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| Number | Title | Issue Date |
| 8094808 | Unpowered twisted pair loopback circuit for differential mode signaling A method and apparatus provide an IP telephone or similar device with a mechanism to receive and at least briefly loop back discovery signals received from a telecommunications device such as an Ethernet switch while not permitting the loop back of data packet signa... | 01/10/2012 |
| 8077856 | Driver circuit and method for driving a signal Driver circuit for driving a transmit signal for a line comprising a signal amplifier which delivers a transmit signal, present at a signal input of the signal amplifier, amplified with a gain to a signal output, a line interface circuit which is connected between t... | 12/13/2011 |
| 7447307 | Unpowered twisted pair loopback circuit for differential mode signaling A method and apparatus provide an IP telephone or similar device with a mechanism to receive and at least briefly loop back discovery signals received from a telecommunications device such as an Ethernet switch while not permitting the loop back of data packet signa... | 11/04/2008 |
| 7397914 | Multiple path hybrid for subscriber line services A hybrid with a plurality of selectable hybrid input paths each having an associated hybrid input path filter is provided. The hybrid includes a plurality of selectable receive paths each having an associated receive path filter. The hybrid further includes a hybrid... | 07/08/2008 |
| 7330545 | Dual transformer hybrid system and method A hybrid matching system is disclosed for use with a transmitter and receiver. The hybrid matching system includes a pair of transmitter output nodes for providing a differential transmitter signal for transmission, a pair of receiver input nodes for receiving a dif... | 02/12/2008 |
| 7289488 | Method for automatically configuring a DSLAM to recognize customer premises equipment A method for automatically configuring a digital subscriber line add-drop multiplexer (DSLAM) includes receiving a request for a connection with unrecognized customer premises equipment at a DSLAM, establishing the connection between the DSLAM and the customer premi... | 10/30/2007 |
| 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 |
| 7254229 | Method and apparatus for an active impedance feedback A method and apparatus is provided for performing an active impedance feedback. A signal is received. An active feedback synthesis is performed based upon the signal. Performing the active feedback synthesis includes using an active feedback network for conditioning... | 08/07/2007 |
| 7212627 | Line interface with analog echo cancellation A line interface performs echo cancellation without the use of a hybrid filter network and includes a transmit path having a line driver, a single matching network terminating the line, and a single transformer. The transformer uses split windings on both the primar... | 05/01/2007 |
| 7149246 | Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more subcircuits on the substrate. Also included is a bias current supply coupled to the re... | 12/12/2006 |
| 7145943 | XDSL system with improved impedance circuitry An XDSL system comprising a hybrid circuit in operative communication with a transmission line and an XDSL modem associated with a subscriber premises. The hybrid circuit comprises a plurality of selectable impedance circuits having different impedance values. A con... | 12/05/2006 |
| 7123103 | Systems and method for automatic quadrature phase imbalance compensation using a delay locked loop An automatic quadrature phase compensation system comprises an on-chip analog phase sense circuit capable of detecting small differences in quadrature phase error and providing a corresponding DC voltage, a voltage-controlled or programmable phase delay circuit to i... | 10/17/2006 |
| 7109603 | Power converter system A system and method for integrating communications equipment. The system includes a power supply in which the power supply provides power to telephone equipment located in a centralized unit and at least one power converter for receiving the power from the power sup... | 09/19/2006 |
| 7110532 | Method of line matching in telecommunication networks One aspect of the invention relates to a method for line matching of analog communication lines in telecommunications networks, whereby signal processor(s) and/or programmable digital filters are used. Coefficients of the line transmission function are calculated by... | 09/19/2006 |
| 7106854 | XDSL system having selectable hybrid circuitry An XDSL system comprising a hybrid circuit in operative communication with a transmission line and an XDSL modem associated with a subscriber premises. The hybrid circuit comprises a plurality of selectable impedance circuits having different impedance values. A con... | 09/12/2006 |
| 7095801 | Phase adjustable polyphase filters A polyphase filter for wireless communication systems includes at least two phase splitting filters each having a variable resistance across their respective outputs. The variable resistance can take any suitable form, such as a MOS transistor biased in the linear (... | 08/22/2006 |
| 7088818 | Configurable analog front end for communication systems A device comprises a termination impedance circuit, coupled to a communication link. The termination impedance circuit provides a termination impedance of the device, wherein the impedance is selectable. A second device comprises an echo-cancel hybrid circuit, coupl... | 08/08/2006 |
| 7076056 | Methods and apparatus for a bridge tap moderator Methods and apparatus for protecting quality of service during a process involving bridge tap in a communications system are described. Bridge tap may occur during system construction, central office re-concentration, replacement projects, upgrade projects, expansio... | 07/11/2006 |
| 7072463 | Apparatus and method for programmable line interface impedance matching A line interface capable of connecting to a variety of transport mediums, each having a different impedance. The line interface comprises a programmable resistor. The programmable resistor along with an external resistor provide a range of resistor values which are ... | 07/04/2006 |
| 7057438 | Output circuit and semiconductor integrated circuit incorporating it therein An output circuit is provided for outputting, based on a first drive signal, an output signal with an amplitude smaller than a source voltage, comprising: a first type MOS transistor whose gate is impressed with a first drive signal and whose drain outputs a signal;... | 06/06/2006 |
| 7054279 | Method and apparatus for optimizing signal transformation in a frame-based communications network A method of and apparatus for optimizing signal transformation from a twisted pair transmission line to a combination transmitter and receiver for a frame-based communications network, the transmitter having a transmit output pair port for transmitting signals onto ... | 05/30/2006 |
| 7054372 | Digital transmission line tap circuit A digital transmission line tap circuit is provided for applying a non-intrusive tap on a digital transmission line thus allowing the transmission signal to be monitored or utilized by another piece of transmission equipment. The tap circuit incorporates all the req... | 05/30/2006 |
| 7039180 | Method and apparatus for enabling multiple protocol communication over a network A method and apparatus for enabling multiple protocol communication over a network are disclosed. A first circuit communicates first signals in a first frequency band using a first data protocol and attenuates second signals in a second frequency band using a second... | 05/02/2006 |
| 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system An adaptive interface method and apparatus for interfacing a telephony appliance such as an analog telephone, modem, fax modem, facsimile machine teleconferencing device, headset, VoIP telephone or non-compatible digital telephone to a digital, analog or hybrid tele... | 04/18/2006 |
| 7027562 | System and method to reduce echoes in voice communications A system and method to reduce echoes in voice communications are described. Input data containing return loss values of a communication trunk within a communications network is received, the return loss values being measured at each frequency of a plurality of frequ... | 04/11/2006 |
| 7006625 | Cordless telephone-to-sound card interface adapter with hybrid transformer and control circuit A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice communications over the Internet. The interface adapter includes a hybrid t... | 02/28/2006 |
| 6975723 | Architecture for minimum loop current during ringing and caller ID A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmissi... | 12/13/2005 |
| 6973183 | Method and apparatus for dynamically matching impedance In one aspect of the invention a communication device including circuitry operable to facilitate dynamic impedance matching includes an image impedance operable to be coupled to a receiver/transmitter pair associated with a line impedance. The device also includes m... | 12/06/2005 |
| 6970557 | Cordless telephone-to-sound card interface adapter having a hybrid transformer circuit A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice communications over the Internet. The interface adapter includes a hybrid t... | 11/29/2005 |
| 6917682 | Method and device for echo cancelling Echo cancelling in a communication line system, particularly an ISDN or XDSL system, is performed with a tunable hybrid having tunable passive elements. The tunable hybrid is integrated in the analog front-end portion of the communication line system. The values of ... | 07/12/2005 |
| 6823066 | Digital access arrangement circuitry and method having current ramping control of the hookswitch A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition ... | 11/23/2004 |
| 6801621 | Circuit and method for active termination of a transmission line interface An improved line driver-hybrid and method for increasing the power efficiency, signal accuracy, and stability of a transmit signal on a transmission line are disclosed. The improved line driver-hybrid uses a negative feedback control loop, thereby enhancing operatio... | 10/05/2004 |
| 6792104 | Transformer-coupled matching impedance A system for matching impedance in the circuitry of an xDSL communication device to improve noise cancellation resulting from signal leakage between transmit and receive signals. The system for matching impedance includes a transformer configured to couple an impeda... | 09/14/2004 |
| 6751315 | High bandwidth phone line transceiver with capacitor isolation A high bandwidth telephone line transceiver for connecting telecommunications equipment to a telephone line provides a pair of isolation capacitors connected to the telephone line to transmit the telephone signals across the requisite electrical isolation barrier. T... | 06/15/2004 |
| 6741700 | Low insertion loss current sense circuit A current sense circuit for sensing a current in a subscriber loop comprising a transformer having a first and second winding coupled for sensing a differential current in a loop, a sense winding for producing a sense current in response to a magnetic flux induced i... | 05/25/2004 |
| 6724890 | Adaptive transmission line impedance matching device and method An adaptive transmission line impedance matching device and method are disclosed. The device and method can be used, for example, in xDSL and home phone line network applications. The adaptive impedance matching device comprises a signal transmission section, a sign... | 04/20/2004 |
| 6697485 | Data signal attenuator and systems and methods for using same The present invention provides apparatus and methods for attenuating signals received from a source over a data transmission line, having an unknown resistance, to achieve optimized signals in various data terminal and data communications equipment. In a ... | 02/24/2004 |
| 6694017 | Automatic gain control apparatus determining echo return loss An automatic gain control apparatus, employed in a communication system having a circuit that interfaces a two-wire line to a four-wire line, measures the echo return loss occurring at the interface, calculates a gain from the echo return loss, and amplif... | 02/17/2004 |
| 6694014 | Constant impedance digital line interface circuit A digital line-interface circuit (100) presents a constant impedance to a telephone line (102) by emulating a short or a ground connection between the leads of the telephone line when the transmitter (104) is disabled. The receiver (106) includes a pair o... | 02/17/2004 |
| 6665339 | Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more, subcircuits on the substrate. Also included is a bias current supply coupl... | 12/16/2003 |
