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398 - Optical communications

398001000 - FAULT RECOVERY

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Class / Patent application numberDescriptionNumber of patent applications / Date published
398005000 Spare channel or standby optical fiber 66
398003000 In a ring or loop 25
20130084063HITLESS PROTECTION FOR TRAFFIC RECEIVED FROM 1+1 PROTECTING LINE CARDS IN HIGH-SPEED SWITCHING SYSTEMS - A communication system includes a synchronous interface coupled to a switch fabric; cells for switching; and a 1+1 protection unit with a primary and back-up line cards.04-04-2013
20130084062HITLESS PROTECTION FOR TRANSMITTING TRAFFIC IN HIGH-SPEED SWITCHING SYSTEM - A system to provide hitless protection includes a primary line card with a synchronous interface, the primary line card processing traffic with cells and encapsulating the traffic into synchronous frames in a predetermined format; and a back-up line card with a synchronous interface, the back-up line card processing the traffic with the cells and encapsulating the traffic into the synchronous frames in the predetermined format, wherein each line card includes a buffer to align the traffic before transmission, wherein the cell information sent by the primary line card is passed to the back-up line card, and wherein the back-up line card follows the received information to send to the destination cell.04-04-2013
20100142940OPTICAL COMMUNICATION SYSTEM, OPTICAL RECEIVING TERMINAL, AND OPTICAL SIGNAL FAULT DETECTION METHOD - An optical communication system includes an optical transmission terminal including a first transmitter for transmitting an optical signal, and a second transmitter for transmitting information that indicates the first transmitter transmitting the optical signal; and an optical receiving terminal including an optical receiver for receiving the optical signal and the information transmitted from the first and second transmitter, respectively, a storage device for storing a power value of the optical signal monitored in response to receipt of the information transmitted from the second transmitter, and a fault detector for detecting fault of the optical signal by continuously monitoring a power value of the optical signal received by the optical receiver in comparison with the power value stored in the storage device.06-10-2010
20130089318Methods, Systems, and Computer-Readable Media for Providing Notification of a Power Failure - Methods, systems, and computer-readable media provide for notifying an optical line termination (OLT) of a power failure. According to embodiments, a method for notifying an OLT of a power failure is provided. According to the method, a notification of a power failure at an optical network termination (ONT) is received. In response to receiving the notification, power is retrieved from a dedicated power storage unit dedicated to providing power for the transmission of a dying gasp alarm. The dying gasp alarm is transmitted to the OLT utilizing at least a portion of the power from the dedicated power storage unit. The dying gasp alarm notifies the OLT of the power failure.04-11-2013
20130089317METHOD AND SYSTEM FOR HYBRID MULTI-LAYER MESH RESTORATION IN A COMMUNICATION NETWORK - In accordance with embodiments of the present disclosure, a method may include sorting potential optical layer link failures in a network in an increasing order of failed traffic amount. The method may further include, for each potential optical link failure in increasing order of failed traffic amount: determining the additional higher layer link capacity required on existing higher layer links associated with the potential optical link failure using higher layer restoration of the potential optical link failure; determining the additional optical layer capacity required for restoring the existing higher layer links associated with the potential optical link failure using optical layer restoration; and selecting one of the higher layer and the optical layer as a restoration layer for restoration of the existing higher layer links associated with the potential optical link failure based on the determined additional higher layer link capacity and the determined additional optical layer capacity.04-11-2013
20130089316METHOD AND ARRANGEMENTS FOR PROTECTION IN AN OPTICAL NETWORK - Method and arrangement for protecting optical network systems, the arrangement (04-11-2013
20130163982TRANSMISSION APPARATUS - A transmission apparatus interconnects a core network for making a communication by forming a connection and a metro network for m a communication by adding an address to data and by executing a forwarding process. The transmission apparatus includes a function of transmitting the data to the connection of the core network, to which an address of the metro network is made to correspond, and transfers the data to the connection of the core network, which is made to correspond to the address added to the data received from the metro network.06-27-2013
20130163981SIGNALLING IN OPTICAL TRANSMISSION NETWORKS - A connection-oriented optical network (06-27-2013
20100266274Method, System and Board Apparatus for Implementing Automatic Protection Switching Between Active Board and Standby Board - A method for implementing Automatic Protection Switching (APS) between an active board and a standby board includes detecting Synchronous Digital Hierarchy (SDH) data of main services, wherein the SDH data is received by a working port of the active board from a working line. If the SDH data received by the working port is detected as abnormal, SDH data of main services received by a protection port of the standby board is selected from a protection line, and service processing is performed for the SDH data.10-21-2010
20120087650SERVICE PROTECTION METHOD AND DEVICE BASED ON AUTOMATIC SWITCHED OPTICAL NETWORK - The present invention discloses a service protection method and device based on an automatic switched optical network (ASON), which are adapted to restoring a service when a fault occurs in the connection of the service. The method comprises: comparing a dynamic restoration lag time of the service with a protection switching lag time of the service; and starting a protection switching process to restore the service if the dynamic restoration lag time is greater than the protection switching lag time; and starting a dynamic re-routing process to restore the service if the protection switching lag time is greater than the dynamic restoration lag time. By the present invention, the reliability of the network is enhanced and the self-healing capacity of the ASON is improved.04-12-2012
20100027989Network Protection Switching Mechanisms and Methods of Network Protection - A network protection switching mechanism comprises a plurality of optical switches located at a plurality of nodes; a plurality of optical communication paths between said switches; switch based fault detectors located as part of at least two switches which generate detection results representative of the identification of a fault; switch based controllers located as part of said at least two switches; and internal switch-communication means between said fault detectors and said controllers which facilitate the transmission of detection results from said fault detectors to said controllers; wherein said controllers directly cause switching to an alternative optical communication path dependent upon the receipt of said detection results; whereby autonomous switch based protection without dependence on either inter-switch control communication or higher level network control communication is achieved.02-04-2010
20090148155OPTIMIZED CDR APPLICATION FOR VARIABLE DATA RATE SIGNALS IN SFPs FOR JITTER REDUCTION - Systems and methods for conditioning an optical signal are provided for applications which require management of both low and high-data-rates. Upon receipt of a data signal, a determination is made as to whether the data signal is a high or low-data-rate signal. If the data signal is a high-data-rate signal, a clock and data recovery circuit is activated along the data path. If the data signal is a low-data-rate signal, the clock and data recovery circuit is bypassed. When activated, the clock and data recovery circuit conditions the data signal to reduce jitter and other distortion effects which tend to produce larger detrimental effects as data rates increase.06-11-2009
20100254701 LINEAR PROTECTION METHOD OF THE OPTICAL NETWORK - The present invention discloses a linear protection method for an optical network, used for protecting a failed service path in the optical network, and the method comprises: setting priorities of services carried on service paths participating in linear protection of the optical network as service priorities; selecting, from the service paths participating in the linear protection, a service path of which the service priority is lower than that of the failed service path as a protection path, and bridge switching the service on the failed service path to the protection path. The present invention implements protection of service paths according to the priority of the service carried on the failed service path, and enhances the security of service paths.10-07-2010
20100124416Transmission apparatus - In a transmission apparatus, unlike in the conventional transmission apparatus, a protection switch is not arranged on the signal path, but a TSI having only the basic function performs the function of the protection switch as a substitute, a processing unit to perform the switching function at a low rate is artificially constructed on a TSI, the switch process of SONET protection type is artificially executed by the TSI, and a signal for controlling the TSI function is further controlled thereby to realize the protection switch function. The logic of switching at the main signal rate in addition to the conventional TSI function is deleted.05-20-2010
20090087178SELF-CONTAINED SECURE VIDEOCONFERENCING CONSOLE - Disclosed is a secure/non-secure bypass switch, including at least one input port for receiving signals; a control module for determining if a secure or a non-secure operating mode is selected; if a non-secure mode is selected, configuring at least one relay to route the signals through at least two fiber optic modems; and if a secure mode is selected, configuring the at least one relay to route the signals through an encryption device.04-02-2009
20110170856Optical transmission device - An optical transmission device includes a first optical output unit including a chip and outputting an optical signal having a predetermined wavelength according to a temperature, a second optical output unit including a chip of which a temperature is controlled independently of the chip of the first optical output unit and outputting an optical signal having a predetermined wavelength according to a temperature, a failure detecting unit detecting a failure of the chip in operation of the first optical output unit, a switching unit switching its operation to the chip of the second optical output unit whose output optical signal has a same wavelength as that of the optical signal of the chip in operation of the first optical output unit when the failure detecting unit detects the failure, and a transmitting unit transmitting the optical signal output from the chip of the second optical output unit.07-14-2011
20090257742Joint IP/optical layer restoration after a router failure - A method and system for providing joint IP/Optical Layer restoration mechanisms for the IP over Optical Layer architecture, particularly for protecting against router failure within such architecture, includes any one of plural node elements participating in the detection and restoration of the joint IP/Optical Layer architecture upon the failure of a router in one of the nodes. The plural node elements may include, but are not limited to, one of plural routers and an optical cross-connect.10-15-2009
20090103915Protocol-Less All-Optical 1+1 Bidirectional Revertive Linear Protection System - In an optical network a 1+1 bidirectional protection system is presented. Each node across a link has photodiodes to monitor the power of signals received by the node on receiving working and protection optical fibers and also optical switches connected to transmission working and protection optical fibers to modulate signals to its counterpart node across the link. When a node detects a fault in the receiving working optical fiber, not only does the node switch to the receiving protection optical fiber, but it also switches to the transmission protection optical fiber to signal the fault to the node across the link. The optical switches on transmission working and protection optical fibers allow the two nodes across the link to signal each other at a protocol-less or primary protocol level for the link to revert back to its initial state.04-23-2009
20110200322Flexible Branching Unit and System Including the Same - Fault tolerance may be achieved in a branched optical communication system such that a fault in one optical path may not affect optical signals coupled from a healthy optical path. In general, a flexible branching unit is configured, when adding and dropping channels, to select channels from a healthy path and not from the faulty path (e.g., a trunk path or a branch path) to prevent non-uniform channel loading on the trunk path after the branching unit. In this manner, a fault detected on the trunk path may not affect signals from the branch path and a fault detected on the branch path may not affect signals from the trunk path, thereby providing fault tolerance. A flexible branching unit may also be capable of adjusting the number and selection of channels that are added and dropped at the branching unit.08-18-2011
20100061720Provision of Alternative Communications Paths in a Communications Network - A method of processing data for computing alternative paths in an optical network (03-11-2010
20100061719Utilizing Optical Bypass Links in a Communication Network - Optical By-Pass (OBP) links may be created by adding wavelengths between nodes on the network. The OBP may extend between any pair of nodes on the network. Intermediate nodes on the OBP are transient nodes and simply forward traffic optically. An OBP extends between a pair of nodes and, unlike express links, is created in such a manner that it does not affect the previous allocation of resources on the network. This enables capacity to be added between pairs of nodes on the network to alleviate congestion at a portion of the network, without changing other traffic patterns on the network. This enables inclusion of an OBP to be deterministic and of linear impact on the network. The OBP links may be statically provisioned or created on demand. Optionally, the OBP links may be crated to coincide with PBB-TE tunnels on the network.03-11-2010
20090116833OPTICAL WAVELENGTH MULTIPLEXED TRANSMISSION APPARATUS - Each network device holds as a database parameters relating to the size of a factor of signal degradation of the device, and relays the parameters according to a path through which a signal passes. When each network device receives a relayed parameter, it accumulates the parameter of the device to the received parameter value, and transmits the result to the network device at the next stage. The network device on the terminating side of the path estimates the size of the degradation of the signals in the entire path using the received parameter, thereby determining the reachability as to whether or not a signal can be transmitted through the path.05-07-2009
20080279548METHOD AND APPARATUS FOR PROCESSING FAULT DEPENDENCY OF DIFFERENT LEVELS OF TANDEM CONNECTION MONITORING - A method for processing fault dependency of different levels of tandem connection monitoring is provided. The method comprises obtaining monitored coverage scopes of the different levels of tandem connection monitoring (TCM); locating a fault section according to an overlapping relationship between monitored coverage scopes of the at least two different levels of TCM at which the warnings are reported and performance degradation degrees of the at least two different levels of TCM, the fault section being located when warnings are reported in at least two different levels of TCM; and outputting location-related information that includes information of the fault section to a user.11-13-2008
20080304822Response to OTUk-BDI for OTN Interfaces to Restore Bidirectional Communications - In an OTN (Optical Transport Network), an OTN interface of a network element may receive a BDI (Backwards Defect Indicator) signal from a far end network element to which OTN frames are being transmitted. A BDI signal indicates the occurrence of a unidirectional failure in the transmission of OTN frames to which the far end network element responds by switching its routing to the network element. The OTN interface generates an AIS (Alarm Indication Signal) for its network element so that the network element switches network communication channels to the far end network element to ensure bidirectional switching upon a unidirectional failure.12-11-2008
20110229122RESTORATION SCHEME FOR AN OPTICAL NETWORK AND METHOD OF USING SUCH A SCHEME - A method of restoration for an optical network, the network comprising a plurality of nodes (09-22-2011
20100209099Network Restoration Under Link or Node Failure Using Preconfigured Virtual Cycles - The design of telecommunication networks is such that there is provision of end-to-end path protection to multiple demands under a single link or node failure in the networks. Restoration routes are provided on Preconfigured Virtual Cycles (PVC's), where each demand is assigned one restoration route and specific restoration wavelengths on a segment of one cycle. Multiple demands may share restoration wavelengths, and the number of restoration wavelengths may vary among the PVC links. First, a plurality of candidate PVC's are generated where each demand may be assigned to multiple candidates. Assignment of demands with common failure scenarios are allowed, under certain conditions, to the same PVC. Next, a set of PVC's is selected from among the candidates, while minimizing total reserved restoration capacity and ensuring that all demands are protected. Next duplicate assignments are eliminated. Finally, conflicts of wavelength assignments are resolved. The invention focuses primarily on optical networks.08-19-2010
20100034532Communications Network - The invention relates to a communications node (02-11-2010
20090324215ACTIVE/STANDBY SWITCHOVER METHOD AND DEVICE OF ASYNCHRONOUS BACKPLANE IN TRANSPORT NETWORK - An active/standby switchover device and an active/standby switchover method of an asynchronous backplane in a transport network are provided. A local oscillator clock is adopted to obtain a clock of a working path, so as to replace the clock of the working path tracked in a phase-locked loop mode. An active/standby switchover operation is realized by using the local oscillator clock, so that the implementation cost is greatly reduced, and the hysteresis problem of the phase-locked loop tracking clock during the active/standby clock switchover is eliminated, thereby effectively achieving the lossless switchover of services.12-31-2009
20100322618METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR PROVIDING VIRTUAL 1:N AUTOMATIC PROTECTION SWITCHING (APS) AND DYNAMIC, IN SERVICE CONFIGURATION CHANGE FOR OPTICAL NETWORK INTERFACE EQUIPMENT - The subject matter described herein includes providing virtual 1:N automatic protection switching and dynamic, in service configuration change for optical network interface equipment. According to one aspect of the subject matter described herein, a method for providing virtual 1:N automatic protection switching (APS) for optical network interface equipment is disclosed. The method includes configuring N optical network interface cards (ONICs) as working cards, each working card having sending and receiving optical interfaces, wherein N is an integer greater than 1. A single ONIC is configured as a protection card for providing N optical interfaces for providing redundant interface protection for each of the optical interfaces on the N working cards. In response to detecting a failure of one of the N working cards or a failure of one of the optical interfaces on one of the N working cards, optical networking communications that would have been sent to or received by the failed card are automatically sent and received using a protecting interface on the protection card that is associated with the failed card.12-23-2010
20110116787Simplified remote interface device and method for determining a failure at an optical fiber link terminated with a remote interface device - The invention relates to a remote interface device (05-19-2011
20110116786HOT-SWAPPING IN-LINE OPTICAL AMPLIFIERS IN AN OPTICAL NETWORK - An amplifier node, in an optical network, includes a first switch connected to a working path from which network traffic is received; a second switch connected to the working path to which the network traffic is transmitted; and two amplifiers that interconnect the first switch and the second switch, where the network traffic travels from the first switch to the second switch via a first amplifier. The amplifier node also includes a controller to receive an instruction to switch the network traffic from the first amplifier to a second amplifier that enables the first amplifier to be repaired; send, to the first switch and the second switch, another instruction to switch the network traffic from the first amplifier to the second amplifier; receive an indication that the network traffic is traveling via the second amplifier; and send a notification that the first amplifier can be repaired based on the indication.05-19-2011
20100098406METHOD AND APPARATUS FOR INTERCONNECTING A PLURALITY OF OPTICAL TRANSDUCERS WITH A WAVELENGTH DIVISION MULTIPLEXED OPTICAL SWITCH - In a WDM optical communication system that includes a plurality of nodes interconnected by communication links, a node is provided that includes a first plurality of transponders each generating and/or receiving an information-bearing optical signal at a different channel wavelength from one another. An optical coupling arrangement, which may include one or more reconfigurable optical switches, transfers the channel wavelengths between a link connected to the node and the first plurality of transponders. The arrangement is adaptable to reconfigure its operational state to selectively direct different ones of the channel wavelengths from the link to different ones of the transponders without disturbing the optical path through the node traversed by any other channel wavelengths. A communications and configuration arrangement is provided, which transfers data identifying the respective channel wavelengths at which the transponders operate from the transponders to the optical coupling arrangement. In response to the transferred data, the communications and configuration arrangement reconfigures the operational state of the optical coupling arrangement.04-22-2010
20090028548Operation and construction method of network using multi-rate interface panel - The present invention provides a network at a low cost with a reduced number of components and simple management among networks anticipated to become more and more complicated, the network being capable of quick pass change upon service addition/change and failure occurrence. Namely, the present invention realizes a network configuration unnecessary for replacement of interface panels upon pass change, by using a multi-rate compatible interface panel capable of freely changing a signal type to be processed, under control of an upper level operation.01-29-2009
20110262128MESH RESTORATION IN OPTICAL TRANSPORT NETWORKS - The present disclosure provides mesh restoration systems and methods with Optical Transport Network (OTN) links using a signaling and routing protocol, such as Optical Signaling and Routing Protocol (OSRP), Automatically Switched Optical Network (ASON), Generalized Multi Protocol Label Switching (GMPLS), and the like. The present invention includes an optical node, network, and method using the signaling and routing protocol for OTN lines of differing bandwidth granularities. The present invention utilizes OTN overhead for in-band signaling and may include capability for supporting SONET/SDH lines as well as OTN lines in the same system using the signaling and routing protocol.10-27-2011
20100166419TECHNIQUES FOR PROTECTING PASSIVE OPTICAL NETWORKS - A method for performing a protection in passive optical networks. The method comprises forming a protection maintenance link between an active optical line terminal (OLT) and a standby OLT; forming a synchronization link between the active OLT and the standby OLT; computing a base differential distance value; continuously measuring round trip time (RTT) values by the active OLT using the protection maintenance link; periodically sending at least RTT values calculated by the active OLT to the standby OLT over the synchronization link; and computing, by the standby OLT, a new RTT value based on at least a RTT value measured by the active OLT and a standby differential distance value, when a switch-over action is triggered, thereby allowing the standby OLT to serve optical network units (ONUs) in the PON without performing a ranging process.07-01-2010
20110064404Network Restoration Under Dual Failures Using Path Protecting Preconfigured Cycles - The design of optical telecommunication networks is such that there is provision of end-to-end path restoration to specified demands under up to two links or nodes failures. Restoration routes are provided on Path Protecting Preconfigured Cycles (PP-PCs), where each demand is assigned one or two restoration routes and restoration wavelengths on a segment of one cycle. Splitting of demand across multiple restoration routes is not allowed. All restoration routes and restoration wavelengths are predetermined where multiple demands may share restoration wavelengths without resorting to intermediate switching or wavelength conversions along restoration routes. First, numerous candidate PP-PCs are generated. Assignment of demands with common failure scenarios are allowed, under certain conditions, to the same PP-PC. Next, a set of PP-PCs is selected from among the candidates, while minimizing total reserved restoration wavelengths cost and ensuring that all demands are protected as required. Finally, conflicts of wavelength assignments are resolved.03-17-2011
20080298799GATEWAY DEVICE, OPTICAL NETWORK TERMINAL, AND PASSIVE OPTICAL NETWORK SYSTEM - In a broadband access network, calls can be kept active even when a telephone network fails. A voice gateway function captures callee telephone number information sent from a caller subscriber telephone to the telephone network and, when the telephone network fails, keeps the call active by retaining the connection between the caller and the callee. Furthermore, when the telephone network fails, the operation mode of the voice gateway and all ONTs is switched from an H.248 gateway mode to an SIP softswitch mode, allowing the voice gateway function to relay communication packets between ONTs and new call connections to be made in the broadband access network.12-04-2008
20110317994METHOD AND SYSTEM FOR AUTOMATIC LANE NEGOTIATION IN AN OPTICAL NETWORK - Systems and methods for distributing signals in an optical network are disclosed. In accordance with one embodiment of the present disclosure a method for distributing signals in an optical network comprises combining input signals into one or more output signals, determining, an availability status of optical lanes for carrying the output signals and distributing the output signals to optical transmitters associated with the optical lanes if the availability status indicates that the optical lanes are available. The method further comprises, transmitting the output signals as optical signals using the optical transmitters associated with the lanes that are available and determining that a previously available optical lane is not available for carrying the output signals, terminating distribution of the output signals to the optical transmitter associated with the lane that is not available and redistributing the output signals to the plurality of transmitters associated with the lanes that are still available.12-29-2011
20110317995PASSIVE OPTICAL NETWORK PROTECTION METHOD, SWITCHOVER CONTROL DEVICE, AND PASSIVE OPTICAL NETWORK PROTECTION SYSTEM - The present invention discloses a passive optical network (PON) protection method, a switchover control device, and a PON protection system. In embodiments of the present invention, a protection optical line terminal (OLT) is connected to optical links of at least two working OLTs through the switchover control device; when a working OLT or working optical link fails, the switchover control device replaces the working OLT through the protection optical link, thus ensuring smooth communication. In addition, by using the networking mode of multiple working OLTs and one protection OLT, the embodiments of the present invention greatly saves the networking cost and facilitates the application of the PON technology.12-29-2011
20090285574FLEXIBLE SHARED MESH PROTECTION SERVICES FOR INTELLIGENT TDM-BASED OPTICAL TRANSPORT NETWORKS - A system includes one or more active/working circuit groups to transfer information through a protection domain, the protection domain defined by a plurality of network devices and a plurality of links connecting the network devices between a start point and an end point; and a protection circuit group through the protection domain, the protection circuit group being disjoint from the one or more active/working circuit groups to provide shared protection for the one or more active/working circuit groups, where the protection circuit group is comprised of an individual protection circuit and where a capacity of the protection circuit group is dynamically adjusted based on a capacity of the one or more active/working circuit groups.11-19-2009
20110103792PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINAL - A transmission speed of a protection (backup) line using 1G-OLT unit and 1G-ONU unit is set to be lower than a transmission speed of a working (primary) line using 10G-OLT unit and 10G-ONU unit. A priority and band of each communication service in ONU are preset individually and separately every LLID for a working (primary) line and a protection (backup) line. When bands are allocated to the protection (backup) line, the band allocation is performed so as to secure a minimum number of bands of each communication service. A monitoring controller refers to a predetermined band information table according to an operation state of the working (primary) line or the protection (backup) line with respect to a downstream signal packet.05-05-2011
20100290778COMMUNICATION APPARATUS, APPARATUS ACTIVATION CONTROL METHOD, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM - [PROBLEMS] To certainly restore path information to its original status when a trouble occurs on a network. [MEANS FOR SOLVING PROBLEMS] After reactivation, an apparatus control part (11-18-2010
20120163797Apparatus and method for rerouting multiple traffics - The disclosure discloses an apparatus and method for rerouting multiple traffics. The apparatus includes a path computation unit and a traffic path incorporation unit, the path computation unit forwards a received uniform route computation notification message including multiple pieces of failed traffic connection information to the traffic path incorporation unit, and also forwards a route inquiry request transmitted from the head node of the fault traffic to the traffic path incorporation unit; the traffic path incorporation unit analyzes and detects the failed traffic connection information according to traffic incorporating and route inquiry statistic algorithm, and uniformly obtains and records the recovery route information from the path computation unit; when receiving the route inquiry request forwarded by the path computation unit, the traffic path incorporation unit is further configured to search the record according to the route inquiry request, and return the found corresponding recovery route information to the head node which requests the recovery through the path computation unit. The disclosure uses a incorporating and uniform route inquiry method, the resource loss of the path computation unit is reduced, and the efficiency of link restoration is improved.06-28-2012
20120163796DISTRIBUTED ELECTRICAL CROSS DEVICE, AND SYSTEM AND METHOD THEREOF FOR IMPLEMENTING SUB-NETWORK CONNECTION (SNC) CASCADE PROTECTION - The present invention discloses a distributed electrical cross apparatus, and a system and method for the distributed electrical cross apparatus implementing an SNC cascade protection. The apparatus includes a backboard and at least four single-boards integrated with electrical cross units, wherein the single-boards are inserted in the limited number of slots in the backboard, and these single-boards also set line-side service access units, client-side service access units and backboard access units. The present invention has both accessing of line-side services and accessing of client-side services in the same single-board, access and flexible scheduling of various services such as line-side services and client-side services and so on are implemented on the backboard with limited number of slots, and the function of the distributed electrical cross system processing various services is increased in the case of low cost.06-28-2012
20120237199OPTICAL NETWORK SYSTEM AND WDM APPARATUS - An optical network system that performs transmission of N:1 protection includes a node that includes transmission-side operating muxponders that multiplex client signals for every M-channel signal bundle and convert multiplexed signals into optical signals having different wavelengths, transmission-side optical couplers that branch the client signals into two channels of operating and redundant, transmission-side optical switches each selecting one channel from redundant signals as a redundant client signal, and a transmission-side redundant muxponder that performs a predetermined transmission-side process according to an accommodation mode set on the redundant client signal and then multiplexes the redundant client signals, converts the multiplexed signal into an optical signal having a wavelength different from that of the operating signal, thereby making the accommodation mode settable for each channel in an independent manner.09-20-2012
20120076488METHOD AND DEVICE FOR REALIZING OPTICAL CHANNEL DATA UNIT SHARED PROTECTION RING - A method and a device for realizing an optical channel data unit (ODU) shared protection ring (SPRing) are disclosed by the present invention. The method includes: A first ODU of a first service transmitted in an optical line is taken as a protection granularity, where the first ODU is an ODUk that is directly multiplexed to the optical line; the first ODU is monitored, and a monitoring result is obtained; when the monitoring result indicates that a failure occurs, a switching is performed through cross of a second ODU of the first service, where the second ODU is an ODUm that is multiplexed to the first ODU, and m is smaller than or equal to k. Through the embodiments of the present invention, a protection switching speed may be accelerated.03-29-2012
20100232782OPTICAL TRANSMISSION DEVICE, OPTICAL TRANSMISSION SYSTEM INCLUDING THE SAME, AND OPTICAL TRANSMISSION METHOD - An optical transmission device includes a wavelength multiplexing/demultiplexing unit, a plurality of transponders, an optical switch unit and a controller. The controller includes a table in which a plurality of items at least including priority order, a transmission label, a receiving label and a receiving label expected value correspond to the respective transponders. And the controller rewrites the transmission label of the transponder corresponding to the client device of the lower priority order than the priority order of the client device connected to the transponder of the irregular input, upon the optical signal provided by the wavelength multiplexing/demultiplexing unit to one of the transponders being irregular, and controls the label-changed transponder for which the transmission label has been rewritten so that the label-changed transponder provides the wavelength multiplexing/demultiplexing unit with the optical signal including the rewritten transmission label.09-16-2010
20090047012OPTICAL BYPASS METHOD AND ARCHITECTURE - This invention pertains to optical fiber transmission networks, and is particularly relevant to transmission of high volume of data and voice traffic among different locations. In particular, the improvement teaches improvements to an optical transport system to allow for efficient and flexible network evolution.02-19-2009
20130011132HYBRID PACKET-OPTICAL PRIVATE NETWORK SYSTEMS AND METHODS - The present disclosure provides hybrid packet-optical private network systems and methods for a private and dedicated multi-point Ethernet Private Local Area Network (EPLAN). The network systems and methods include a Layer 1 infrastructure service with the inclusion of reserved, dedicated packet switch capacity upon which clients can build their personal, private packet networks. In the systems and methods described herein, packet networking methods are not used to partition the isolated LAN connectivity. Instead, dedicated Ethernet Private LANs (EPLs) are defined between dedicated virtual switching instances (VSIs) that are defined, as necessary, within larger packet-optical switches. Each VSI is partitioned from the remainder of its packet switch fabric as a dedicated, private resource for a specific EPLAN. A packet network is then built by the customer on top of the private EPLAN bandwidth and operated as an isolated, private network with no influence by other carrier's network resources.01-10-2013
20130022349SYSTEMS AND METHODS FOR PROTECTION OF ADAPTATION LAYER IN A COMMUNICATION NETWORK - A method may include: (i) provisioning a first network-side interface of a first plug-in unit and a second network-side interface of a second plug-in unit as members of a network-side protection group, the first plug-in unit and the second plug-in unit integral to an adaptation layer network element; (ii) provisioning a first client-side interface of the first plug-in unit and a second client-side interface of the second plug-in unit as members of a client-side protection group; (iii) designating one of the first and second network-side interface as an active network-side interface of the network-side protection group; and (iv) designating one of the first second client-side interface as an active client-side interface of the client-side protection group, such that traffic ingressing on the active network-side interface may egress on the active client-side interface and traffic ingressing on the active client-side interface may egress on the active network-side interface.01-24-2013
20130129340DUAL OPTICAL ELECTRICAL CONVERSION MODULE - In an embodiment, a dual optical-electrical conversion (DOEC) module is described that includes an optical host interface, an optical network interface, and an integrated circuit. The optical host interface includes an optical transmitter and an optical receiver. The optical network interface includes an optical transmitter and an optical receiver. The integrated circuit conditions electrical signals communicated between the optical host interface and optical network interface. Optical signals received at and transmitted by the optical host interface may have different parameter requirements than optical signals received at and transmitted by the optical network interface, such as such as different wavelength parameters and/or fiber link length parameters.05-23-2013
20130101283DATA SYNCHRONIZATION METHOD AND SYSTEM, AND OPTICAL NETWORK UNIT - Embodiments of the present disclosure provide a data synchronization method and system, and an optical network unit. An ONU receives synchronization data that is transmitted by a first OLT through a GEM port corresponding to a predetermined GEM port ID or a logical link corresponding to a predetermined LLID, and stores the synchronization data. When a fault occurs on the first OLT or on a backbone optical fiber connected to the first OLT, the ONU transmits the synchronization data to a second OLT so that the second OLT recovers services according to the synchronization data.04-25-2013
20130121683APPARATUS AND METHOD FOR DETERMINING A LOCATION OF FAILURE IN A TRANSMISSION NETWORK - A plurality of transmission devices are communicably coupled to each other in a first transmission network. A first transmission device receives data from a second transmission device, and extracts, from the received data, attribute information including report-destination identification information identifying a third transmission device and routing information identifying a transmission route through which the data has been transmitted to the first transmission device via the second transmission device in the first transmission network. The first transmission device stores the extracted attribute information in a memory, and notifies, upon detecting a failure that has occurred in the first transmission network, the third transmission device of failure information that indicates an occurrence of the failure and includes the route information, based on the report-destination identification information included in the attribute information stored in the memory, through a second transmission network different from the first transmission network.05-16-2013
20130148956EQUALIZATION DELAY AGNOSTIC PROTECTION SWITCHING IN PROTECTED PASSIVE OPTICAL NETWORKS - Systems, methods and apparatus for operating an optical network terminal (ONT) in a passive optical network include maintaining an operational state in the passive optical network, estimating an upstream channel, adjusting equalization delay and physical layer frame offset values and switching from a backup mode to a primary mode of operation upon detecting a failure condition.06-13-2013
20130156416PACKET-OPTICAL COMBINED SWITCHING SYSTEM AND PROTECTION SWITCHING METHOD THEREOF - A protection switching method of packet-optical combined switching system in accordance with the inventive concept may include detecting whether or not an obstacle occurs in a packet path; performing a first protection switching using a preliminary path if an obstacle is detected from the packet path; generating an imaginary preliminary path using a preliminary resource of optical path when the first protection switching is failed; and performing a second protection switching using the imaginary preliminary path.06-20-2013
20130195439TRANSPARENT PROTECTION SWITCHING OPERATION IN A PON - The invention relates to a method for performing a switch operation between a first Optical Line Terminal OLT and a second OLT in a Passive Optical Network PON, said first and second OLTs being connected to a plurality of Optical Network Units ONUs through at least one splitter. The invention enables to avoid the detection of a timestamp drift error during protection switching operation by modifying the threshold of the detection in the second OLT.08-01-2013
20130195440WAVELENGTH MULTIPLEXING OPTICAL TRANSMISSION SYSTEM, TRANSMITTER, AND RECEIVER - When a failure occurs in operational transmission multiplexing transponders 08-01-2013

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