| Tellabs Operations, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120134435 | Method And Apparatus For Interference Suppression In Orthogonal Frequency Division Multiplexed (OFDM) Wireless Communication Systems - A method and apparatus for interference suppression in wireless communication systems, especially Orthogonal Frequency Division Multiplexed (OFDM) systems, is presented. The array apparatus includes a two-tier adaptive array system, which provides for both spatial diversity and beamforming at the uplink The adaptive array and includes sub-arrays spaced at a distance sufficient to provide spatial diversity and support beamforming or scanning A Direction of Arrival (DOA) of signals impinging upon the array can be calculated by comparing signals from sub-array elements. Each sub-array can be filtered or beamformed to provide high gain to desired signals received from the DOA (which may be a multipath signal) while simultaneously dampening-out undesired signals, such as co-channel interference (CCI) in the frequency band of operation. The DOA is also used for allocating frequency bins for data signals, such as in an OFDM system, to provide weighted guidelines for bin allocation to maximize received signal power. | 05-31-2012 |
| 20120124236 | METHOD AND SYSTEM FOR MULTI-LAYER NETWORK ROUTING - Each node of a telecommunications network determines a connection type attributes available for each signal type supported by the node. Each signal type represents a different connection routing layer within the telecommunications network. Adaptation costs involved in traversing from one connection routing layer to another connection routing layer in the node are calculated. The connection type attributes and adaptation costs are included in a link state advertisement broadcasted by each node in the telecommunications network. A route calculation is performed for a desired signal to determine a route through the telecommunications network for the signal. The route calculation takes into account the various connection type attributes, availability, and adaptation costs in determining the shortest route for the signal through the telecommunications network. | 05-17-2012 |
| 20120120951 | METHODS AND APPARATUSES FOR PATH SELECTION IN A PACKET NETWORK - Embodiments including methods, systems, and apparatuses for distributing, processing, and reacting to path information distributed via a service-agnostic packet fabric for the purpose of enabling path selection are disclosed. By configuring two ingress line cards to send path quality words to each other via the switch fabric, compare the path quality words, and determine whether to transmit traffic to an egress line card via the switch fabric based on the comparison of the path quality words, the embodiments enable a central switch fabric to be unaware of the paths that it carries, and enable both ingress and egress bandwidth of the switch fabric to be sized according to the facilities for which it is terminating. The switch fabric does not need to support working and protection paths simultaneously in some embodiments, allowing it to be scaled appropriately to termination facilities. | 05-17-2012 |
| 20120106970 | RECONFIGURABLE OPTICAL ADD DROP MULTIPLEXER CORE DEVICE, PROCEDURE AND SYSTEM USING SUCH DEVICE, OPTICAL LIGHT DISTRIBUTOR, AND COUPLING-RATIO ASSIGNING PROCEDURE - A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor is configured to receive an optical signal along a primary input of the reconfigurable optical add drop multiplexer core device and to distribute the received optical signal along a plurality of subtending outputs. The light combiner is configured to receive optical signals along a plurality of subtending inputs, to combine the received optical signals into a combined signal, and to output the combined signal. The add and drop ports in the first set function as add and drop ports, respectively, and the add and drop ports in the second set function as both add and drop ports, respectively, and as express ports connectable to another reconfigurable optical add drop multiplexer core device. | 05-03-2012 |
| 20120076013 | METHODS AND APPARATUS FOR SHARING COUNTER RESOURCES BETWEEN CoS/PRIORITY OR/AND BETWEEN EVC/VLAN TO SUPPORT FRAME LOSS MEASUREMENT - Embodiments including methods, apparatuses, and computer program products for calculating frame parameters for the purpose of measuring performance in a network based on the calculated frame parameters are disclosed. By automatically or manually provisioning at least two network elements in a star or other network topology to transmit and receive service frames (e.g., Loss Measurement Messages or Loss Measurement Responses), the embodiments enable network elements to share network resources, such as frame counters, thereby decreasing the number of frame counters needed to perform frame parameter measurements and increasing scalability for a given counter resource supported by a low cost network processor units. | 03-29-2012 |
| 20120069742 | Method and Apparatus for Network OAM Interworking - Network service providers have largely addressed the growth in demand for communications networks in two ways: employing faster and more robust communications protocols through equipment upgrades and increasing use of Operations, Administrations, and Management (OAM) procedures for improved network performance. Typically, OAM operations procedures used by a network protocol are unique to that protocol and are not compatible with other network protocols. Service providers with networks that use multiple communications protocols, such as networks using legacy and newly installed equipment, can have difficulty ensuring optimal performance due to non-compatible OAM operations. A method, and corresponding apparatus, for supporting OAM interworking between first and second communications protocols used in an interworking circuit of a communications network is disclosed. The method, or corresponding apparatus, allows network service providers to ensure optimal network performance in a manner that does not affect customer traffic, is transparent to customers, and can be seamlessly integrated into existing interworking network nodes. | 03-22-2012 |
| 20120063778 | Optical Add/Drop Multiplexer Using Integrated Optical Components - An optical add/drop multiplexer incorporates an integrated receiver module and an integrated transmitter which are interfaced to an intervening electrical network to provide an add/drop/pass-through functionality. The receiver module incorporates a wavelength demultiplexer which is in turn combined with optical/electrical converters PIN photodiodes, and amplifiers on a per wavelength basis to output a plurality of parallel electrical signals in response to a common optical input. The transmitter module combines an integrated plurality of drive circuits and lasers for converting a plurality of parallel input electrical signals to a plurality of optical signals, on a per wavelength basis, which in turn are coupled via an optical wavelength multiplexer to a common output optical fiber. The interconnected electrical network, ring mesh or tree, can provide a reconfigurable electrical add/drop interface to other portions of the network. | 03-15-2012 |
| 20120008493 | Bi-Directional Ring Network Having Minimum Spare Bandwidth Allocation and Corresponding Connection Admission Controls - The present invention provides for a method for reserving spare bandwidth for a link in a communication network including a plurality of links. The method provides for monitoring the volume of traffic routed through each link of the communication network. A single link failure for each link is then simulated and the volume of traffic which would be rerouted through each link for maintaining communication and the volume of traffic removed from each link are determined for each simulated single link failure. The difference between the volume of traffic which would need to be rerouted through each link and the corresponding volume of traffic removed from each link is then computed, and a maximum difference value is determined for each link for all simulated single link failures. An amount of spare bandwidth equivalent to the determined maximum difference is then reserved for each link. | 01-12-2012 |
| 20110317964 | Cooling method for CXP active optical transceivers - CXP is a telecommunications connector standard based on cage assemblies originally designed for copper cables. Optical transceivers dissipate more heat than copper cables, however, so cage assemblies designed for copper cables cannot remove heat adequately for proper transceiver operation. One embodiment of the inventive cage assemblies removes heat from an optical transceiver with a heat spreader, which protrudes through an aperture in a cage, and a compressible gap pad in thermal contact with the heat spreader. Inserting the optical transceiver into the cage places the transceiver in thermal contact with a heat spreader and pushes the heat spreader out of the cage, which, in turn, causes the gap pad to come into thermal contact with a heat pipe and/or a heat sink. The embodiment provide a low mechanical profile to support high-density circuit board configurations for high-density optical connectivity systems, such as used in Dense Wavelength Division optical networking. | 12-29-2011 |
| 20110307580 | PROCEDURE, APPARATUS, SYSTEM, AND COMPUTER PROGRAM FOR COLLECTING DATA USED FOR ANALYTICS - A procedure for operating a communication network including a network device that is in communication in the network with at least one user communication terminal and at least one server that server that provides content. The procedure includes receiving a message from one of the user communication terminal and the server, inserting at least one of an identifier of the user communication terminal and an identifier of the server in the message, and forwarding the message, including the at least one identifier inserted in the inserting, towards another of the user communication terminal and the server. A computer program, apparatus, and communication network also operate in accordance with the procedure. | 12-15-2011 |
| 20110293053 | TIME-DOMAIN EQUALIZATION FOR DISCRETE MULTI-TONE SYSTEMS - A multiple carrier communication system includes a primary impulse shortening filter that receives an output signal of an analog to digital converter and accepts coefficients. A secondary impulse shortening filter receives the output signal of the analog to digital converter, outputs an output signal, and passes coefficients to the primary impulse shortening filter. A reference signal generator outputs a reference signal. A comparator compares the output signal and the reference signal and outputs a resulting error signal. An adaptive processor computes coefficients for the secondary impulse shortening filter based on the error signal. | 12-01-2011 |
| 20110262135 | METHOD AND APPARATUS FOR INCREASING OVERALL AGGREGATE CAPACITY OF A NETWORK - Example embodiments of the present invention relate to increasing an aggregate capacity of a network without using a centralized switch fabric. A method and corresponding apparatus in an example embodiment of the present invention relates to increasing overall aggregate capacity of a switching system. The example embodiment includes a first switching shelf having a first predetermined aggregate capacity, and multiple second switching shelves having a second predetermined aggregate capacity. The second predetermined aggregate capacity is less than the first predetermined aggregate capacity. The example embodiment increases the overall aggregate capacity as a function of connections between the first switching shelf and the multiple second switching shelves. The shelves are interconnected with interconnection links and can be configured to connect to additional shelves as the switching system grows to larger sizes. Embodiments can increase capacity while reducing cost within a network node. | 10-27-2011 |
| 20110188852 | METHOD AND APPARATUS FOR FAST OPTICAL SIGNAL IMPAIRMENT EVALUATION - Having a fast method to perform impairment evaluation is useful for many networks. A method or corresponding apparatus according to an example embodiment of the present invention maintains a traffic engineering database of values representing characteristics of links in the network through storage of integer values representing advertised optical signal capabilities of links between the multiple optical nodes. The example embodiment determines a path through the network for optical wavelengths to be supported by the links represented in the database as a function of evaluating optical signal characteristics at each link along a possible path using the advertised optical signal capabilities and provides a selected path meeting an acceptable integrity of the optical wavelengths to a path establishment module to establish the path through the optical network. Example embodiments significantly reduce computational complexity associated with impairment evaluation and path selection in an optical network. | 08-04-2011 |
| 20110170416 | METHOD AND APPARATUS FOR LEAST COST ROUTING USING MULTIPLE PATH ACCUMULATED CONSTRAINTS - A cost of a path may not be the only factor in searching for a path solution in a network. For example, some applications are delay sensitive and require finding a path that does not exceed a latency constraint for the entire path. Accordingly, a method and corresponding apparatus for searching for a path solution in a network is provided that identifies combinations of partial paths that satisfy an end-to-end path constraint, compares attributes of the combinations of partial paths, prunes the combinations of partial paths based on results of the comparing to identify candidate combinations of partial paths, and selects a candidate combination of partial paths as the path solution. By pruning combinations of partial paths, considerable is saved compared to exhaustive comparing of every possible combination of partial paths and scalability is achieved. | 07-14-2011 |
| 20110150470 | PROCEDURE, APPARATUS, SYSTEM, AND COMPUTER PROGRAM FOR NETWORK PLANNING - A method, apparatus, system, and computer program, for operating a network planning tool. The method includes recognizing at least one predetermined criteria being satisfied or triggered, and learning at least one network attribute, to be used in subsequent network planning. Various types of network attributes can be learned, such as, e.g., network element parameters, site parameters, link parameters, demand parameters, optical parameters, general parameters, and networking parameters. Example attributes may specify, e.g., a maximum number of add/drop channels, at least one alarm threshold, a maximum number of sites per network ring, a maximum number of add/drop sites per ring, and a maximum ring circumference. Others can specify a maximum light path distance, a routing tendency, at least one grooming node, or the like. | 06-23-2011 |
| 20110132855 | STACKABLE CABLE TRAY - A cable tray is provided comprising a housing defining an interior portion, the housing having at least one positioned opening formed therein and also having plural, open ends in communication with the interior portion and the at least one positioned opening for passage of at least one cable therethrough. The housing is adapted to be coupled to at least one external surface, such that at least one of the plural, open ends substantially aligns with at least one open end of a housing of at least one further cable tray. | 06-09-2011 |
| 20110116571 | OFDM/DMT/DIGITAL COMMUNICATIONS SYSTEM INCLUDING PARTIAL SEQUENCE SYMBOL PROCESSING - A method of managing a signal over a symbol period includes supplying samples of the signal at beginning and end portions of the symbol period. The method further includes suppressing the supply of samples of the signal at a middle portion of the symbol period. | 05-19-2011 |
| 20110096670 | METHODS AND APPARATUSES FOR PERFORMING SWITCHING AND FOR EXCHANGING MANAGEMENT-REQUESTED SWITCHING MESSAGES BETWEEN NODES FOR 1:1 BIDIRECTIONAL VIRTUAL LOCAL AREA NETWORK (VLAN) PROTECTION WITHOUT USING Y.1731-BASED AUTOMATIC PROTECTION SWITCHING (APS) MESSAGES - To perform protection switching between tunnels in a network, Y.1731-based APS messages are often sent from a management system to nodes at the tunnels' end-points. If the management system is located near one node (local node) and far away from the other node (remote node), the APS message, which operates at the Ethernet service layer, travels to the remote node slower than traffic over the tunnels. This slower transmission time may prevent the remote node from performing a switch within a desired timeframe. The disclosed embodiments include a 1:1 bidirectional VLAN-based protection arrangement that accomplishes a 50 millisecond switching time without using Y.1731-based APS messages. The embodiments accomplish this by sending a switching command from the management system to the local node and modifying a message already traveling from the local node to the remote node to include a switching message that causes the remote node to perform the switch. | 04-28-2011 |
| 20110085571 | METHOD AND APPARATUS FOR ASSIGNING RESOURCES IN A NETWORK NODE - Achieving resource management within a network processing unit (NPU) can be challenging due to the NPU's fixed and limited instruction set. In the case of large mobile networks, contexts are dynamic, and each subscriber in the network consumes multiple hardware resources, where a central processing unit (CPU) is typically employed to program individual resources even though generally impractical in high-session rates. To avoid programming individual resources, an example embodiment of the present invention creates a group of resources depending on a category, the group being shared dynamically among subscribers when a subscriber is active in the network. The example embodiment may include a network service processor (NSP) located in a forwarding path, such that the NPU may operate in connection with the NSP to allocate NPU resources using a packetized interface. The example embodiment achieves resource management within the NPU without a host CPU's involvement and without statically delaying resources. | 04-14-2011 |
| 20110085440 | Reverse Notification Tree for Data Networks - Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches provide upstream messages indicating to upstream switching system that the downstream traffic arrived in tact and was properly handled. Upon this loss or failure of the upstream status message to an upstream switching system, an upstream switching system can reroute data traffic around a failed link or failed switch with a minimal amount of lost data. The upstream status message is conveyed from a downstream switching system to an upstream switching system via a reverse notification tree data pathway. | 04-14-2011 |
| 20110019996 | METHODS AND APPARATUS FOR OPTICAL NETWORKS - A chromatic dispersion compensation system for an optical transmission system incorporates circuitry which determines the length of an optical fiber extending between an output amplifier and an input amplifier. Based on fiber type, the total chromatic dispersion on the fiber is determined. Compensation can then be automatically implemented. | 01-27-2011 |
| 20100287405 | Method and apparatus for internetworking networks - Methods and apparatuses are disclosed for seamlessly combining an access ring aggregation network, e.g., a G.8032 network, and a core network, e.g., a Multi-Protocol Label Switching (MPLS) network. A link status is monitored between an interworking node and at least one peer node in a first network at an interface between the first network and a second network. Connectivity is maintained between the interworking node and the other interworking node(s) via the second network. Communications between the first and second networks are supported via at least one of the interworking nodes. Ring communications are supported among the interworking node, the other interworking node(s), and the peer node(s). End-to-end integration of two disparate networks according to presently disclosed techniques provides network designers and customers with flexibility in designing, operating, and maintaining networks. | 11-11-2010 |
| 20100287403 | Method and Apparatus for Determining Availability in a Network - Fault management and providing resilience against failures is an useful for many networks. Protection techniques are used to ensure that networks can continue to provide reliable service and to provide redundant capacity within a network to reroute traffic in presence of a failure. A method or corresponding apparatus according to an example embodiment of the present invention relates to determining availability in a network. The example embodiment calculates availability on a per demand basis for working, protection, and restoration paths among all demands in the network and reports the availability. The reported availability may be used to plan and suggest changes to the network or to recommend addition of equipment to improve the availability of the network while ensuring that service level agreements are satisfied. | 11-11-2010 |
| 20100278189 | Methods and Apparatus for Providing Dynamic Data Flow Queues - A network system and method capable of creating separate output queues on demand to improve overall network routing performance are disclosed. The network system, in one embodiment, includes a classifier, an egress queuing device and a processor. The classifier provides a result of classification for an incoming data flow in accordance with a set of predefined application policies. The egress queuing device is an egress per flow queue (“PFQ”) wherein a separately dedicated queue can be dynamically allocated within the egress PFQ in accordance with the result of classification. The processor is configured to establish a temporary circuit connection between the classifier and the egress queuing device for facilitating routing process. | 11-04-2010 |
| 20100272441 | Methods and apparatus for performing directionless and contentionless wavelength addition and subtraction - In today's reconfigurable optical add/drop multiplexer (ROADM) based optical node, ROADMs multiplex (and demultiplex) colored optical signals to form wavelength-division multiplexed (WDM) signals. Transponders connected to the ROADMs' add/drop ports convert noncolored optical signals to colored optical signals (and vice versa). Dedicating transponders to given ports degrades the node's ability to route around network failures. Example embodiments of the invention include an optical node and corresponding method for routing optical signals within an optical node that compensate for this inflexibility. The optical node may include two ROADMs to transmit respective WDM signals onto at least two internode network paths and a routing module that can direct channels of the same wavelength along different internode network paths. Advantageously, a transponder may transmit (receive) different signals at the same wavelength to (from) different network node interfaces within the optical node, thereby improving the optical node's ability to route around network failures. | 10-28-2010 |
| 20100260053 | PROCEDURES, SYSTEMS, APPARATUSES, AND COMPUTER PROGRAMS FOR PERFORMANCE MONITORING OF A PACKET CONNECTION - Procedures, systems, apparatuses, and computer programs are disclosed for performance monitoring of a packet connection. In example embodiments, data is added to a performance monitoring packet at a network element, and the performance monitoring packet is then forwarded to an analysis element. Analysis of the data contained in performance monitoring packet may thereby be conducted at a location other than the receiving interface. | 10-14-2010 |
| 20100244913 | Method and appartus for exchanging data between devices operating at different clock rates - Source-synchronous communications between networked devices can be hindered by differing clock rates and data interface formats among the devices. By implementing a plurality of clock converters, a data interface format of a transmitting device is converted to a data interface format compatible with a receiving device. The clock converters provide a clock signal based on the source-synchronous data clock, and having a phase controlled with respect to an associated data signal. As a result, data exchange between devices operating at different clock rates is made possible. | 09-30-2010 |
| 20100232783 | OPTICAL CHANNEL INTELLIGENTLY SHARED PROTECTION RING - An optical ring network has one or more working wavelengths and multiple protection wavelengths adapted to support the working wavelength(s). Routing tables may be used in network nodes to assign traffic of a failed working wavelength to a protection wavelength. The protection technique may be applied to networks employing, for example, Dense Wave Division Multiplexing (DWDM). | 09-16-2010 |
| 20100232416 | Method and System for Multi-Layer Network Routing - Each node of a telecommunications network determines a connection type attributes available for each signal type supported by the node. Each signal type represents a different connection routing layer within the telecommunications network. Adaptation costs involved in traversing from one connection routing layer to another connection routing layer in the node are calculated. The connection type attributes and adaptation costs are included in a link state advertisement broadcasted by each node in the telecommunications network. A route calculation is performed for a desired signal to determine a route through the telecommunications network for the signal. The route calculation takes into account the various connection type attributes, availability, and adaptation costs in determining the shortest route for the signal through the telecommunications network. | 09-16-2010 |
| 20100192003 | Method and apparatus for supporting client data transport with timing transparency - Clock recovery is used in a variety of communications network applications to enable nodes using different clocks to operate in an effectively synchronized manner. Example embodiments of the present invention include an apparatus and corresponding method for supporting client data transport with timing transparency and require neither a common clock to be available at both the ingress and egress sides of the connection nor overhead bytes to recover a client clock. Rather, client traffic clock recovery may be performed in example embodiments of the present invention entirely in the egress data path using the client data received from the ingress side after removing the clients signal from a higher level carrier signal. | 07-29-2010 |
| 20100183003 | METHOD AND APPARATUS FOR HORIZONTALLY SLICING A MULTI-STAGE SWITCH FABRIC - A method and apparatus are provided for horizontally slicing a multi-stage switching fabric having transmission inputs and transmission outputs to and from the switch fabric. The switching fabric includes switch elements arranged in at least first and second stages, each switch element having element inputs and outputs with each switch element being configured to join one of the element inputs with an associated one of the element outputs. The switch fabric includes a first logic device that contains a stage-1 subset of the switch elements that is arranged within, and configured to operate as part of, the first stage. The first logic device also contains a stage-2 subset of the switch elements arranged within, and configured to operate as part of, the second stage. The switch fabric includes a second logic device that contains a stage-1 subset of the switch elements that is arranged within, and configured to operate as part of, the first stage. The second logic device also contains a stage-2 subset of the switch elements that is arranged within, and configured to operate as part of, the second stage. The first and second logic devices are physically discrete from one another. | 07-22-2010 |
| 20100133633 | BEAM STEERING ELEMENT WITH BUILT-IN DETECTOR AND SYSTEM FOR USE THEREOF - An all-optical cross-connect switching system provides optical switching that may reduce processing requirements by three orders of magnitude over conventional techniques by associating at least one optical detector with an optical beam steering element. In one embodiment, a first beam steering element, having a reflective surface in optical association with a first optical fiber array, and a second beam steering element, having a reflective surface in optical association with a second optical fiber array, are optically arranged to direct an optical beam from a first optical fiber in the first optical fiber array to a second optical fiber in the second optical fiber array. The optical detector provides information about a first position of the optical beam on the second beam steering element. Based on this information, the angle of the first beam steering element may be adjusted to cause the optical beam to change to a second position on the second beam steering element. | 06-03-2010 |
| 20100091793 | MAX-MIN FAIR NETWORK BANDWIDTH ALLOCATOR - Allocation of an amount of available bandwidth among a plurality of users of a computer network is provided. Each user has a maximum allocation of bandwidth. Tier information of a plurality of tiers is accessed. In the tier information, users are grouped according to maximum allocation. Tier information includes a breakpoint value of each tier. The available bandwidth is allocated in one example embodiment by (1) allocating the maximum allocations to users in tiers with breakpoint values less than or equal to the amount of available bandwidth, and (2) allocating remaining available bandwidth in a fair manner among remaining users, which are users in tiers with breakpoint values greater than the amount of available bandwidth. The breakpoint value of at least one tier is a minimum amount of bandwidth that must be allocated in a Max-Min fair manner among the plurality of users such that each user in the tier receives its maximum allocation of bandwidth. | 04-15-2010 |
| 20100054263 | MULTICHANNEL RING AND STAR NETWORKS WITH LIMITED CHANNEL CONVERSION - A ring communication network according to an embodiment of the present invention includes a plurality of nodes in which a single one of the nodes is configured for full channel conversion and the remaining nodes, other than the single node, are configured for no channel conversion. Links with no more than W channels couple the nodes. The ring communication network also may include N nodes and links connecting the nodes for carrying data in W channels such that N≧2 log | 03-04-2010 |
| 20100042989 | Method and apparatus for simplifying planning and tracking of multiple installation configurations - When planning and maintaining a network, it may be very difficult for a network provider to organize variations of equipment rack installations at several different sites. Present methods of planning installation configurations in a network involve planning the same equipment installation configuration at all sites, planning a limited number of variations, or planning multiple variations but, with difficulty, tracking and changing configurations. A method or corresponding apparatus in an example embodiment of the present invention provides a tool for simplifying the planning of multiple network element installation configurations at multiple sites within a network. The benefits include fewer required truck rolls, resulting in reduced costs before and after deployment of installation configurations. In one embodiment, the disclosed planning tool allows users to access and change generic installation configurations according to customizable options to allow users to produce and store customized templates of multiple network element installation configurations. | 02-18-2010 |
| 20100042390 | Method and apparatus for designing any-to-any optical signal-to-noise ratio in optical networks - Optical regeneration is expensive to implement and maintain. A method or corresponding apparatus in an example embodiment of the present invention enables a user to plan an optical regeneration in a network with a reduction of optical regeneration compared to unplanned deployment. An optical regeneration planning tool according to an example embodiment of the present invention can graphically display a representation of a network topology with optical regeneration sites and enable the user to plan optical regenerations at a subset of the sites as a function of characteristics of models of optical network elements and paths within the network topology. Through use of the optical regeneration planning tool, a service provider can save on network deployment and future servicing of optical regeneration equipment. | 02-18-2010 |
| 20100040366 | Method and apparatus for displaying and identifying available wavelength paths across a network - Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network. Consequently, service providers using the tool can keep performance rates high and costs low. | 02-18-2010 |
| 20100040365 | Method and apparatus for planning network configuration in an optical network - Optical regenerators and amplifiers are expensive to implement and maintain. A method or corresponding apparatus in an example embodiment of the present invention relates to an optical planning tool that plans an optical network configuration by determining a plurality of costs for maintaining signal strength in corresponding network configurations including (i) a configuration of regenerators, (ii) a configuration of pre- or post-amplifiers, and (iii) a configuration of pre- and post-amplifiers in candidate locations and regenerator modules. The candidate locations for placing pre- or post-amplifiers are determined based on loss in each span, expected traffic patterns, and proposed regeneration locations along paths of expected traffic. The regeneration modules are located in locations determined based on the candidate locations. The example embodiment selects a configuration from among the network configurations as a function of the plurality of costs, helping reduce the cost of network deployment. | 02-18-2010 |
| 20100034499 | Methods and Apparatus to Make Substantially Uniform Losses in Optical Cross Connects - A method for cross connecting optical signals includes using a common beam steerer to direct a set of optical signals from a set of input ports to a set of output ports. The method further includes adjusting a curvature of the common beam steerer so that paths of the optical signals have substantially the same effective path length. | 02-11-2010 |
| 20090290507 | SYSTEM AND METHOD FOR PLANNING COMMUNICATION SYSTEMS - A method for planning a multi-phase network includes storing initial parameter values for parameters associated with first and second growth phases in a multi-phase network plan, wherein each of the first and second growth phases is characterized by sets of the parameters. The method also includes calculating an initial growth scenario including the first and second growth phases based on the initial parameter values, and adjusting a value for at least one of the parameters to produce a modified parameter value. The method further includes automatically calculating a new growth scenario based on the modified parameter value and at least a portion of the initial parameter values, and displaying the new growth scenario. A computer readable medium for implementing the method described herein is also provided. | 11-26-2009 |
| 20090287480 | Method and apparatus for low bit rate speech coding detection - To increase channel capacity, mobile phone carriers have deployed speech coders, such as Advanced MultiBand Excitation coding (AMBE), in networks to reduce the bit rate of each call. One undesired consequence of employing such speech coders is that the voice quality can be much worse as compared to higher bit-rate speech coders. A method or corresponding apparatus in an example embodiment of the present invention performs voice quality enhancement transparently within a network by detecting use of a coder applying rate reduction to a speech signal and known to have an adverse effect on a coded speech signal. Upon detection of the use of such coder, the coded speech signal is corrected based on components introduced into the coded speech signal due to the rate reduction. As a result of applying the voice quality enhancement, adverse effects of speech coders can be reduced, while maintaining high quality voice signals. | 11-19-2009 |
| 20090285585 | Method and apparatus for polarization stabilization in optical receivers with complex modulation formats - High optical communication rates are making their way into networks initially designed for 10 Gigabits per seconds (Gbps). These higher rates of 40 Gbps and higher have shorter signaling periods and are more susceptible to differential group delay (DGD). A method and corresponding apparatus in an example embodiment of the present invention compensates for polarization state sensitivity of a receiver by determining a performance metric relating to an error rate due to transmission and reception of a modulated optical signal in a medium introducing DGD. Based on the performance metric, a control vector is determined to control a polarization state of the modulated optical signal. The control vector is applied to a polarization effecting device to compensate for the DGD and the polarization state sensitivity of the receiver. Communication rates of 40 Gbps and higher can be used in transmission mediums that introduce DGD through use of embodiments presented. | 11-19-2009 |
| 20090257455 | Method 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 |
| 20090252497 | Method and apparatus for compensating for polarization mode dispersion (PMD) - Current optical networks are engineered to handle amplifier noise and chromatic dispersion. Polarization mode dispersion occurs in optical networks due splitting of the light energy of a pulse propagating in a fiber into two modes. Compensating for polarization mode dispersion is a difficult and expensive task and hence only few commercial systems have been deployed to deal with this issue. A polarization mode dispersion compensation module according to an example embodiment of the present invention compensates for polarization mode dispersion by determining a performance metric related to an error rate of an optical signal in at least one polarization mode in a filtered state. Based on the performance metric, a control vector is determined to control the optical signal in the at least one polarization mode in the filtered state. The control vector is then applied to a polarization effecting device to compensate for polarization mode dispersion. | 10-08-2009 |
| 20090232447 | Methods and apparatus for constructing large wavelength selective switches using parallelism - Optical networks are increasingly employing optical network nodes having multiple interfaces to allow a node to direct optical signals received at any interface to any other interface connected to the node. Constructing a larger wavelength selective switching (WSS) module used in such a node can be complex and expensive. A method an apparatus for constructing a large WSS using parallelism is provided. In example embodiments, a larger WSS may include multiple parallel non-cascaded smaller WSSs and an optical coupler configured to optically couple the multiple parallel, non-cascaded smaller WSSs. This technique may be used to construct both N×1 and 1×N WSSs. Because the technique employs multiple parallel, non-cascaded WSSs, all inputs of a larger N×1 WSS and all outputs of a larger 1×N WSS are available receive or transmit external signals rather than being rather than being unavailable due to, for example, cascading smaller WSS devices together. | 09-17-2009 |
| 20090174561 | System and Method for Transmitting Security Information Over a Passive Optical Network - An optical network terminal (ONT) includes an input device coupled to at least one sensing device mounted in a structure, and an output coupled to a passive optical network (PON). The ONT also includes a processor programmed to receive security information from the input device, determine if an alarm condition exists using the security information, and transmit an alarm to the output based on the determination. The processor is programmed to detect an open circuit between the sensing device and the ONT, and to generate an alarm if an open circuit is detected. The processor is also programmed to receive information from a keypad located remotely from the ONT. The keypad is utilized to program the ONT from the remote location. | 07-09-2009 |
| 20090147777 | Reverse Notification Tree for Data Networks - Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches provide upstream messages indicating to upstream switching system that the downstream traffic arrived in tact and was properly handled. Upon this loss or failure of the upstream status message to an upstream switching system, an upstream switching system can reroute data traffic around a failed link or failed switch with a minimal amount of lost data. The upstream status message is conveyed from a downstream switching system to an upstream switching system via a reverse notification tree data pathway. | 06-11-2009 |
| 20090142070 | Methods and apparatus for supporting fiber span loss and dispersion measurements in the presence and absence of dispersion compensation elements - An example embodiment of the invention includes a method and apparatus for supporting fiber span loss and dispersion measurements in the presence or absence of dispersion compensation elements (DCE). The technique may be used to configure a network link by accessing an optical signal at an ingress side of a connection point for a DCE coupling an egress side of a fiber span at the ingress side of the DCE to an optical amplifier at a connection point for an egress side of the DCE. The technique may include determining chromatic dispersion of the fiber span based on the optical signal and reporting information associated with chromatic dispersion. As a result, the technique may be used, for example, during initial system installation when user data signals and the DCE are not present as well as after the network begins carrying user traffic and after a DCE has been installed. | 06-04-2009 |
| 20090135735 | Method and apparatus of RTP control protocol (RTCP) processing in real-time transport protocol (RTP) intermediate systems - Media processing of real-time protocol (RTP) packets used in time sensitive applications makes efficient use of network resources, e.g., by dropping or resizing the packets, but hinders measuring and reporting end-to-end reception quality. Because media processing causes a difference between what is sent and received, end-to-end reception quality cannot be measured validly without accounting for this difference. Accordingly, a method and corresponding apparatus are provided to track changes to RTP packets of an RTP session caused by media processing, modify RTP packet information of the RTP packets based on the tracked changes, correct RTP control protocol (RTCP) packets corresponding to the RTP session based on the tracked changes, the corrected RTCP packets being a measure of the end-to-end reception quality of the RTP session, and report the end-to-end reception quality of the RTP session by forwarding the corrected RTCP packets. Thus, end-to-end reception quality can be validly measured and reported. | 05-28-2009 |
| 20090135724 | Method and apparatus of RTP control protocol (RTCP) processing in real-time transport protocol (RTP) intermediate systems - Media processing of real-time protocol (RTP) packets used in Voice over Internet Protocol (VoIP) and other time sensitive applications makes efficient use of network resources, e.g., by dropping or changing the size of certain packets, but hinders measuring and reporting end-to-end reception quality. Because media processing changes RTP packets between a sender and receiver, causing a difference between what is sent and received, end-to-end reception quality cannot be measured validly without accounting for these changes. Accordingly, a method and corresponding apparatus are provided to track changes to RTP packets of an RTP session caused by media processing of the RTP packets, modify RTP packet information of the RTP packets based on the tracked changes, correct RTP control protocol (RTCP) packets corresponding to the RTP session based on the tracked changes, the corrected RTCP packets being a measure of the end-to-end reception quality of the RTP session, and report the end-to-end reception quality of the RTP session by forwarding the corrected RTCP packets. | 05-28-2009 |
| 20090132260 | Method and Apparatus for Improving the Quality of Speech Signals - Methods and apparatus are disclosed to extend the bandwidth of a speech communication to yield a perceived higher quality speech communication for an enhanced user experience. In one aspect of the invention, for example, methods and apparatus can be used to extend the bandwidth of a speech communication beyond a band-limited region defined by the lowest limit and highest limit of the frequency spectrum by which such speech communication is otherwise characterized absent such bandwidth extension. In another aspect of the invention, for example, methods and apparatus can be used to substitute for corrupt, missing or lost components of a given speech communication, or to otherwise enhance the perceived quality of a speech communication, by extending the speech communication to include one or more artificially created points within the region defined by the lowest limit and highest limit of the frequency spectrum by which such speech communication is characterized. The result is a speech communication that is perceived to be of higher quality. The various aspects of the present invention can be applied, for example, to network devices or to end-terminal devices. | 05-21-2009 |
| 20090129582 | Communication system tonal component maintenance techniques - An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones or silence, a joint voice activity & DTMF activity detector (JVADAD) may be used. The overall average noise-to-signal ratio (NSR) of the input signal is estimated in the overall NSR estimator, which estimates the average noisy signal power in the input signal during speech activity and the average noise power during silence. Two indirect power measures are performed for each band, measuring a short-term power and a long-term power. The power estimation processes are adapted based on the signal activity indicated by the JVADAD. A NSR adapter adapts the NSR for each frequency band based on the long-term and short-term power measures, the overall NSR and the signal activity indicated by the JVADAD. The NSR adaptation may then be performed. The gain computer utilizes these NSR values to determine the gain factors for each frequency band. The gain multiplier may then perform the attenuation of each frequency band. Finally, the processed signals in the separate frequency bands are summed up in the combiner to produce the clean output signal. In another embodiment of the present invention, a method for suppressing noise is presented. An alternative embodiment of the present invention includes a method and apparatus for extending DTMF tones. Yet another embodiment of the present invention includes regenerating DTMF tones. | 05-21-2009 |
| 20090121788 | SYSTEM AND METHOD FOR SELF-CANCELLATION OF NTH-ORDER INTERMODULATION PRODUCTS - A method for reducing distortion in a nonlinear device whereby n | 05-14-2009 |
| 20090080331 | MODELING PACKET TRAFFIC USING AN INVERSE LEAKY BUCKET - An apparatus, method, and computer program of modeling packet traffic in terms of Leaky Bucket parameters. The Leaky Bucket parameters are tested based on conformance of packet traffic. If a result of the testing is nonconformance of the packet traffic, one or more of the Leaky Bucket parameters is modified such that the packet traffic is conforming. The one or more modified Leaky Bucket parameters is stored in a computer-readable storage medium. | 03-26-2009 |
| 20090046572 | Shared protection method and apparatus for reconfigurable optical add-drop multiplexer (roadm) based mesh networks - Example embodiments of a method and corresponding apparatus for sharing protection resources in a reconfigurable optical add-drop multiplexer (ROADM) based mesh network are presented. The use of dedicated 1+1 methodologies for protection in a mesh network is reliable, but requires a large amount of equipment redundancy, as well as a large associated cost. According to the embodiments of the present method and apparatus, the total number of protection transponders needed to support single failures in a mesh network is reduced by implementing a preconfigured protection cycle (p-cycle) in the mesh network and configuring nodes along the p-cycle to share protection transponders. Accordingly, the embodiments of the present method and apparatus allow for reliable protection against single failures while lessening the amount of equipment redundancy and reducing the associated cost. | 02-19-2009 |
| 20090028500 | SIGNAL INTERCONNECT INCORPORATING MULTIPLE MODULAR UNITS - An interconnect element incorporates a plurality of smaller, substantially identical, interconnect modules. Multiple identical elements can in turn be combined to form larger interconnect networks. Signal paths in the elements can be implemented with optical fibers or electrical conductors. | 01-29-2009 |
| 20090028354 | Echo Canceller Employing Dual-H Architecture Having Split Adaptive Gain Settings - An echo canceller circuit is set forth. The echo canceller circuit includes a digital filter having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated during the call using a Means Squares process. A tap energy detector is also employed. The tap energy detector identifies and divides groups of taps having high energy from groups of taps having low energy. The high energy tap groups are smaller in number than the low energy tap groups. The high energy tap groups are adapted separately from the low energy tap groups using the Least Squares process. Still further, the high energy tap groups may be adapted using an adaptive gain constant a while the low energy tap groups are adapted using an adaptive gain constant a′, wherein a>a′. | 01-29-2009 |
| 20090024387 | COMMUNICATION SYSTEM NOISE CANCELLATION POWER SIGNAL CALCULATION TECHNIQUES - In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal. | 01-22-2009 |
| 20090023309 | CONFIGURABLE PRINTED CIRCUIT BOARD - According to an example embodiment of the invention, a configurable printed circuit board (PCB) includes one or more separable portions for supporting modules for interfacing with the PCB. The separable portions extend from an edge portion of a main body of the PCB, and are disposed between the main body of the PCB and a protective portion. A scored portion is provided at a boundary between the main body of the PCB and the separable portions, the separable portions being separable by being broken off from the main body of the PCB at the scored portion. According to an example embodiment of the invention, a method of configuring a PCB having one or more separable portions of the PCB includes securing the PCB and separating the one or more separable portions of the PCB from another portion of the PCB. | 01-22-2009 |
| 20090022216 | SPECTRALLY CONSTRAINED IMPULSE SHORTENING FILTER FOR A DISCRETE MULTI-TONE RECEIVER - A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response. | 01-22-2009 |
| 20090016384 | Method and apparatus for distributing synchronization status messages over a Resilient Packet Ring (RPR) - Packets used for distributing timing information over a Resilient Packet Ring (RPR) are generated by encoding Synchronization Status Messaging (SSM) messages into IEEE 802.3ah OAM packets (or any other OAM packets, such as those defined in ITU Y.1731). Information indicating the direction that each message is to be transmitted around the RPR ring is also encoded in the packets in either the spare bits of the SSM messages or in the Type-Length-Value (TLV) bytes of the IEEE 802.3ah OAM packets or Y.1731 OAM packets. RPR protection is disabled for the packets carrying the SSM messages and the packets are transmitted to adjacent network nodes in the directions specified by the information encoded in the messages. Information encoded in received packets specifying timing quality and direction of the received messages is observed and compared to determine which timing information included in the messages to use for clock timing. | 01-15-2009 |
| 20090003421 | TIME-DOMAIN EQUALIZATION FOR DISCRETE MULTI-TONE SYSTEMS - A multiple carrier communication system includes a primary impulse shortening filter that receives an output signal of an analog to digital converter and accepts coefficients. A secondary impulse shortening filter receives the output signal of the analog to digital converter, outputs an output signal, and passes coefficients to the primary impulse shortening filter. A reference signal generator outputs a reference signal. A comparator compares the output signal and the reference signal and outputs a resulting error signal. An adaptive processor computes coefficients for the secondary impulse shortening filter based on the error signal. | 01-01-2009 |
| 20080310437 | Method and apparatus for carrying unknown traffic over a resilient packet ring (RPR) without flooding - A method and corresponding apparatus allows unknown packet traffic, such as Ethernet traffic, to be carried on a Resilient Packet Ring (RPR) network without flooding the traffic on the RPR network. Modules in a station of the ring network compare a destination address in a packet traffic signal with known addresses and associate an identifier of a tunnel in the ring network with the packet traffic signal based on the comparison. The modules then associate with the packet traffic signal an identifier of a destination station in the ring network that corresponds to the identifier of the tunnel and forward the packet traffic signal to the destination station via the tunnel. By transmitting the packet traffic via tunnels instead of flooding the RPR network, spatial reuse may be implemented allowing the network to support a higher volume of traffic. | 12-18-2008 |
| 20080298483 | Apparatus and method for symbol alignment in a multi-point OFDM/DMT digital communications system - A multi-point communications system is set forth herein. The communications system comprises a head end unit disposed at a primary site and a plurality of receivers disposed at remote sites. The head end unit includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are transmitted in periodically occurring formatted symbol frames. The cyclic prefix includes a predetermined periodic signal superimposed thereon. The receivers receive the OFDM/DMT symbols over a subset of the predetermined number of bins from the transmission medium and use the superimposed signals to attain symbol alignment. Preferably, the superimposed signal is an impulse signal that varies in polarity throughout the transmission cycle and which is superimposed on one or more symbols occurring during a cyclic prefix of the formatted symbol frames. In accordance with a further aspect of the present invention, the receivers apply a predetermined incremental phase shift to received samples corresponding to the received OFDM/DMT symbols to thereby compensate for phase shifts resulting from the cyclic prefix. The multi-point communications system may include a similar system for aligning symbols transmissions from a remote service unit having a transmitter. Such a system includes a plurality of remote service units each including a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. Each of the plurality of remote service units is operable in a symbol alignment mode in which the transmitter transmits a broad band periodic signal. The head end unit includes a receiver for receiving the OFDM/DMT symbols, including the broad band periodic signal, from the transmission medium. The head end unit uses the time position of the broad band periodic signal to align the symbol transmissions of the remote service unit with other ones of the remote service units. | 12-04-2008 |
| 20080298239 | METHOD AND APPARATUS TO PROVISION NETWORK ROUTES - A method to provision routes in a network having a plurality of nodes includes receiving a designation of a primary source node, determining possible destination nodes from the designated source node and outputting information indicating the possible destination nodes. The method further includes receiving a designation of a destination node from among the possible destination nodes and updating information regarding optical characteristics based on a route from the source node to the designated destination node and outputting information related to the updated optical characteristics. | 12-04-2008 |
| 20080294989 | Alarm correlation system - Network applications rely on ever-increasing diverse and complex transport service mechanisms. A transport service between points in a network often traverses multiple technologies involving numerous containments and adaptations. A network event affecting the transport service may occur in any number of elements supporting the transport service, resulting in a myriad of alarms. Prior techniques for suppressing alarms involving complex network information models and coding logic to reduce the number of alarms presented, but require additional steps before the network event can be troubleshot and resolved. In contrast, the provided alarm correlation technique presents a highly structured and comprehensive visual presentation depicting the network event affecting the transport service in terms of the supporting elements affected by the network event. The provided visual presentation enables a viewer to visually correlate the network event affecting the transport service with the transport service affected by the network event directly. | 11-27-2008 |
| 20080292241 | Methods and Apparatus to Make Substantially Uniform Losses in Optical Cross Connects - A method for cross connecting optical signals includes using a common beam steerer to direct a set of optical signals from a set of input ports to a set of output ports. The method further includes adjusting a curvature of the common beam steerer so that paths of the optical signals have substantially the same effective path length. | 11-27-2008 |
| 20080291925 | METHOD AND APPARATUS FOR INTERACTIVE ROUTING - A method to provision routes in a network having a plurality of nodes and a plurality of links connecting various nodes. The method includes determining a route between a designated source node and a designated destination node based on a preselected routing algorithm and one of (i) a designated node of interest and (ii) a designated link of interest, and outputting information indicating the determined route. | 11-27-2008 |
| 20080260386 | RECONFIGURABLE OPTICAL ADD DROP MULTIPLEXER CORE DEVICE, PROCEDURE AND SYSTEM USING SUCH DEVICE, OPTICAL LIGHT DISTRIBUTOR, AND COUPLING-RATIO ASSIGNING PROCEDURE - A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor is configured to receive an optical signal along a primary input of the reconfigurable optical add drop multiplexer core device and to distribute the received optical signal along a plurality of subtending outputs. The light combiner is configured to receive optical signals along a plurality of subtending inputs, to combine the received optical signals into a combined signal, and to output the combined signal. The add and drop ports in the first set function as add and drop ports, respectively, and the add and drop ports in the second set function as both add and drop ports, respectively, and as express ports connectable to another reconfigurable optical add drop multiplexer core device. | 10-23-2008 |
| 20080259963 | SYSTEMS AND METHODS FOR SWITCHING MULTI-RATE COMMUNICATIONS - A method for switching multi-rate communications is described. The method includes filling a first set of p timeslots with p sets of data from a first data collection of a first type, where the first data collection includes m sets of data and p is less than m. The method also includes loading at least one overflow timeslot with at least one overflow set of data from the first data collection, where the overflow set of data exceeds a size of the first set of p timeslots. | 10-23-2008 |
| 20080233858 | APPARATUS, SYSTEM, AND METHOD FOR VENTING A CHASSIS - An apparatus, system, and method are provided for venting an enclosure, such as a chassis housing electronic equipment. The method includes receiving, at least one air directing surface, airflow moving in a first direction, the at least one air directing surface being disposed externally from the chassis at a predetermined placement relative to the at least one ventilation surface in a path of the airflow. The at least one air directing surface has a configuration to alter the direction of the airflow between the air directing surface and the at least one ventilation surface. The method also includes redirecting the airflow between the at least one air directing surface and the at least one ventilation surface to at least a second direction using the air directing surface. The predetermined placement and configuration of the at least one air directing surface determine the second direction in which the airflow is discharged, and the second direction is either towards or away from the at least one ventilation surface. Also in the receiving, the airflow is received at least one air directing surface of a bracket configured to attach the chassis to a mounting structure. | 09-25-2008 |
| 20080217962 | APPARATUS AND METHOD FOR CONFIGURING A DUAL RACK-MOUNTABLE CHASSIS - A method of configuring a rack-mountable chassis is provided. The method includes measuring a length and width of a card module slot of the chassis, a first opening width of a first rack for housing the chassis, and a second opening width of a second rack for housing the chassis, where the first opening width is greater than the second opening width. The method also includes verifying whether the first opening width is sufficiently wide to allow enough clearance between at least one side of the chassis and the first rack when the chassis is disposed in the first rack, to allow for the adequate cooling of housed components. If the first opening width is sufficiently wide, a dimension of at least one parameter related to the configuration of the chassis is determined so that the second opening width is a multiple of a total chassis width of the chassis. A chassis configured according to the method is provided. | 09-11-2008 |
| 20080212744 | Method, system, apparatus, and program for verifying media service features - Methods, systems, and computer program products are provided for verifying a service provided to at least one subscriber terminal in a communication network. The method includes connecting a communication device to the network, logging into a test unit communicatively coupled to the network using the communication device, entering into the communication device an access code corresponding to a test for verifying a service, and conducting the test for verifying the service, corresponding to the access code. | 09-04-2008 |
| 20080205028 | STACKABLE CABLE TRAY - A cable tray is provided comprising a housing defining an interior portion, the housing having at least one positioned opening formed therein and also having plural, open ends in communication with the interior portion and the at least one positioned opening for passage of at least one cable therethrough. The housing is adapted to be coupled to at least one external surface, such that at least one of the plural, open ends substantially aligns with at least one open end of a housing of at least one further cable tray. | 08-28-2008 |
