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7324632 Distribution device in a data signal processing installation, and data signal processing installation  
The invention relates to a distribution device ( 2 ) in a data signal processing installation ( 1 ), and a data signal processing installation ( 1 ). The distribution device comprises a...
7263646 Method and apparatus for skew compensation  
A method that measures a skew between a data signal and a clock signal at a receiving end of a serial link and then adjusts a phase relationship between the data signal and the clock signal to...
7257758 Stumping mechanism  
An Infiniband device can have an input port operable to receive a packet and to forward the packet to an output port of the device for onward transmission toward an ultimate destination of the...
7254230 Subscriber line interface circuitry  
A subscriber line interface circuit apparatus includes a signal processor having sense inputs for sensed tip and ring signals of a subscriber loop. The signal processor generates linefeed driver...
7242761 System and method for determining the transmit power of a communication device operating on digital subscriber lines  
A system for determining the transmit power of a communication device operating on a twisted pair subscriber line includes a communication server coupled to a first subscriber line and a second...
7215764 Current sensing echo cancellation device  
A passive echo cancellation circuit for reducing echoes on a subscriber line includes an output driver adapted to drive a downstream signal on the subscriber line. First sensing circuitry is...
7191378 Method and system for providing low density parity check (LDPC) encoding  
An approach is provided for a method of encoding structure Low Density Parity Check (LDPC) codes. Memory storing information representing a structured parity check matrix of Low Density Parity...
7184543 Method and circuit arrangement for controlling a subscriber line interface circuit  
The invention provides a method for controlling a subscriber line interface circuit, which is connected to at least one data line and to at least one subscriber line associated with a subscriber,...
7162029 Gain or input volume controller and method utilizing a modified R2R ladder network  
A gain or input volume controller and method includes a modified R2R ladder network having a number of R2R branches, switches coupled respectively to the R2R branches, and a switch controller for...
7110531 Isolation system with analog communication across an isolation barrier  
An isolation system with analog communication across an isolation barrier includes an isolation barrier circuit having at least one isolation element; a digital to analog circuit having an analog...
7095847 DC/DC converter and subscriber line interface circuit  
A DC/DC converter capable of preventing abnormal temperature increase in a power transistor. The DC/DC converter comprises a loop circuit, a power transistor, an abnormal high temperature detection...
7085372 Method and device for transmitting a transmission signal via a two-core line  
Method and apparatus for transmitting a transmission signal via a two-core line, in particular a telephone line, in which case, with the aid of corresponding transmission devices ( 2, 3 ), two...
7076260 Unbalanced coding for cordless telephony  
In a digital cordless telephone system, a different speech coding scheme is used in the audio path from the base unit to its remote handset than that which is used in the audio path in the opposite...
7068756 Multi-interface telephony test system using separate interface cards  
The present invention provides a method to configure the hardware and software resources in a system to utilize two physical interface boards in pairs such that their aggregate units of voice...
7062037 Generic line impedance matching circuit using decomposed configurable transfer functions  
A technique for implementing impedance matching circuits 100 that use the transfer functions of each line impedance model. This technique allows implementation of an impedance match for a diverse...
7046793 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....
7031458 Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling  
The present invention is directed toward a method and apparatus for transferring data across an isolation barrier using high speed analog encoded signals. A line side circuit interfaces with tip...
7027589 Single-ended loop test circuitry in a central office DSL modem  
A central office modem ( 50 ) that includes the capability of single-ended loop testing (SELT) is disclosed. The modem ( 50 ) includes a digital signal processor ( 54 ), a codec ( 56 ), line driver...
7024157 Local area network computer system utilizing radiating transmission line  
A radio frequency communication system utilizing a radiating transmission line for communicating data signals is disclosed. The data signals convey digital data to remotely located data devices,...
6999581 Event detection circuit  
A network interface circuit that screens out transient signals and provides an indication to the line side that an actual event has occurred, so that appropriate discrimination circuitry is powered...
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...
6940969 Capacitor cancellation method and apparatus  
A capacitor cancellation method and apparatus for use in an interface circuit having a transformer blocking capacitor. The method includes sensing a voltage across the transformer blocking...
6937852 Portable communication device  
A portable communication device for conference calls, comprising at least first and second speech encoder paths with first and second inputs for connection to first and second recording devices,...
6931121 Dual personality analog port  
An RJ 11 port is disclosed that detects the device to which it is connected and automatically reconfigures itself as end user equipment or network interface equipment.
6925172 Line interface with gain feedback coupled matching impedance  
A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a transmitter input coupled to an input of a transmission...
6920218 Combination clock and charge pump for line powered DAA  
Disclosed is a method and apparatus which facilitates the use of existing power that is ordinarily unused or discarded to provide power to a telephone interface circuit when the circuit is in the...
6909781 DSL line tester  
An analog front end system comprising a digital-to-analog converter, a line driver, a multiple-input device, and an analog-to-digital converter is presented. Furthermore, a method for DSL line...
6888939 Circuit for joint transmitting voice and data over a telephone line  
The invention relates to an SLIC circuit ( 1 ), which is connected directly to a telephone line ( 2 ), for joint transmission of voice and data via the telephone line ( 2 ), with adequate echo...
6853724 Cascade low-pass filter to improve xDSL band attenuation for POTS splitter  
Cascade low-pass filters are useful in attenuating the xDSL band in a POTS splitter. The design of the low-pass filter is a sixth-order filter having two stages. A first stage includes a...
6847702 Systems and methods for enhanced reliability in a communication system  
Disclosed are systems and methods for transferring data between servers and subscribers. A central office employs DSL circuit cards. Each DSL circuit card encodes a digital signal using a discreet...
6826278 Central office interface techniques for digital subscriber lines  
A digital subscriber line and POTS voice interface between a telephone line and central office equipment is provided. For POTS band frequencies, a reactive impedance coupled across the two wire...
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....
6782095 Method and apparatus for performing spectral processing in tone detection  
A general purpose network tone detection method and apparatus that allows the precise and accurate recognition of North American tones (MF, DTMF (Dual-Tone Multifrequency), and CPT (Call Progress...
6778665 Distribution of current draw in a line powered DAA  
A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying...
6760433 Central office interface techniques for digital subscriber lines  
Techniques for interfacing a telephone line and central office equipment of a network operator providing and digital subscriber line data services are disclosed. The interface is splitterless in...
6744888 Line interface circuit with event detection signaling  
A telephone line interface circuit with event detection capabilities is provided that screens out transient signals and provides an indication to the line side that an actual event has occurred; so...
6735305 Detection of low tip/ring currents in a line powered DAA  
A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying...
6731751 Apparatus for cordless computer telephony  
An interface apparatus interposed between a cordless telephone base unit and a personal computer sound card. Such interface emulates a Central Office connection with respect to the telephone and a...
6728309 Method and apparatus for high speed data transmission over a four-wire subscriber line  
Disclosed is an architecture and method for high speed transmission over a four-wire subscriber line. Each modem in the present invention includes a V.90 transmit section and a V.90 receive...
6687371 Maintaining an off-hook condition during a call bridge  
A line powered codec which adaptively allows operation with power supplied from a telephone line in many countries as conditions warrant. A startup procedure uses country-specific register...
6674857 Startup procedure for international line powered DAA  
A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying...
6665398 Programmable subscriber loop interface circuit and method  
A subscriber loop interface circuit and method for externally programming the on-hook, off-hook, and transition states of the subscriber loop interface circuit. The circuit having an off-hook...
6556676 Adapter card implementing a time-shared digital signal processor  
The invention provides an adapter card for use with a computing apparatus executing in a multitasking environment program elements that implement call-related functional units requiring DSP...
6553118 Method and apparatus for calculating DC offset in a digital gyrator  
A method and apparatus for controlling the DC line current on a telephone line and reducing the amount of error introduced to the system. The error is reduced by compensating for a DC error term...
6507654 Line interface battery feed arrangements with PTC resistors  
A telephone line interface circuit is disclosed that functions with use of PTC resistors so that temperature increases within the battery feed resistors is minimized. Utilizing current and voltage...
6498849 Arrangement in a subscriber line interface circuit  
To reduce power losses in a SLIC comprising first and second current amplifiers supplying line current to respective wires of a two-wire transmission line to a load, a line current detector detects...
6483914 Telephone filter arrangement  
A subscriber's telephone installation comprises a plurality of telephone sets coupled in parallel to a subscriber loop so as to provide a voice facility, and a data modern coupled to the subscriber...
6480602 Ring-detect interface circuitry and method for a communication system  
Ring-detect interface circuit is disclosed for digital DAA circuitry to provide a plurality of selectable signals, including a ring monitor signal, on a ring-detect output pin. The interface...
6453040 Telephone adapter and telephone system providing multiple telephone lines  
An adapter ( 42 ) for connecting a telephone ( 52 ) to a telephone wire ( 40 ) has a subscriber line interface circuit (SLIC 113 ) with a jack for connecting a telephone to the SLIC, a line...
6427011 Modem data access arrangement without diode bridge  
Computers commonly connect to remote computers and networks using the telephone lines. A telephone line is composed of a positive line (Ring) and a negative line (Tip). Because there is no...
Matches 1 - 50 out of 140 1 2 3 >