Patents Assigned to Tellabs Operation, Inc.
  • Publication number: 20120076013
    Abstract: 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.
    Type: Application
    Filed: September 27, 2010
    Publication date: March 29, 2012
    Applicant: Tellabs Operations, Inc.
    Inventor: Weiying Cheng
  • Publication number: 20120069742
    Abstract: 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.
    Type: Application
    Filed: September 22, 2010
    Publication date: March 22, 2012
    Applicant: Tellabs Operations, Inc.
    Inventors: William A. Kaufmann, Douglas J. Hawn, Chirayu A. Shah, Bruce M. Lasley, Ian P. Butler, Jason T. Ledgerwood Jesseph
  • Patent number: 8139471
    Abstract: A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to the clock signal. The communications system also includes a receiver for receiving the OFDM/DMT symbols from the transmission medium. The receiver demodulates the received symbols using at least one timing signal. The receiver has a first pilot tone search mode of operation in which the receiver adjusts its timing signal to scan the frequency range of the predetermined number of bins looking for the pilot tone sub-symbol and identifies the bin including the pilot tone sub-symbol.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: March 20, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Daniel J. Marchok, Samir Kapoor, Ravi Chandran
  • Publication number: 20120063778
    Abstract: 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.
    Type: Application
    Filed: November 18, 2011
    Publication date: March 15, 2012
    Applicant: Tellabs Operations, Inc.
    Inventors: Philip J. Lin, James D. Mills
  • Patent number: 8134939
    Abstract: 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 log2 W?1 where W is a power of 2. Each of the N nodes includes switches connected such that each channel of a first one of the links adjacent to any one of the N nodes can be switched to no more than W?1 channels of another one of the links adjacent any one node.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: March 13, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Rajiv Ramaswami, Galen H. Sasaki
  • Patent number: 8135002
    Abstract: 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.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: March 13, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Thomas E. Ryan, Mark E. Boduch, John B. Kenney
  • Patent number: 8130637
    Abstract: 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.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: March 6, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Kenneth R. Owens, Srinivas V. Makam, Changcheng Huang, Vishal Sharma
  • Publication number: 20120051217
    Abstract: Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates. Example methods and apparatus ensure appropriate traffic allocation to meet certain QoS metrics.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: Tellabs Operations, Inc.
    Inventors: Leo S. Lee, Timothy E. Blair, David H. Liu
  • Patent number: 8125891
    Abstract: 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.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: February 28, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: T. Benjamin Mack-Crane, Jonathan B. Sadler, Susan W. Teller
  • Patent number: 8116629
    Abstract: 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.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: February 14, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Mark E. Boduch, Kimon Papakos, Gilbert A. Buescher
  • Patent number: 8102928
    Abstract: 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.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: January 24, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Gopal Harikumar, Daniel J. Marchok
  • Publication number: 20120008493
    Abstract: 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.
    Type: Application
    Filed: September 16, 2011
    Publication date: January 12, 2012
    Applicant: Tellabs Operations, Inc.
    Inventors: Robert B. Magill, Philip J. Lin
  • Patent number: 8095374
    Abstract: An embodiment of the present invention is a method and apparatus for extending bandwidth of a speech communication beyond a band-limited region to which the speech communication may be otherwise constrained. Such embodiments may be used to provide higher fidelity speech to the listener for an enhanced user experience.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: January 10, 2012
    Assignee: Tellabs Operations, Inc.
    Inventor: Oguz Tanrikulu
  • Patent number: 8095007
    Abstract: 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.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: January 10, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Philip J. Lin, James D. Mills
  • Patent number: 8089985
    Abstract: 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.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: January 3, 2012
    Assignee: Tellabs Operations Inc.
    Inventor: John B. Kenney
  • Publication number: 20110317964
    Abstract: 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.
    Type: Application
    Filed: September 2, 2010
    Publication date: December 29, 2011
    Applicant: Tellabs Operations, Inc.
    Inventor: Thomas John Downs
  • Patent number: 8081639
    Abstract: 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.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: December 20, 2011
    Assignee: Tellabs Operations, Inc.
    Inventors: Lawrence D. Weizeorick, Bruce R. Zelle, Steven T. DeLong
  • Patent number: 8078435
    Abstract: 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.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: December 13, 2011
    Assignee: Tellabs Operations, Inc.
    Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Abhishek J. Desai, Kenneth M. Fisher
  • Publication number: 20110293053
    Abstract: 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.
    Type: Application
    Filed: March 7, 2011
    Publication date: December 1, 2011
    Applicant: Tellabs Operations, Inc.
    Inventors: Gopal Harikumar, Daniel J. Marchok, Kenneth J. Rudofski
  • Patent number: 8059549
    Abstract: Methods and apparatuses are disclosed for interworking a first protocol, e.g., Provider Backbone Bridge Traffic Engineering (PBB-TE), that provides Ethernet carrier-class traffic engineering, with a second protocol, e.g., Virtual Private LAN Service, that emulates local area network (LAN) service. Unicast, multicast, and broadcast transmissions are enabled across an Ethernet aggregation network and an MPLS core network. Dual homing protection and end-to-end traffic engineering with adjustable granularity are also provided. These capabilities are not available with traditional PBB-TE networks or with an interworking between PBB and VPLS that has been previously proposed. Embodiments of the invention terminate a PBB-TE tunnel at a user-facing provider edge (UPE) node and attach instance service identifiers (ISIDs) to different virtual switching instances (VSI)s.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: November 15, 2011
    Assignee: Tellabs Operations, Inc.
    Inventors: Yee Ming Soon, Chirayu A. Shah