarily store the packets received from the master node in the buffer, to monitor and output a buffer accumulation amount, and to output data of the packets from the buffer in response to the recovery clock signal; a maximum extracting section configured to receive the buffer accumulation amount from the buffer and to extract a maximum value for each time period from the buffer accumulation amount; a control section configured to generate a control voltage such that the maximum values from the maximum extracting section are held at a reference value; and a VCO (Voltage Controlled Oscillator) configured to adjust a frequency of the recovery clock signal based on the control voltage from the control section.10-15-2009
20090257456COORDINATED TIMING NETWORK HAVING SERVERS OF DIFFERENT CAPABILITIES - Communication and processing within a timing network that supports servers having different capabilities are facilitated. Individual servers of the network are dynamically updated without disrupting the operational characteristics of the timing network. New capabilities are not utilized between two servers until it is known that both servers are capable of supporting the new features. One server communicates to another server at an acceptable level of the another server.10-15-2009
20100158051Method, Apparatus and System for Frequency Synchronization Between Devices Communicating over a Packet Network - An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop utilizes a frequency error estimator implemented as a maximum-likelihood estimator with slope fitting based on a sequence of arrival timestamps, and a loop filter implemented as a series combination of an adaptive-bandwidth filter and a proportional-integral controller. The clock recovery module may further comprise a discontinuity detector configured to detect a discontinuity in delays of respective timing messages, and a loop controller operative to place the clock recovery loop in a particular state responsive to detection of the discontinuity.06-24-2010
20090122813METHOD, SYSTEM AND APPARATUS FOR TIME SYNCHRONIZATION - A method for time synchronization that includes sending, by a master node, synchronization time information to a slave node through a section overhead, adjusting, by the slave node, a time of the slave node to achieve time synchronization according to the synchronization time information carried in the received section overhead. A system, a master node, and a slave node for time synchronization are also provided. With the disclosure, the synchronization time information is not affected by tributary pointer adjustment and no phase transient occurs when the coding signal of the synchronization time information is transmitted. As a result, the precision of time synchronization is improved.05-14-2009
20100150181APPARTUS FOR RECEIVING T-DMB SIGNAL AND METHOD OF OPERATING THE SAME - There is provided an apparatus for receiving a T-DMB signal. The apparatus for receiving a T-DMB signal comprises an input buffer receiving and buffering a T-DMB signal comprising a null symbol and a phase reference symbol (PRS); an initial synchronizing unit estimating and compensating for time and frequency offsets of the T-DMB signal using the null symbol and the PRS; a frame tracking unit performing estimation of the time offset and measurement of a strength of an output signal from the input buffer; an OFDM signal demodulating unit performing I/Q demodulation, frequency compensation, OFDM demodulation and de-interleaving with respect to an output signal of the frame tracking unit; a channel decoding unit performing channel decoding with respect to an output signal of the OFDM signal demodulating unit and checking quality of the channel-decoded signal; and a controller controlling operations of the initial synchronizing unit, the OFDM signal demodulating unit and the channel decoding unit 06-17-2010
20100158052ELECTRONIC DEVICE AND METHOD FOR SYNCHRONIZING A COMMUNICATION - An electronic device is provided which comprises a plurality of processing units (IP06-24-2010
20120140781DYNAMIC HOST CLOCK COMPENSATION - In accordance with a first embodiment of the present invention, a method for improving synchronization of communications between a first port and a second port is provided, the method performed at the first port and comprising: inserting skip symbols into a transmission stream for transmissions from the first port to the second port, wherein the skip symbols are inserted at a first average frequency level; detecting a lack of synchronization between the first port and the second port; and inserting skip symbols into the transmission stream at a second average frequency level greater than the first average frequency level in response to the detecting.06-07-2012
20100166023PCR Clock Recovery in an IP Network - An IP network includes a central entity and at least one customer premises equipment (CPE) device. The central entity generates a program clock reference (PCR) clock and provides audio-visual packets to a CPE based on the PCR clock. The CPE sets a first clock based on the PCR clock for decoding operations. The CPE sets a second clock that is independent from the first clock for audio and video output operations. For example, the CPE can process the audio-visual packets using the second clock.07-01-2010
20100183036METHOD AND ARRANGEMENT FOR ADJUSTMENT OF A CLOCK SIGNAL - An arrangement for adjusting a clock signal in a network element of a communications network includes a processor device arranged to produce a control variable containing information about synchronization messages received from at least two other network elements. A situation in which the reception from a sending network element of synchronization messages of a good enough quality ceases will not significantly disturb the clock signal to be adjusted because only part of the control variable used for the adjustment depends on synchronization messages sent by an individual network element. In a preferred arrangement, the reference value of the control variable is changed in response to a situation where the reception from a sending network element of synchronization messages of a good enough quality ceases. Thus it is possible to reduce the change of the difference between the control variable and its reference value which further reduces disturbances caused in the clock signal to be adjusted.07-22-2010
20100183035METHOD, DEVICE AND SYSTEM FOR MANAGING TIMESTAMP - In an embodiment of the present disclosure, a method of managing IEEE1588 timestamps is disclosed. The method includes: receiving a data frame and a storage address of synchronized timestamp controlling information; obtaining the timestamp controlling information for the data frame to control the timestamp processing according to the storage address; obtaining a timestamp while receiving the data frame, obtaining a required timestamp according to the timestamp and adding the required timestamp into the data frame according to the timestamp controlling information; and sending the data frame added with the timestamp. A downstream timestamp managing module, an upstream timestamp managing module, and relevant timestamp managing systems are also disclosed in an embodiment of the present disclosure. The embodiment can conveniently and accurately add or obtain IEEE1588 timestamp into or from 10 Gbit/s Ethernet and simultaneously save resources and guarantee the synchronization of timestamp and data.07-22-2010
20100260208System and Method for Frame Synchronization - A system and method for calculating and applying a metric that is calculated over a binary interval that corresponds in length to a preamble. The value of the metric reflects the likelihood that the interval is the preamble. A lower value for the metric suggests that the interval is more likely to be the preamble. In an embodiment, the metric is calculated beginning at an initial location in the bitstream, and then recalculated beginning at each of several successive locations in the bitstream. This results in a set of calculated metrics. The start of the preamble is considered likely to be the initial location of the interval that corresponds to the metric having the lowest value.10-14-2010
20100166021SUBSCRIBER LINE INTERFACE CIRCUITRY WITH INTEGRATED SERIAL INTERFACES - Methods and apparatus for synchronizing communications between a first and a second device include serially communicating a frame having a first format from a first device to a second device, wherein only a frame synchronization timeslot (F1) is asserted. The serially communicated frame having the first format is sampled by the second device until the asserted F1 timeslot is detected. The second device serially communicates a frame having a second format to the first device, wherein only a frame synchronization timeslot (R1) is asserted. The serially communicated frame having the second format is sampled by the first device until the asserted R1 timeslot is detected. The first device establishes synchronization when these steps are successfully repeated. On the second sampling to detect the F1 timeslot, however, the sampling is windowed to less than one timeslot within the expected occurrence of the F1 timeslot.07-01-2010
20100177790TIMING RECOVERY CIRCUIT, COMMUNICATION NODE, NETWORK SYSTEM, AND ELECTRONIC DEVICE - A comparison period determiner (07-15-2010
20130215911MULTI-INTERFACE COMPATIBLE BUS OVER A COMMON PHYSICAL CONNECTION - A multi-interface bus allows for different bus standards to be implemented over the same set of physical bus lines. More particularly, in one implementation, the system includes a first circuit board, a second circuit board, and a bus connecting the first and second circuit boards. The second circuit board is configured to communicate with the first circuit board using either a synchronous or an asynchronous bus protocol determined based on a bus protocol used by the first circuit board.08-22-2013
20100220749METHOD AND ARRANGEMENT FOR LOCAL SYCHRONIZATION IN MASTER-SLAVE DISTRIBUTED COMMUNICATION SYSTEMS - A communication system which consists of several modules—operating in parallel on segments of a packet—to increase speed and handling capacity. One module acts as master, the others are slave modules controlled by control signals derived by the master module. It is important that in each module the data segment and the respective control signal of each packet are correctly synchronized, because in large systems the data paths carrying packet segments and the control signal paths may have substantially different delays. The invention provides for measurement of the propagation delay differences and for introducing a controlled delay in each slave module, so that data segments and control signals can be correctly correlated by delaying either the one or the other. Synchronization packets are transmitted besides normal data packets, for obtaining time stamps which are used to determine the delay difference.09-02-2010
20100238956Methods and systems for distributed synchronization - The invention provides a set of methods and systems for obtaining a synchronized signal in a distributed fashion. The methods and systems described herein allow a node to obtain a periodic signal that would be synchronized with the periodic signal obtained at another node when both nodes follow the same synchronizing procedure, without the need for centralized control of both nodes or the need for all nodes to have coordinated local oscillators. The invention includes beamforming methods and systems for producing a coherent beam at a target location and at a target frequency using the synchronized signal.09-23-2010
20100220748SLAVE DEVICE, TIME SYNCHRONIZATION METHOD IN SLAVE DEVICE, MASTER DEVICE, AND ELECTRONIC EQUIPMENT SYSTEM - A slave device includes: a clock unit that is configured by a counter so as to output time information; a clock generation unit that generates clocks for counting up the counter; a message receiving unit that receives messages sent from a master device; a message sending unit that sends messages to the master device; a first calculation unit that calculates a first value necessary for correcting the time on the clock unit; a first correction unit that corrects the time on the clock unit based on the first value calculated by the first calculation unit; a second calculation unit that calculates a second value necessary for correcting a frequency of the clocks generated by the clock generation unit; and a second correction unit that corrects the frequency of the clocks generated by the clock generation unit based on the second value calculated by the second calculation unit.09-02-2010
20100265968Synchronization Time Difference measurements in OFDM Systems - Disclosed herein are methods and devices for determining a received time difference between a first OFDM signal received from a first base station and a second OFDM signal received from a second base station. The methods and apparatus disclosed herein may be applied to 3GPP LTE systems as well as other OFDM-based wireless communication systems. An exemplary method comprises determining a decoding synchronization time for each of the first and second OFDM signals and calculating a time difference between the respective decoding synchronization times. The calculated time difference is transmitted by the mobile terminal to the first base station, the second base station, or both. Methods and apparatus for processing, at a base station, time difference information calculated according to the methods herein and transmitted to the base station by a mobile terminal are also presented.10-21-2010
20130128903PACKET-BASED TIMING MEASUREMENT - A slave communication device may transmit a packet to the master communication device, with the packet including a transmission time field and a correction field. The transmission time field may contain a value indicative of an approximate time of transmission of the packet by the slave communication device, and the correction field may contain a value indicative of a difference between the approximate time of transmission and an actual time of transmission of the packet by the slave communication device.05-23-2013
20080279224Alignment and Deskew For Multiple Lanes of Serical Interconnect - Methods and apparatus are provided for data communication between a transmitter and receiver over a plurality of serial links, which cause the transmitter to send serialized groups of bits down each lane, in such a way that the first bit of each group (each lane) is guaranteed to arrive in the correct order at the receiving end. Various embodiments of the present invention include declaring a budget for the maximum skew between lanes. In such embodiments, subsequent to determining the skew budget between lanes, the data to be transmitted is divided into groups of N bits, where N is any convenient number larger than M times S, with M being the number of lanes and S being the budgeted skew, in bit times.11-13-2008
20100296523TELECOM MULTIPLEXER FOR VARIABLE RATE COMPOSITE BIT STREAM - A multiplexer/demultiplexer (MUX/DEMUX) system for multiplexing and demultiplexing information from a plurality of traffic channels is configured according to a Plesiochronous Digital Hierarchy (PDH) standard into a composite signal transferred to and from a telecommunciations interface. A PDH traffic interface receives PDH channel signals from a plurality of PDH channels and a bit-pipe interface receives bit-pipe traffic transported as a packet data stream. A composite signal generation module and interface then creates, outputs and receives a single composite serial data stream including, in a single composite format, information from the received PDH channel signals as well as the packet data stream. The rate of the bit-pipe traffic may be adaptively modulated as a function of the composite rate.11-25-2010
20100303100Method and System for Synchronizing a Group of End-Terminals - A method is described for synchronizing the transmission of a stream to a group of end-terminals. The method is used in a system comprising a station transmitting a packetized stream over a network to at least a first and second network node. Each network node comprises a variable delay unit and each network node is connected to one or more end-terminals. In the method the synchronization unit receives arrival time information of a packet in the broadcast stream at the first and second network node. Delay information is calculated for the first and second network node on the basis of the arrival time information of the packet. Further, the delay information is transmitted to the first and second network node so that the variable delay unit in the first and second network node is able to transmit the broadcast stream to the first and second end-terminal in a substantially synchronized way.12-02-2010
20090067452SYNCHRONIZATION USING MULTICASTING - A process to synchronize information transmitted from an information provider to a plurality of network elements is provided. The process determines a temporal difference between related network elements and compensates for this difference by dilating an information signal provided to at least one of the network elements to resynchronize the data presented to the network elements. The process is repeated periodically in order to maintain a desired synchronization level.03-12-2009
20120243559Synchronization, Re-Synchronization, Addressing, and Serialized Signal Processing for Daisy-Chained Communication Devices - Techniques for use in a data communication system having a number of communicatively coupled device include techniques for synchronization and re-synchronization of frame and bit clocks, techniques for assigning device address, techniques for dynamically controlling transmit power based on the number of devices, and techniques for serialized signal processing.09-27-2012
20090245290EFFICIENT SYNCHRONIZATION OF A SLIDING BUFFER WINDOW TO PREVENT PACKET RE-INJECTION IN AN INTERNET PROTOCOL (IP) NETWORK - An apparatus, system, and method are disclosed for efficient synchronization of a sliding buffer window to prevent packet re-injection in an IP network. The steps of the method include receiving a data packet which comprises a packet sequence number. The method initializes a replay counter, an update counter, and a circular buffer window. The circular buffer window may comprise at least one window bank and the circular buffer window may also comprise a current window bank. Furthermore, the method may include determining that the packet sequence number is greater than a maximum current bank value. In response, the method may define shifting the circular buffer window such that a current window bank position is incremented. The method may then include determining that the packet sequence number is inside the current window bank and accepting the data packet. Furthermore, a Double Compare and Swap (DCS) operation may update the bit indicator and increment the update counter and replay counter. Also, a Compare and Swap and Store (CSST) operation may increment the update counter and replay counter and set a shifted window bank. Therefore, DCS and CSST operation may still be used without having to resort to traditional locks with higher overhead. In addition, the buffer window may be an arbitrary size and is not limited to the machine architecture limit for compare and swap operations.10-01-2009
20110142080METHOD AND SYSTEM FOR ENERGY EFFICIENT SYNCHRONIZATION IN PACKET BASED NETWORKS - Aspects of a method and system for energy efficiency synchronization packet based networks are provided. In this regard, an amount that a clock of a network device drifts between consecutive communications of one or more synchronization packets may be determined, and transitions of the network device into and/or out-of an energy-saving mode of operation may be controlled based on the determination. Additionally or alternatively, the transitions may be controlled based on a number of times that synchronization packets are communicated between the network device and a link partner. An average difference between the clock of the network device and a reference clock may be calculated, and the transitions may be controlled based on the calculated average.06-16-2011
20100183034SYNCHRONIZATION OF MULTI-TIME BASE DATA SOURCES - Systems and methods are described herein that cause data from asynchronous data sources to be provided with a timestamp that corresponds to a common time base. A trigger board can be used to control synchronized data sources, and can generate timestamps when data is collected by the synchronized data sources. Unsynchronized data sources can generate data independent of the trigger board. System timestamps are generated each time data from the synchronized data source and the unsynchronized data source is received. Values of the system timestamp can be modified, and can be replaced by timestamps that correspond to the time base used by the trigger board.07-22-2010
20090316728METHOD AND APPARATUS TO ENCODE AND SYNCHRONIZE A SERIAL INTERFACE - The present disclosure is generally directed to a method and apparatus to communicate data between two or more semiconductor devices. In an embodiment, a method includes synchronizing a master device with a slave device, where the master device includes a semiconductor device. Synchronizing includes transmitting a first synchronization marker data pattern via a first serial interface from the master device at a first time, and receiving a second synchronization marker data pattern via a second serial interface at the master device at a second time in response to transmitting the first synchronization marker data pattern. Synchronizing also includes determining, based at least in part on the first time and the second time, a third time when a reply is to be received by the master device in response to a request transmitted from the master device to the slave device.12-24-2009
20100054282METHOD AND DATA TRANSMISSION SYSTEM FOR TRANSFERRING DATA BETWEEN THE DATA TRANSMISSION SYSTEM AND A HOST PROCESSOR OF A PARTICIPANT IN A DATA TRANSMISSION SYSTEM - A method is for transferring data between a data transmission system and a processor of a participant in the data transmission system. All components of the data transmission system are synchronized to a common global time base. The operating-system time base of the participant processor is synchronized to the global time base of the data transmission system. To render possible a synchronization of the operating-system time base to the global time base in complex data transmission systems as well, it is provided that the operating-system time base of the participant processor be synchronized to the global time base of the data transmission system at least prior to a data transfer, and, to this end, that a synchronization clock pulse that is synchronous to the global time base of the data transmission system be provided for synchronizing the operating-system time base. This synchronization clock pulse is provided by a suitable arrangement that is implemented as hardware and/or software. In a data transmission system for implementing the method, the synchronization clock pulse is provided by suitable arrangement(s) of the communications controller and applied to the host processor via a synchronization line.03-04-2010
20100061405SYSTEM AND METHOD FOR MONITORING SYNCHRONIZATION - A method of operating a system of devices comprises receiving content to be rendered, receiving augmentation data for controlling one or more effects devices, rendering the content at a first device, controlling the or each effects devices according to the augmentation data in synchronization with the content rendering, monitoring the synchronization of the augmentation data, and adjusting the controlling of one or more effects devices if the synchronization of the augmentation data is determined to be in doubt.03-11-2010
20100135336METHOD, APPARATUS, AND SYSTEM FOR SYNCHRONIZING TIME - The present invention discloses a method, an apparatus, and a system for synchronizing time, and relates to communication technologies. The method includes: receiving a time synchronization signal which includes a One Pulse Per Second (1PPS) and an absolute time data; and sending the time synchronization signals to the client through a wired medium to synchronize time. The apparatus includes a receiving module and a sending module. The system includes a time synchronization apparatus and a client. Time synchronization is implemented through an existing wired medium between base stations to accomplish μs-level time synchronization between indoor base stations without extra cabling.06-03-2010
20100135333PRECESION/SPEED COMPROMISE OF A SYNCHRONIZATION SIGNAL RECEPTION DEVICE - The present invention relates to a reception device able to receive packets in a communication network comprising at least two stations. The device comprises means for: 06-03-2010
20100135332METHOD FOR SYNCHRONIZING A CLOCK OF A NETWORK COMPONENT WITH A CLOCK OF FURTHER NETWORK COMPONENT AND NETWORK COMPONENT THEFOR - The invention relates to a method for synchronizing a clock of a network component with a clock of a further network component communicatively connected to the network component in a network and a network component, whereby the method comprises the following steps: determining a set of forward transition delays for transmission of messages from the network component to the further network component and a set of corresponding backward transition delays for transmission of messages from the further network component to the network component, selecting a minimum forward transition delay from the set of forward transition delays, selecting a minimum backward transition delay from the set of backward transition delays, deriving an estimated value for an offset between the clock of the network component and the clock of the further network component from the selected minimum forward transition delay and minimum backward transition delay, and adjusting the clock of the network component in accordance with the estimated value for the offset estimate.06-03-2010
20100135331SYSTEM AND METHOD FOR SYNCHRONIZING COMMUNICATING ENTITIES IN A DECENTRALIZED NETWORK - A method for synchronizing communicating entities in a decentralized network. The method begins with a recipient entity receiving data comprising a first timestamp and a first distance. The first timestamp being the time the first data was broadcast; the first distance being a distance from the sender's synchronization time. Next the recipient entity receives data comprising a second timestamp and a second distance. The second timestamp being the time the second data was broadcast; the second distance being a distance from the sender's synchronization time. Based on the first and second timestamps and distances, the recipient entity calculates a new synchronization time. Next, the recipient entity broadcasts to at least one entity in the decentralized network data comprising a third timestamp and a third distance. The third timestamp being the time the third data was broadcast; the third distance being a distance from the recipient entity's synchronization time.06-03-2010
20090028191METHOD FOR EXCHANGING DATA BETWEEN STATIONS FROM DIFFERENT NETWORKS - The invention relates to a method for exchanging data between stations or nodes (01-29-2009
20110075685METHOD, APPARATUS, AND SYSTEM FOR TIME SYNCHRONIZATION - A method, apparatus, and system for time synchronization are disclosed. The method comprising: obtaining a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp; and adjusting the time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock. With the present invention, in passband transmission systems that transmit signals continuously in units of symbols, the time synchronization is implemented between the master clock and the slave clock.03-31-2011
20110150008AUTOMATIC MANAGEMENT OF TIMESTAMP-BASED SYNCHRONISATION PROTOCOLS - A method for automatic management of a timestamp-based synchronization protocol within a packet-based network to synchronize a slave within a synchronization topology including a plurality of masters, the slave clock being locked to a master clock at an initialization time, said method comprising an assessment step of end-to-end packet delay variation on the basis of the slave clock accuracy, over a plurality of (slave, path, master) combinations, each path linking the slave to a master.06-23-2011
20110150007CLOCK OPERATING METHOD AND APPARATUS FOR SUPPORTING ETHERNET PHYSICAL LAYER INTERFACES - Provided is a clock operating method and apparatus for supporting a plurality of Ethernet physical layer interfaces. To provide a network synchronization function in a board of simultaneously accommodating the plurality of Ethernet physical layer interfaces, the clock operating method may include: determining a physical layer interface according to a current network synchronization mode; and generating a clock signal of the determined physical layer interface as a reference signal of another physical layer interface.06-23-2011
20110150005Network Slave Node and Time Synchronization Method in Network Applying the Same - Provided are a network slave node and a time synchronization method using precision time protocol-like (PTP-like) in a network. The network slave node includes a packet detection unit for detecting whether the slave node receives or sends a synchronization protocol packet and recording a synchronization protocol packet receiving time and a synchronization protocol packet sending time; a hardware clock; and a control unit controlling the packet detection unit and the hardware clock. The control unit reads out the packet receiving time and the packet sending time from the packet detection unit and informs a local master node. The local master node calculates a time offset between the local master node and the slave node, and informs the control unit. The control unit adjusts the hardware clock based on the time offset so that the local master node and the slave node are time synchronized.06-23-2011
20110211596SYSTEMS AND METHODS FOR SYNCHRONIZING FILTER RECORDS - Systems and methods for synchronizing filter records between a mobile device and a network node are described herein. Upon detection of a precedence contention when installing filters at the network node, a synchronization command can be initiated to synchronize the filter records between the mobile device and the network node.09-01-2011
20110255560TRANSMISSION OVER AN 12C BUS - A method and a system of multichannel transmission over a twin-wire bus including a data signal and a synchronization signal, data of a first channel being transmitted by a state coding of the data signal for a time period containing a first state of the synchronization signal, data of a second channel being transmitted by pulse coding outside of said period.10-20-2011
20100260207Ranging Between Radios Using Pseudo Time of Arrival Sequence - Systems and methods for refining the determination of the time of arrival (TOA) of given data. A portion of packet data is designated to be used as a pseudo TOA sequence. The packet information is modulated using, e.g., BPSK, and thereafter spread with a chipping stream known at both source and destination radios. The resulting stream includes a TOA reference pattern. On the receive side (destination radio), receive samples are despread and demodulated. The despread data is then XOR'ed with the chipping stream to re-create the TOA reference pattern. The re-created TOA reference pattern and original receive samples (previously stored) are passed through a correlator to obtain a correlation profile, which is then used for curve fitting/interpolation to accurately determine the TOA of the given received sample. Embodiments may be used in conjunction with a radio ranging system.10-14-2010
20100098110Method and Apparatus for Using Ranging Measurements in a Multimedia Home Network - According to various embodiments of the disclosure, systems, methods and apparatuses are provided for using ranging to improve network efficiency. In particular, various embodiments of the disclosure provide ranging to improve local clock time synchronization. According to one embodiment, a method for synchronizing a plurality of nodes on a communication network is provided, comprising: exchanging local clock times between a first node and a second node over the communication network; performing a ranging method between the first and second nodes based on the local clock times exchanged between the first and second nodes, wherein the ranging method results in an estimated propagation delay between the first and second nodes; and adjusting the local clock times of the first and second nodes based on the estimated propagation delay, thereby resulting in a synchronized local clock time at the first and second nodes.04-22-2010
20100002729SYNCHRONIZATION DEVICES AND METHODS - An exemplary embodiment of a synchronization device is provided. The synchronization device includes a memory, a demultiplexer, a comparator, and a sampling rate converter. The synchronization device has a system time clock (STC) and generates an output data with a first sampling rate. The demultiplexer receives a bit stream and extracts a packetized elementary stream (PES) from the bit stream. The demultiplexer writes the PES into the memory. The comparator obtains a presentation time stamp (PTS) from the PES and compares the PTS and the STC. The sampling rate converter has a converting factor, samples the PES in the memory, and generates the output data according to the PES. The sampling rate converter changes the converting factor according to the compared result of the comparator.01-07-2010
20090086765Synchronization system, synchronization signal transmitter, clock supplier, and synchronization method - A synchronization system for establishing synchronization between a first communications device and a second communications device connected through a communications line transmitting an xDSL signal is disclosed that includes a clock extraction part configured to extract, from a synchronous network connected to the first communications device, the synchronization clock signal of the synchronous network; a synchronization signal generation and transmission part configured to generate a synchronization signal from the synchronization clock signal and to transmit the synchronization signal to the communications line, the synchronization signal having a frequency in a frequency band different from the frequency band of the xDSL signal; a synchronization signal extraction part configured to extract the synchronization signal from the communications line; and a clock reproduction and output part configured to reproduce the synchronization clock signal from the synchronization signal and to supply the synchronization clock signal to the second communications device.04-02-2009
20080267222System for combining a plurality of video streams and method for use therewith - A system for combining a plurality of video streams includes a time stamp adjustment module that generates an adjusted second video stream by adjusting a plurality of time stamps of a second video stream. A video stream concatenation module generates a combined video stream by concatenating the adjusted second video stream to an end of a first video stream.10-30-2008
20080267221Data Sharing and Synchronization with Relay - Systems and methods for sharing and synchronizing data using the addition of synchronization data to a feed that contains data items, and in some implementations, at least a node or endpoint that provides relay functionality or relay capabilities to one or more endpoints, are disclosed. Such systems and methods may also include the communication of information about the data that is synchronized, in addition to synchronization of the data itself.10-30-2008
20110164629METHOD FOR DATA TRANSMISSION VIA DATA NETWORKS - A method for data transmission via data networks, in particular via ethernet-based data networks, having at least two participants; the data networks have at least one topological real-time field and one topological non-real-time field, and data telegrams sent via the data networks have at least one real-time part and at least one non-real-time part. By a coupling unit, data telegrams from the non-real-time field which arrive inside the real-time part are delayed and transmitted to the non-real-time part.07-07-2011
20080212618Method and System for Transmitting a Clock Rate on an Ethernet Network Link and Applications Thereof - The invention relates to a method for transmitting a clock rate on a network link, seat of a speed timing signal (DR), consisting of at least synchronizing (A), at an input point (I) of this network, this speed timing signal with a reference external clock rate (ESR) for generating a synchronized speed timing signal (SDR) propagating on the network, and of extracting, at an output point (O) of the network, the reference external clock rate (ESR) from the synchronized speed timing signal (SDR) for utilization. The invention is for providing networks that are seats of a speed timing signal such as FastEthernet and Gigabit Ethernet networks or of higher speed Ethernet networks.09-04-2008
20080212617System and method for synchronization of time sensitive user events in a network - The present disclosure relates generally to systems and methods for synchronization of time sensitive user events in a network. In one example, the method includes receiving an event from a client during a time window and receiving another event from another client during the time window. The events, which are considered to have occurred simultaneously due to their arrival within the same time window, are combined into a picture packet and the picture packet is sent to the first and second clients for execution.09-04-2008
20100309933METHOD FOR SYNCHRONIZING DATA MAINTAINED AT A PLURALITY OF NODES - A method for synchronizing data maintained at a plurality of data objects. The method involves assembling source and destination trees, each of the source and destination trees including a root node and one or more dependent nodes associated with source and destination data maintained at the plurality of data objects respectively. After the trees are assembled, a checksum calculation is performed for the nodes of the source tree and the destination tree based on the associated source data and the associated destination data maintained at the plurality of data objects respectively. The destination tree and the destination data are synchronized with the source tree and source data based on the comparison of the checksum calculations of corresponding nodes in the source tree and the destination tree. Missing nodes or nodes having mismatching checksums in the destination tree are identified and either added or modified to match the corresponding node or nodes in the source tree, while the data in the source data objects are fetched and copied by the destination data object corresponding to the added and/or modified nodes in the destination tree.12-09-2010
20100309932METHOD AND SYSTEM FOR COMPENSATED TIME STAMPING FOR TIME-SENSITIVE NETWORK COMMUNICATIONS - Aspects of a method and system for compensated time stamping for time-sensitive network communications are provided. In this regard, one or more timestamps generated in an OSI layer above the physical layer may be adjusted based on parameters associated with an amount of time in which data traverses a PHY of the network device. Communications of the network device may be managed based on the adjusted one or more timestamps. The parameters may comprise one or more of: average ingress PHY traversal time, average egress PHY traversal time, variance of ingress PHY traversal time, and variance of egress PHY traversal time. One or more network links coupled to the network device may be characterized based on the one or more adjusted timestamps. The parameters may be stored in one or more registers within a PHY of the network device.12-09-2010
20080205453Distributing a timing reference over a communications bus - On a communications bus, a relatively low frequency timing reference is distributed by regularly transmitting numbers that represent its instantaneous phase. An active framer component maintains a wrapping count of root superframes and, during each block, transmits in encoded form an expected value for the root superframe count at the start of the following block.08-28-2008
20110164627THREE-STAGE ARCHITECTURE FOR ADAPTIVE CLOCK RECOVERY - An adaptive clock recovery (ACR) system has a first closed-loop control processor (e.g., a first proportional-integral (PI) processor) that processes an input phase signal indicative of jittery packet arrival times to generate a mean phase reference. The input phase signal is compared to the mean phase reference to generate delay-offset values that are indicative of the delay-floor corresponding to the packet arrival times. The mean phase reference and the delay-offset values are used to generate offset-compensated phase values corresponding to the delay-floor. The ACR system also has a second closed-loop control processor (e.g., a second PI processor) that smoothes the offset-compensated phase values to generate an output phase signal that can be used to generate a relatively phase stable recovered clock signal, even during periods of varying network load that adversely affect the uniformity of the packet arrival times.07-07-2011
20110164628RECEPTION APPARATUS AND METHOD, PROGRAM AND RECEPTION SYSTEM - Disclosed herein is a reception apparatus, including: a reception section configured to receive an OFDM (orthogonal frequency division multiplexed) signal obtained by modulating a common packet sequence configured from a packet common to a plurality of streams and a data packet sequence configured from packets individually unique to the plural streams; a buffer configured to accumulate packets of the common packet sequence and the data packet sequence obtained by demodulating the received OFDM signal; a retaining section configured to retain correction information for correcting out-of-synchronism between the common packet sequence and the data packet sequence obtained from particular packets of the common packet sequence and the data packet sequence upon reading out of the packets accumulated in the buffer; and a correction section configured to correct the out-of-synchronism of the packet which suffers from the out-of-synchronism of the packets based on the correction information retained in the retaining section.07-07-2011
20120063473HIGH QUALITY TIMING DISTRIBUTION OVER DSL WITHOUT NTR SUPPORT - A method and system in which a Digital Subscriber Line Access Multiplexer (DSLAM) that is part of a DSL (Digital Subscriber Line) system is able to provide synchronous services to end user equipment connected to the DSLAM via a DSL link and Customer Premises Equipment (CPE). A sniffer device having direct or indirect access to a Primary Reference Clock (PRC) of the DSL system calculates the phase difference between the PRC and the DSLAM's Local Timing Reference (LTR). The phase difference is sent to the CPEs requiring accurate reference clock frequency. The CPEs are able to derive the PRC from the phase difference information transmitted by the sniffer device thus enabling synchronous end user equipment operation.03-15-2012
20100329286METHOD AND RECEIVING UNIT FOR SYNCHRONIZING A PACKET-ORIENTED RECEPTION WITH A CALCULATED TONE SIGNAL - In addition to the transmission of a tone signal (ts) according to the RFC standard 2833 via a network using Internet protocol, the tone signal is transmitted in the data packets (dp). Subsequently, the phase difference (Δφ) between the transmitted tone signal (ts) and the generated tone signal (ts′) is ascertained, before beginning the insertion of the generated tone signal (ts′) in the data packets (dp), and compared to a predetermined phase difference (φv). If the ascertained phase difference exceeds the predetermined phase difference (Δφ,φv), the phase of the generated tone signal (ts′) is changed by a predetermined phase (φ) with the aid of the tone generator (TG). The ascertainment of the phase differences (Δφ) and the change of the phase (φ) of the generated tone signal (ts′) is repeated until the ascertained phase difference is less than the predetermined phase difference (Δφ,φv), upon which instead of the transmitted tone signal (ts), the generated tone signal (ts) is inserted into the data packets (dp). A substantial advantage of the invention can be seen in that a phase detector does not have to be continuously active for the synchronization, but rather the synchronization must only be performed if a tone signal (ts) or tone information (ti) is received and the insertion of the generated tone signal (ts′) is imminent.12-30-2010
20100329284CENTRALIZED NODE CLOCK AUTO RECONFIGURATION - The invention is directed to a method and system for providing centralized automated synchronization clock reconfiguration in packet switched telecommunications networks having network nodes that do not implement Synchronization Status Messaging (SSM) internally. This is especially useful when integrating TDM networks with packet switching network elements having T1 and E1 interfaces.12-30-2010
20110261842METHOD AND APPARATUS FOR RESILIENT CLOCK TRANSFER OVER MULTIPLE DSL LINES - A system and method for transmitting and recovering external clock signals over links of a DSL system in which the external clock signals are used to synchronize transmitted physical layer signals from a CO of a DSL system and said external clock signals are derived from the received physical layer signals at an RT/CPE location of a DSL system. A clock recovery sub-system located at both the CO and the RT/CPE comprises a clock monitor circuit in communication with a Phase Lock Loop circuit. The clock monitor circuit at the RT/CPE is able to derive clock signals from the received physical layer signals and select one of said derived clocks to which a local reference clock at the RT/CPE is synchronized. The synchronized local reference clock, which can exist even when there are no valid derived clocks, may be used to transmit pseudowire frames (e.g., TDM data over Ethernet).10-27-2011
20080219294Network Element Manager Resynchronization - A network element manager (09-11-2008
20100166022SYNCHRONIZATION CONTROL DEVICE OF SLAVE DEVICES CONNECTED TO NETWORK AND METHOD THEREOF - The present disclosure relates to a synchronization control device and method of slave devices connected to a network capable of synchronizing operations of the slave devices, wherein a communication module generates a first synchronization signal and a second synchronization signal according to a distributed clock function, generating, by a processor, a control data for driving an actuator according to the first synchronization signal, outputting to a driver the control data if a synchronization interrupt is generated by the first synchronization signal, and inputting and processing, by the processor, a reception data of the communication module to generate the control data, and generating a timer interrupt on a period set up by a timer according to control of the processor, and generating, by the processor, the control data to output the generated control data to the driver if the first synchronization signal is not generated but the timer interrupt is generated.07-01-2010
20100195671SYNCHRONIZATION OF TWO COMMUNICATION NETWORKS OF AN ELECTRONIC DATA-PROCESSING SYSTEM - A method for synchronizing two communication networks of an electronic data-processing system, each of the networks including one or more respective nodes, may include establishing for each of the networks a respective time schedule that establishes at least one respective time slot for a respective synchronization message. The synchronization message time slots are established to coincide. The synchronization message of the first communication network is generated by one of the nodes of the first communication network. The synchronization message of the second communication network is generated as a function of the synchronization message of the first communication network.08-05-2010
20100195672DIAGNOSIS OF THE SYNCHRONIZATION OF TWO COMMUNICATIONS NETWORKS OF AN ELECTRONIC DATA-PROCESSING SYSTEM - A method for diagnosing a synchronization of two communications networks of an electronic data-processing system, each communications network including at least one node and having a respective schedule that specifies at least one respective time slot for a respective synchronization message, may include detecting, by each of the two communications networks, an individual time-based variable, comparing the two detected time-based variables to each other, and determining a quality of the synchronization of the two communications networks based on the comparison.08-05-2010
20100067553SYNCHRONIZATION OF VIDEO WITH TELEMETRY SIGNALS METHOD AND APPARATUS - An Ethernet-compatible synchronization process between isolated digital data streams assures synchronization by embedding an available time code from a first stream into data locations in a second stream that are known a priori to be unneeded. Successive bits of time code values, generated as a step in acquiring and digitizing analog sensor data, are inserted into least-significant-bit locations in a digitized audio stream generated along with digitized image data by a digital video process. The overwritten LSB locations are shown to have no discernable effect on audio reconstructed from the Ethernet packets. Telemetry recovery is the reverse of the embedment process, and the data streams are readily synchronized by numerical methods.03-18-2010
20110051754MEASUREMENT AND ADJUSTMENT OF REAL-TIME VALUES ACCORDING TO RESIDENCE TIME IN NETWORKING EQUIPMENT WITHOUT ACCESS TO REAL TIME - A system and method of synchronizing clocks in a distributed network is disclosed. A simple 1-pulse-per-second timing pulse is routed to time-stamping units in each network device and utilized to measure traffic-dependent synchronization packet residence delays within network elements. Synchronization messages are updated to reflect the measured residence times, thus creating transparent clocks that can readily be synchronized across the network. The simple timing pulse architecture allows the method to be applied readily both to new designs and to retrofit existing hardware.03-03-2011
20110051753WIDEBAND CABLE SYSTEM - A wideband cable modem system increases available bandwidth of a single channel by encoding a data stream into wideband packets. The wideband packets are associated with a logical wideband channel that extends over multiple physical downstream cable channels.03-03-2011
20110051752 method for clock link automatic protection in packet transport networks - A method for clock link automatic protection in packet transport networks is disclosed. The method includes that: extending the clock synchronization status message to allow said clock synchronization status message to include: a clock identification (ID), a quality grade of clock, the number of network elements that the clock has passed, a clock alarm indication, and a forbidden-use indication; each network element in the clock link processes the clock synchronization status message; and said each network element selected a clock source according to the clock synchronization status message. The method in the present invention allows the network elements to be able to automatically select the optimal routing clock, forbid non-optimal routing clocks to participate in the selection, and effectively prevent the clocks from looping.03-03-2011
20110188520Method for operating a time-controlled bus system - In a method for operating a time-controlled bus system, which communicates in communication slots in a sequence of communication cycles, a processing instruction, which is automatically generated from input data and configuration data, is used for processing communication tasks on the basis of time signals, the input data containing identifiers to identify the communication tasks, cycle information to assign the communication tasks to at least one communication cycle, and time position information to terminate the communication tasks within at least one communication cycle, and the configuration data contain data which define the communication tasks and/or describe the bus system.08-04-2011
20090175299SIGNAL DETECTION DEVICE AND SIGNAL DETECTION METHOD - A correlation unit (07-09-2009
20110216787METHOD AND APPARATUS OF SYNCHRONIZATION SCHEDULING - A method and apparatus for synchronization scheduling are disclosed in the present invention, wherein the method for synchronization scheduling includes that: lower layer network element(s) obtaining multiple synchronization sequences of a designated service from an upper layer network element to which the lower layer network element(s) belongs, wherein the upper layer network element processes data packets of the designated service according to a synchronization sequence length, and transmits the multiple synchronization sequences to the lower layer network element(s), wherein the synchronization sequences are a set of data packets with the same timestamp information; the lower layer network element(s) determining a scheduling transmission time interval according to the synchronization sequence length and time division multiplexing period of the designated service, wherein the scheduling transmission time interval is a common multiple of the time division multiplexing period and the synchronization sequence length, and the time division multiplexing period of the designated service is 1/n time of the period of a wireless interface connection frame number, n is an integer; and as for a synchronization sequence whose timestamp locates in a current scheduling transmission time interval, the lower layer network element(s) transmitting it in an available transmission period of a designated scheduling transmission time interval. The present invention can avoid the loss of service data.09-08-2011
20120147904VIDEO SIGNAL TRANSMISSION DEVICE, VIDEO SIGNAL TRANSMISSION AND RECEIVING SYSTEM, AND VIDEO PROCESSING SYSTEM, THAT TRANSMIT/RECEIVE OVER A CLOCK LINE - The present invention is intended to permit both real-time display of a picture represented by a non-compressed video signal on a television and display of a picture represented by a compressed video signal at any desired time by simultaneously transmitting the compressed video signal and non-compressed video signal via one interface. An STB packetizes a compressed video signal, and multiplexes the compressed video signal and a blanking signal combined with a non-compressed video signal. Thus, both the video signals are transmitted simultaneously. A picture represented by the non-compressed video signal is displayed on a television in real time. The compressed video signal is stored in a storage medium incorporated in the television, read at any user's desired time, and decoded so that a picture represented by the compressed video signal can be viewed at the user's desired time.06-14-2012
20120307845METHOD FOR DETECTING A SYNCHRONIZATION FAILURE OF A TRANSPARENT CLOCK AND RELATED PROTECTION SCHEMES - The method for detecting and managing a synchronization failure of a transparent clock is used in a packet network in order to determine and correct residence time of time-stamped packets within a traversed element of said network. The transparent clock is part of a Master/Slave synchronization path including a plurality of network elements and their associated transparent clocks. The method includes transmitting time-stamped packets from the Master to the Slave through different synchronization paths in order to have the Slave receiving multiple time signals transmitted through different paths, and determining a failure within a transparent clock of a failed/failing synchronization path if the time signal provided by said failed/failing path differs from the time signal provided by the other transmitting path(s).12-06-2012
20120307844Synchronization of Shared Identifiers Across Servers in an IMS Network - Methods and apparatuses, including computer program products, are described for synchronization of shared initial filter criteria in an IP Multimedia Subsystem (IMS) network. A first computing device in the IMS network transmits a registration request to a second computing device in the IMS network. The first computing device receives a response to the registration request from the second computing device, including an identifier associated with a shared initial filter criteria set stored at the first computing device. The first computing device determines whether the shared initial filter criteria set corresponding to the identifier is stored at the first computing device and transmits a retrieval request to the second computing device if the shared initial filter criteria set corresponding to the identifier is not stored. The first computing device receives the shared initial filter criteria set from the second computing device, and stores the shared initial filter criteria set.12-06-2012
20100135334METHOD, SYSTEM AND APPARATUS FOR SYNCHRONIZING SIGNALS - A system for synchronizing unrelated information or reference signals originating from multiple sources. The signals may be in different signal formats or subject to different delays at a receiving device. The system may include a master reference time generator connected to at least one of a plurality of slave reference signal generators via a packet network. The master reference time generator may include a master reference time counter and a sampling device for sampling the master reference time counter. The master reference time generator may encode time data in master reference time packets and feed these packets into the packet network. The slave reference signal generator(s) is adapted to accept the encoded time data as an input to generate a reference signal, the phase of which is calculated based on the time elapsed since an initial time point.06-03-2010
20090323727SYSTEMS AND METHODS FOR SYNCHRONOUS GENERIC FRAMING PROTOCOL MAPPING - The present invention provides systems and methods for mapping synchronous input signals, such as synchronous Ethernet, into Generic Framing Protocol (GFP) frames for using GFP directly on Optical Transport Network (OTN) while preserving the synchronous timing of the input signals. The present invention defines a mapping technique for GFP-based encapsulation that preserves timing information of an incoming client signal. The mapping technique makes use of the concept that a timing signal can be fractionally multiplied in frequency using factors that are ratios of integers without creating significant timing impairments.12-31-2009
20110150006DE-ENCAPSULATION OF DATA STREAMS INTO MULTIPLE LINKS - Embodiments of the invention are generally directed to de-encapsulation of data streams into multiple links. An embodiment of a method includes receiving a data stream including multiple data frames, the data stream being in a first mode having a multiple channels of content data including a first channel sent in a first position in each data frame and a second channel sent in a second position in each data frame following the first position, with each data frame including a synchronization signal to indicate a start of the content data. The method further includes transforming the data stream into data sub-streams in a second mode, the data sub-streams including a first data sub-stream to carry data for the first channel in the second mode and a second data sub-stream to carry data for the second channel in the second mode. Transforming the data stream into in the plurality of data sub-streams includes generating the first data sub-stream by stripping the second channel from each frame of data, and generating the second data sub-stream by stripping the first channel and the synchronization signal from each frame and inserting a substitute synchronization signal before the second channel data in each data frame. The method further includes transmitting the first data sub-stream via a first link in the second mode and the second data sub-stream via a second link in the second mode.06-23-2011
20120099608Synchronization Method and Device - A synchronization method is disclosed, including: obtaining a synchronization symbol position {circumflex over (d)}04-26-2012
20110305247METHOD FOR SYNCHRONIZING CLOCKS BY SEPARATED TRANSMISSIONS OF FIRST AND SECOND DATA VIA AT LEAST ONE TIMING DISTRIBUTION PROTOCOL, AND ASSOCIATED SYSTEM AND MODULE - A method is intended for synchronizing a client clock of a client communication node with a master clock in a data packet network. This method comprises the steps of: i) transmitting first data representative of timing information of the master clock from a source communication node to the client communication node via a time distribution protocol, ii) transmitting second data representative of a frequency reference correlated to the timing information from a chosen communication node to the client communication node via a time distribution protocol, and iii) differentiating the transmitted first and/or second data into the client communication node to synchronize the client clock with the master clock by means of the timing information and/or frequency reference represented by the differentiated first and second data.12-15-2011
20100254411NETWORK SYNCHRONIZATION OVER IP NETWORKS - Network timing is derived from the PSTN and distributed through the network to gateways capable of deriving timing from the incoming UDP stream. The derived timing has the correct frequency for voice telephony without using external timing sources or extraneous hardware components. For example, a digital signal processor (DSP) can derive the timing from a timed TDM bus and distribute messages, such as IP messages, to other gateways or port networks. The other gateways and port networks use the incoming stream to extract the timing which is then used to time their TDM bus. The port networks and gateways can also distribute other streams to other gateways in a fan-out type of arrangement. This internally generated timing can be used, for example, for Circuit Emulated Services (CES).10-07-2010
20110305248CLOCK SELECTION FOR SYNCHRONOUS ETHERNET - An Ethernet PHY may receive an indication from a local timing source that a local clock is suitable for propagation to a link partner. In response, a timer in the Ethernet PHY may be started. In instances that the Ethernet PHY receives, during a time period subsequent to starting the timer and before the timer reaches a predetermined value, an indication that the link partner is propagating a clock that is suitable for the Ethernet PHY to synchronize to, the Ethernet PHY may be configured as timing slave. In instances that the Ethernet PHY does not receive, during the time period subsequent to starting the timer and before the timer reaches a predetermined value, an indication that the link partner is propagating a clock that is suitable for the Ethernet PHY to synchronize to, Ethernet PHY may be configured as timing master upon the timer reaching the predetermined value.12-15-2011
20110069721Packet Flow Side Channel - A packet flow side channel encoder and decoder embeds and extracts a side channel communication in an overt communication data stream transmitted over a network. The encoder selects more than one group of related packets being transmitted on the network, relates a packet of one group to a packet of another group to form a pair of packets; and delays the timing of at least one packet from each pair of packets The decoder determines inter-packet delays that are the difference in timing between two packets in a pair of packets; determines at least one inter-packet delay difference between two or more determined inter-packet delays; and extracts a bit using the at least one interpacket delay difference.03-24-2011
20080259966Synchronization of one or more source RTP streams at multiple receiver destinations - In one embodiment, a method includes synchronizing to a common reference timeframe between a sender node and a plurality of receiver nodes connected over a packet-based network. The sender node sends Real-Time Protocol (RTP) frames to the receiver nodes, and also sends a RTP Control Protocol (RTCP) sender report to each receiver node that contains a rendering offset value, each receiver node rendering the RTP frames at a render time equal to a sampling time in units of the common reference timeframe plus the rendering offset value. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.10-23-2008
20100111112AUTOMATED SYNCHRONIZATION OF DATA BETWEEN ELECTRICAL GRIDS - A method and system of automatically correlating data measured by monitoring devices that monitor first and second electrical grids. The second electrical grid producing alternating current signals that are electrically isolated from alternating current signals produced by the first electrical grid. An example power monitoring device includes a controller, a first monitoring device interface and a second monitoring device interface. The first monitoring device interface is coupled to a first monitoring device in the first electrical grid and the second monitoring device interface is coupled to a second monitoring device in the second electrical grid. A first counter stores data counts of occurrences from the first electrical grid. A second counter stores data counts of occurrences from the second electrical grid. A synchronization monitoring algorithm automatically synchronizes the first and second counters by associating a data count from the first counter with a data count from the second counter with a time from either the first or second grid corresponding to the occurrence of an event on either the first or the second electrical grid or both.05-06-2010
20110090925METHOD FOR SYNCHRONIZATION IN NETWORKS - The invention relates to a method for synchronization in networks, whereby the local time (h04-21-2011
20110317724Communication device, packet synchronization method - A communication device is provided, with which packet synchronization is achieved based on input data transmitted by an external device, without using a special protocol between the communication device and the external device. An external TE attaches a CRC code to each packet before transferring data to a mobile terminal (UE). Data is bulk transferred from the external TE to the UE according to a USB protocol. At the UE, the CRC code of the input data is detected at a CRC processing unit 12-29-2011
20120002684DMR Private Network Communication Implementation Method, Terminal, Relay Station and System - The present invention relates to a private network communication technology, and it provides an implementation method, terminal, relay station and system for DMR private communication with respect to the existing defects that each of the communication terminals can only communicate with each other by using the same time slot in a group, and thereby a frequency width of 12.5 KHz can not be used sufficiently. The DMR private network communication terminal includes a communication module for receiving CACH information, receiving and transmitting DMR private network communication, a synchronization module for establishing synchronization and determining which time slot the received DMR private network communication occupies based on the received CACH information; and controlling the communication module to make a response for the received DMR private network communication in the time slot. The present invention further provides an implementation method, relay station and system for DMR private network communication. Each path of DMR private network communication only occupies one time slot, the case of occupying different time slots at different time can be avoided. In this case, the stability of the idle time slot can be ensured, and other DMR private network communication terminals can initiate new DMR private network communication by locking unoccupied idle time slot; thereby achieving a full usage of the frequency width of 12.5 KHz.01-05-2012
20120027030NETWORK TERMINAL, NETWORK SYSTEM, TIME SYNCHRONIZATION METHOD, AND TIME SYNCHRONIZATION PROGRAM - A network terminal has communication section that communicates with other network terminals connected via a network, time-series data creation section that, at timing set beforehand, creates time information including a correspondence between an identification number of the own network terminal and a current time measured by a timer of the own network terminal and creates time-series data registering the time information, and additional registration section that, when the communication section receives the time-series data transmitted from another network terminal, creates time information including a correspondence between the identification number of the own network terminal and a current time measured by the timer of the own network terminal and additionally registers the time information to the time-series data received this time.02-02-2012
20120207182Encoding System and Encoding Apparatus - An encoding apparatus 08-16-2012
20120063472METHOD FOR PROCESSING DISTRIBUTED DATA HAVING A CHOSEN TYPE FOR SYNCHRONIZING COMMUNICATION NODES OF A DATA PACKET NETWORK, AND ASSOCIATED DEVICE - A method is intended for processing distributed data of a chosen type in a data packet network comprising communication nodes (N03-15-2012
20090135855Apparatus for automatically synchronizing setting information of wireless device - Provided is a portable device having an automatic setting information synchronizing function for a two-way radio communication. The portable device includes a radio communication unit for transmitting/receiving data to/from an external fixing device via a two-way radio communication, an input/output unit for providing an input/output interface, a synchronizing unit for receiving setting information from the external fixing device, and a central processing unit for controlling the radio communication unit, to thereby receive the setting information through the synchronizing unit upon connection with the external fixing device and to transmit/receive various data inputted/outputted through the input/output unit based on the received setting information via the two-way radio communication upon release of connection with the external fixing device.05-28-2009
20090135854SYSTEM AND METHOD FOR CLOCK SYNCHRONIZATION - A system and a method are provided for clock synchronization. The method includes receiving a new transmitter timestamp based upon a transmitter clock, determining a new transmitter timestamp delta between the new transmitter timestamp and a previous transmitter timestamp, determining a new receiver timestamp delta between a new receiver timestamp and a previous receiver timestamp, comparing the new receiver timestamp delta to the new transmitter timestamp delta, and adjusting a receiver clock to minimize a compared difference between the new receiver timestamp delta and the new transmitter timestamp delta. The new receiver timestamp is determined upon reception of the new transmitter timestamp. The previous receiver timestamp is determined upon reception of the previous transmitter timestamp.05-28-2009
20090135856MULTIMEDIA APPARATUS AND SYNCHRONIZATION METHOD THEREOF - A multimedia apparatus and a synchronization method thereof are provided. The multimedia apparatus includes a video output unit which outputs a video, and a control unit which transmits an audio signal to the external device through the communication module and operates the video output unit to display a video corresponding to the audio signal by delaying the video based on delay information received from the external device through the communication module.05-28-2009
20120155496TESTING DEVICE, TESTING METHOD, AND COMPUTER READABLE STORAGE MEDIUM - A test information obtaining unit captures an actual transaction from a pre-operation server and stores it in a pre-operation packet storing unit. A time synchronization control section synchronizes the time of a post-operation server with a time of the acquisition times of the captured packets. After performing this time synchronization, a test implementation section performs a test by sequentially transmitting the packets to the post-operation server, thus making responses of the pre-operation server and the post-operation server the same.06-21-2012
20120300795NETWORK DISTRIBUTED PACKET-BASED SYNCHRONIZATION - A transparent clock may be provided between edge nodes of a non-precision time protocol network, with an arrival time of a packet at an edge of the non-precision time protocol network carried in a reserved field of a packet.11-29-2012
20120300794GUARDIAN SCRUBBING STRATEGY FOR DISTRIBUTED TIME-TRIGGERED PROTOCOLS - A cluster comprises a plurality of end nodes that communicate with one another over at least one communication channel. Each end node is assigned a time slot for transmission of frames; wherein each node comprises a local guardian configured to prevent transmission of timing-related frames sourced from the respective end node. The cluster also comprises a special node that communicates with the plurality of end nodes, wherein the special node establishes a time base and sources timing-related frames to the plurality of end nodes. The transmission schedule includes at least one common scrubbing time slot during which each of the plurality of end nodes is configured to generate a timing-related frame. The special node is configured to determine if the local guardian in any of the plurality of nodes failed to prevent transmission of the respective generated timing-related frame during the common scrubbing time slot.11-29-2012
20100118895Network timing synchronization systems - A method and means synchronize timing of a follower system to a reference system. A Hierarchical CFF function (“HCFF”) is applied to a set of Correction Factor Functions types (“CFFs”) or a set of other HCFF. Each CFF type uses the same input data set specific to that type and generates at least one Correction Factor Solution (“CFS”) for each of the CFF, wherein the CFS consists of only CF or the CFS consists of both i) CF and ii) a SACF. The HCFF takes as input a set of CFS and generates at least one CFS, wherein the CFS consist of only the CF, or the CFS consists of both the i) CF and ii) a SACF.05-13-2010
20100172379METHOD FOR SYNCHRONIZING A TRANSMISSION OF APPLICATIONS DATA FRAMES, CORRESPONDING SENDER AND RECEIVER DEVICES AND STORAGE MEANS - It is proposed a method for synchronizing a transmission of applications data frames provided to a sender device, the transmission being done between said sender device and at least one receiver device via a synchronous communications network implementing a clock that defines a network cycle.07-08-2010
20090196312Integrated circuit - An integrated circuit multiplexes transmission data faster than by a system clock, and transfers a timing pulse Txclk for that multiplexing and a multiplexed signal Txdata from a transmitter chip 08-06-2009
20120250704NETWORK NODE, TIME SYNCHRONIZATION METHOD AND NETWORK SYSTEM - In order to select a synchronization signal higher in accuracy, thereby increasing the accuracy of the time synchronization, it is provided a network node for transferring data in a network, comprising: a network interface having a plurality of ports; a transfer control module; a time synchronizing module; a fluctuation measurement module; and a clock. The time synchronization module uses a received time synchronization packet to synchronize the clock. The fluctuation measurement module determines an accuracy of a time contained in the received time synchronization packet based on a result of comparison between the time contained in the received time synchronization packet and a time of the clock.10-04-2012
20120314721TIMING RECOVERY METHOD AND APPARATUS FOR AN INPUT/OUTPUT BUS WITH LINK REDUNDANCY - Methods and apparatus are provided for timing recovery for an input/output bus with link redundancy. A parallel input/output interface receiver includes a plurality of data receivers, each configured to respectively receive input data from a respective one of n+m channels, where n is an integer greater than one and m is an integer greater than or equal to one. The input data is non-calibration data for the n channels and is calibration data for the m channels. The interface receiver further includes a first phase adjustor configured to provide a first clock signal to the plurality of data receivers for sampling of only the non-calibration data at any given time, and a second phase adjustor configured to provide a second clock signal to the plurality of data receivers for sampling of only the calibration data at any given time.12-13-2012
20090059962SYNCHRONIZING RELATED DATA STREAMS IN INTERCONNECTION NETWORKS - A method and apparatus for synchronizing related data streams in interconnection networks. Some embodiments of an apparatus include a transmitter to transmit a data stream to a second apparatus, where the transmitter transmits a data packet to the second apparatus. The apparatus further includes a clock, with the apparatus providing a first timestamp for the data packet using the clock upon transmission of the data packet. The apparatus includes a receiver to receive responses from the second apparatus, with the apparatus providing a second timestamp upon receiving a returned packet from the second apparatus, with the returned packet containing timestamps for the receipt and transmission of the packet by the second apparatus. The apparatus includes a network unit to direct the operation of the apparatus, the network unit to determine a start time for decoding of the data stream by the second apparatus based at least in part on the timestamps for the packet.03-05-2009
20090059963LINE TERMINAL FOR DETERMINING OPERATIONAL STATUS OF A U INTERFACE - A line terminal for determining operational status of a U interface includes a time presetting module, a current detecting module, a cycle selecting module, a timer, and a synchronization determining module. The time presetting module is for presetting a plurality of time cycles. The current detecting module is for detecting a loop current flowing via the U interface. The cycle selecting module is for selecting a time cycle from the plurality of time cycles. The timer is for timing during the time cycle. The synchronization determining module is for determining if a line terminal has been synchronized with a digital service unit. The operational status of U interface is determined to be working normally when the line terminal has been synchronized with the digital service unit. A method for determining the operational status of U interfaces is also provided.03-05-2009
20120170597SYNCHRONIZING MULTIPLE SYSTEM CLOCKS - Techniques are disclosed for synchronizing multiple clock sources of a system, and may include: determining time of a first clock at a first and second time instants; determining time of a second clock at a third time instant occurring between the first and second time instants, and a fourth time instant occurring after the second time instant; and determining a clock offset between the first and second clocks based on the determined times. The first and/or second clocks may be adjusted based on the clock offset to synchronize clock operation. This adjusting can be used, for instance, to synchronize operation of an audio and/or video component operating according to the first clock with an audio and/or video component operating according to the second clock. The techniques may further include determining if the clock offset is valid (e.g., based on detection of perturbing events or difference between a clock's times).07-05-2012
20120257642METHOD FOR SYNCHRONIZING CLOCKS IN A COMMUNICATION SYSTEM - A method for clock synchronization between higher layers using synchronization information provided from lower layers in multi-clock communication system in which the higher layers and the lower layers use heterogeneous clocks is provided.10-11-2012
20120257641METHOD, A COMPUTER PROGRAM PRODUCT, AND A CARRIER FOR INDICATING ONE-WAY LATENCY IN A DATA NETWORK - Disclosed herein is a method, a computer program product, and a carrier for indicating one-way latency in a data network (N) between a first node (A) and a second node (B), wherein the data network (N) lacks continuous clock synchronization, comprising: a pre-synchronisation step, a measuring step, a post-synchronisation step, an interpolation step, and generating a latency profile. The present invention also relates to a computer program product incorporating the method, a carrier comprising the computer program product, and a method for indicating server functionality based on the first aspect.10-11-2012
20120177068TIME SYNCHRONIZATION IN WIRELESS COMMUNICATION NETWORKS - A communication terminal includes a Radio Frequency (RF) unit and a baseband processor. The RF unit is operative to receive signals from a Base Station (BS) of a wireless communication network using a communication protocol that defines time frames divided in a time domain into zones. Each zone corresponds to a respective communication mode between the BS and the terminal and occupies respective time intervals within the frames.07-12-2012
20120177067CONTENT SYNCHRONIZATION APPARATUS AND METHOD - A content synchronization apparatus is provided. The content synchronization apparatus includes a communication unit configured to communicate with a device that the content synchronization apparatus can synchronize content with, a control unit configured to, in response to a synchronization command to share current content being played by the device being received, share the current content by acquiring the current content and state information corresponding to the current content through the communication unit, synchronize the current content with the device using the current content and the state information, and configure a display screen based on the results of the synchronization of the current content with the device, and an output unit configured to display the configured display screen.07-12-2012
20100008383SYNCHRONIZED COMMUNICATION SYSTEM - A synchronized communication system is provided in which even when communication devices are connected in series to a transmission path, devices connected to the communication devices are synchronized so that a communication cycle can be reduced. A second communication device includes a relay path and a return path which do not pass through a storage device, and a path selection switch therefor. A first communication device instructs switching of the return path from the transmission path, measures a transmission path delay time, notifies the second communication device of it, and sends a reference time of the first communication device for each communication cycle. The second communication device corrects its reference time using the transmission path delay time and the reference time. When a new second communication device is found during synchronized communication, the first communication device also performs transmission path delay measurement using the remaining time in the communication cycle.01-14-2010
20120263193TRANSMISSION SYSTEM, TRANSMITTING DEVICE, RECEIVING DEVICE, TRANSMISSION METHOD, AND COMPUTER PROGRAM - Disclosed is a transmission system, having a transmitting device and a receiving device, which divides a series of data streams into a plurality of unit data and transmitting the unit data. The transmitting device and receiving devices include synchronization units outputting mutually synchronized clock signals. A frequency change unit changes a frequency of a time division multiplexing (TDM) signal on the basis of the clock signal output from the synchronization unit of its own device. A conversion unit converts the TDM signal with the changed frequency into the unit data and transmitting the unit data to the receiving device. A decoding unit receives the unit data from the transmitting device and generates the TDM signal with the changed frequency. A frequency restoration unit restores the TDM signal by returning a frequency of the TDM signal with the changed frequency to an original on the basis of the clock signal.10-18-2012
20120263194METHOD AND APPARATUS FOR MEASURING SWITCHING TIME OF ETHERNET RING NETWORK - The present invention provides a method for measuring switching time of an Ethernet ring network, which comprises the following steps: synchronizing a local time of each node in the Ethernet ring network (10-18-2012
20120082173CLOCK SYNCHRONIZATION - In a clock synchronization system, clocks on a local area network are synchronized to a standard time signal such as the Network Time Protocol (NTP) signal or the Global Positioning System (GPS) time signal. A terminal on the network enables a user to introduce an offset to the clocks individually so that clocks can display the time in different time zones.04-05-2012
20120327957DATA PACKET SYNCHRONIZATION AND RETURN-TO-ZERO CONVERSION - The present invention relates to a system and method that enable transmission of multiple data packet lines as an optical time-division multiplexed signal. The invention provides a method and system that can synchronize data packet signals to a clock and convert them into return-to-zero signals. When multiple data packet lines are converted, they can be multiplexed together and transmitted according to well-known methods.12-27-2012
20110038388COMMUNICATION SYSTEM INCLUDING A DATA BUS AND MULTIPLE USER NODES CONNECTED THERETO, AND METHOD FOR OPERATING SUCH A COMMUNICATION SYSTEM - A communication system is described that includes a data bus and multiple user nodes connected to the data bus. Also described is a method for operating such a communication system. Data frames for data transmission each include a data field and/or a control field and a check sum field. One user has a high-precision clock generator (for example, precise quartz, MEMS resonator, etc.), and the remaining users have a clock generator (for example, an RC oscillator or imprecise quartz) having a lower precision. During operation of the communication system calibration messages are present on the data bus, and the users having the imprecise clock generator receive a calibration message. The users having the imprecise clock generator calibrate the imprecise clock generator to a system clock signal of the data bus, taking into account information contained in the received calibration message. To expedite the calibration of such a communication system and at the same time conserve bandwidth on the data bus, any given messages transmitted via the data bus are used as calibration messages for calibrating the system. For the calibration, a distance (NOPN) between an edge in the data field or in the control field of a received data frame and another edge in a field of the received data frame is measured in oscillator periods. The number (NB) of bits between these two edges is counted, and a clock divider which generates a system clock signal of a data bus protocol control system of the user to be calibrated is to be set so that a system clock signal period has a length of NOPN/NB·NTQ oscillator periods.02-17-2011
20120269204METHOD FOR GENERATING A ROBUST TIMING CORRECTION IN TIMING TRANSFER SYSTEMS - High accuracy timing over packet networks is achieved by generating correction factors from multiple separation intervals and timing information contained in packets in both directions between a master and a slave. The methods are based on evaluating the weighted average of short-term, medium-term, and long-term measurements of local clock offset. Weighted averages are used to develop robust correction terms that are modified with an α-shaping factor to provide additional immunity to packet network instabilities.10-25-2012
20120093177COMMUNICATION METHOD USING TIME-DIVISION MULTIPLEXING - A communication method using time-division multiplexing that enables permanent communication between user terminals. One of the terminals is a master terminal, the others being slave terminals. The transmission channel is divided into frames, each frame being divided into time slots. Each slave terminal identifies a free time slot in the current frame, in listening mode, and transmits data in the identified time slot, in transmission mode, during at least one following frame. As soon as the slave terminal ceases transmitting, the identified time slot becomes free again.04-19-2012
20110211597Network synchronization system and information processing device - In a network synchronization system including plural information processing devices, a first information processing device includes a synchronization-use common storage unit configured to copy and store first information for each user authorized to use the first information processing device, so that the first information can be shared with another information processing device; and a second information processing device includes a setting information unit configured to store second information for each user authorized to use the second information processing device, and a synchronization control unit configured to compare the second information with the first information, and to update the second information to latest information based on a result of the comparison. The synchronization control unit acquires common update information common to the information processing devices, which is stored in the synchronization-use common storage unit.09-01-2011
20110235657Multimode Apparatus and Method - A method and apparatus are herein provided to align media access control (MAC) cycles of networks of different medium types. Information is obtained that indicates a timing information of a first MAC cycle in a first network of a first medium type and a second MAC cycle in a second network of a second medium type. A buffer is provided for storing the timing information. Alignment information is derived based on the timing information of the first/second network that enables alignment of the MAC cycles between the first and second networks. A controller unit is provided for deriving the alignment information.09-29-2011
20110249688Maintaining Time of Day Synchronization - A technique for maintaining time synchronization between network nodes involves broadcasting a timing signal from a source node to its neighbors. The timing signal is transmitted in a dedicated source time slot of a super epoch comprising a number of epochs each having a number of time slots. A reply timing signal is received at the source node from a neighboring node designated as the destination node, where the reply timing signal is received in a dedicated destination time slot of the super epoch. The clock drift and propagation delay between the source and destination nodes are computed at the source node. At the neighboring nodes other than the destination node, clock drift can be computed using previous estimates of propagation delay. RTS and CTS exchanges from PTP packets can also be used to estimate the propagation delay in the source node and the clock drift in the destination node.10-13-2011
20120320933METHOD AND APPARATUS FOR TRANSPORTING TIME RELATED INFORMATION IN A PACKET SWITCHED NETWORK - A time aware device for a packet switched network comprising at least one time tag processing unit adapted to process time tag data of a predetermined time tag data field (TTDF) provided within a header of a tagged data packet (TDP) transported in said packet switched network to provide time related information reflecting a delay undergone by said tagged data packet (TDP) during its transport in said packet switched network.12-20-2012
20120287948CONFIGURATION OF SYNCHRONISATION NETWORK - Configuring a node (11-15-2012
20130010814NODE DEVICE, COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD - A node device that conducts time synchronization processing, the node device including: a processor configured to measure a reception time of a time synchronization message transmitted addressed to another node device from a master node device, the time synchronization message including information of a transmission time from the master node device, to detect the time synchronization message, and extracts information of the transmission time from the detected time synchronization message, and to correct a time in the processor based on the extracted information of the transmission time and the information of the reception time, and a transmitter configured to forward the time synchronization message to the another node device when the time synchronization message received by a receiver addressed to the another node device.01-10-2013
20130010813Method and Apparatus for Optimizing Packet Timing Transport - There is provided a method of optimizing timing packet transport in a network node, the method comprising using a locally available stable frequency reference at the network node to provide a pre-determined network node transit time for timing packets in at least one direction into or out of the network node. There is also provided a network node comprising a locally available stable frequency reference and circuitry adapted to apply a pre-determined network node transit time, L, to all timing packets transiting the network node in at least one direction into or out of a network node dependent on the locally available stable frequency reference.01-10-2013
20130010812SYSTEMS AND METHODS FOR SYNCHRONIZING VARIOUS TYPES OF DATA ON A SINGLE PACKET - Data recording systems (01-10-2013
20100061404METHOD FOR STARTING A COMMUNICATION SYSTEM, A COMMUNICATION SYSTEM HAVING A COMMUNICATION MEDIUM AND A PLURALITY OF SUBSCRIBERS CONNECTED THERETO, AND SUBSCRIBERS OF SUCH A COMMUNICATION SYSTEM - A communication system having a communication medium and at least two subscribers connected thereto is described; the communication system being designed for transmitting data among the subscribers via the communication medium in communication frames of communication cycles via a time-triggered protocol. To accelerate the start of the communication system before the actual data transmission, the communication system has a device for generating at least two different synchronization frames per communication cycle and per channel, in at least one of the subscribers, e.g., in the node AB. For example, the device is designed as two separate communication controllers per transmission channel. As an alternative, the device may also be designed as a simple logic circuit, a so-called application-specific standard product. For generating the at least two different synchronization frames per communication cycle, the subscriber is designed as an active star coupler of the communication system. Data transmission in the communication system is preferably performed using the FlexRay protocol.03-11-2010
20130016738METHOD AND APPARATUS FOR IMPLEMENTING FRAME HEADER ALIGNMENT AND MULTI-FRAME ZEROINGAANM Yu; ShideAACI ShenzhenAACO CNAAGP Yu; Shide Shenzhen CNAANM Ma; WenkaiAACI ShenzhenAACO CNAAGP Ma; Wenkai Shenzhen CN - The present invention discloses a method for implementing frame header alignment and multi-frame zeroing. By using one indication signal, the period of which is 256 times of that of a single frame, the frame header alignment for frame data is completed, and the multi-frame zeroing for frame data is implemented. The present invention also discloses an apparatus for implementing frame header alignment and multi-frame zeroing. The implementation process of the present invention is simple, the process comprising the frame data processing in an Optical Transport Network (OTN) cross dispatching system can be effectively simplified, the complexity of system processing can be significantly decreased, and the logical resources of the system can be saved.01-17-2013
20110158263TRANSIT TIME FIXATION DEVICE - A transit time fixation device and a control method of the same is provided which can constantly fix transmission delay time in relation to synchronous frames, and allows a high accuracy sampling synchronization control. The frame 06-30-2011
20110158261SERIAL BUS DEVICE AND CLOCK DIFFERENCE COMPENSATION METHOD THEREOF - A serial bus device for transmitting a packet to a link partner is provided. The serial bus device includes a processing unit and a clock difference compensation unit coupled to the processing unit. The processing unit generates the packet. The clock difference compensation unit determines whether to transmit at least one skip ordered set to the link partner prior to the packet according to a type of the packet, so as to compensate for a clock difference for the link partner.06-30-2011
20110158260CROSS-SCOPE SYNCHRONIZATION OF DATA ITEM KNOWLEDGE AND CORRESPONDING METADATA - The subject disclosure relates to cross scope synchronization among different sets of nodes that synchronize the same data item(s) according to different synchronization scopes. In one aspect, create and update versions are defined for a scope in which a data item was created and updated, respectively, and create and update versions are defined for a local node shared for different groups of nodes synchronizing according to the different synchronization scopes (e.g., a server node).06-30-2011
20130170507TIME SYNCHRONIZATION FOR NETWORK TESTING EQUIPMENT - The invention relates to time synchronization between network testing elements in distributed network monitoring and testing systems, and provides a condensed PTP process wherein the number of timing messages exchanged between master and slave in one iteration of the time synchronization process is reduced. Furthermore, timing messages are encrypted to provide for a more secure synchronization process. One aspect of the method provides for an automatic detection and adaptive handling of protocol stacks of received timing packets.07-04-2013
20080225899System and method for the synchronization and distribution of telephony timing information in a cable modem network - A method for synchronizing clocks in a packet transport network. The method comprises, receiving an external network clock at a central packet network node and transmitting timing information to a plurality of packet network devices, the timing information based upon the external network clock. The method further comprises, transmitting and receiving data that is synchronized to the timing information to a plurality of connected packet network devices. And finally, delivery of packets to an external interface via a packet network that contains data synchronized to the external network clock.09-18-2008
20080225898Method and apparatus for detecting and compensating for jitter in a communications network - Jitter in a clock signal can cause communications faults in communications networks, such as in networks in which downstream nodes use recovered clock signals as timing for upstream communications. An embodiment of the present invention detects and compensates for jitter in a network by recovering a reference clock associated with communications signals between nodes, such as an Optical Line Terminal (OLT) and Optical Network Terminal (ONT) in a Passive Optical Network (PON). A local clock is synchronized with the reference clock. Jitter induced faults may be detected and compensated for by increasing the synchronization rate, then decreasing the synchronization rate until jitter induced faults begin to occur. A loss or change in a rate of communications errors occurring as a function of the synchronization rate may be monitored and reported to a system operator. Compensating for jitter by adjusting the synchronization rate provides for robust communications between network nodes.09-18-2008
20080225897Providing clock synchronization in a network - In one embodiment, an apparatus for providing clock synchronization in a packet-based network, the network having as components nodes and links therebetween and having a network topology, is arranged to compute a forward clock synchronization packet path to a synchronization destination from the network topology according to a computation rule such that the return path for a clock synchronization packet from the synchronization destination is the same as the forward path.09-18-2008
20110274124Method and Device for Packet Network Synchronization - A method is described for synchronizing a clock of a client (11-10-2011
20130100966SYSTEM FOR TRANSFERRING ELECTRIC POWER AND SIGNALS VIA POWER LINE BY TIME-DIVISION MULTIPLEXING - A system for transferring electric power and signals via a power line by time-division multiplexing includes a power line, electronic-circuit units, and controllers. The power line includes a first transmission line and a second transmission line. The first transmission line is connected with a first switch in series and is therefore divided into a source end and a loading end. The electronic-circuit units are connected in series between the loading end and the second transmission line. The controllers are electrically connected with and are configured for synchronously controlling the first switch and the electronic-circuit units. When the first switch is closed, electric power is transferred from an electric power source to the loading end, and when the first switch is opened, the electronic-circuit units transfer signals via the loading end. The system features simple circuitry and effectively reduces noise in signal transmission.04-25-2013
20110268139SYNCHRONIZING NODES OF A MULTI-HOP NETWORK - A method for synchronizing nodes of a multi-hop network with a Time Division Multiplex Access scheme (TDMA), the nodes being hierarchically arranged in different levels, including a step of organizing the TDMA by periodic superframes, the respective superframe having a number of frames including at least a broadcast frame, a step of providing the respective broadcast frame with a number of slots, the number of slots being equal to a number of parent nodes in the multi-hop network, a step of assigning each parent node one slot in the broadcast frame in dependence on its level, and a step of distributing a synchronization information to the parent nodes by means of the broadcast frame, respectively.11-03-2011
20110222560PHYSICAL LAYER TRANSCEIVER WITH INTEGRATED TIME SYNCHRONIZATION - Disclosed, inter alia, is a Physical Layer Transceiver (PHY) with integrated time synchronization, such as, but not limited to, IEEE 1588 Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems. The PHY includes circuitry to maintain a current time, and to trigger the storage of timestamps corresponding to received frames. Typically, in response to a request from an external device, the timestamps are retrieved from storage and are communicated to the external device. By moving the triggering of the storage of the timestamps by the PHY itself, rather than by a monitoring of the traffic between the PHY and the Media Access Controller (MAC), higher accuracy can typically be achieved09-15-2011
20100290486A Digital Multimedia Network With Latency Control - The present invention relates to a digital multimedia network 11-18-2010
20130100967Systems and Methods for Synchronization of Clock Signals - A terminal of an exemplary transmitting device is configured to receive an initial clock signal. A first phase lock loop is configured to lock a phase of an initial periodic signal with a phase of the initial clock signal. A transmitting data block interface is configured to provide the plurality of data blocks with samples of the initial periodic signal to a receiving device. An exemplary receiving device includes a receiving data block interface configured to receive the plurality of data blocks. A second phase lock loop is configured to recreate the initial periodic signal and lock a phase of the recreated periodic signal with a phase of the samples of the initial periodic signal. The clock signal generator is configured to recreate and provide the initial clock signal. The recreated clock signal is synchronized to the initial clock signal based on the phase of the recreated periodic signal.04-25-2013
20100316069Network Clock Synchronization Floating Window and Window Delineation - A network component comprising at least one processor configured to implement a method comprising initiating a synchronization window, and promoting the transmission of a frame comprising a control symbol, wherein the control symbol delineates a beginning of the frame, and wherein the control symbol is offset from the beginning of the synchronization window. Also disclosed is a system comprising an upstream node in communication with a downstream node, wherein the upstream node transmits a data stream comprising a plurality of frames to the downstream node, wherein the data stream is organized into a plurality of synchronization windows, and wherein the frames float within the synchronization windows. Included is a method comprising transmitting an Ethernet data stream comprising an Ethernet control symbol, wherein the Ethernet control symbol is transmitted within a synchronization window and delineates a start of a packet within the synchronization window.12-16-2010
20130182723COMMUNICATIONS SYSTEM AND RELATED METHOD FOR REDUCING CONTINUITY CHECK MESSAGE (CCM) BURSTS IN CONNECTIVITY FAULT MANAGEMENT (CFM) MAINTENANCE ASSOCIATION (MA) - In accordance with a non-limiting example, a system and method minimizes collisions between transmitted connectivity fault management (CFM) packets. Maintenance association endpoints are formed from a plurality of network switch elements to form a maintenance association. The clocks between each network switch element within the maintenance association are synchronized. A unique transmission window is assigned to each maintenance association endpoint as part of the maintenance association. A respective CFM packet is transmitted as a continuity check message (CCM) within the unique transmission window.07-18-2013
20130188656Communicating Control Information for a Data Communications Link Via a Line Being Calibrated - Control information for controlling a parallel data link is communicated on a line being calibrated. Preferably, the parallel data link includes a redundant line. The redundant line permits one line to be calibrated while the others carry functional data, a switching mechanism enabling each line to be selected in turn for calibration. The control information preferably includes information for coordinating calibration activity. Preferably, the link is bi-directional, having a separate redundant line in each direction, enabling a bi-directional handshaking protocol to be used for communicating control information. Preferably, the lines selected for calibration are time-multiplexed to carry calibration patterns and control information at different time intervals.07-25-2013
20120020376Apparatus, method, and system for synchronizing time - The present invention relates to an apparatus, method and system for synchronizing time. The method includes: extracting line clock frequency information from an input line code stream, and extracting a time synchronization packet from a packet stream corresponding to the input line code stream; sending the input line code stream after extracting the line clock frequency information and the time synchronization packet to a packet switching device; receiving an output line code stream sent by the packet switching device; and calibrating local time according to the line clock frequency information and the time synchronization packet, recovering line clock frequency information of the output line code stream according to the calibrated local time, and inserting a time synchronization response packet into a packet stream corresponding to the output line code stream. In this way, the time synchronization network may be deployed without requiring the packet switching device to support time synchronization.01-26-2012
20130195123CLOCK RECOVERY OVER PROTECTED PACKET NETWORKS - A method and circuit for recovering a clock signal in a receiving station, wherein the receiving station receives packets carrying timing information” (TI) from a transmitting station over a packet switched network, the TI relating to a reference timing source located over the network. The method comprises the steps of: calculating over time, in the receiving station, a “TI Delay” variable based on a relative time difference between a timestamp assigned to a sample of a clock signal generated in the receiving station and the TI; upon detecting a Delay Deviation in the TI Delay, accumulating the Delay Deviation in an “Accumulated Deviation” variable; subtracting the Accumulated Deviation from the TI Delay; adjusting the frequency of the clock signal based on the TI Delay; and upon detecting that the Accumulated Deviation absolute value is smaller than a Zeroing Threshold, zeroing the Accumulated Deviation before subtracting it from the TI Delay.08-01-2013
20130195124TIMEBASE PERIPHERAL - A microcontroller has a timebase driven by a clock signal, wherein the timebase has a reset input and an output coupled with a comparator. The comparator is further coupled with a register and is operable to generate a synchronization output signal if the timebase matches the register value. The microcontroller further has a first multiplexer receiving the synchronization output signal from the comparator and further receiving at least one event signal generated by a unit other than the timebase, wherein the first multiplexer is operable to select either the synchronization output signal or the at least one event signal as a timebase synchronization output signal.08-01-2013
20120294318Method and System for Implementing Time Synchronization in Local Area Network (LAN) - A method and a system for implementing time synchronization in a local area network are disclosed, and the local area network includes a master system device (11-22-2012
20130202002Node Level Vectoring Synchronization - An apparatus for synchronizing a plurality of digital subscriber line access multiplexers (DSLAMs) comprising a reference clock configured to generate a reference clock signal, and an interface configured to transmit the reference clock signal to the DSLAMs, wherein each of the DSLAMs is configured to align its system clock with the reference clock.08-08-2013
20130094523TIME SYNCHRONIZATION METHOD AND SYSTEM, AND NODE DEVICE - The present disclosure discloses a time synchronization method. In the method, a first node sends a first time packet at a first time over a first working wavelength; a second node receives the first time packet at a second time. The first node sends a second time packet at a third time over a second working wavelength. The second node receives the second time packet at a fourth time; calculates an absolute time deviation between the second node and the first node according to the first time, the second time, the third time, the fourth time, a first signal transmission rate corresponding to the first working wavelength, and a second signal transmission rate corresponding to the second working wavelength, and synchronizes the local time between the second node and the first node. Further, a time synchronization system and a node device are disclosed.04-18-2013
20130208735CLOCK SYNCHRONIZATION USING MULTIPLE NETWORK PATHS - In a network device communicatively coupled to a master clock via a plurality of different communication paths, a clock synchronization module is configured to determine a plurality of path time data sets corresponding to the plurality of different communication paths based on signals received from the master clock via the plurality of different communication paths between the network device and the master clock. A clock module is configured to determine a time of day as a function of the plurality of path time data sets.08-15-2013

Patent applications in class Synchronizing

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