Patents Assigned to Tellabs Operation, Inc.
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Patent number: 8441942Abstract: A method and system of loop detection for improving network performance and data integrity over a communications network are disclosed. A process is capable of transmitting a diagnostic packet stream from a source object to a destination object. The diagnostic packet stream, in one embodiment, is an IEEE 802.1ag continuity check message and is transported to a destination object periodically across a communications network. Upon receipt of a returning packet stream from the destination object, the process broadcasts loop detection at a port level in response to the comparison between the returning packet stream and the diagnostic packet stream.Type: GrantFiled: December 3, 2008Date of Patent: May 14, 2013Assignee: Tellabs Operations Inc.Inventors: Sumit Guha, Tejeswar Pichuka, Sanjoy Bardhan, Pawan K. Singal
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Patent number: 8433191Abstract: 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).Type: GrantFiled: May 25, 2010Date of Patent: April 30, 2013Assignee: Tellabs Operations, Inc.Inventors: Eric L. Chan, Matthew S. Vrba
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Patent number: 8428461Abstract: An apparatus for managing an optical signal includes a system optics card including an add filter, a drop filter, electrical backplane connector, and a mechanical front panel including express input and output ports providing channels to other system optics cards. The card transports information over a first optical transport link and receives information over a second optical transport link. The card identifies at least one network channel on the second optical transport link destined for a client device. The drop filter delivers the identified network channel to the optical converter card for delivery to the client device. The add filter receives client channels from the optical converter card generated by the client device. The card also transports the client channels of the client device over the first optical transport link. The electrical backplane connector is connectable to a chassis for housing the system optics cards and other system optics cards and/or other optics cards.Type: GrantFiled: July 12, 2007Date of Patent: April 23, 2013Assignee: Tellabs Operations, Inc.Inventors: Mark Boduch, Kimon Papakos
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Patent number: 8416813Abstract: An apparatus and method for managing clock domain(s) crossing several communication networks are disclosed. In one embodiment, a process capable of managing clock domains receives a data stream over a circuit emulation service (“CES”). Upon storing the data stream in a traffic buffer, the process selects a first clock domain for processing the data stream in the traffic buffer. For example, the process is capable of using the first clock domain to process and/or empty a jitter buffer, which stores CES data packets. The traffic buffer is monitored and the first clock domain can be replaced with a second clock domain if the storage capacity of the traffic buffer indicates that a different clock domain is needed.Type: GrantFiled: April 29, 2009Date of Patent: April 9, 2013Assignee: Tellabs Operations, Inc.Inventors: Nirav J. Modi, Robert E. Bland, Christopher V. O'Brien
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Patent number: 8407365Abstract: A method and apparatus for discovering network paths sets a bit, normally used for purposes other than tracing a network path, in an overhead portion of a signal for causing state changes at nodes along a network path. The state changes are correlated with information about the signal to determine link connectivity between nodes to identify the network path. In a network of DS3 circuits, a non-critical alarm bit is set in a signal to transmit Remote Alarm Indications (RAI) which activate alarms at nodes of the network path. A response signal from the nodes can be sent through a network to a main node for correlation purposes. The method of discovering network paths can be used to update network path databases of network carriers and can be offered as a service to network carriers.Type: GrantFiled: May 24, 2004Date of Patent: March 26, 2013Assignee: Tellabs Operations, Inc.Inventors: Gary S. Feutz, Thomas T. Rarick, Devindran Rajakrishna
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Patent number: 8401348Abstract: 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.Type: GrantFiled: March 4, 2009Date of Patent: March 19, 2013Assignee: Tellabs Operations, Inc.Inventor: Mark E. Boduch
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Publication number: 20130064073Abstract: The embodiments disclosed herein provide a mechanism for sharing protection resources in an arbitrary network topology involving pre-computing the protection resources so that data-plane-based protection can be used to activate the protection resources upon detection of a failure, thus, providing faster switching times than typical control-plane-based solutions. This is accomplished by configuring a mesh network to include, for a working path in the network, one or more protection paths with the same end nodes as the working path, where each protection path includes at least one intermediate node that is not part of the working path. The intermediate node accepts a protection request from one of the end nodes and determines whether a local resource for a protection path is available.Type: ApplicationFiled: September 12, 2011Publication date: March 14, 2013Applicant: Tellabs Operations, Inc.Inventors: Weiying Cheng, Jonathan B. Sadler, Thomas J. Huber, Anoop John Mathew
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Patent number: 8385205Abstract: 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.Type: GrantFiled: September 20, 2007Date of Patent: February 26, 2013Assignee: Tellabs Operations, Inc.Inventor: John Belden Kenney
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Patent number: 8380078Abstract: 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.Type: GrantFiled: July 29, 2010Date of Patent: February 19, 2013Assignee: Tellabs Operations, Inc.Inventors: Mark E. Boduch, Kimon Papakos, Gary M. Eslary, John M. Golding
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Patent number: 8374510Abstract: 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.Type: GrantFiled: August 6, 2008Date of Patent: February 12, 2013Assignee: Tellabs Operations, Inc.Inventors: Julia Y. Larikova, Richard C. Younce
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Patent number: 8364480Abstract: A method and corresponding apparatus for coded-domain acoustic echo control is presented. An echo control problem is considered as that of perceptually matching an echo signal to a reference signal. A perceptual similarity function that is based on the coded spectral parameters produced by the speech codec is defined. Since codecs introduce a significant degree of non-linearity into the echo signal, the similarity function is designed to be robust against such effects. The similarity function is incorporated into a coded-domain echo control system that also includes spectrally-matched noise injection for replacing echo frames with comfort noise. Using actual echoes recorded over a commercial mobile network, it is shown herein that the similarity function is robust against both codec non-linearities and additive noise. Experimental results further show that the echo-control is effective at suppressing echoes compared to a Normalized Least Mean Squared (NLMS)-based echo cancellation system.Type: GrantFiled: September 9, 2011Date of Patent: January 29, 2013Assignee: Tellabs Operations, Inc.Inventor: Rafid A. Sukkar
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Patent number: 8339941Abstract: The specification discloses methods and apparatus for selecting the better of two or more copies of a cell in a cell-oriented redundant switching system connected to an external communications network. In the preferred embodiment, the best cell copy selection aligns redundantly transmitted cell streams before selecting cells for insertion in the data stream. Because the streams are aligned before the selection is made, the best cell copy selector compares each cell at the same instant in time, rather than basing its selection on past events.Type: GrantFiled: May 5, 2003Date of Patent: December 25, 2012Assignee: Tellabs Operations, Inc.Inventors: Mark E. Boduch, Mark A. Richmond, Lawrence D. Weizeorick
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Patent number: 8335240Abstract: Erroneous data due to faults are prevented from propagating through a distributed network node having diversely routed communications links by using a fault masking technique that eliminates the 60 ms of error propagation time associated with SONET networks. The fault masking technique can also prevent random bit errors from propagating through the distributed network node. A frame alignment technique used in the network node is scalable for very wide words (e.g., 128 bits) for use with high speed optical communications protocols, such as OC-192.Type: GrantFiled: December 14, 2007Date of Patent: December 18, 2012Assignee: Tellabs Operations, Inc.Inventor: Mark E. Boduch
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Patent number: 8328026Abstract: A chassis having a housing in which at least one card module can be arrange is provided. The chassis is arranged in a first rack horizontally or a second rack vertically wherein the second rack opening width is an integer multiple of the predetermined chassis width. A fan slot and ventilation openings are provided in the chassis to allow for airflow across the card modules. Mounting mechanisms facilitate coupling of the chassis to the first and second rack and include ventilation openings through which air passes.Type: GrantFiled: February 22, 2008Date of Patent: December 11, 2012Assignee: Tellabs Operations, Inc.Inventors: Mark E. Boduch, Kimon Papakos, Scott A. Blakemore, David J. Womac
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Patent number: 8320409Abstract: Erroneous data due to faults are prevented from propagating through a distributed network node having diversely routed communications links by using a fault masking technique that eliminates the 60 ms of error propagation time associated with SONET networks. The fault masking technique can also prevent random bit errors from propagating through the distributed network node. A frame alignment technique used in the network node is scalable for very wide words (e.g., 128 bits) for use with high speed optical communications protocols, such as OC-192.Type: GrantFiled: July 31, 2003Date of Patent: November 27, 2012Assignee: Tellabs Operations, Inc.Inventors: Mark E. Boduch, Chris R. Zettinger, Charles R. Parilla
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Patent number: 8320759Abstract: 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.Type: GrantFiled: March 4, 2009Date of Patent: November 27, 2012Assignee: Tellabs Operations, Inc.Inventor: Mark E. Boduch
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Patent number: 8321547Abstract: 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.Type: GrantFiled: May 22, 2008Date of Patent: November 27, 2012Assignee: Tellabs Operations, Inc.Inventors: Ramasubramanian Anand, Hector Ayala, Abhishek J. Desai, Kenneth M. Fisher, David W. Jenkins
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Patent number: 8315299Abstract: 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: GrantFiled: March 7, 2011Date of Patent: November 20, 2012Assignee: Tellabs Operations, Inc.Inventors: Gopal Harikumar, Daniel J. Marchok, Kenneth J. Rudofski
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Publication number: 20120281523Abstract: In a telecommunications/data network, it is common to have multiple recovery domains each employing its own technique for recovering a fault that may be different from a technique employed by another domain. Permitting multiple recovery domains to recover a fault without coordination among the domains can result in adverse interactions, such as rapid and repeated changes in the actions taken or “flapping,” and repeated hits to traffic. A method and corresponding apparatus for coordinating fault recovery in a network, according to an embodiment of the present invention, notifies a first recovery domain that a second recovery domain is or is not taking action to recover a fault in the network. Coordinating the recovery efforts of the first and second recovery domains reduces fault recovery time and allows concurrent actions to be taken.Type: ApplicationFiled: November 3, 2011Publication date: November 8, 2012Applicant: Tellabs Operations, Inc.Inventors: Thomas J. Huber, Jonathan B. Sadler, Mark L. Jones
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Patent number: 8284789Abstract: 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.Type: GrantFiled: April 29, 2009Date of Patent: October 9, 2012Assignee: Tellabs Operations, Inc.Inventor: Yee Ming Soon