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6965672 |
Electronic switching system
An electronic switching system, comprising a common source of voltage to a plurality of user stations connected in parallel, an electronic means of connection to electrically connect a chosen user...
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6959056 |
RFI canceller using narrowband and wideband noise estimators
In an adaptive filter for cancelling common-mode noise in digital subscriber loops, a narrowband noise estimator is used to detect one or more noisy frequency bands of the common mode signal and...
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6956945 |
Method and apparatus for phantom battery feed
A method and apparatus is for providing a phantom battery feed to reduce power consumption in a differential amplifier circuit. A voltage signal is driven onto a telecommunications line using a...
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6956943 |
Method and apparatus for minimizing the telephony ring voltage power supply requirements of an integrated services hub
The present invention discloses a method and apparatus for reducing the power required by an integrated services hub supporting a plurality of telephone circuits, comprising offsetting ringing of...
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6950512 |
Circuit arrangement for forming the termination of an analogous subscriber line
The invention relates to a circuit arrangement for forming the termination of an analogous subscriber line which comprises a first connection and a second connection for connecting a twin-wire...
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6947548 |
Driver circuit for subscriber terminals
Driver circuit for at least one subscriber terminal, comprising a first driver ( 14 ) for amplifying the power of a direct-voltage signal applied for supplying power to the subscriber terminal, the...
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6947547 |
Management system for a telecommunications switch
A management system for telecommunication switch is described. The management system is useful for providing operations, administration and maintenance (OAM) functions in a terabit switch. The...
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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...
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6937721 |
Broadband driver circuit
Broadband driver circuit for driving voice and data signals, having a current dividing circuit ( 37 ), which divides a current generated by a current source ( 38 ), in a manner dependent on a voice...
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6937720 |
xDSL class C-AB driver
A line driver having a non-linear amplifier that is arranged to provide a first output signal, which is an amplified input signal. The line driver also includes an analog linear amplifier providing...
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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.
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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...
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6925178 |
Returning ringing signals through the tip amplifier of subscriber-line interface circuitry
A subscriber-line interface circuit (SLIC) has tip and ring amplifiers connected to the tip and ring lines, respectively, of customer premises equipment (CPE). The SLIC returns the ringing signal...
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6925173 |
Optimization of a DSL-compatible POTS line card
A digital subscriber line (DSL) compatible plain old telephone service (POTS) line card that interface a telecommunications switching system to a subscriber over a two-wire subscriber line, wherein...
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6922469 |
Separation of ring detection functions across isolation barrier for minimum power
A communication system of the present invention utilizes ring detection circuitry on both sides of an isolation barrier. More particularly, the ring detection circuitry may include ring burst...
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6920217 |
Method and apparatus for transient suppression in an integrated POTS/DSL line card
Combined plain old telephone system (POTS) and digital subscriber loop (DSL) line card capable of suppressing low frequency transients. The line card includes the following elements. A DSL receive...
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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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6914981 |
Communication device
A communication device has a cut-off frequency switching unit for switching a cut-off frequency for communication data at a communication line, and a confirming unit for confirming whether or not a...
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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...
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6906997 |
Protection method and system for equipment in a network element
A protection method and system for equipment in a network element receives a protection request for an equipment item. A priority of the request and a priority of the equipment item is evaluated...
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6904133 |
Method and apparatus for coupling a voiceband modem circuit to a common phoneline connector
A method and apparatus for coupling a voiceband modem circuit to a common phoneline connector, the common phoneline connection having a ring line connection and a tip line connection which couples...
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6901059 |
Low noise hybrid circuit for communications systems using time division multiplexing
A modem for Time Division Multiplexed Digital Subscriber Line applications eliminates the requirements for a Hybrid Balanced Network and employs low noise termination of the load resistors using...
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6901142 |
Network termination of a telecommunications network
A network termination (NT) which is universally applicable and permits fair billing. The network termination (NT) according to the invention is characterized in that it comprises a switching...
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6898413 |
Method for seamless port capability for an alternative service provider
A method provides seamless porting of a user telephone number from a first telephone service provider network to a second telephone service provider network. A network interface device is provided...
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6898280 |
Line card and method for supporting pots, asymmetric DSL and symmetric DSL services
A line card and method is provided which supports symmetric and asymmetric telecommunication services, such as symmetric and asymmetric DSL services. The line card may support concomitantly POTS...
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6895089 |
Pots splitter with line impedance matching
Resistance in parallel with inductors in a series leg of the low-pass filter facilitates changing input and output resistance of the filter with little or no change in the reactance of the...
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6891935 |
Direct access arrangement (DAA) circuit having automatic interface identification
A technique is provided for an electrical device to automatically detect one of a plurality of interface standards to operate in accordance with. More particularly, a direct access arrangement...
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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...
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6885745 |
Voltage and protection arrangement for a telephone subscriber line interface circuit
A protection arrangement for a telephone subscriber line interface circuit is disclosed. The arrangement is particularly useful for protecting an electronic telephone set from over-voltage and...
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6879686 |
Line take-up detection circuit
An interface circuit including a galvanic isolation barrier between a transmission line and a user equipment, and a detector for detecting, independently from a transmission, the idle or busy state...
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6873702 |
Telephone subscriber system
A subscriber's telephone system is presented that includes at least one driver circuit connected to Tip and Ring terminals. An additional network is connected between an output of the driver...
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6873703 |
Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response
A transmission channel for a subscriber line interface circuit comprises a front end, tip/ring current-sensing transimpedance stage, containing relatively low valued tip and ring sense resistors...
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6870928 |
Line interface, apparatus and method for coupling transceiver and transmission line
A line interface couples signals between a data transceiver and a transmission line having a load impedance Z. The line interface includes a transformer, a driver circuit for supplying a transmit...
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6865269 |
Method and apparatus for switch hook detection
A method and apparatus is provided. The method includes receiving a signal over a connection from a telephonic device, determining if the signal is greater than a first preselected value, and...
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6862352 |
Controlled switching mechanism for accomplishing soft polarity reversal, ring-trip filtering, and line voltage measurements in a subscriber line interface circuit using common capacitor
A controllably switched arrangement selectively couples multiple circuit functions, such as reverse polarity detection, ring-trip and line voltage measurement, of a telecommunication card to the...
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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...
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6853723 |
High impedance polarity detector
A method and apparatus for measuring signals conveyed by a varying polarity voltage signal across a tip and ring in a telephone system is disclosed. A voltage present across the tip and ring is...
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6850618 |
Central office interface techniques for digital subscriber lines
A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a...
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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...
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6845248 |
Broadband wireless shared resource network architecture
A DSL access multiplexer exchanges communications between DSL connections and premise connections. A premise wireless interface exchanges the communications between the premise connections and a...
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6845156 |
System for reducing distortion in a line powered modulator
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 and a sense resistor. A shunt regulator is...
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6845157 |
Linear polarity guard and method for DSL-ready pots devices
A plain old telephone system (POTS) device, for example but not limited to, a telephone, facsimile machine, analog modem, caller identification (ID) system, speaker phone, cordless phone, etc.,...
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6842518 |
Frequency-dependent impedance synthesis for DSL interface circuits
An impedance warping circuit (IWC) and technique for compensating the effect of a blocking capacitor within a transformer of an interface circuit for passing plain old telephone service (POTS) band...
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6842519 |
Communication with current detection
Apparatuses and methods are disclosed for communications using current detection. According to one embodiment, a transmitter generates a signal on a transmission line by switching between two power...
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6839425 |
Integrated analog/digital telephone network interface circuit design
A remote terminal for use at an access network node of a network provides a plurality of telecommunications services, the remote terminal providing selected ones of the telecommunications services...
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6836546 |
Apparatus and method of coupling home network signals between an analog phone line and a digital bus
An arrangement for implementing a network in an ISDN-based customer premises having a four-wire ISDN S0 bus. The ISDN-based customer premises includes a Network Termination Basic Access (NTBA) that...
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6836509 |
Dsl- compatible pots line card
An improved plain old telephone service (POTS) line card that may be directly connected to a customer line that is also connected to a digital subscriber line access module. A second order filter...
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6831975 |
Digital subscriber line (DSL) modem compatible with home networks
A cost-effective filter consuming low power and occupying minimal space. The filter may be used in a ADSL modem (or CPE) to filter the signal components other than the ADSL signals. A high pass...
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6829354 |
Biasing arrangement for optimizing DC feed characteristics for subscriber line interface circuit
A subscriber line interface circuit (SLIC) drive arrangement controllably adjusts DC biasing and overhead voltage characteristics for wireline pair that is optimized for each mode of operation of...
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6825686 |
Line interface circuit, associated line drivers and methods of operating the same
A line driver is disclosed comprising a termination portion which includes a termination resistance (R term ) and which is supplied in use by an operational amplifier (op-amp), with a termination...
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