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| Number | Title | Issue Date |
| 8102970 | Method and apparatus for line testing 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... | 01/24/2012 |
| 8041011 | Device and method for suppressing DSL signal echo induced by bridgetap A digital signal line echo reduction adaptor is configured to connect adjacent to a first end of a bridgetap line. The bridgetap line has a second end connected to a carrier communication line. The digital signal line echo reduction adaptor reduces an effect of echo... | 10/18/2011 |
| 7436935 | Qualifying telephone lines for data transmission A system for qualifying subscriber lines in a telephony system for high speed data services. The system includes a measurement unit that makes one ended electrical measurements on the subscriber lines. Measurements on the subscriber lines are used to predict which o... | 10/14/2008 |
| 7418083 | Telecommunications line parameter estimation A fault location system for a telecommunications network including a local exchange or switch, a node such as a primary connection point and a plurality of line terminations to the customer includes probability calculation to establish the location of a fault measur... | 08/26/2008 |
| 7369566 | Method and system for DSL power saving Method and system for reducing power dissipation for data transmission from a transmitter to a receiver in a digital subscriber line (DSL) system when a rate of available data is below a first predetermined data rate for a predetermined length of time. The method in... | 05/06/2008 |
| 7362850 | Method and arrangement for estimation of line properties The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Zin(f)) as seen from the transmitter, is measured and an absolute impedance value (œ Z | 04/22/2008 |
| RE40020 | Impedance blocking filter circuit An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances above 20 KHz due to the customer's terminal equipme... | 01/22/2008 |
| 7302046 | Method for the detection of impedances and for the qualification of the telephone lines The invention relates to a method for detection of impedances, in particular along inductances, in telephone lines of the type with two metal wires as signal conductors (twisted pair), having the following method steps: a test signal in the form of an A... | 11/27/2007 |
| 7295654 | Digital kick meter and graphical user interface (GUI) A digital kick meter measures capacitive kick between two conductors and ground of a cable. The digital kick meter includes a resistance measuring circuit connectable to two of the conductors to provide a signal indicative of a capacitance between the two conductors... | 11/13/2007 |
| 7263174 | Predicting performance of telephone lines for data services A method characterizes a customer line for data transmission. The method includes measuring electrical properties of the customer line from a central location, identifying a line model from the measurements, and identifying a modem model for a modem selected for use... | 08/28/2007 |
| 7260211 | Method and circuit for adapting the impedance of an analog telecommunication connection The invention relates to a method and a circuit for adapting the impedance in a telecommunication connection comprising a speech path and a data path having modems. Conductive properties measured by the modems are used to precisely adjust the impedance on the speech... | 08/21/2007 |
| 7239687 | Telecommunications When delivering a broadband service, such as xDSL, without inband POTS, it is necessary to separate the analogue POTS signal and the xDSL signal from each other at both the CO (Central Office) and the CP (Customer's Premises). This can be achieved by using an active... | 07/03/2007 |
| 7235979 | Apparatus and method for measuring loop insertion loss single-endedly The system and method of determining insertion loss of a telephone line under test (LUT) determines a first insertion loss as a function of plurality of different equivalent circuit values of the LUT determined at a plurality of different frequencies of a first set ... | 06/26/2007 |
| 7230919 | Quality-of-service monitor for voice-over-Internet-protocol calls During voice-over-Internet-protocol calls, data are gathered about packet loss on the path over the IP network. An algorithm (in the preferred embodiment, the Sliding Window Exponential Average Algorithm) is used to evaluate the packet loss. The Sliding Window Expon... | 06/12/2007 |
| 7221754 | Switchable hybrid design for asymmetric digital subscriber line A method is provided for accomplishing asymmetric digital subscriber loop classification and the design of passive hybrid networks for each of the classes. The resulting hybrids are suitable for implementation in a switchable hybrid architecture. ... | 05/22/2007 |
| 7194024 | Method for adaptive hybrid selection during ADSL modem training The methodology accomplishes adaptive hybrid selection during ADSL modem training. The adaptive hybrid selection method maximizes performance for ADSL modems in the presence of various impairments on the line by optimally selecting the appropriate hybrid based on li... | 03/20/2007 |
| RE39432 | Impedance blocking filter circuit An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances above 20 KHz due to the customer's terminal equipme... | 12/19/2006 |
| 7149285 | Dynamic, automated double-ended system and method for testing and qualifying metallic telecommunication loops A multi-unit test system performs automated and dynamically alterable, double-ended testing of telephone lines, whose service is provided on copper cable pairs. A prescribed set of (e.g., twelve) individual tests are executed either from a hand-held measurement unit... | 12/12/2006 |
| 7099282 | Determining the effects of new types of impairments on perceived quality of a voice service Empirically derived models are used to relate user perception to objectively measurable characteristics, under a criterion of nearly perfect co-variance between predicted MOS values and the variations in the values of the objectively measurable characteristics. In t... | 08/29/2006 |
| 7099349 | xDSL-based communication system Broadband communication systems and methods of the type utilizing xDSL packet-based technologies are configured to provide packet-based point-to-multipoint communication between an upstream xDSL modem and a plurality of downstream xDSL modems. The system preferably ... | 08/29/2006 |
| 7073108 | Communications jacks including test circuits and related circuits and methods A jack for a communications line can include first and second input terminals configured to receive respective first and second conductors of a communications line, and first and second output terminals electrically coupled to the respective first and second input t... | 07/04/2006 |
| 7072385 | Load coil and DSL repeater including same Systems and methods are disclosed for improving DSL performance, including ADSL and VDSL performance, over a local loop between a telephone company central office and a customer premises. In particular, a DSL repeater is coupled to the local loop and amplifies downs... | 07/04/2006 |
| 7058305 | Optical submarine communication system and surge suppressing apparatus of the optical submarine communication system An optical submarine communication system has a land cable connected to a terminal apparatus which is installed on land near the seashore for transmitting an optical signal and electric power. The land cable is connected to an optical submarine cable through a beach... | 06/06/2006 |
| 7050548 | Localization of customer premises in a local loop based on reflectometry measurements In the course of a reflectometry-based qualification procedure of a local loop, which connects customer premises to a central office of a telecommunication network, and in the event of being unable to identify the loop termination associated with the customer premis... | 05/23/2006 |
| 7042983 | Method and apparatus for bridged tap impact analysis A method and system for qualifying telephone lines for high speed data services. The system takes measurements on a line under test and matches those measurements to a model of a line. The model of the line is used to predict whether the line will support data servi... | 05/09/2006 |
| 7027405 | System and method for broadband analysis of telephone local loop A method and system analyzes a telephone local loop and includes a central office operatively connected to the telephone local loop. A bandwidth analysis system is operatively connected to the central office and operative for determining the physical loop faults wit... | 04/11/2006 |
| 7020274 | Universal apparatus and method for interfacing signals with telephony networks A communication apparatus is used to interface signals with any one of a plurality of telephony networks having different impedances. The apparatus includes memory, a processor, a digital-to-analog (D/A) converter, and an interface port. Different sets of impedance ... | 03/28/2006 |
| 7020164 | System and method for special signaling with customer premises equipment A system and method are provided for special signaling with customer premises equipment. The system includes loop termination equipment coupled to a local loop and comprising a signal generator. The system also includes customer premises equipment coupled to the loc... | 03/28/2006 |
| 7012991 | Qualifying telephone lines for data transmission The method assesses the suitability of customer telephone lines (12, 13, 14) for data transmission. The method includes selecting a telephone line having tip and ring wires by means of a computer (30) and switch (15), and electrically connecting... | 03/14/2006 |
| 6975706 | Capacitance measurement-based mechanism for locating open telecommunication line fault To locate an open fault along a telecommunication wireline pair, a prescribed frequency tone is coupled to the wireline pair by way of a center tap of the transformer through which a line card is coupled to a subscriber loop. The line card's analog front end conduct... | 12/13/2005 |
| 6965670 | Method for optimizing the transmission properties and the power loss of a high-voltage part which is integrated in a subscriber connection circuit for connecting a subscriber connection line A method for optimizing the transmission properties and power loss of a high voltage part integrated in a subscriber line circuit for connecting a subscriber line wherein, during XDSL data transmission in the high voltage part, current sources which are integrated i... | 11/15/2005 |
| 6963641 | Method and apparatus for providing variable attenuation to data signals in an XDSL frequency range An apparatus, system and method for providing variable attenuation to data signals in an xDSL frequency range are disclosed. An attenuation device has a resistive circuit coupled to a capacitive circuit that prevents telephone signals from being attenuated by the re... | 11/08/2005 |
| 6950497 | Fault location in a telecommunications network A fault is located along a telecommunications line between the network terminating equipment and the local exchange by measuring a change in the capacitance of the line when compared with the capacitance under normal operating conditions. A geographical information ... | 09/27/2005 |
| 6925173 | Optimization of a DSL-compatible POTS line card A digital subscriber line (DSL) compatible plain old telephone service (POTS) line card that interface a telecommunications switching system to a subscriber over a two-wire subscriber line, wherein the subscriber line card detects whether a DSL line card is connecte... | 08/02/2005 |
| 6909978 | Signal pre-processing for estimating attributes of a transmission line In the process of estimating attributes of a transmission line from reflectometry measurements, small yet important reflections may be drowned in the immediate reflected signal owing to the mismatch between the reference impedance with respect to which the 1-port sc... | 06/21/2005 |
| 6907363 | Automatic insulation resistance testing apparatus An apparatus and method for automatic measurement of insulation resistances of a multi-conductor cable. In one embodiment of the invention, the apparatus comprises a power supply source, an input measuring means, an output measuring means, a plurality of input relay... | 06/14/2005 |
| 6901091 | Electronic driver circuit for directly modulated semiconductor lasers An electronic driver circuit for a directly modulated semiconductor laser has a first circuit for generating a constant current and second circuit for modulating the constant current in dependence on a digital data signal. The modulated current forms a laser current... | 05/31/2005 |
| 6876725 | Single ended line probing in DSL system SELP techniques that provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in a DSL system) are disclosed. A probe signal is transmitted over the transmission medium at one or more frequencies. A reflected version of the probe si... | 04/05/2005 |
| 6873684 | System and method for estimating the capacity of a local loop to carry data A characteristic of a local loop is used to estimate the loop's data carrying capacity. The characteristic is measured and applied to a table previously stored in memory which contains values relating the characteristic to downstream data rates. Using interpolation ... | 03/29/2005 |
| 6865257 | Method for resolving trouble in a connection having a plurality of components A computer-executable method for diagnosing trouble causes in telephone cable segments when trouble data are available only for entire cables is presented. This method diagnoses problems in the components of processes when the component location of process problems ... | 03/08/2005 |
