Abstract: A TDD signal booster includes first and second bidirectional terminals and an amplifier circuit arranged in a signal path between said first and second terminals. The amplifier circuit is to amplify TDD signals received at one of said first and second terminals for transmission from the other of said first and second terminals. The amplifier circuit is operable in a first configuration for amplifying TDD signals in one direction along the signal path and a second configuration for amplifying TDD signals in the opposite direction along the signal path. A control circuit is arranged to detect a silent period in said TDD signals, e.g. the guard period, and, in response to detecting the silent period, control said amplifier circuit to change configuration.

Abstract: A multifunctional amplifier for Time Division Duplex signals and Frequency Division Duplex signals in Very High Bit-Rate Subscriber Line, is disclosed. The multifunctional amplifier may include a first and second bidirectional terminals, at least one first filter connected between said first and second bidirectional terminals for bypassing signals in a first configuration, an amplifier circuit arranged in a signal path between first and second bidirectional terminals to amplify said signals, the amplifier circuit being operable in a second configuration for amplifying said signals in one direction along the signal path and a third configuration for amplifying said signals in the opposite direction along the signal path, and a control circuit arranged to control said amplifier circuit to change configuration.

Abstract: A system and method are provided herein for managing an amplifier at an intermediate location in a twisted pair line between a digital subscriber line (DSL) access multiplexer and a customer premises equipment, for high data rate broadband operation. The system may include a DSL access multiplexer, an amplifier, a local communication interface and a host computer, programmed to execute an element management system service application.

Abstract: A multifunctional amplifier for Time Division Duplex signals and Frequency Division Duplex signals in Very High Bit-Rate Subscriber Line, is disclosed. The multifunctional amplifier may include a first and second bidirectional terminals, at least one first filter connected between said first and second bidirectional terminals for bypassing signals in a first configuration, an amplifier circuit arranged in a signal path between first and second bidirectional terminals to amplify said signals, the amplifier circuit being operable in a second configuration for amplifying said signals in one direction along the signal path and a third configuration for amplifying said signals in the opposite direction along the signal path, and a control circuit arranged to control said amplifier circuit to change configuration.

Abstract: A method for estimating downstream gain and upstream gain of an amplifier at an intermediate location in a twisted pair line between a DSL Access Multiplexer (DSLAM) and a customer premises equipment (CPE) for high data rate broadband operation. The method includes: an offline calibration process for obtaining offline tables, and an estimation process including: setting the downstream gain and the upstream gain to a set of predefined gains in the twisted pair line when activated and getting an indication if the line is in ShowTime. In case the line is in ShowTime, the estimation process further measures the downstream/upstream signal level, estimates the distance from the amplifier to the CPE and distance from the amplifier to the to the CPE and the distance from the amplifier to the DSLAM, and obtains the upstream/downstream gains.

Abstract: A TDD signal booster includes first and second bidirectional terminals and an amplifier circuit arranged in a signal path between said first and second terminals. The amplifier circuit is to amplify TDD signals received at one of said first and second terminals for transmission from the other of said first and second terminals. The amplifier circuit is operable in a first configuration for amplifying TDD signals in one direction along the signal path and a second configuration for amplifying TDD signals in the opposite direction along the signal path. A control circuit is arranged to detect a silent period in said TDD signals, e.g. the guard period, and, in response to detecting the silent period, control said amplifier circuit to change configuration.

Abstract: A system and method are provided herein for managing an amplifier at an intermediate location in a twisted pair line between a digital subscriber line (DSL) access multiplexer and a customer premises equipment, for high data rate broadband operation. The system may include a DSL access multiplexer, an amplifier, a local communication interface and a host computer, programmed to execute an element management system service application.

Abstract: A method for estimating downstream gain and upstream gain of an amplifier at an intermediate location in a twisted pair line between a DSL Access Multiplexer (DSLAM) and a customer premises equipment (CPE) for high data rate broadband operation. The method includes: an offline calibration process for obtaining offline tables, and an estimation process including: setting the downstream gain and the upstream gain to a set of predefined gains in the twisted pair line when activated and getting an indication if the line is in ShowTime. In case the line is in ShowTime, the estimation process further measures the downstream/upstream signal level, estimates the distance from the amplifier to the CPE and distance from the amplifier to the to the CPE and the distance from the amplifier to the DSLAM, and obtains the upstream/downstream gains.

Abstract: A system and method for providing a service over a repeatered link that couples a service provider transceiver to a remote modem, the method includes: computing, for each frequency bin out of multiple frequency bins of a spectrum, a level of far-end cross-talk (FEXT) interference that is generated to a network-side receiver of a frequency division multiplexing (FDM) discrete multi tone (DMT) repeater by a service provider transmitter that provides an FDM DMT service that is supported by the FDM DMT repeater; computing, for each frequency bins out of the multiple frequency bins, a highest allowable transmit power level of a customer-side transmitter of the FDM DMT repeater that generates to the network-side receiver of the FDM DMT repeater a cross-talk interference that does not exceed a level of FEXT interference that is generated to the network-side receiver of the FDM DMT repeater by the service provider transmitter.

Abstract: A system and method for transmitting and recovering external clock signals over links of a DSL system in which the external clock signals are used to synchronize transmitted physical layer signals from a CO of a DSL system and said external clock signals are derived from the received physical layer signals at an RT/CPE location of a DSL system. A clock recovery subsystem located at both the CO and the RT/CPE comprises a clock monitor circuit in communication with a Phase Lock Loop circuit. The clock monitor circuit at the RT/CPE is able to derive clock signals from the received physical layer signals and select one of said derived clocks to which a local reference clock at the RT/CPE is synchronized. The synchronized local reference clock, which can exist even when there are no valid derived clocks, may be used to transmit pseudowire frames (e.g., TDM data over Ethernet).

Abstract: Mitigation of spectral interference in communications systems such as Digital Subscriber Loop (DSL) systems, and in particular mitigation of spectral interference using dynamic spectral shaping (DSS) in DSL systems, and in particular Single-pair High-speed DSL (SHDSL) systems.

Abstract: A DSL communication system and a method for configuring a DSL communication system. The method includes training at least one anchor DSL modem transmitter to transmit information over at least one anchor line at an anchor bit rate that is determined based on an allowable tolerable noise level and a minimum allowable signal-to-noise ratio (SNR) margin; training one or more other DSL modem transmitter to transmit information over one or more other line at a bit rate that is determined by a current noise level and a target SNR margin, wherein the target SNR margin is higher than the minimum allowable SNR margin; and transmitting information by at least one trained DSL modem transmitter to at least one DSL modem receiver.

Abstract: In a communications system having a first modem transmitting via a communications channel, a method for adding a second modem, the method including learning crosstalk caused by transmissions from the first modem to the second modem while the second modem is in a transmitting state insufficient to cause crosstalk interference to the first modem in accordance with a predefined measure, deriving from the learned crosstalk an estimation of crosstalk that would be caused by the second modem to the first modem when the second modem is in a transmitting state, configuring the first modem to cancel crosstalk according to the crosstalk estimation, causing the second modem to enter a transmitting state sufficient to cause crosstalk interference to the first modem in accordance with a predefined measure, and causing the first modem to at least partially cancel crosstalk caused by the second modem in accordance with the crosstalk estimation.

Abstract: In a communication medium including a first set A of n communication channels and a second set U of m communication channels, a method for selecting sensor channels in A for quantifying crosstalk from U, including operating A in a receive-only mode (FIG. 2 Step of Initialize Modem pool A. Work in receive-only mode.), choosing a subset S1 of A, estimating the expansion coefficients of A as a predefined function of subset S1 and signals received by A (FIG. 2 Step of Choose a set S1 of m modems in A and estimate the expansion coefficients gjj of modems in A relative to S1), choosing a candidate subset S2 of size m of A where the determinant of a matrix of the expansion coefficients corresponding to the subset S2 is greater than that of the expansion coefficients corresponding to any other subset of size m of A divided by a predefined bound D (FIG. 2 Step of Choose an initial candidate subset S2 where det (AS2) det (AS)/D), calculating a threshold alpha, choosing a final subset S2 that is an -amplifier of (FIG.

Abstract: A forward error correction method including inserting at least one filler symbol into an input data stream at a pre-determined position, thereby generating a precoded symbol group, FEC encoding the precoded symbol group, thereby generating a code word, removing at least one of the filler symbols from the code word, thereby generating an optimized code word, inserting at least one filler symbol into the optimized code word at the predetermined position, thereby generating a deoptimized code word, FEC decoding the deoptimized code word, thereby generating a decoded symbol group, and removing at least one of the filler symbols from the decoded symbol group, thereby generating an output data stream.

Abstract: In a communication medium including a first set A of n communication channels and a second set U of m communication channels, a method for selecting sensor channels in A for quantifying crosstalk from U, including operating A in a receive-only mode (FIG. 2 Step of Initialize Modem pool A. Work in receive-only mode.), choosing a subset S1 of A, estimating the expansion coefficients of A as a predefined function of subset S1 and signals received by A (FIG. 2 Step of Choose a set S1 of m modems in A and estimate the expansion coefficients gij of modems in A relative to S1), choosing a candidate subset S2 of size m of A where the determinant of a matrix of the expansion coefficients corresponding to the subset S2 is greater than that of the expansion coefficients corresponding to any other subset of size m of A divided by a predefined bound D (FIG. 2 Step of Choose an initial candidate subset S2 where det (AS2) det (AS)/D), calculating a threshold alpha, choosing a final subset S2 that is an -amplifier of (FIG.