By Loopback Patents (Class 379/22.01)
  • Patent number: 9608694
    Abstract: A method for locating an impairment within a telecommunication line may include determining measurement data related to the telecommunication line and estimating a location of the impairment depending on the measurement data. The measurement data includes crosstalk data including at least one transfer function element of a crosstalk matrix. The transfer function element characterizes a crosstalk transfer function from the telecommunication line towards the at least one further telecommunication line, and the method includes detecting oscillations in the crosstalk transfer function.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: March 28, 2017
    Assignee: Alcatel Lucent
    Inventors: Xavier Dardenne, Benoît Drooghaag
  • Patent number: 9535185
    Abstract: Methods and systems for failure point diagnostics in cable telemetry at a wellsite. The methods involve providing a system includes a cable operatively coupling between a surface modem and a downhole modem that is operatively coupled to a downhole toolstring of one or more downhole tools via a toolbus. The methods further involve generating a plurality of test signals, sequentially applying the test signals across one or more test loops in the cable telemetry system, and generating a failure point alert when at least one of the test signals fails in at least one of the test loops. The failure point alert identifies which component of the cable telemetry system caused the test signal to fail.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: January 3, 2017
    Assignee: Schlumberger technology Corporation
    Inventors: Alex Olson, Nalin Weerasinghe, Milos Milosevic, Kun Wang, Motohiro Nakanouchi, Kenji Endo, Yuichi Kobayashi, Hiromasa Nishisaka
  • Patent number: 9401994
    Abstract: Meeting and conferencing systems and methods are implemented in a variety of manners. Consistent with an embodiment of the present disclosure, a method for operating an audio conference system that includes at least one logic circuit and a caller interface involves receiving incoming telephony calls at the caller interface. A logic circuit is used to authenticate incoming telephony calls. Menu options are provided to authenticated, incoming telephony calls. In response to a selection of the menu options, an incoming telephony call is prompted to select a callback number. The logic circuit monitors for a trigger event. A participant is called back using the selected call back number in response to detecting the trigger event. The called-back participant is then placed into a conference.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: July 26, 2016
    Assignee: 8×8, Inc.
    Inventor: Ramprakash Narayanaswamy
  • Patent number: 9294615
    Abstract: A system and method for handling call recording failures for a contact center. A processor receives information on a first media controller currently assigned to a telephony call. The first media controller bridges a first media path between the first and second communication devices and records, into a storage device, media exchanged in the first media path during the telephony call. The processor detects failure of the first media controller during the telephony call, where the failure of the first media controller tears down the first media path. In response to detecting the failure, the processor bridges a second media path between the first and second communication devices until a second media controller is identified. In response to the second media controller being identified, the second media controller is signaled to bridge and record media exchanged during the telephony call.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: March 22, 2016
    Assignee: GENESYS TELECOMMUNICATIONS LABORATORIES, INC.
    Inventors: Henry Lum, Vladimir Filonov, Jeffrey Culbert, Daniel Blander, Somasundaram Subramaniam, Angelo Cicchitto, Paul Gvildys
  • Patent number: 9049197
    Abstract: A system and method for handling call recording failures for a contact center. A processor receives information on a first media controller currently assigned to a telephony call. The first media controller bridges a first media path between the first and second communication devices and records, into a storage device, media exchanged in the first media path during the telephony call. The processor detects failure of the first media controller during the telephony call, where the failure of the first media controller tears down the first media path. In response to detecting the failure, the processor bridges a second media path between the first and second communication devices until a second media controller is identified. In response to the second media controller being identified, the second media controller is signaled to bridge and record media exchanged during the telephony call.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: June 2, 2015
    Assignee: GENESYS TELECOMMUNICATIONS LABORATORIES, INC.
    Inventors: Henry Lum, Vladimir Filonov, Jeffrey Culbert, Daniel Blander, Somasundaram Subramaniam, Angelo Cicchitto, Paul Gvildys
  • Patent number: 8958312
    Abstract: A system operator provisions, or loads, a user's communication device, such as a cable modem, with multiple sets of loopback mode parameters that each facilitate a loopback test, and associates each set with multiple loopback numbers, or variable values. The loopback variables may be MIBs assigned to the device's manufacturer for use in initiating a loopback test of a user device. An operator may initiate a loopback test from a central computer device located remotely from the user device. The initiating device may be coupled to an operator's private IP network, or to a network coupled to the user device. The initiating device sends one of the loopback values in a SIP Invite message to the user device, without the use of SIP extensions, in a call. The user device recognizes the loopback value, auto-answers the call, and performs actions according to the provisioned parameters corresponding to the loopback value.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: February 17, 2015
    Assignee: ARRIS Enterprises, Inc.
    Inventors: Wade Carter, David Glandon
  • Patent number: 8938057
    Abstract: A method and system for registering a client for a call-pickup service and for executing the call-pickup service for a new call placed to a given communication device. The call-pickup service may carried out, in part, by providing the client with notification of when the new call is placed to the given communication device, the client requesting that the new call be re-routed to a location other than the given communication device, and a server re-routing the new call to the location other than the given communication device. The location other than the given communication device may be the client that registers for the call-pickup service or another location.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: January 20, 2015
    Assignee: SPrint Spectrum L.P.
    Inventors: Baoquan Zhang, Farni B. Weaver, Von K. McConnell
  • Patent number: 8879691
    Abstract: A system, method, and computer readable medium for a metallic test method in a digital subscriber line system in which a subscriber's voice service has been switched from plain old telephony service to an inband digital subscriber line data stream characterized in that a direct current loop current used for plain old telephony service is replicated for testing, comprising, providing a sealing line current to a transmission line via a digital subscriber line device serving the subscriber and supervising the provided sealing line current between the digital subscriber line device and a subscriber's premises for determining a connectivity therebetween.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: November 4, 2014
    Assignee: Alcatel Lucent
    Inventors: Franciscus Maria Ploumen, Paul Franceschini
  • Patent number: 8737574
    Abstract: In one of many possible embodiments, an exemplary system includes a test management subsystem configured to provide a user portal to a user of a circuit provided by a service provider, the user portal including a tool enabling the user to select a signal loop for testing at least a section of the circuit, the signal loop being selected from a plurality of signal loop options. The system also includes a network management subsystem communicatively coupled to the test management subsystem, the network management subsystem being configured to receive data representative of the selection from the test management subsystem and instruct, based on the selection, a network device along the circuit to execute a loop-back mode. In certain embodiments, the selected signal loop defines a test pattern signal flow for testing a subsection of the circuit.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: May 27, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Yiming Wang, Lauren B. Adelson, David J. Buie, Colleen Davis, Peter C. Serubo, Roland J. Zito-Wolf
  • Patent number: 8644169
    Abstract: A data analyzer operative to be located at a customer premises, causes the transmission of a probing signal into at least one telephone line. The data analyzer computes a parameter that represents a characteristic of at least one telephone line based upon at least a measured reflected probing signal.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: February 4, 2014
    Assignees: Adaptive Spectrum and Signal Alignment, Inc., AT&T Intellectual Property I, L.P.
    Inventors: John M Cioffi, George Ginis, Peter J. Silverman, Bin Lee, Richard Dennis Hart
  • Patent number: 8553571
    Abstract: A method of automatic response and loop-backing is developed for remotely measuring the quality of the Internet telephone by IP phone. When a quality measuring instrument is requested to measure the quality of Internet telephone, a request call is placed to an IP phone for quality measurement. The method of automatic response and loopback is enable the IP phone to handle the call for quality measuring without interrupting the user of IP phone without affecting utilization of supplementary Internet telephone services.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: October 8, 2013
    Inventors: Sun Joo Yang, Joo Young Kim
  • Patent number: 8392612
    Abstract: A method for a client computer to find a network address of a server computer by searching for the network address using at a backup search procedure if the address of the server computer cannot be identified using a primary search procedure. The primary and backup search procedures can be performed in parallel and multiple backup search procedures can be performed to identify the address of the server computer. Alternatively, the primary and backup search procedures can be performed in serial wherein the backup search procedure is performed only when the primary search procedure does not identify the address of the server computer.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: March 5, 2013
    Assignee: Apple Inc.
    Inventors: Steven N. Simon, David M. O'Rourke
  • Patent number: 8259595
    Abstract: Each of the host transmitting/receiving blocks of a plurality of I/O units connected to a CNC reads the destination specification data and a diagnostic result bit each time the host transmitting/receiving block receives a signal packet from the CNC. When the diagnostic result bit indicates the execution of a diagnosis, the signal packet contains diagnostic DO data, and the relevant DO signal output terminal is short-circuited to the relevant DI signal input terminal to form a diagnostic loop. The diagnostic packet signal passes through the diagnostic loop, the external signal transmitting/receiving block, and the host transmitting/receiving block and returns to the CNC through the host transmitting/receiving block of an adjacent I/O unit closer to the CNC. The CNC analyzes the packet signal to determine whether each of the I/O units is operating normally or not.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: September 4, 2012
    Assignee: Fanuc Ltd
    Inventors: Kouji Hada, Hiroshige Ando, Hiroshi Noda
  • Publication number: 20120163558
    Abstract: When making a decision about who should have control of a voice channel in a teleconference, one exemplary aspect is directed toward a voice switch mechanism that determines and takes into account a latency (such as a round trip latency) of each participant's path to the switch. The switch uses this information to ensure that short-latency paths do not have an unfair advantage over long-latency paths when individuals competitively seek control of the voice channel. Illustratively, if an individual is participating in the path that has a round trip latency of 300 ms or greater than that of other participants, the voice switch creates a level playing field even if it detects voice energy from a short-latency user first by granting control of the channel to the long-latency user if voice energy is detected from that user within 300 ms of the short-latency detection.
    Type: Application
    Filed: December 27, 2010
    Publication date: June 28, 2012
    Applicant: AVAYA INC.
    Inventor: Paul Roller Michaelis
  • Patent number: 8130911
    Abstract: A system, method, and transceiver unit for determining one or more properties of a digital subscriber line (DSL) utilizing a time-variable finite impulse response (FIR) filter. The transceiver unit sends a loop test signal to the line and calculates an impulse response of a reflection of the loop test signal from the line. The calculated impulse response is filtered utilizing the time-variable FIR filter and properties of the line are determined. Characteristics of the FIR filter may be controlled by a set of parameters that vary as a function of time according to a predetermined formula. As a result, the FIR filter provides both high time resolution of closely separated pulses and amplification of far-end pulse reflections.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: March 6, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per Ola Borjesson, Fredrik Lindqvist
  • Patent number: 8098797
    Abstract: In one of many possible embodiments, an exemplary system includes a test management subsystem configured to provide a user portal to a user of a circuit provided by a service provider, the user portal including a tool enabling the user to select a signal loop for testing at least a section of the circuit, the signal loop being selected from a plurality of signal loop options. The system also includes a network management subsystem communicatively coupled to the test management subsystem, the network management subsystem being configured to receive data representative of the selection from the test management subsystem and instruct, based on the selection, a network device along the circuit to execute a loop-back mode. In certain embodiments, the selected signal loop defines a test pattern signal flow for testing a subsection of the circuit.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: January 17, 2012
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Yiming Wang, Lauren B. Adelson, David J. Buie, Colleen Davis, Peter C. Serubo, Roland J. Zito-Wolf
  • Patent number: 8073135
    Abstract: Methods, techniques and apparatus identify members and characteristics of binders and/or other groups of communication lines such as those in a DSL system. Information obtained includes the identification (for example, by scanning) of significant crosstalking “offenders” and their “victims” that are affected by the crosstalk. One or a small number of modems are instructed to transmit with preselected transmit spectra, after which evidence of crosstalk in the noise spectrum data is examined for potential victim lines. Direct evidence of noise spectrum contribution by a suspected offender line may be obtained by collecting reported noise spectrum data and/or estimated noise spectrum data from potential victim lines. Also, where such direct evidence is not available, or in addition to it, other operational data showing crosstalk interference relating to potential victim lines can be used. The transmitting modem can either be on the CO/RT side or on the CPE side.
    Type: Grant
    Filed: January 28, 2006
    Date of Patent: December 6, 2011
    Assignee: Adaptive Spectrum and Signal Alignment, Inc.
    Inventors: Wonjong Rhee, Bin Lee, Iker Almandoz, John M. Cioffi, Georgios Ginis
  • Patent number: 8054946
    Abstract: A pilot signal is transmitted from a transmitting device through a communication network under test to a receiving device. The pilot signal is transmitted at a known transmit time and in a voice channel. Incoming signals within the voice channel at the receiving device are monitored to detect receipt of the pilot signal. A receipt time of the pilot signal at the receiving device is identified. The one-way delay (OWD) is determined as a difference between the receipt time of the pilot signal at the receiving device and the transmit time of the pilot signal from the transmitting device.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: November 8, 2011
    Assignee: Spirent Communications, Inc.
    Inventors: Mikhail Kronrod, Vladimir Movshovich, Elizaveta K. Tavastcherna
  • Patent number: 8031841
    Abstract: A method and apparatus for mechanizing the currently manual ADSL loop testing process is disclosed. In one embodiment, an automated loop testing device is disclosed, where the loop testing device has a pair of terminals, e.g., RJ-11 jacks on both sides of the device. The jack on one side connects to inside wiring which, in turn, connects to an ADSL modem. The other jack connects to an outside line which, in turn, connects to a central office of a network provider. In operation, the present device detects a line voltage reversal and then disconnects the input line to the ADSL Modem. When the voltage returns to normal, then the device behaves normally by being closed, essentially acting as a pass through device and again connects the input lines to the output lines.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: October 4, 2011
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Farhad Barzegar, Irwin Gerszberg, Thomas Hill, Scott Mollica
  • Patent number: 7992058
    Abstract: A system and method for loopback self testing. A system includes a host device and an endpoint device. The host device transmits unencoded test symbols. The endpoint device loops back the unencoded test symbols to the host device. The host device drives at least some bits of each unencoded test symbol onto host device data signals and drives at least some bits of each unencoded test symbol onto host device control signals.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: August 2, 2011
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Peter D. Maroni, Gregg B. Lesartre
  • Patent number: 7653180
    Abstract: A test system and method for performing DSL assessments of a telephone line along a prescribed test path is disclosed. The disclosed test system and method includes a loop diagnostic test unit adapted for testing said telephone line using narrow-band and mid-band frequency test signals; a test system controller and a test system server to provide the DSL assessments to a user via an appropriate interface. In addition, the disclosed analysis methods utilize primary line condition information, secondary line condition information, historical line information, together with real-time measurements and external data inputs to perform line imbalance analysis, fault identification analysis, trend analysis, and jurisdictional analysis all of which have relevance to quality, performance and assurance of DSL service through the telephone line.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: January 26, 2010
    Assignee: Tollgrade Communications, Inc.
    Inventors: Roderick Warner, Muhammad A. Afzal, Frank R. Bauer, Joseph S. Rosen
  • Patent number: 7620155
    Abstract: A method and apparatus for mechanizing the currently manual ADSL loop testing process is disclosed. In one embodiment, an automated loop testing device is disclosed, where the loop testing device has a pair of terminals, e.g., RJ-11 jacks on both sides of the device. The jack on one side connects to inside wiring which, in turn, connects to an ADSL modem. The other jack connects to an outside line which, in turn, connects to a central office of a network provider. In operation, the present device detects a line voltage reversal and then disconnects the input line to the ADSL Modem. When the voltage returns to normal, then the device behaves normally by being closed, essentially acting as a pass through device and again connects the input lines to the output lines.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: November 17, 2009
    Assignee: AT&T Corp.
    Inventors: Farhad Barzegar, Irwin Gerszberg, Thomas Hill, Scott Mollica
  • Patent number: 7609817
    Abstract: A network interface unit has an interface coupled to a first transmit line and a first receive line, and the interface is configured to receive a signal from the first receive line. The network interface unit further has circuitry operable in a test mode and a data mode that couples the received signal to the second transmit line via a first path while operating in the data mode. The circuitry further disables coupling of the signal to the second transmit line, couples the signal via an alternate path to the first transmit line, and creates a bias voltage about which a termination impedance for the second transmit line is centered while operating in test mode.
    Type: Grant
    Filed: July 5, 2005
    Date of Patent: October 27, 2009
    Assignee: ADTRAN, Inc.
    Inventor: David E. Jones
  • Patent number: 7539148
    Abstract: Techniques for performing a continuity check operation include sending a pattern of bits over a packet network connection through a first interface on a packet network to a second interface on the packet network. The first interface is monitored for return of the pattern of bits over the packet network connection. A decision whether the continuity check is successful is based on whether the pattern of bits is detected at the first interface during the monitoring. The techniques can be used for both narrowband as well as broadband calls over the packet network.
    Type: Grant
    Filed: January 20, 2006
    Date of Patent: May 26, 2009
    Assignee: Tellabs Operations, Inc.
    Inventors: Dale A. Scholtens, David Wells
  • Publication number: 20090129557
    Abstract: A system operator provisions, or loads, a user's communication device, such as a cable modem, with multiple sets of loopback mode parameters that each facilitate a loopback test, and associates each set with multiple loopback numbers, or variable values. The loopback variables may be MIBs assigned to the device's manufacturer for use in initiating a loopback test of a user device. An operator may initiate a loopback test from a central computer device located remotely from the user device. The initiating device may be coupled to an operator's private IP network, or to a network coupled to the user device. The initiating device sends one of the loopback values in a SIP Invite message to the user device, without the use of SIP extensions, in a call. The user device recognizes the loopback value, auto-answers the call, and performs actions according to the provisioned parameters corresponding to the loopback value.
    Type: Application
    Filed: October 9, 2008
    Publication date: May 21, 2009
    Inventors: Wade Carter, David Glandon
  • Patent number: 7529349
    Abstract: A portable, automated telephone line test device includes a test module which applies test signals to a telephone line to be tested and detects electrical characteristics of the telephone line, and a user interface module. The user interface module includes a microprocessor, a display, a keyboard and a program memory in accordance with a standard microcomputer architecture. The processor of the user interface module is programmed to control the test module to perform a pre-programmed sequence of tests. The display provides indications of the tests being performed. The programmed sequence is varied by the device according to test results. Depending on the results obtained, the device also provides interpretative diagnostic messages and instructs the user to carry out additional test procedures.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: May 5, 2009
    Assignee: Verizon Communications, Inc.
    Inventors: Robert J. Lysaght, Donald Finger, Jeffrey Hahn, Anthony M. Kolodzinski, Howard Citron, Yu-Ling Wu
  • Patent number: 7453989
    Abstract: A network interface device is positioned between a subscriber loop and the internal wiring of a subscriber's premise. Operational and performance data is captured and stored in memory for later use and analysis. Commands issued to the network interface device selectively loop-back transmitted data at either the network or subscriber side of the network interface device and/or selectively engage or disengage one or more of the addressed subscriber and premise loops.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: November 18, 2008
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Joseph Carbain
  • Patent number: 7440421
    Abstract: A method is disclosed that enables a data-processing system, such as a private branch exchange, to detect and disconnect looping communication channels, without some of the costs, disadvantages, and limitations of techniques in the prior art. The illustrative embodiment of the present invention provides detection of looping communication channels at the point where the loop begins. By detecting at the beginning point of the loop, the illustrative embodiment has the advantage of de-allocating call resources sooner than some techniques in the prior art. This enables the call resources to be reused faster for subsequent incoming and outgoing calls. Faster reuse is advantageous because it can lower the call blocking characteristic, which is related to the probability of a new call not being set up due to lack of communication channel resources.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: October 21, 2008
    Assignee: Avaya Inc.
    Inventors: Sandra R. Abramson, Frank John Boyle, III, David Lee Chavez, Jr., C. Joanne McMillen, Stephen M. Milton
  • Patent number: 7426262
    Abstract: The invention refers to single-ended test of a loop (2, 3). A test device (TD1) is connected to a remote device (3) via a line (2). The remote device is powered on and transmits intermittently handshake signals (HS1), which can disturb the loop test. A receiving and calculating unit (RE1) detects the handshake signals (HS1) and orders a sending unit (SD1) to send a halting signal (NAK-EF) to the remote device. The latter is halted for predetermined silent period of time, during which the test or a part of it is performed. If required the halting of the handshake signals is repeated. The test device sends a broadband loop test signal (S1) and receives a reflected signal (S2) during the silent period. A frequency dependent echo transfer function is generated from the signals (S1, S2) and is used for generating desired properties of the line (2) such as its length (L).
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: September 16, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Jonas Rosenberg
  • Patent number: 7356127
    Abstract: A digital wideband node (DWN) (28, 48) is coupled to a remote terminal (RT) (22, 42) that in turn is coupled to a subscriber's telephone line (26, 46). The DWN (28, 48) is configured to (1) pass a subscriber's telephone number signal directly to the RT (22, 42) whereupon a test path (25, 45) is formed with the subscriber's telephone line (26, 46), (2) pass POTS test signals directly to the RT (22, 42) for testing the subscriber's telephone line (26, 46) via the test path (25, 45) and (3) process wideband test control signals into wideband test signals which are conveyed to the RT (22, 42) for wideband testing of the subscriber's telephone line (26, 46) via the test path (25, 45).
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: April 8, 2008
    Assignee: Tollgrade Communications, Inc.
    Inventors: David J. Peduzzi, Roger A. Smith
  • Patent number: 7356471
    Abstract: A voice recognition system has a vehicle unit, which is a communication terminal, and a voice recognition server. The voice recognition server recognizes a voice signal received from the vehicle unit. A sound characteristic of a communication channel for providing communication between the vehicle unit and the server requires to be adjusted so that the server properly recognizes the voice signal. A test pattern signal is used for adjusting the sound characteristic. The vehicle unit adjusts the sound characteristic based on the test pattern signal. Therefore, the server does not require a large database for the sound characteristic adjustment because it is performed by the vehicle unit.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: April 8, 2008
    Assignee: DENSO Corporation
    Inventors: Toshiyuki Ito, Hiroshige Asada
  • Patent number: 7298828
    Abstract: A portable, automated telephone line test device includes a test module which applies test signals to a telephone line to be tested and detects electrical characteristics of the telephone line, and a user interface module. The user interface module includes a microprocessor, a display, a keyboard and a program memory in accordance with a standard microcomputer architecture. The processor of the user interface module is programmed to control the test module to perform a pre-programmed sequence of tests. The display provides indications of the tests being performed. The programmed sequence is varied by the device according to test results. Depending on the results obtained, the device also provides interpretative diagnostic messages and instructs the user to carry out additional test procedures.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: November 20, 2007
    Assignee: Verizon Communications Inc.
    Inventors: Robert J. Lysaght, Donald Finger, Jeffrey Hahn, Anthony M. Kolodzinski, Howard Citron, Yu-Ling Wu
  • Patent number: 7245701
    Abstract: A system and method for verifying the integrity of a DSL circuit on a shared telephone line. The invention uses the amplitude modulation principles to overcome the difficulty associated with a blocking capacitor that isolates a DSLAM on the DSL circuit from the rest of the shared telephone line. A transmitter of the invention mixes a high frequency carrier signal and a low frequency audio signal to produce an amplitude-modulated test signal. The amplitude modulated signal is supplied to the telephone line at a main distributing frame side of the blocking capacitor and is detected by a receiver at the DSLAM side of the blocking capacitor.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: July 17, 2007
    Assignee: AT&T Intellectual Property, Inc.
    Inventors: Gary Tennyson, Eric Ott Brockman
  • Patent number: 7200206
    Abstract: A network interface device is positioned between a subscriber loop and the internal wiring of a subscriber's premise. Operational and performance data is captured and stored in memory for later use and analysis. Commands issued to the network interface device selectively loop-back transmitted data at either the network or subscriber side of the network interface device and/or selectively engage or disengage one or more of the addressed subscriber and premise loops.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: April 3, 2007
    Assignee: AT&T Corp.
    Inventor: Joseph Carbain
  • Patent number: 7177395
    Abstract: A telecommunications system central office includes a piece of central office equipment and a cross-connect frame that is configured to provide a connection point to the piece of central office electronic equipment. An electronic looping system is connected between the piece of central office equipment and the cross-connect frame. The electronic looping system includes electronically controlled switches that are operable to loop selected transmission paths between the piece of central office equipment and the electronic looping system, to open selected transmission paths between the piece of central office electronic equipment and the electronic looping system, to loop selected transmission paths between the electronic looping system and the cross-connect frame, to open selected transmission paths between the electronic looping system and the cross-connect frame and/or to pass-through selected transmission paths between the piece of electronic equipment and the cross-connect frame.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: February 13, 2007
    Assignee: BellSouth Intellectual Property Corporation
    Inventors: Blake R. Urban, Jorge Cobas
  • Patent number: 7099439
    Abstract: Systems and methods are described for measuring the quality of telephone transmission lines. A device, such as a loop test apparatus, can be located at a customer's premises and used for remotely diagnosing telephone line impairments, especially concerning the local loop and customer premises wiring. Such a device is valuable for determining if a telephone line is suitable for new services, such as DSL. The loop test apparatus can incorporate an integrated local loopback feature that can be controlled from a loop testing server (LTS) at, e.g., a telephone Central Office. The loop test apparatus can terminate a telephone line at the customer premises based on a message sent by the LTS. The local loopback will then reflect signals transmitted by the LTS back to the LTS so that line characteristics of the local loop and customer premises wiring can be analyzed, without the need to dispatch telephone company service equipment and/or personnel to a customer premises.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: August 29, 2006
    Assignee: ClassCo Inc.
    Inventor: David J. Luneau
  • Patent number: 7082299
    Abstract: A method for determining the performance of decoding in a telecommunication system having a decoder and a testing apparatus for supplying test data to the decoder includes generating test data having signalling data in a signalling frame format, mapping the test data into two consecutive frames and transmitting the test data from the testing apparatus to the decoder for decoding. The signalling data is decoded from the received two test data frames and transmitted back to the testing apparatus encoded in one frame. The performance of decoding is determined by comparing the transmitted signalling data and the received signalling data in the test apparatus.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: July 25, 2006
    Assignee: Nokia Corporation
    Inventors: Berthier Lemieux, Lene Bache
  • Patent number: 7054273
    Abstract: Techniques for performing a continuity check operation include sending a pattern of bits over a packet network connection through a first interface on a packet network to a second interface on the packet network. The first interface is monitored for return of the pattern of bits over the packet network connection. A decision whether the continuity check is successful is based on whether the pattern of bits is detected at the first interface during the monitoring. The techniques can be used for both narrowband as well as broadband calls over the packet network.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: May 30, 2006
    Assignee: Tellabs Operations, Inc.
    Inventors: Dale A. Scholtens, David Wells
  • Patent number: 7042984
    Abstract: Transmission channels indicated as occupied in a communications system having peripheral modules are inspected for preparing subscriber-side transmission channels. A test sequence transmitter on the system side transmits a test sequence to a control unit for a selected peripheral module. The test sequence is transmitted to a test sequence receiver over a transmission channel, which is indicated as occupied and which is assigned to the peripheral module. The test sequence, which is transmitted by the test sequence transmitter, and the test sequence, which is received by the test sequence receiver, are inspected for an evaluation of conformity. In the instance of non-conformity, the selected transmission channel is disconnected in a targeted manner.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: May 9, 2006
    Assignee: Siemens Aktiengesellschaft
    Inventors: Michael-Wilhelm Karl, Gottfried Silberhorn
  • Patent number: 7027389
    Abstract: The present invention provides a method and apparatus to determine the state of a communications link between two nodes in a network. Typically, each node will have an RTT-based value to use, a packets sent counter, and a threshold number to use against the packet sent counter to determine if there is a problem with their communications link. Using the RTT value makes the failure detection sensitive to the actual state of the communications link at any particular time; it also allows the failure detection algorithm to take into account the bursty nature of nodes in a packetized network connection. For each packet received from a non-local node, the local node sets the counter to 0 and starts a new RTT-based time interval. The local node then increments the counter only once, regardless of how many packets it sends to the non-local node, during the RTT-based time interval. Once the time interval is up, the counter is incremented for each packet sent.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: April 11, 2006
    Assignee: Cisco Technology, Inc.
    Inventor: Randall R. Stewart
  • Patent number: 7028235
    Abstract: A method of testing an electronic device including first and second semiconductor devices connected to each other with a plurality of bus lines. First, the first semiconductor device supplies a selected one of the bus lines with a first logical output signal. Then, the second semiconductor device acquires a first bus line signal from the selected bus line. The second semiconductor device inverts the first bus line signal to generate a second logical output signal. The second semiconductor device transmits the second logical output signal to the first semiconductor device. The first semiconductor device receives a second bus line signal from the selected bus line. The first semiconductor device compares the first logical output signal and the second bus line signal to detect a connection between the first semiconductor device and the second semiconductor device.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: April 11, 2006
    Assignee: Fujitsu Limited
    Inventor: Yoshiharu Kato
  • Patent number: 7013257
    Abstract: A communication system emulator digitally emulates a plurality of signal impairments created by the transmitter and receiver components and communication medium in a typical communication system, for use in evaluating and refining modem design. A variety of linear and non-linear distortion characteristics are impressed on baseband signals between modulators and demodulators to evaluate and refine modem performance without requiring transmission frequency components or communication channel. The emulator comprises transmit modules, receive modules and communication media modules, and can accept or output analog or digital signals. Each module is configurable to allow modeling of simplex or duplex communication, or a common base station with multiple users transmitting or receiving, all configurations with or without communication media impairment emulation. Each module can be configured to add a plurality of linear and non-linear impairments to a baseband signal.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: March 14, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: James Nolan, Leonid Kazakevich, Fryderyk Tyra, Robert Regis, Fred Schreider
  • Patent number: 7003098
    Abstract: A method and system for measuring the signal transmission time through a network link bounded by at least one echo canceller. The method generally includes the steps of determining a signal transmission time (tA) along a network path including the network link bounded by the echo canceller between a first endpoint and a second endpoint, transmitting a test signal from the first endpoint to the second endpoint through the network path, transmitting an echo signal which simulates the test signal from the second endpoint to the first endpoint through the network path, measuring a minimum time delay between transmission of the test signal and transmission of the echo signal which causes the echo canceller to cancel the echo signal and calculating the signal transmission time through the network link bounded by the echo canceller based on the measured minimum time delay and the determined network path signal transmission time (tA).
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: February 21, 2006
    Assignee: AT&T Corp.
    Inventor: Wallace F. Smith
  • Patent number: 6985560
    Abstract: An apparatus and method are provided for obtaining, from an analog subscriber loop, test data that may be used to test the performance of a telephony communication system. The apparatus includes a digital-to-analog (D/A) converter, a first port, a second port, and an analog-to-digital (A/D) converter. The D/A converter receives digital data and converts the digital data into a first analog signal. The first port transmits the first analog signal across a first subscriber loop to a telephony communication network. The network, via A/D and D/A conversion, translates the first analog signal to a second analog signal and transmits the second analog signal to the second port via a second subscriber loop. The A/D converter receives the second analog signal from the second port and converts the second analog signal into the digital test data, which is then used to analyze the performance of the telephony communication system.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: January 10, 2006
    Assignee: Agilent Technologies, Inc.
    Inventor: Charles J Burnett
  • Patent number: 6959069
    Abstract: A method for testing a subscriber line of a PABX (Private Automatic Branch eXchange) using a DTMF (Dual-Tone Multi-Frequency) signal. The method includes the step of controlling a DTMF transmitter in response to a line test request from an exchange operator to transmit the DTMF signal to the subscriber line, the step of receiving a component of the transmitted DTMF signal reflected from the subscriber line due to impedance mismatching, and the step of determining from a strength of the received DTMF signal component whether the subscriber line is abnormal.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: October 25, 2005
    Assignee: Samsung Electronics, Co., Ltd.
    Inventor: Kyung-Hwa Min
  • Patent number: 6917595
    Abstract: A test set includes at least one signal input port, a test circuitry, a processor, a user-input device, and a display. The test circuitry couples to and receives signals from the at least one signal input port. The test circuitry then generates test data corresponding to the received signals. The processor couples to and receives test data from the test circuitry and generates test results. The processor also couples to and receives commands from the user-input device. The processor further operatively couples to the graphical display that receives and displays the test results from the processor. In one embodiment, the test set is capable of performing line qualification and connectivity testing. A modem module can be used to facilitate connectivity testing. The modem module can be a plug-in module with a common interface to the test set. The modem module can also contain a fingerprint value that identifies the module type and the software revision number to the test set.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: July 12, 2005
    Assignee: Sunrise Telecom, Inc.
    Inventors: Paul Chang, Tom Dang, Chi Lin Wu
  • Patent number: 6915250
    Abstract: A simulation system that simulates a customer premises is disclosed that is tunable. The simulation system is comprised of a communication media simulator system and a device simulator system. The communication media simulator system receives a service provider signal from a service provider. The communication media simulator system applies a load to the service provider signal to simulate a length of communication media. The communication media simulator system varies the load to adjust the length of communication media simulated. The device simulator system applies a second load to the service provider signal to simulate at least one customer premises device.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: July 5, 2005
    Assignee: Sprint Communications Company L.P.
    Inventor: Benjamin J. Parker
  • Patent number: 6901358
    Abstract: A simulation system that simulates a length of communication media is disclosed that is tunable. Examples of communication media include wire, coaxial cable, and fiber. The simulation system is comprised of a communication media simulator system. The communication media simulator system receives a service provider signal from a service provider. The communication media simulator system applies a load to the service provider signal to simulate the length of communication media. The communication media simulator system varies the load to adjust the length of communication media simulated.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: May 31, 2005
    Assignee: Sprint Communications Company L.P.
    Inventor: Benjamin J. Parker
  • Patent number: 6898272
    Abstract: An invention is provided for testing telecommunications devices. Broadly speaking, test data is encoded prior to testing a SUT. Then, during testing, the encoded test data is transmitted to the SUT, which processes the test data. The processed test data then is received back from the SUT. The processed test data is decoded in real-time, as opposed to the encoding of the test data, which is performed offline and prior to testing. In addition, a quality of the processed test data is analyzed. Typically, the test data is speech data, which is stored prior to testing the SUT. Optionally, the speech data can be encoded offline using a computer system separate from the testing system.
    Type: Grant
    Filed: August 1, 2002
    Date of Patent: May 24, 2005
    Assignee: Spirent Communications
    Inventor: Alexander Talalai
  • Patent number: 6898557
    Abstract: A system and method are disclosed for remote testing of items where the tests are performed at a first site and monitored and controlled at a second site. A first remote test control station at the first site includes a test bench device for testing the items, and a video meeting station for viewing and controlling the test bench device. The second site includes a remote test control station, where the second remote test control station can control the testing parameters of the test equipment used by the test bench device, in near real time. The second remote test control station at the second site and the video meeting station at the first site are connected via both voice/audio links and visual links.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: May 24, 2005
    Assignee: Hewlett-Packard Development Company, LP.
    Inventor: Rudolf Wegener