Matches 351 - 400 out of 527 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6272219 Access network with an integrated splitter  
The present invention provides an effective way for Telecom operators to provide ADSL service to customers who are receiving POTS service over a pair gain system or who are connected to ISDN....
6272220 Electronically switched optically coupled line interface  
An optocoupled line circuit is arranged with a diode bridge providing uniform direction current flow so as to eliminate the mechanical switch hook contact of the prior art. A zener diode is used to...
6263076 Arrangement in a subscriber line interface circuit  
A control processor is connected to a subscriber line interface circuit to control the operating mode of the line interface circuit and monitor, via a detector output terminal of the line interface...
6263075 Interrupt mechanism using TDM serial interface  
An improvement to split-architecture audio codecs such as those defined by the Audio Codec '97 specification (AC '97) includes an interrupt mechanism which allows an event at an analog peripheral...
6249580 Upgradable customer bridge  
A bridge for use in a junction box wherein the junction box receives a first wire pair coupled to a central office and at least two device wire pairs coupled to a local telephone device. The bridge...
6246748 Power feeding system using two-wire subscriber lines  
A power feeding system includes a line state detector for detecting an operation state of each of a pair of 2-wire subscriber lines connected to the exchange equipment and a transformer for...
6233335 Battery switching subscriber loop interface circuit  
A subscriber loop interface circuit is provided that includes a current directing element for directing current from the output stage of line interface amplifiers. The current is directed to a...
6222853 Communication system for a line network  
A method is specified for operating a communication and/or control system via a line network equipped with socket outlets, in which for the supply of a standardized supply voltage at least one...
6219417 Ring trip detection in a communication system  
A line card integrates subscriber line interface circuitry, A/D and D/A converters, and digital signal processing technology. The digital signal processing technology performs many line card tasks...
6212272 Subscriber line interface circuit (SLIC) simulator  
An analog subscriber unit adapter/interface which generates a low voltage ring-tone signal to an audio speaker is provided The adapter facilitates the use of an analog subscriber unit over an ISDN...
6203334 Modular jack receptacle including a removable interface  
A modular jack receptacle that includes a plurality of removable interfaces that provide for interconnection between and among the plurality of interfaces and a modular jack held by the receptacle....
6198818 Method and apparatus for controlling the input impedance of an analog front end circuit of a data communications equipment (DCE) device  
The present invention provides a method and apparatus for use with an analog front end circuit of a DCE of a multipoint system for preventing an impedance null from being generated in the frequency...
6192125 Optical coupling circuit for a data access arrangement (DAA)  
There is disclosed a system and method of providing electrical isolation between a telephone line and a connected device, such as a computer. In one embodiment the telephone line is 2-wire and the...
6169792 Method and apparatus for implementing automatic number identification system for DAA  
The present invention provides apparatus and method for automatic number identification (ANI) for a data access arrangement (DAA) of a modem. Modems or telephones equipped with an ANI system use...
6169801 Digital isolation apparatus and method  
A digital isolation apparatus for coupling between a telecommunication network and a digital signal processing device. A CODEC is arranged to couple to the telecommunication network, convert a...
6167132 Analog successive approximation (SAR) analog-to-digital converter (ADC)  
An analog successive approximation (SAR) analog-to-digital converter (ADC) is disclosed that is a compromise between a SAR ADC implementation and a fully parallel thermometer-to-binary ADC. The...
6160885 Caller ID circuit powered through hookswitch devices  
The communication system disclosed herein allows for the hookswitch devices to draw loop current from the phone line in both on-hook and off-hook conditions. Thus, even though an on-hook condition...
6144733 Ring filter for pots communication system  
An line interface circuit at a central office of a telecommunication system provides improved noise immunity to a ring signal. In accordance with one aspect of the invention, the line interface...
6144735 Filters for a digital subscriber line system for voice communication over a telephone line  
A dual-mode filter network for an Asymmetric Digital Subscriber Line (ADSL) has a first frequency response when the Plain Old Telephone Service (POTS) telephone is on-hook and has a second...
6141414 Data access arrangement having combined remote hang-up/ring detection circuitry  
A data access arrangement (DAA) for interfacing a modem with a telephone line which requires only one safety barrier device for providing electrical isolation of the modem from the telephone line...
6137880 Passive splitter filter for digital subscriber line voice communication for complex impedance terminations  
A dual-mode filter network for an Asymmetric Digital Subscriber Line (ADSL) has a first frequency response when the Plain Old Telephone Service (POTS) telephone is on-hook and has a second...
6134321 Modem loop current detect system to detect an off-hook condition in an extension telephone  
A telephone line monitoring circuit uses an optoisolator to convert the telephone line current to a voltage which is applied to the input of an AID converter. The A/D values are coarse values...
6134323 Telecommunications system, an automatic branch exchange, a line card, a supply circuit for a telecommunications line, and a telecommunications subscriber device  
A telecommunication system has a supply circuit to supply power to a telecommunication line. The telecommunication line is connected to a telecommunications subscriber device. The supply circuit...
6129590 Network interface device retrofit kit  
A network interface device is attachable to an intermediate field of a building entrance protector unit. The network interface device includes a jack section having a jack which is designed to...
6119090 Subscriber line interface circuit which automatically adjusts the signal headroom on a telephone line and a method of doing the same  
In a subscriber line interface circuit connected to a two-wire telephone line (A and B lines) for transmitting AC signals, one of the wires (e.g., the A line) is set to a DC voltage lower (i.e.,...
6115466 Subscriber line system having a dual-mode filter for voice communications over a telephone line  
A dual-mode filter network for an Asymmetric Digital Subscriber Line (ADSL) has a first frequency response when the Plain Old Telephone Service (POTS) telephone is on-hook and has a second...
6084961 Circuit for monitoring battery voltages of telephone terminal facility, using power detector temporarily activated by ringing or off-hook signal  
A circuit for monitoring battery voltages of a telephone terminal facility is disclosed. This circuit mainly includes a ringing detection circuit for generating a pulse signal in response to an...
6075856 Subscriber circuit  
A subscriber circuit has several SLIC circuits (2, 3, 4, 5) combined in one multiple SLIC. The high-energy components of each SLIC circuit (2, 3, 4, 5) are realized as individual components (30,...
6067316 Circuit for combined xDSL and other services  
A system and method for a communication to communicate both POTS and XDSL are provided. In accordance with one aspect of the invention, in improved central office line card circuit is provided,...
6052459 Method and arrangement for signalling systems  
The invention concerns a method and an arrangement for selecting a signalling system. The inventive method comprises the steps of storing an information about various parameters of alternative...
6049605 Telephone line access arrangement  
A telephone line access arrangement for a telephone instrument and a modem gives priority to the telephone instrument in all instances. A microprocessor controls the modem and receives an input...
6047063 Methods and apparatus for providing an auxiliary communication line  
Methods and apparatus for using and/or switching to an auxiliary communication pathway to increase system reliability and/or reduce maintenance costs is disclosed. One feature is directed to a...
6021120 System and method for creating full duplex virtual circuits based on multiple asymmetrical links  
A system and method for creating full duplex symmetrical circuits using asymmetrical links. Two asymmetrical channels 101a, 101b having high speeds in reverse directions are linked together in one...
6018529 Channel bank with individually removable processorless U-BRITE cards controlled by bank controller card  
A reduced cost and hardware complexity ISDN channel bank architecture supports a plurality of Basic Rate-One Transmission Extension (BRITE) ISDN circuit cards. Rather than install a dedicated...
6005934 Simulating changes in telephone subscriber line  
A fixed wireless access subscriber unit containing a wireless transceiver and a telephone subscriber line interface circuit which supports privacy and remote release of hold between the subscriber...
5982878 Combined loop current sink, battery detector, and ringing detector circuit  
A combined loop current sink, battery detector, and ringing detector circuit as used in a channel unit at a telephone central office connection to a digital loop carrier circuit, to provide...
5971795 Multiple level network interface device  
A network interface device has a base. The base has a first jack on its bottom and a second jack on its top. A middle section is pivotally attached to the base. The middle section has a plug...
5960076 Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value  
To determine the deviation of longitudinal signal components from a predetermined value on a balanced two-wire circuit (A,B), a first voltage is measured between one of the wires (A) and a first...
5946394 Isolation amplifier with hook switch control  
An isolation amplifier circuit with hook switch control includes first and second amplifier stages optically isolated from and coupled to each other. A biasing circuit is optically coupled to the...
5946393 Data access arrangement  
A data access arrangement generates a first current in a first current path which runs from a tip terminal of a line pair through a light emitting diode of an opto-isolator to a sense node. The...
5943419 Subscriber circuit with built-in polarity switching circuit  
The subscriber circuit has a balanced amplifier and a built-in call-current polarity changing circuit. Moreover, the output stage circuits of the direct feed-back and offset cancel circuits of the...
5943420 Power-up system for line-powered telephones  
A speaker-phone telephone, in which a speaker-microphone unit is powered by wall current, and a separate telephone is separately powered, by telephone line current. The speaker-microphone unit...
5940500 Series equipment with DC line hold transfer  
A telephone series equipment line circuit for connection between a central office (CO) line and a terminal equipment (TE) line comprising a filter connected between the lines for blocking message...
5937030 Off-hook signal and dial pulse generating circuit and a method for driving the same circuit  
An off-hook signal and dial pulse generating circuit which has a smaller number of switching devices having a high withstand current characteristic and has a less surge voltage than up to now. A...
5930349 Command signals generator circuit for telephonic fees indicators  
The present invention relates to a control signal generation circuit for telephone charge indicators comprising a capacitor having a first and a second terminals connected to ground through...
5903372 Means for remote addition of video services to subscribers  
The present invention details an apparatus for distribution of video and telephony services on a single twisted wire pair to each of a plurality of subscribers, comprising an optical network unit...
5901220 Network interface device  
The present invention is related to a network interface device 10 and a network interface module 50 for mounting therein. The network interface device 10 features two covers 12, 32. The first cover...
5881129 Self-monitoring line interface circuit  
A line circuit whose circuit components are selectively controllable by a microprocessor/DSP to provide normal BORSCHT functions or to be selectively tested without need for an electromechanical...
5872842 Unbalanced ringing using a balanced ringing generator of a subscriber line interface circuit  
A communication loop using a subscriber line interface circuit (SLIC) is modified such that it can operate in unbalanced ringing environments as well as balanced ringing environments. This is...
5867575 Optimized interface between audio/modem board and sound board  
An add-on card and connector including telephone functions is provided. The telephone functions are ones which are unlikely to be eventually performed on a mother board. A connection is provided...
Matches 351 - 400 out of 527 < 1 2 3 4 5 6 7 8 9 10 11 >