Matches 201 - 250 out of 525 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
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....
6819761 Programmable constant current “off hook” circuit  
An apparatus and method for interfacing a communication device, such as a Customer Premise Equipment (CPE) to different telephone networks. The telephone networks typically provide a voltage of 48...
6813340 Ringing SLIC fault handling  
A line card or other telephone or communications interface provided with a ringing SLIC outputs relatively high voltage, such as in excess of about 90 volts, and/or relatively high current such as...
6810121 Common package  
A common package serves as, for example, a common network interface package for a switching system. Since the common package is usable for various purposes, its cost is reduced and the cost of...
6804348 Circuit for echo-cancellation in an asymmetric, two-way time-and frequency-shared communication medium  
A hybrid circuit models a plurality of attributes of a communication system including a subscriber line coupled to a line interface circuit. The plurality of attributes includes subscriber line...
6795548 Method and system for data communication  
A system for data communication is disclosed that comprises a hybrid circuit ( 220 ) that receives a signal. A switched gain circuit ( 204 ) coupled to the hybrid circuit ( 220 ) receives the...
6795552 Enhanced services network interface device  
A network interface device includes an enclosure that houses active electronics for accommodating twisted-pair telephone wires and coaxial cable. The housing has a base that connects to a building...
6788784 Circuit arrangement for signaling in telecommunications networks  
A circuit arrangement for signaling in telecommunications networks has a first connection and a second connection for a first and a second conductor, respectively, in a transmission line. The first...
6785383 Telephone line switch using an optocooupler  
A telephone line connection and disconnection circuit has a diode bridge coupled to the telephone line which converts different voltages of the telephone line into a voltage referenced to ground. A...
6782096 Subscriber line driver and termination  
A subscriber line driver (SLD) is provided for the continuous and automatic transformation of the characteristics of a communication system signal so that the signal conforms to a power spectral...
6782098 Protection circuit/method for subscriber telephone interface circuit  
The present invention provides an improved method of protecting a subscriber telephone interface circuit from the application of excess voltages and currents. The method uses a standard subscriber...
6782097 Splitter device for MDU/MTU environments  
A front access splitter assembly that fully supports lifeline POTS and lifeline ISDN (Integrated Services Digital Network) service requirements is shown and described in this disclosure.
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...
6778549 Coupling device connecting multiple pots lines in an HPNA environment  
A local area data network includes two separate and unique twisted pair telephone networks joined by a coupler to form a common data network. The coupler operates to pass pulse position modulated...
6778646 System and method for coupling multiple home networks  
A system and method for coupling multiple home networks includes a first copper wire network, a second copper wire network, and a high pass coupler disposed between the first and second copper wire...
6778663 Method and apparatus for sensing current  
A method and apparatus are provided for sensing current in a subscriber line. The method includes receiving a current signal from a driver capable of driving the current signal on the subscriber...
6778664 Line current protection circuit and method for linear and nonlinear hold circuit  
A novel line-current protection circuit for detecting excessive line current from a telephone line and protecting line interface circuitry from the excessive line current is presented. The...
6771775 Arrangement for communicating messages via a low-voltage electricity supply system and adapter  
A PC ( 10 ) connected to a low-voltage electricity supply system ( 9 ) via a mains plug ( 11 ) and a mains socket outlet ( 12 ), into which the said plug is plugged, exchanges messages with other...
6771774 Filter arrangement for shaping a pulse propagated over POTS wiring, and a method of manufacturing the same  
A filter arrangement, for shaping a signal transmitted over POTS wiring, includes an input to receive a signal. The filter arrangement includes a signal path from the input to an output that is...
6768777 Method and apparatus for calculating the number of very high speed digital subscriber line nodes  
A method is provided for estimating a number of digital subscriber line nodes ( 220, 230 ) required to supply, from a line supply source ( 200 ), a geographically distributed network of...
6763107 Method and apparatus for reducing distortion in a line powered modulator circuit  
A method and apparatus for a telephone line interface or data access arrangement (DAA) which includes a shunt regulator in series with a line modulator. A sense resistor is placed in series between...
6763109 Copper based interface system and regulated power source  
Method and apparatus for providing a regulated and current limited power source to support bidirectional telephone delivery circuitry and methods for a multiplicity of telephone subscriber lines to...
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...
6757382 Quasi ground fault interruption signal-based activation of emergency pots by-pass paths for line-powered digital subscriber loop  
A ‘lifeline’ POTS back-up mechanism is operative to provide emergency plain old telephone service connectivity over a span-powered two-wire metallic digital subscriber loop pair, in response to...
6757381 Design of telephone line interface circuits using a two chip opto-coupler with LEDs integrated onto silicon chips  
Design techniques are describes in which a telephone interface circuit or DAA can be realized using two silicon integrated circuits which include integrated opto couplers. The LED is formed on the...
6754339 Message transmission system  
A message transmission system having at least one subscriber's terminal device that is connected by way of a subscriber's line that is comprised of a first and second lead, with a subscriber's...
6754338 Bidirectional loss/slope equalizer arrangement  
A bidirectional equalizer arrangement for cancelling the effect of residual capacitance and/or residual resistive loss in a separation filter having a low-pass filter and a high-pass filter. The...
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...
6748078 System and method for allocating overhead voltage in the transmission of pots and XDSL signals  
A communication system and method for allocating overhead voltage between a telephonic switch and a user device is described. A line driver is located in the telephonic switch and is coupled to the...
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...
6744883 Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel  
A filter system (and associated filtering method) is disclosed, the filter system being connected between a large-amplitude, high-frequency noise source and a frequency-division multiplexed...
6741702 Device for connecting a subscriber line to a high frequency link and to a low frequency link  
The invention relates to device for connecting a subscriber line SUB to a high frequency link HF and to a low frequency link BF, the device comprising a transformer TR disposed between said...
6735293 Method and system for facilitating telecommunications service provisioning and service assurance  
An automated system coordinates, controls and polices installation of customer premise equipment (CPE) for telecommunications services and provides continuing service assurance. The system verifies...
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...
6731750 xDSL multiple-point interface device  
Multipoint interface devices (MPID) for digital subscriber line environments are provided. In one embodiment an MPID is provided for each item of customer premises equipment that is connected to...
6728368 Apparatus and method for a highly efficient low power driver for a central office ADSL system  
An apparatus and method to implement a highly efficient low power line driver. In a first embodiment, the invention provides a method to increase the power efficiency of a line driver. The method...
6728371 Method and apparatus for stabilization of a line powered modulator circuit  
A method and apparatus for a data access arrangement (DAA) which includes a line modulator containing capacitive elements to increase system stability. The invention provides improved stability...
6728347 Network station  
The invention relates to a network station ( 1 ) comprising a selector switch ( 4 ) for coupling a switching center ( 2 ) to a POTS or ISDN telephone, and a detection circuit ( 3 ). After the...
6724889 Method and system for line status indicators using line side power  
A power management circuit for use in a terminal interface device such as a modem which converts available line side power into usable power for use by the terminal interface device to activate a...
6724891 Integrated modem and line-isolation circuitry and associated method powering caller ID circuitry with power provided across an isolation barrier  
An improved modem architecture and associated method are disclosed that integrate modem and line-isolation circuitry so as to achieve modem functionality and system-side isolation functionality on...
6718020 Switchable POTS splitter  
Switchable POTS-splitter for separating a voice signal from a data signal having a high pass filter for the data signal and a low pass filter for the voice signal and for a ringing signal which is...
6714647 Network interface unit with subscriber line daughter boards  
The present invention provides an improved communications interface device for existing interface devices, capable of providing improved and enhanced functional features to the traditional limited...
6714645 Telephone line interface circuit without hookswitch relay  
A telephone line interface circuit which does not require a hookswitch relay is disclosed. An optoisolator is utilized to place a telephone line interface circuit on-hook and off-hook. In one...
6707913 Network interface  
A telephone network interface device that provides at least two drop-wire connection ports and two distribution cable ports. One drop wire port provides full bandwidth service with the second port...
6700975 Subscriber line interface circuit  
In a subscriber line interface circuit, a device applies to a line, associated with the line interface circuit, a substantially constant line current of a first predetermined value for line...
6700974 Switching power supply for generating a ringing voltage  
An apparatus and method for providing a ringing voltage to a communication device such as a telephone or a modem. Typically, communication devices are coupled to a ringing voltage providing...
6694015 Universal line interface in telecommunications system  
A universal line card architecture includes core circuitry for performing battery, overvoltage, ringing, supervision, coder/decoder circuit (CODEC), hybrid and test (BORSCHT) functions...
6694016 Odd-order low-pass POTS device microfilter  
An odd-order low-pass microfilter is disclosed for being interposed between a home telephone wiring network and a POTS, or voice band, device to separate voice-band signals from higher frequency...
6694013 Filter arrangement and method for telecommunication device  
The present invention relates to a filter arrangement ( 8 C) and a method for frequency filtering and impedance conversion. The invention makes it possible to perform frequency filtering and...
Matches 201 - 250 out of 525 < 1 2 3 4 5 6 7 8 9 10 11 >