Abstract: A method is described for the locationally selective transmission of a signal by radio. Both a transmitter and a receiver are synchronized to the same time reference. The receiver receiving and demodulating, at a time that is one of the specified times of the time reference, a signal transmitted by the transmitter, if the receiver has received the signal at a time that is one of the specified times. The method includes the transmitter determining a receive location within a receive zone to which it wishes to transmit the signal in selective fashion, a position in the receive zone being a function of a position of the transmitter and a signal runtime. The method also includes the transmitter transmitting the signal; and the receiver, which is situated inside the receive zone, receives and demodulates the signal.

Abstract: Embodiments include an electronic input system, which has a wearable input device having an accelerometer and circuitry configured for an operation detection mechanism and an input communication mechanism. The operation detection mechanism acquires acceleration data from the accelerometer to detect an input event. The electronic input system also has a first electronic device having circuitry for a first communication mechanism, a first event analyzer, a screen display, and a first data communication mechanism. The electronic input system also has a second electronic device having circuitry configured for a second communication mechanism, a second event analyzer, a second data communication mechanism, a screen combining mechanism, and a screen display. Embodiments also include a method of communicating an event between an input device and one or more electronic portable devices, such as the first electronic device and the second electronic device.

Abstract: Short or middle range capabilities are activated at a user device, if not already active, in response to receiving a first message initiated at the property device via a wireless wide range connection. a response message, indicating that the short or middle range capabilities of the user device are active, is transmitted to the property device, via a wireless wide range connection. In response to receiving a second message initiated at the property device and indicating a failed scanning for the user device by the property device via a wireless wide range connection, an alarm indicating movement of the property device and that the property device is located out of range for the short or middle range capabilities of the user device is activated at the user device. At the property device, failed scanning processe(s) triggers the property device to initiate alarm activation at the user device.

Abstract: A personalized (i.e., speaker-derivable) bandwidth extension is provided in which the model used for bandwidth extension is personalized (e.g., tailored) to each specific user. A training phase is performed to generate a bandwidth extension model that is personalized to a user. The model may be subsequently used in a bandwidth extension phase during a phone call involving the user. The bandwidth extension phase, using the personalized bandwidth extension model, will be activated when a higher band (e.g., wideband) is not available and the call is taking place on a lower band (e.g., narrowband).

Abstract: An apparatus comprising a transmitter at a digital subscriber line (DSL) Cabinet configured to transmit a downstream signal in a subscriber line according to a power spectral density (PSD) configuration, wherein the PSD configuration comprises a cutoff frequency based on a required data-rate of the subscriber line. Also included is an apparatus comprising at least one processor configured to implement a method comprising determining a downstream PSD for a PSD mask for a DSL, determining a cutoff frequency for the PSD profile based on a data-rate required for the DSL, and adjusting a downstream signal power on the DSL according to the PSD mask. Included is a method comprising configuring a plurality of transmitted PSDs for a plurality of Exchange deployed lines and Cabinet deployed lines by varying a plurality of cutoff frequencies corresponding to the transmitted PSDs, wherein the cutoff frequencies are varied by line, with time, or both.

Abstract: Transmission properties of a telecommunications transmission line may be estimated with improved accuracy by numerical solution for ? of Zin·j?^C=?coth(?). At least one curve is adapted to ? solutions already obtained and a starting point for numerical solution is selected in dependence of the at least one curve and in dependence of an already obtained solution close in frequency. In a first frequency range, starting points for numerical solution may be calculated from a biquadratic equation. In a second frequency range, a line in the complex plane may be adapted to solutions already obtained and new starting points selected in dependence of the line and in dependence of the previous solution. In a third frequency range, two lines in the frequency plane may be adapted to solutions already obtained and new starting points selected in dependence of the lines.

Abstract: A digital subscriber line arrangement includes a downstream modem, an upstream modem and a copper pair connection between the modems. Each modem includes electrical length estimation function code means which causes the respective modem to measure the attenuation of signals transmitted by the other modem at a plurality of different frequencies, and to combine these measurements, or functions thereof, together to form a combined attenuation measure and to use this combined measure to form an electrical length estimation, KL0bis. The downstream modem is operable to transmit its electrical length estimation to the upstream modem, and the upstream modem is operable to generate a definitive electrical length estimation in dependence upon both the received estimation from the downstream modem and the estimation made by the upstream modem. Having generated a definitive electrical length estimation, the upstream modem is operable to transmit this to the downstream modem.

Abstract: If a cellular phone with which a communication link is established is compliant with PBAP (Phone Book Access Profile), an in-vehicle navigation apparatus with a handsfree function stores and arranges, in a work memory device, phone book data transmitted automatically from the cellular phone. Thus, the newest phone book data can be made available. On the other hand, if the cellular phone is not compliant with PBAP, the in-vehicle navigation apparatus stores and arranges, in the work memory device, phone book data, which are presently stored in a storage memory device. Thus, if the presently stored phone book data, which are not newest, are desirable, they can be made available.

Abstract: A method for line management includes: acquiring running parameters of a subscriber line; computing a transmitting power spectral density, PSD, and reference virtual noise of the subscriber line according to the running parameters; activating the subscriber line according to the transmitting PSD and the reference virtual noise. A device and system for line management are provided correspondingly. Reference virtual noise needed by virtual noise technology is set rationally according to the information provided by dynamic spectrum management, DSM, Level 2 algorithm. The utilization of the virtual noise technology improves the line stability under the DSM Level 2 algorithm, and has an effect of optimizing the subscriber line.

Abstract: A system includes at least one adaptive filter coupled to a first communication channel and at least one other communications channel. The at least one adaptive filter includes at least one set of adaptive filter coefficients. A memory stores at least one predetermined set of filter coefficient thresholds. The filter coefficient thresholds may be indicative of channel faults, channel to channel faults or a length of the channel. A controller is configured to compare the set of filter coefficients to the predetermined set of filter coefficient thresholds. The controller is configured to determine the information about the channels based on compare results.

Abstract: An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals generated based on respective ones of a plurality of different frequency expansions. For example, each of the distinct probing signals may be generated based on a distinct combination of a common probing sequence and a selected one of the plurality of different frequency expansions.

Abstract: A digital logger system includes a multichannel interface circuit that: 1. concurrently and continuously-receives audio telecommunication signals for at least two telephone calls from a digital hybrid telephone line; and 2. continuously transmits linearly encoded digital audio data representing the received audio signals. A Universal Serial Bus (“USB”) hub of the system receives the transmitted digital data for retransmission to a USB root hub. A USB root hub of personal computer (“PC”) receives transmitted digital data, and executes PC software which continuously monitors the digital data for embedded line status and signaling information including a telephone line “going off hook.” When a telephone line goes “off hook,” the software records both: 1. an audio header that stores information about a telephone call; and 2. an audio file that stores compressed digital data for the telephone call. Jul. 2, 2009.

Abstract: A bipolar pulse forming transmission line module and system for linear induction accelerators having first, second, third, and fourth planar conductors which form a sequentially arranged interleaved stack having opposing first and second ends, with dielectric layers between the conductors. The first and second planar conductors are connected to each other at the first end, and the first and fourth planar conductors are connected to each other at the second end via a shorting plate. The third planar conductor is electrically connectable to a high voltage source, and an internal switch functions to short at the first end a high voltage from the third planar conductor to the fourth planar conductor to produce a bipolar pulse at the acceleration axis with a zero net time integral. Improved access to the switch is enabled by an aperture through the shorting plate and the proximity of the aperture to the switch.

Abstract: A device has a plurality of output terminals to provide a plurality of signals to a plurality of transmission links; at least one input terminal to receive information representing a projection of a complex valued error signal onto one direction; and a determination circuit, coupled to the at least one input terminal.

Abstract: A communication system adaptively cancels noise and/or interference from signals communicated through a communication channel, such as signals communicated by a telecommunication network. The system, based on a common mode signal of a received signal, generates an estimate of noise or interference within a differential mode signal of the received signal. The system then subtracts the estimate from the differential mode signal in an effort to remove noise from the differential mode signal thereby providing a differential mode signal that is substantially free of the estimated noise or interference.

Abstract: A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.

Abstract: An internet protocol telephone includes a substrate having an input and an output that are capable of being connected to the internet protocol (IP) network. A relay is disposed on the substrate and is connected between the input and the output of the substrate. The relay includes first and second native FETs that have a threshold voltage of approximately zero volts. Therefore, the relay is nominally turned-on, even when little or no voltage (or power) is applied to the IP telephone substrate, as during the discovery mode of IP telephone operation. During discovery mode, The IP phone is configured to be responsive to extended link pulses and block data packets that are associated with legacy devices. Data packets have a higher signal duration and are more continuous than extended link pulses. The IP phone includes a switchable ground that is connected to the gates of the native devices, and is controlled by a rectifier and filter circuit that are connected to the substrate input.

Abstract: A digital logger system includes a multichannel interface circuit that: 1. concurrently and continuously receives audio telecommunication signals for at least two telephone calls; and 2. continuously transmits linearly encoded digital audio data representing the received audio signals. A Universal Serial Bus (“USB”) hub of the system receives the transmitted digital data for retransmission to a USB root hub. A USB root hub of personal computer (“PC”) receives transmitted digital data, and executes PC software which continuously monitors the digital data for embedded line status and signaling information including a telephone line “going off hook.” When a telephone line goes “off hook,” the software records both: 1. an audio header that stores information about a telephone call; and 2. an audio file that stores compressed digital data for the telephone call.

Abstract: The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output.

Abstract: A bipolar pulse forming transmission line module for linear induction accelerators having first, second, third, fourth, and fifth planar conductors which form an interleaved stack with dielectric layers between the conductors. Each conductor has a first end, and a second end adjacent an acceleration axis. The first and second planar conductors are connected to each other at the second ends, the fourth and fifth planar conductors are connected to each other at the second ends, and the first and fifth planar conductors are connected to each other at the first ends via a shorting plate adjacent the first ends. The third planar conductor is electrically connectable to a high voltage source, and an internal switch functions to short a high voltage from the first end of the third planar conductor to the first end of the fourth planar conductor to produce a bipolar pulse at the acceleration axis with a zero net time integral.

Abstract: An extender circuit for handling a communication signal transmitted over a transmission line includes a voltage clamp and a current booster circuit. The voltage clamp is connected to a receive end of the transmission line and is operable to clamp a reflection signal caused by the communication signal received at the receive end of the transmission line. The current booster circuit is connected to the receive end of the transmission line and is operable to provide a boost current at the receive end of the transmission line during a positive transition of the communication signal.

Abstract: According to the invention, systems and methods are provided for analyzing the diversity of a set of critical telecommunication circuits. For example, according to one embodiment of the invention, a method is provided for analyzing the diversity of critical telecommunication circuits, the method comprising: determining a critical circuit set comprising a first critical circuit and a second critical circuit; identifying a first set of telecommunication resources associated with the first critical circuit; identifying a second set of telecommunication resources associated with the second critical circuit; and comparing the first set of telecommunication resources with the second set of telecommunication resources to determine whether the critical circuit set is diverse.

Abstract: A method for constructing a transmission line unit such that load coils can be selectively connected to a transmission line includes providing a transmission line section having a transmission line and a plurality of load coils electrically connected thereto, and connecting a switch terminal having a plurality of switches to the transmission line section. Each of the switches in the terminal is electrically connected to a respective load coil and is configured to selectively connect the respective load coil to the transmission line. Each switch may have a first switch position that connects the respective load coil in series with the transmission line, and a second switch position that disconnects the respective load coil from the transmission line. The load coils may be provided in an enclosure that is separate from the transmission line and the switch terminal. Related systems and terminals are also discussed.

Abstract: An ADSL receiver HPF architecture 300 that reduces the number of Op Amps below that required for known ADSL receiver HPFs. The ADSL receiver HPF 300 is implemented as an active RC filter to provide a single fifth-order Elliptic filter instead of the more conventional pair of third-order Elliptic filters. Since the HPF Elliptic filter stage having the lowest Q factor is reduced as the order of an Elliptic filter transfer function is increased, a single fifth-order Elliptic filter suitable for use as an ADSL receiver HPF can be implemented using only one Op Amp in the second 2nd-order HPF stage 308. A notch (imaginary zero) is provided by summing of output signals associated with active RC structure state variables. This structure minimizes the number of capacitors while preserving the capability to provide a high Q factor for the first 2nd-order HPF stage 304.

Abstract: A method and an apparatus for optical transmission line power feed interference compensation for compensating for an electrical interference signal in a power feed conductor (12; 52) and in an associated second conductor (14; 54). The interference signal may be produced by electromagnetic induction or by local variation in earth potential. The compensation is performed by producing a variable compensation signal from an electrical interference signal produced in the second conductor and inputting the variable compensation signal onto the power feed conductor, in order substantially to compensate for or cancel the electrical interference signal produced in the power feed conductor.

Abstract: A method that sends upstream a collection of data samples measured from a DSL line.

Abstract: Events that occur in a number of in domain communication channels where each channel is used by a communication service, are detected. A Bayesian Belief Network (BBN) defines a probabilistic cause-effect relationship between each cause and each effect on a victim channel. The probability of each of a number of possible causes as being a cause of interference in the victim channel is determined, by propagating observations of the interference backwards through the BBN.

Abstract: Embodiments of the present invention mitigate crosstalk by equalizing transmit signals in a data dependent fashion.

Abstract: In a voice switch, a received voice signal and a transmitted voice signal are inputted to a receiving side control section, the receiving side control section thereby produces a signal for controlling an amount of attenuation in a receiving side attenuation section. As a result, the receiving side attenuation section attenuates the received voice signal by a predetermined amount to produce a speaker output voice signal for driving a speaker. A speaker output voice signal and a microphone input voice signal are inputted to a transmitting side control section, the transmitting side control section thereby produces a signal for controlling an amount of attenuation in a transmitting side attenuation section. Consequently, the transmitting side attenuation section attenuates the speaker output voice signal by a predetermined amount to produce the transmitted voice signal.

Abstract: A method and apparatus are disclosed. The method includes one or more of the following: compiling statistical models of physical layers of a communications system; creating a priori distributions of cross-talk transfer functions; storing the models and the a priori distribution in a storage medium; and using the models and the a priori distributions to diagnose probable causes of events detected in said communications system.

Abstract: A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a telephone line. This interface can also mix and transmit low frequency voice data and high frequency digital data onto a telephone line. For POTS band frequencies, a reactive impedance coupled across the two-wire interface of the POTS line card, and serially coupled to the line side of the DSL coupling transformer, has an open state magnitude. The magnitude of the line side windings of the DSL coupling transformer is low at POTS band frequencies. POTS band signal power is therefore delivered to the POTS line card. For DSL band frequencies, the reactive impedance across the two-wire interface of the POTS line card has a closed state magnitude. The POTS line card is therefore essentially short-circuited at DSL band frequencies, and DSL band signal power is delivered to the DSL modem.

Abstract: An improved plain old telephone service (POTS) line card that may be directly connected to a customer line that is also connected to a digital subscriber line access module. A second order filter is added to the front end of the POTS line card in order to attenuate XDSL signals and to lower its amplitude. A new digital signal processor (DSP) includes further low pass filtering functions, gain compensation, termination impedance compensation and balance network compensation to provide the proper balanced network as is known in current POTS cards but not provided in current XDSL services. This card may also be used alone, without a XDSL equipped line.

Abstract: A method and apparatus for estimating transmission delay across a telecommunications network by performing a statistical analysis of conversational behavior in the network. Certain characteristic events associated with conversational behavior (such as, for example, alternative silence events, double-talk events, talk-spurt events and pause in isolation events) are identified and measured. Then, based on the proportion of time that these events occur, an estimate of the delay is calculated using a predetermined equation. Illustratively, the equation is a linear regression equation which has been determined experimentally.

Abstract: Overhead voltage is allocated in a telecommunication system among different AC signals, such as POTS, on-hook transmission POTS, PPM and XDSL signals, communicated between a telephonic switch and a user device. The allocation is based on the available overhead voltage, the condition, such as impedance, of the line carrying communications to the user, and which of the signals are to be communicated.

Abstract: The present invention relates generally to impairment detection and compensation in a communications network. One embodiment includes a method for generating an adaptive Digital Impairment Learning (DIL) sequence for use in a training mode which assists in resolving digital loss ambiguities affecting the mapping of analog levels to digital levels in a communications network. The method includes identifying a feature octet for a pair of the digital loss ambiguities, determining a number of transmit copies of the feature octet based at least in part upon a noise variance, and modifying a standard DIL sequence with the number of transmit copies of the feature octet to produce the adaptive DIL sequence for use in the training mode. Alternate embodiments relate to an apparatus for generating an adaptive DIL sequence for use in a training mode and an apparatus and method for compensating for digital losses in a communications network.

Abstract: An apparatus for reducing electromagnetic interference on signals being communicated through one or more communications conductors is disclosed. The apparatus of the present invention is preferably situated in a communications circuit having a first area for receiving one or more communications conductors and an intermediate ground, and a second area having a reference ground. The apparatus includes one or more first capacitors, where each first capacitor is coupled between a communications conductor and the intermediate ground, and a second capacitor coupled between the intermediate ground and the reference ground. In preferred embodiments, the first area is a telephone network voltage (TNV) area, the second area is a secondary extra low voltage (SELV) area, the first capacitors are regular high voltage capacitors, and the second capacitor is a Y capacitor.

Abstract: According to the invention, systems and methods are provided for analyzing the diversity of a set of critical telecommunication circuits. For example, according to one embodiment of the invention, a method is provided for analyzing the diversity of critical telecommunication circuits, the method comprising: determining a critical circuit set comprising a first critical circuit and a second critical circuit; identifying a first set of telecommunication resources associated with the first critical circuit; identifying a second set of telecommunication resources associated with the second critical circuit; and comparing the first set of telecommunication resources with the second set of telecommunication resources to determine whether the critical circuit set is diverse.

Abstract: A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.

Abstract: Disclosed herein are swizzling techniques that may provide capacitive and inductive noise cancellation on a set of signal lines. Positive noise due to a capacitive coupling between attacker signal lines and near victim signal lines is, in part, cancelled by negative noise due to inductive coupling between the attacker signal lines and a far victim signal line. Repeatable swizzling patterns are set forth to transpose near victim signal lines and far victim signal lines in subsequent segments to facilitate the capacitive and inductive cancellation. The signal lines are optionally reordered by a final swizzling to restore the set's original ordering.

Abstract: For signal level adjustment of a multitone signal received over a transmission line (1) during a training sequence in a DSL system, a programmable high-pass filter (2) is connected to the transmission line (1). A programmable gain control unit (4) is connected between the filter (2) and an A/D converter (5). A digital signal processor (6) is connected with its inputs to the A/D converter (5), with control outputs (7, 9) to control inputs (8, 10) of the filter (2), and with control outputs (11, 13) to control inputs (12, 14) of the gain control unit (4). The processor (6) detects signal level differences between the highest and the lowest tone of the multitone signal and programs the filter (2) to make the signal levels of the highest and the lowest tone equal.

Abstract: A state machine for attenuating the transition into and out of NLP state to reduce voice clipping and to reduce echo leak in a voice over packet signal transmission. The state machine interposes two additional transitional states between the NLP active state and the NLP inactive state to eliminate the sharp transition of NLP activity. An NLP entering state is used to gradually reduce the mixing ratio of echo and voice to attenuate the transition from passage of echo in the NLP inactive state to the suppression of echo in the NLP active state. An NLP exiting state is used to gradually increase the mixing ratio of echo and voice to attenuate the transition from suppression of echo in the NLP active state to passage of echo in the NLP inactive state. The rate of increase/decrease is determined based upon the signal parameters, including the presence of double talk.

Abstract: A method of controlling an echo canceller in a communications channel, is disclosed wherein input signals from the communications channel are first subbanded into a subband. Echo locations are then identified within the subband and are used to control the echo canceller. Typically, the echo canceller will be a fullband echo canceller with an adaptive filter, in which case the echo locations are used to control the filter coefficients.

Abstract: The present invention relates to a filter arrangement (8C) and a method for frequency filtering and impedance conversion. The invention makes it possible to perform frequency filtering and impedance conversion using fewer inductors than what is required using previously known technique for obtaining the corresponding effect. According to an alternative aspect the invention provides more effective frequency filtering and equivalent impedance conversion compared to the prior art when the same number of inductors are used. According to the invention an electromotive force (e′) is generated in at least one filter coil (L1, L4). The electromotive force is adjusted so that the filter arrangement (8C) receives a desired impedance converting effect. A filter arrangement according to the invention, compared to the prior art, in this manner provides a filter integrated with an impedance converter. Compared to the prior art the invention can make a saving of one transformer per impedance converter possible.

Abstract: An ADSL receiver HPF architecture 300 that reduces the number of Op Amps below that required for known ADSL receiver HPFs. The ADSL receiver HPF 300 is implemented as an active RC filter to provide a single fifth-order Elliptic filter instead of the more conventional pair of third-order Elliptic filters. Since the HPF Elliptic filter stage having the lowest Q factor is reduced as the order of an Elliptic filter transfer function is increased, a single fifth-order Elliptic filter suitable for use as an ADSL receiver HPF can be implemented using only one Op Amp in the second 2nd-order HPF stage 308. A notch (imaginary zero) is provided by summing of output signals associated with active RC structure state variables. This structure minimizes the number of capacitors while preserving the capability to provide a high Q factor for the first 2nd-order HPF stage 304.

Abstract: The sidetone noise level in a wireless or wired telephone, for example, is reduced by adjusting both noise and signal levels and/or by improving the signal-to-noise ratio of such signals.

Abstract: The present invention provides a method to reduce the crosstalk between lines assigned to a digital subscriber line (DSL) service or fat-pipe, which will then improve the signal to noise ratio (SNR) and the line reach. It can also be used to assign multiple lines to a fat-pipe, where the number of available to a fat-pipe customer is not enough for the corresponding service. The service performance can be improved through interference management by identifying those lines that are not strongly coupled, and thence assigning them to DSL service or fat-pipe, instead of using lines that are already assigned to the plain old telephone service and fat-pipe. The number of available lines for the fat-pipe customers can be increased by using lines that have already been assigned to plain old telephone service (POTS) customers, but which are not used for data transmission (DSL or fat-pipe service).

Abstract: A system and method are disclosed to mitigate the interference on DSL due to high frequency components associated with a change in a POTS condition, such as POTS ringing. In response to detecting that a potentially disruptive POTS condition is to about to occur, downstream DSL traffic can be temporarily stopped. The stoppage can include downstream traffic of voice and/or data.

Abstract: Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the crosstalk and predicting additional sources of crosstalk are disclosed. The crosstalk sources are identified in the frequency domain by maximizing the correlation with a “basis set” of received crosstalk PSDs which consist of the cascade of a finite set of known transmit PSDs types times a representative set of crosstalk couplings. Multiple crosstalk types are identified with a technique of successive spectral subtraction. Once a type is identified the crosstalk disturber is compared against all other members of the complete set for that type. Additionally, Mutliple Regression (MR) techniques and a Matching Pursuit (MP) algorithm are used to increase the ability of the system and method to identify various crosstalk disturbers.

Abstract: A load coil device for a twisted pair telephone line is disclosed. The device is for compensating distributed stray capacitance in telephone lines that are longer the 18,000 feet. Typically, a load coil device would be inserted in the line every 6,000 feet. The device includes two windings, each winding to be connected in series with one of the conductors of the telephone line. The windings flatten the frequency response of the line in the voice frequency (VF) band. The device further has a capacitor connected in parallel across each winding. The values of the capacitors are chosen to provide a low impedance path that bypasses the windings for frequencies in the range of 20 kHz to 1.1 MHz. The device is particularly useful for long telephone lines over which high speed services such as asynchronous digital subscriber line (ADSL) are to be provided.

Abstract: A signal transmission system includes a plurality of long distance signaling transfer point (L-STP) stations, each of which includes a plurality of regional signaling transfer point (R-STP) stations, each of which includes a plurality of signaling end point (SEP) stations. One of the plurality of SEP stations as an originating SEP station transmits a message to another of the plurality of SEP stations as a destination SEP station, the message having a header section including a point code of the destination SEP station as a DPC.