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RE40897 |
Constant current line circuit with class features
A line circuit utilizing a differential amplifier whose output is regulated to zero volts D.C. (when the subscriber's set is off-hook) by a negative feedback circuit, for controlling a voltage...
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7471931 |
System and method for controlling transceivers based on a location indicator
A system for controlling transceivers based on a location of the transceivers, as indicated by a location indicator, helps to reduce crosstalk interference in signals transmitted from central...
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7366470 |
Inter-modulation distortion compensation
An Inter-modulation distortion measurement and correction method which could be applied over a communication channel that is a combination of either or both analog and digital channels. This method...
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7164763 |
Power offloading for a subscriber line interface circuit
A power offload network has a node for receiving at least one supply V 1 . The power offload network includes at least one switch and a power offload element providing a supply drop of VR. The...
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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...
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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...
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7068781 |
Alarm of a telecommunications terminal connected to a LAN
Before any supply of remote power to a telecommunications terminal connected to a local area network, the Ethernet equipment must recognize the power class of the terminal by measuring a specific...
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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...
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6980648 |
Telephone system with current regulation in the constant current region
A telephone system includes a transmission line for connection to at least one telephone and a telephone interface in communication with the transmission line. The telephone interface provides DC...
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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...
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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...
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6904145 |
ADSL front-end in a low voltage process that accommodates large line voltages
The asymmetric digital subscriber line receive channel includes: first and second external resistors 20 and 22 coupled to a telephone line 24 and 26 ; a coarse programmable gain amplifier...
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6865271 |
Constant current line circuit with class features
A line circuit utilizing a differential amplifier whose output is regulated to zero volts D.C. (when the subscriber's set is off-hook) by a negative feedback circuit, for controlling a voltage...
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6856685 |
Feed arrangement for a subscriber loop with multi-level current regulation capability
A feed arrangement for a telephone subscriber loop. The feed arrangement includes an input for connection to a power supply and an output for connection to the TIP and RING conductors of the...
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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....
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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...
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6718019 |
Method and apparatus for wireline characterization
The current invention provides a method and apparatus for wireline characterization is disclosed. The method may be implemented with any modulation protocol but is particularly suited for...
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6704414 |
Telephone line extension
A system comprising a base unit and a remote unit for transmitting telephonic data on AC power lines is disclosed. The base unit includes a transmitter section, a receiver section, a power line...
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6633770 |
Telecommunication device holster having a retractable earpiece assembly integrated with the holster
A holster ( 10 ) for a telecommunication device ( 12 ), such as a cellular telephone or wireless telephone, includes a housing ( 14 ) adapted to removably support the telecommunication device ( 12...
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6453043 |
Flash-cut of speech processing features in a telephone call
A speech processor uses at least two speech processing features to enhance the quality of speech signals received by a user during a telephone call. The speech processing features are applied to...
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6301358 |
Dual-slope current battery-feed circuit
A dual-supply line-interface circuit (100) uses a -48V power supply (V BAT1 ) to drive long subscriber loops (120) and uses a -28V power supply (V BAT2 ) to drive short subscriber loops. For...
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6289099 |
Ringer for satellite user terminals
An apparatus, system, method, and computer program product for providing a flexible ringer for multiple deskset phones. A controller detects a flag message that precedes an incoming telephone call,...
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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...
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6218930 |
Apparatus and method for remotely powering access equipment over a 10/100 switched ethernet network
Apparatus for remotely powering access equipment over a 10/100 switched Ethernet network comprises an Ethernet switch card with a phantom power supply for remote access equipment and added...
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6195429 |
Arrangement in a subscriber line interface circuit
In a subscriber line interface circuit connected to a telephone line having a high potential wire and a low potential wire, an arrangement for generating a signal for determining the line voltage...
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6125179 |
Echo control device with quick response to sudden echo-path change
An Acoustic Echo Control (AEC) device operates to reduce acoustic echo feedback in a speakerphone. An adaptive echo canceller responds to a far-end speech signal to generate an estimated echo which...
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5896449 |
Voice enhancement system and method
A system (130) for providing enhancement to a voice-band signal in a telecommunications network (138) is provided. The present system (130) includes a power averager (18) for determining the...
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5889854 |
Technique for compensating for signal attenuation on a telephone line
An apparatus compensates for an attenuation of a signal on a telephone line in a communication system connected to the telephone line via a transformer. A photo coupler detects a loop current at a...
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5862213 |
Circuit arrangement for generating charge pulses
A circuit arrangement for generating charge pulses during digital telecommunications is indicated, whereby subscribers (Tln) of a telephone network are connected by cables with an exchange. The...
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5828748 |
Method for customizing operation of a line interface circuit in a telecommunications network
A method for reducing frequency-related power losses in a telecommunication line interface circuit comprises operating a switching converter circuit at an optimum frequency. Determination of the...
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5818926 |
Switching device for telecommunications channel
A switching device for a telecommunications channel. The device comprises a voltage detector, a switch, and a storage device. The voltage detector produces an output voltage if the voltage between...
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5802164 |
Systems and methods for controlling telephone sound enhancement on a per call basis
In a communications system containing signal enhancement circuitry capable of selectively enhancing portions of a plurality of signals carried on a corresponding plurality of channels through the...
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5708703 |
Wide range equalizer with line length detection
An automatic line equalizer for use with a T1 or an E1 repeater in a telecommunications system is disclosed. The equalizer includes a first equalizing means for equalizing an input line having a...
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5689551 |
Caller ID system with prescaler
A caller ID system is disclosed in which a prescaler is coupled between a source of a caller ID signal and a caller ID receiver, and a processor is coupled to the caller ID receiver. The prescaler...
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5623543 |
Two port signalling voltages filter arrangement
A twisted-pair telephone line is connected to a conventional telephone via a low-pass filter and equipment for receiving signals in an upper frequency range, e.g., 25-1000 kHz via a high-pass...
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5600718 |
Apparatus and method for adaptively precompensating for loudspeaker distortions
In an audio system, a loudspeaker responds to an input signal producing a sound pressure wave having a linear component, which is linear function of the input signal, and an undesired non-linear...
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5577117 |
Methods and apparatus for estimating and adjusting the frequency response of telecommunications channels
In methods and apparatus for estimating the frequency response of telecommunications channels, signals carried on the channels are divided into pluralities of signal segments of limited duration,...
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5535273 |
Circuitry for superimposing small, low energy signals and large, essentially higher energy signals
A circuitry is disclosed for superimposing small, low energy (2) and large substantially higher energy (3) signals, in particular for transmitting speech signals with a remote supply direct signal...
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5473685 |
Telecommunications end station with electrically controlled terminating impedance
The terminating impedance can be set electrically to eliminate selection and installation of discrete components in order to meet network manager specifications. A control device such as an EEPROM...
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5461671 |
Telephone line power utility circuit
A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current...
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5455843 |
Adaptive equalizing apparatus and method for token ring transmission systems using unshielded twisted pair cables
Adaptive analog equalizer permitting 16 Mbit/s token ring (TR) transmission over unshielded twisted-pair (UTP) cables. The equalizer (29) is located at the wiring concentrator (25), and consists of...
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5436968 |
Digital data-dependent ac impedance termination of telephone line
The potential impedance mismatch of digital terminal equipment and a line test unit that has been equipped to conform with the Bellcore standard of terminating the line with a 600-900 ohm impedance...
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5426697 |
Duplex communication coupler system
The single transformer generally used in a duplex coupler for coupling local telecommunication equipment, such as a modem, to a telephone line may be replaced by a number of transformers or other...
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5426698 |
Transformed current sensing relay for use in switched network modems and circuit incorporating same
A transformed current sensing relay with reduced AC impedance of the operating coil is accomplished by adding a shorted secondary winding to an otherwise conventional current sensing reed relay....
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5396553 |
Automatic loss control circuit
Disclosed is a circuit for providing an appropriate amount of on-hook loss in a digital loop carder transmission system serving telephone customers. The resistance of the customer loop is measured...
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5367447 |
Signal separation circuit
A signal separation circuit for separating direct current power on a telephone with a transistor. A CPU, which includes an A/D converter, is connected to detect the emitter-collector voltage of the...
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5361300 |
Balancing resistor and thermistor network for telephone circuits, and combination thereof with relay
A balancing resistor and thermistor network for telephone circuits, and combination with an external relay, which reliably handles all three levels of adverse conditions, automatically resets under...
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5359655 |
Supply circuit for a telecommunication line, providing highly symmetrical and rapid response to line voltage disturbances
A supply circuit for a two-wire telecommunication line includes a voltage adjusting circuit section coupled between one of the wires and a first reference potential point and further includes a...
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5349640 |
Option bus adapter
A method and apparatus for connecting a programmable computing device to a digital telephone via an adapter. The digital telephone includes an option bay connection, having a hierarchical control...
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5347544 |
Gain or loss compensation circuit for telephone lines
A compensation circuit for adjusting the gain or loss of a four to two wire hybrid circuit in a telephone system automatically, regardless of the length of the telephone line interconnected to the...
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