Abstract: A testing of a transmission path of a cable connection between a first position and a second position is provided. Test signals are transmitted via the transmission path, and a transfer function is determined by evaluating the test signals. In order to assess the properties of the transmission path, the transfer function is transformed to an impulse response and the echo power of the transmission path is evaluated by analyzing the impulse response.

Abstract: A voice communication technique by which superior echo canceling can be realized even in use of non-directional microphones is provided.

Abstract: The present invention relates to an apparatus and a method for load balancing among multi-ports in reverse power feeding, and more particularly, to an apparatus and a method which, in the process in which a distribution apparatus performs load balancing among multi-ports by reversely receiving power from multiple customer premises at a distribution point, when reverse power feeding from a specific customer premise is stopped, since a power burden of a remaining customer premise is increased, which interfere with a communication service, can reduce power consumption on the distribution by releasing a link of a communication port connected with the corresponding customer premise as soon as the power feeding is stopped and provide a stable communication service by performing the load balancing only with respect to remaining communication ports.

Abstract: The invention relates to a phase detection method (200) comprising the following steps: receiving (201) a receiving sequence (Yj) of values (Y0, Y1, . . . , YN?1) of a receiving signal (Y), said values (Y0, Y1, . . .

Abstract: A system and method of determining the center of a peak of data points of an optical sensor are disclosed. The method can comprise the steps of performing an initial setup measurement of the sample points and extracting a peak; fitting the peak with a function that uses at least one of the peak's width, amplitude and center offset as fitting parameters; producing a set of linear equations which when solved calculate the optimum fit of a function to the peak assuming the previously calculated peak's width; and performing subsequent measurements of the data points to find peaks and solving the set of linear equations to determine the center of the peaks.

Abstract: A control apparatus and control method for power supply of a communication network are provided. The method includes: detecting circuit data of each power supply circuit, comparing the circuit data of the each power supply circuit to get an average value, and analyzing output circuit data that the each power supply circuit should have; adjusting an output voltage of each power supply circuit according to the output circuit data that each power supply circuit should have; and connecting output voltages of all the power supply circuits in parallel and supplying power to a next stage electrical load.

Abstract: System and techniques for sound-based call-quality detector are described herein. An audio sample can be received via a hardware interface from an on-going communication. The audio sample can be processed to produce a transcript. The transcript can be compared to a call-quality dataset to produce a call-quality degradation indication. Here, the call quality dataset includes indicia of communication quality. Network maintenance can then be performed in response to the call-quality degradation indication. The network maintenance can include adjusting a network device setting.

Abstract: Within a communication system that includes multiple communication channels, a low-power mode of operation and a higher-power mode of operation are provided. Each channel is allocated to one of several groups, based on criteria such as whether power is allocated to that channel in low power mode, and whether power was allocated to that channel in a previous high power mode. Initial power levels for each channel for each mode are approximated using an interpolation rule known to both the receive and the transmitter. The system switches between modes according to a PMD pre-defined schedule. When a new power mode begins, the receiver measures signal power received on each channel and then transmits corrective information sufficient to allow adaptation of power levels to achieve PMD pre-defined levels of received power.

Abstract: The invention provides an online real-time control method for a product manufacturing process and includes: (A) establishing a monitoring equation for estimating a product attribute in view of production line parameters corresponding to respective steps in a manufacturing process of a product; (B) when each of the steps is finished, updating the calculation result according to an online feedback value(s) of the production line parameter(s) corresponding to the finished step; (C) when the updated calculation result in the step (B) indicates that the quality of the product does not meet a required quality specification, adjusting the production line parameter(s) corresponding to the step(s) after the finished step to make the quality of the product meet the required quality specification. According to the method, a key attribute(s) of the display device can be kept within an acceptable specification by adjusting the production line parameter(s) of subsequent step(s).

Abstract: Proposed is an improved method of determining the location of a common fault on a line in a telecommunications network. An overall performance measure is generated for each of the lines in the network based on various electrical measurements, highlighting potentially faulty lines. Nodes within the network also have a performance measure calculated based on the performance measures of the lines passing through the node. Examples of nodes include cross connection points, junction boxes, cabinets, and sections of cabling. A common faulty node is identified from all nodes along a line, based on the overall performance measures associated with those nodes. Then, all other faulty lines running through that node are identified. A distance to fault measurement is estimated for each of the identified faulty lines, using capacitance measurements for each line. A common fault location is determined based on aggregating the estimated distances to fault calculated for each of the identified faulty lines.

Abstract: The electric circuit evaluation method according to the present invention comprises: a step for finding a malfunction power frequency property, in which the magnitude of a critical noise signal at which a designated electric circuit causes a malfunction is represented by the power injected into the designated electric circuit; and a step for finding a malfunction current frequency property, in which the magnitude of the critical noise signal at which the designated electric circuit causes a malfunction is represented by a current (I_LSI) flowing to a predetermined portion of the designated electric circuit, and a malfunction voltage frequency property, in which the magnitude of the critical noise signal at which the designated electric circuit causes a malfunction is represented by a voltage (V_LSI) occurring between predetermined points of the designated electric circuit, both of which properties found from the malfunction power frequency property.

Abstract: The invention generally relates to systems, devices, and methods for testing communication lines. In certain aspects, the invention provides systems and devices that include a digital/analog converter configured to operate with a computer processor and memory to send or receive an analog signal over a communication line that includes a plurality of signals having known frequencies. Inbound receiving sub-systems or devices sample the analog signal and measure a quality of the sampled, digital signal to evaluate the communication line. The key differentiator is the recognition that the human mouth and ear are intrinsically analog without encryption. By locating the test device as close to the user as possible, this system incorporates testing of complex communication streams including numerous variables and transforms (e.g. encryption, Analog to digital, Voice over IP, packet switching, ATM, SONET). Ultimately, it provides a simple interface to convert qualitative analysis to quantitative (numerical) analysis.

Abstract: According to the invention, a user connection cable (TAL) that is to be associated with a user connection circuit (SLIC) and is used for connecting at least one user (TN) to at least one communication network is verified regarding switching on of a positive distribution voltage in the strands (a, b). The user connection circuit (SLIC) is initially switched to the silent interval mode and a test impedance (I) is switched between the strands (a, b) of the user connection cable (TAL), whereupon the current (i) flowing across the strands (a, b) and the voltage (u) to ground of a strand (b) are measured. Advantageously, the measurements are taken via measuring devices disposed on the user connection subassembly (SLMA).

Abstract: A method and system for determining a number of load coils in a transmission line are provided. An impulse response of the transmission line is calculated from a characteristic impedance of the transmission line. A number of complex conjugate pole pairs of a transfer function of the impulse response is then determined. Thereby, the number of load coils in the transmission line, which is equal to the number of complex conjugate pole pairs, is determined.

Abstract: A test system for diagnosing twisted pair wiring includes a system processor in communication with a subscriber line interface module, which includes a codec and a SLIC (Subscriber Line Interface Circuit). The SLIC transmits a waveform having a frequency used for voice or baseband modem transmissions onto the twisted pair wiring. The system processor transmits a digital PCM (Pulse Code Modulation) stream to the codec, and the codec converts the digital PCM stream into the waveform transmitted onto the twisted pair wiring. In response to the transmitted waveform, the SLIC senses current on the twisted pair wiring. The codec generates an output waveform corresponding to the sensed current. The system processor receives the output waveform from the codec as a digital PCM stream, synchronizes the transmitted waveform and the output waveform at a single sample, and determines electrical properties of the twisted pair wiring from the output waveform.

Abstract: A method and a device for clustering lines of a wireline network in a number of virtual binders includes obtaining a noise value samples pertaining to different lines of the wireline network at substantially coinciding sampling moments, detecting corresponding features in these series, determining degrees of correlation between these features, and assigning the lines to one or more virtual binders on the basis of their mutual degrees of correlation.

Abstract: A method is proposed for calculating a line performance, or stability, measure for a telephone line. Various physical parameters associated with the line, such as insulation resistance, capacitance and DC voltages, are measured. The values for each of the parameters are compared to expected values, which are based on historical values measured for that line. Individual performance measures for each parameter are calculated based on the difference between the actual and expected values, normalised by the deviation of that parameter. The deviation accounts for general fluctuations across all the lines. A weighting value is also applied, based on knowledge of values relevant to the good operation of lines. The deviation effectively gives a scaling, and the weighting gives a context to the measured values for a single line. The individual performance measures are summed to get the final performance measure for the line.

Abstract: A method and system for determining a number of load coils in a transmission line are provided. An impulse response of the transmission line is calculated from a characteristic impedance of the transmission line. A number of complex conjugate pole pairs of a transfer function of the impulse response is then determined. Thereby, the number of load coils in the transmission line, which is equal to the number of complex conjugate pole pairs, is determined.

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 modem or associated computing or testing device is configured to detect the presence of one or more faults that affect DSL communications, and upon their detection, generate, for example, an indication, communication or message that recommends corrective action. In this context, a fault is generally caused by one or more unfiltered devices, impulsive noises, malfunctioning modems, or other factor that does not affect measured attenuation or measured noise, but does affect the signal-to-noise ratio (SNR) of the link. In addition to being able to generate a message guiding a user through corrective action, the system can estimate the rate impact of the detected fault.

Abstract: A method, apparatus and computer readable medium for call quality testing is presented. A query is transmitted over a communications network from a first location to a second location. The query results in an audio signal at the second location, which is received at the first location. The audio signal is analyzed by comparing the signal with a reference signal clip. A statistical parameter is generated, the statistical parameter indicative of a quality of the received signal.

Abstract: The invention generally relates to systems, devices, and methods for testing communication lines. In certain aspects, the invention provides systems and devices that include a digital/analog converter configured to operate with a computer processor and memory to send or receive an analog signal over a communication line that includes a plurality of signals having known frequencies. Inbound receiving sub-systems or devices sample the analog signal and measure a quality of the sampled, digital signal to evaluate the communication line. The key differentiator is the recognition that the human mouth and ear are intrinsically analog without encryption. By locating the test device as close to the user as possible, this system incorporates testing of complex communication streams including numerous variables and transforms (e.g. encryption, Analog to digital, Voice over IP, packet switching, ATM, SONET). Ultimately, it provides a simple interface to convert qualitative analysis to quantitative (numerical) analysis.

Abstract: A network audio testing system and a network audio testing method thereof for testing the performance of a network communication system during communication are disclosed. The system includes a processing system and a sound simulation device. The processing system is for generating a near-end simulation signal and a far-end simulation signal. The sound simulation device is for receiving and making a near-end simulation sound. The near-end simulation sound is received by a microphone of the network communication system to generate a first test signal. The processing system further simultaneously makes the sound simulation device sounding the near-end simulation sound and a speaker sounding a far-end simulation sound to obtain a second test signal. The processing system compares the first and the second test signal to obtain an attenuation degree of the near-end simulation signal and a residual energy of the far-end simulation signal.

Abstract: A method includes identifying one or more second digital subscriber lines from one or more first digital subscriber lines based on historical performance data. The one or more second digital subscriber lines are identified based on degraded performance that is determined using first performance information for the one or more first digital subscriber lines. The method includes applying a line profile to the one or more second digital subscriber lines. The method includes storing second performance information associated with the one or more second digital subscriber lines. The method includes sending information to a remote computing device.

Abstract: A portable signal testing system includes a transmitter, a first dynamically tunable receiver, a second dynamically tunable receiver, a first indicator and a second indicator. The transmitter transmits over a wired communications link a first signal having a corresponding first frequency representative of a first frequency range of the wired communications link, and transmits over the wired communications link a second signal having a corresponding second frequency representative of a second frequency range of the wired communications link. Signal losses for the first signal and second signal are measured, and indicators indicate whether the signal losses are acceptable.

Abstract: A modem or associated computing or testing device is configured to detect the presence of one or more faults that affect DSL communications, and upon their detection, generate, for example, an indication, communication or message that recommends corrective action. In this context, a fault is generally caused by one or more unfiltered devices, impulsive noises, malfunctioning modems, or other factor that does not affect measured attenuation or measured noise, but does affect the signal-to-noise ratio (SNR) of the link. In addition to being able to generate a message guiding a user through corrective action, the system can estimate the rate impact of the detected fault.

Abstract: A system and method for provide a stable gain from an adaptive gain control device in a signal path. An echo canceller is also located in the signal path, and is used to provide performance information regarding losses in the signal. This performance information is fed to the automatic gain control device via a connection. The automatic gain control device thereafter uses the performance information to determine a maximum gain that might be provided based upon losses cause by echo conditions. The gain however is limited in order to provide for a stable system. The performance information includes a loss rate that includes a combination of the echo return loss and the echo return loss enhancement.

Abstract: A method for determining reference virtual noise of Digital Subscriber Line (DSL), includes: obtaining a receiver-end-actual noise of DSL subcarriers; and determining a reference virtual noise according to the obtained receiver-end-actual noise of the DSL subcarriers. Furthermore, the invention also discloses a device for determining a reference virtual noise of DSL, and a method and a system for configuring the reference virtual noise of DSL. The invention can improve the accuracy of the reference virtual noise, thereby making the configuration of the reference virtual noise more accurate.

Abstract: A method for analyzing the status of a subscriber loop belonging to an access network portion of a fixed network infrastructure, the subscriber loop not supporting a broadband service wherein the access network portion includes further subscriber loops, a set of which support broadband services. The method includes the steps of collecting attenuation measures associated with said set of subscriber loops supporting said broadband services; and processing said attenuation measures to obtain an estimation of a maximum bit rate that can be offered on the subscriber loop to be analyzed.

Abstract: The present invention discloses circuits for isolating and attenuating signals generated by a telephone network. In disclosed embodiments, a metering pulse signal is isolated from the terminals of the connecting device, and then attenuated with an impedance that is synthesized with a programmable digital signal processor. Embodiments also utilize the digital signal processor to synthesize a termination impedance for the connecting device. The termination impedance matches closely the characteristic impedance of the network, so as to minimize wave reflections and the like.

Abstract: A method includes selecting a first set of digital subscriber lines (DSLs) supported by a digital subscriber line access multiplexor (DSLAM). The DSLs of the first set exhibit reduced performance based on historical performance data. The method includes sending a request to the DSLAM for a first performance parameter for each of the DSLs of the first set. The method includes receiving the first performance parameters. The method includes removing DSLs from the first set that have suitable performance based on the first performance parameters to create a second set of DSLs. The method includes selecting a line profile to apply to the second set of DSLs. The method also includes sending a second request to the DSLAM to apply the line profile to the DSLs of the second set and then to determine a second performance parameter for each of the DSLs of the second set.

Abstract: The present invention concerns methods for estimating one or more transmission properties of a telecommunications transmission line. Estimates of the line input impedance, Zin at a frequency ƒ, and the line capacitance ? are made. An estimate is then made in dependence of ?, the frequency ƒ and a value ?, where ? satisfies the relationship ? coth (?)=Zin·j??, and ?=2?ƒ. Accuracy may be improved by least squares fitting a curve to a set of intermediate values and then generating an estimate from the coefficients of the curve.

Abstract: A communication apparatus including: a semiconductor DAA which performs line closing and opening processings; and a controller including; an adjustment controlling section which controls the semiconductor DAA such that a line voltage and a line current upon closing a line fall within a predetermined range; an adjustment-control starting section which starts the control; an adjustment-control stopping section which stops the control; and a change detecting section which detects a change of conditions of supply of the line voltage, wherein the adjustment-control starting section starts the control where the line closing processing has been performed and where the change has been detected, and wherein the adjustment-control stopping section stops the control when a predetermined length of time has passed, in at least one of where the line closing processing has been performed and the control is being performed, and where the change has been detected and the control is being performed.

Abstract: A signal testing apparatus includes a transmitter, a first receiver, a second receiver, a first indicator and a second indicator. The transmitter transmits over a wired communications link a first signal having a corresponding first frequency representative of a first frequency range of the wired communications link, and that transmits over the wired communications link a second signal having a corresponding second frequency representative of a second frequency range of the wired communications link. Signal losses for the first signal and second signal are measured, and indicators indicate whether the signal losses are acceptable.

Abstract: A FDR SELT measurement is made in a stop band of a DSL band plan, using a PSD allowed by the PSD mask. Further measurements may also be made in an adjacent pass band and further bands, and the results combined to create a wide-band measurement result. When transformed into the time domain (e.g. by inverse Fourier transform to produce the line impulse response) greater resolution in time (and hence greater spatial resolution) is achieved. In order to compensate for AGC calibration errors measurements using different AGC steps may be scaled to fit smoothly to each other. If measurements overlap, measurement results in the region of overlap may be combined in various ways to limit the influence of noise and to create a smooth transition from one measurement to the next.

Abstract: A method for extending transmission distance of an ADSL signal includes: increasing power spectral density (PSD) of an ADSL signal when a parameter of the ADSL signal is equal to or greater than a preset threshold; and sending the ADSL signal with the increased PSD. A system for extending transmission distance of ADSL signal includes a PSD adjustment determining unit, a PSD adjusting unit and a transmitting unit. A method for promoting transmission rate of an ADSL signal is disclosed as well. The solution extends the coverage of the ADSL signal, and when the CO increases the downlink PSD, the CEP need not to be modified, which reduces the cost.

Abstract: Apparatus and methods are provided for measuring perceptual quality of a signal transmitted over a communication network, such as a circuit-switching network, packet-switching network, or a combination thereof. In accordance with one embodiment, a distributed apparatus is provided for measuring perceptual quality of a signal transmitted over a communication network. The distributed apparatus includes communication ports located at various locations in the network. The distributed apparatus may also include a signal processor including a processor for providing non-intrusive measurement of the perceptual quality of the signal. The distributed apparatus may further include recorders operatively connected to the communication ports and to the signal processor, wherein at least one of the recorders processes the signal at one of the communication ports and the recorder sends the signal to the signal processor to measure the perceptual quality of the signal.

Abstract: A communication system comprises a network server connected to a telephone at a customer premises via a subscriber line. The server is further connected to a cellular communication device through a cellular network. Upon installation of telephony equipment at the customer premises, a service technician uses a cellular communication device to communicate with the server of the network such that the server initiates a voice call to the telephone via the subscriber line. The technician then takes the telephone off hook, aligns a speaker of the cellular communication device with a microphone of the telephone, and aligns a microphone of the cellular device with a speaker of the telephone such that the telephone and the cellular device are acoustically coupled. A plurality of acoustic tones are communicated between the telephone and the cellular communication device in order to test the quality of the inbound and/or outbound connections for the telephone.

Abstract: A method and system for managing a line topology is provided by the embodiments of the disclosure. The method for managing a line topology includes obtaining an actual transfer function of the line according to the actual transfer function of the line and a transfer function of the bridge tap model, estimating a diameter and length of the bridge tap of the line and a diameter and length of the trunk line of the line according to the estimated diameter and length of the bridge tap and the diameter and length of the trunk line, obtaining a transfer function of the line model that includes the location parameter of the bridge tap by comparing the error between the actual transfer function and the transfer function of the line model which includes the location parameter of the bridge tap, estimating the position of the bridge tap according to the estimated diameter and length of the trunk line and the diameter and length of the bridge tap and the location of the bridge tap, and generating a topology of the line.

Abstract: Disclosed are various embodiments for determining a state of loop termination. One embodiment comprises receiving an un-calibrated echo signal for the loop under test using frequency domain reflectometry single-ended line testing (FDR-SELT) and determining the state of loop termination based on phase of the un-calibrated echo signal. The step of determining the state of loop termination comprises determining whether the loop is terminated by an open termination or a short termination by correlating the phase of the echo signal with an expected phase of the echo signal derived from measurements taken at the same loop length for open and short terminations. For other embodiments, the amplitude of the un-calibrated echo signal is analyzed to determine whether the loop is terminated by a matched-impedance termination.

Abstract: A signal testing apparatus includes a transmitter, a first receiver, a second receiver, a first indicator and a second indicator. The transmitter transmits over a wired communications link a first signal having a corresponding first frequency representative of a first frequency range of the wired communications link, and that transmits over the wired communications link a second signal having a corresponding second frequency representative of a second frequency range of the wired communications link. Signal losses for the first signal and second signal are measured, and indicators indicate whether the signal losses are acceptable.

Abstract: A method for evaluating the integrity of a cable shield utilizing wideband noise-to-ground measurements is provided. Upon determining that trouble with the cable shield exists, a method s is provided to isolate the location of the trouble with the cable shield. The method utilizes access locations along the cable and therefore does not require opening of the cable shield to isolate the trouble in the shield.

Abstract: The present invention provides a wiring degradation detector for use with telephone wire-pairs providing electric power. In one embodiment, the wiring degradation detector includes a transmission section configured to transmit load power over the telephone wire-pairs. Additionally, the wiring degradation detector also includes a test section coupled to the transmission section and configured to provide a load power test signal that determines a condition of the telephone wire-pairs. In an alternative embodiment, the wiring degradation detector further includes a degradation monitoring section coupled to the test section and configured to track values of the condition of the wiring over time.

Abstract: A system and method for assisting telephone service technicians in repairing communications lines may include storing test parameters for testing operation of a communications line. An operational parameter of communications over the communications line may be tested and a determination as to whether the operational parameter meets an operational criteria established by at least one of the test parameters may be made. The measured operational parameters and a test result indicator may be stored. If the operational parameter met the operational criteria, then an indication that the operational parameter passed a test may be made. Otherwise, (i) an indication that the operational parameter did not pass the test, (ii) possible causes for the operational parameter failing the test, and (iii) recommendations for correcting at least one possible problem that lead to the operational parameter not passing the test may be displayed for a technician.

Abstract: An apparatus comprising an artificial noise (AN) controller coupled to a digital subscriber line (DSL) transmitter and configured to adjust an AN level for a signal transmitted by the DSL transmitter, wherein the AN level is adjusted based on an actual signal to noise ratio (SNR) of the signal from the receiver to achieve a desired SNR for the signal. Also disclosed is a method comprising maintaining a data rate in a line at about a desired level by adjusting an AN level in a transmitted signal based on a SNR of a received signal.

Abstract: A signal testing apparatus for testing signals includes at least one receiver that receives signals having corresponding frequencies representative of a frequency range of a wired communication link over which the signals are received. The signal testing apparatus also includes a measurer that measures a signal loss for each of the frequencies to determine whether each measured signal loss is acceptable.

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 line measurement method is provided. The method includes obtaining data of relation between a line length and an insertion loss phase radian, and obtaining data of relation between the line length and a loop attenuation parameter value; obtaining four length values from the data of relation between the line length and the insertion loss phase radian, and defining a length range to obtain the first and the second length range; and determining the boundary of the second length range close to a midpoint of the first length range, using a line length value corresponding to the boundary close to the midpoint as a measured line length, and using a line diameter corresponding to the line length value as a measured line diameter.

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.

Abstract: A method of testing a communication line includes measuring a first voltage/current couple on the communication line, measuring a second voltage/current couple different from the first couple on the communication line, and calculating a resistance based on the first couple and the second couple.