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7599484 Element management system for managing line-powered network elements  
A method of managing power at an element management system for a power sourcing network element and a power sinking network element of an access network is provided. The method includes identifying...
7583798 Apparatus for protecting multi-function products from surge voltage  
Provided is an apparatus for protecting a multi-function product from surge voltage, the multi-function product including a public telephone network connection unit which receives one of a ring...
7580160 Modem and facsimile apparatus capable of monitoring G3 communications via ISDN  
A facsimile use modem apparatus includes an analog interface formed from a silicon data access arrangement interfacing with an analog telephone line. A digital interface is provided to interface...
7573839 Line driver for an adaptive hybrid circuit  
A second output transmission signal (“TX 2 ”) added to a line driver is a scaled version of the main output transmission signal (“TX 1 ”). TX 2 is scaled from TX 1 by a variable scale...
7561683 Method for measuring resistance for a subscriber line interface circuit using a protective circuit  
The invention relates to a method for ascertaining a resistance value (Z) between a first contact ( 2 ) and a second contact ( 3 ) in a subscriber line interface circuit ( 4 ), where a protective...
7557676 Signal transmission circuit, electronic device, cable, and connector  
A signal transmission circuit has first to fourth inductors, and first and second varistors. The first and second inductors are magnetically coupled to each other. The first varistor is connected...
7515391 Linear low capacitance overvoltage protection circuit  
A bipolar semiconductor overvoltage protection circuit presents less capacitance to a communication line. The overvoltage protection circuit includes an overvoltage protection device that is biased...
7515672 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting  
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines....
7508930 Technique for independent ground fault detection of multiple twisted pair telephone lines connected to a common electrical power source  
A method and apparatus detects a ground fault on a span-powered telecommunication wireline within a plurality of span-powered wireline segments, to respective ones of which DSL-Cs are coupled, so...
7463675 Direct digital access arrangement circuitry and method for connecting to phone lines  
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a...
7433165 Auto-resetting span-power protection  
Systems and methods for auto-resetting span power protection are provided. In one embodiment, a method for deactivating a protective device is provided. The method comprises determining when an...
7412610 System and method for power delivery to computing terminals  
Described is a method wherein a computer terminal is coupled to a power supply through a docking arrangement. The docking arrangement includes a protection circuit. A current supplied to the...
7388962 Directional hearing enhancement systems  
A hearing enhancement system that enhances a user's hearing based on a directional speaker is disclosed. In one embodiment, the system can include an interface unit that has a directional speaker...
7340051 Power ramp-up in a line-powered network element system  
A method of ramping up a power supply that supplies power on a communication medium. The method includes supplying power on the communication medium with the power supply operating at a first set...
RE40020 Impedance blocking filter circuit  
An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally...
7280655 DSL protector having a detachable wire interface  
An embodiment of the invention is a digital subscriber line (DSL) protection device. The DSL protection device includes a housing and protection components with the housing providing at least one...
7266195 Surge clamp protection circuit  
A surge clamp circuit that may be implemented with DAA circuitry to limit the total voltage developed across one or more line side capacitors due to charge pumping phenomenon during a...
7231037 Active audio compressing in telecommunication  
An output reducing system for a telephone system, e.g., implemented in a headset, includes an input line and an output line, wherein the input line transmits an incoming signal to an output...
7224492 Facsimile apparatus capable of detecting a line connection  
A facsimile apparatus can properly detect whether or not the facsimile apparatus is connected to a line. The facsimile apparatus comprises a network control device formed of a semiconductor DAA...
7203224 Isolation system with digital communication across a capacitive barrier  
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a...
7158633 Method and apparatus for monitoring subscriber loop interface circuitry power dissipation  
Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a...
7154940 Isolation system with digital communication across a capacitive barrier  
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a...
7149286 Electrical system like a system for testing the channels of a communication system  
An electrical system is described comprising none or one or two function boards and at least one voltage converter. The function board/s and the voltage converter are connected such that a voltage...
RE39406 Telephone line coupler  
The telephone line coupler circuit has a single transmit opto-coupler whose output includes a DC bias component connected to a gate of a line seize switch for connecting a DC line seize load across...
7139104 Downsized facsimile machine using semiconductor DAA  
A facsimile machine having a semiconductor DAA provided in a line I/F part performing facsimile data communication with a network includes a tone signal reception part in the form of a...
7139391 DAA hook switch  
A hook switch circuit is shown wherein two high-voltage bipolar transistors, a PNP transistor Q 1 and a NPN transistor Q 2 . that are connected in a regenerative feedback manner to form a...
7139528 RF coupled data access arrangement circuit for telephony customer premise equipment  
A data access arrangement (DAA) circuit for an item of customer premise equipment (CPE, i.e., telephone terminal equipment) utilizes RF coupling across an isolation barrier between two sides of the...
7116779 Network interface device for high speed data lines  
A network interface device for Ethernet networks using unshielded twisted pair cables comprising an overvoltage protection module and an interconnection module connected to the overvoltage...
7099461 System and method for the powering and fault protection of remote telecommunications equipment  
A protection circuit for telecommunications equipment powered remotely through a twisted pair subscriber loop, comprising: a charge storage circuit, coupled to the subscriber loop through an arm...
7095848 Power up reset circuit for line powered circuit  
A system for powering up an electronic circuit with telephone line power such that the electronic circuit does not enter a lockup state. The system includes a voltage detector that measures the...
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...
7065056 Transceiver circuit including an echo canceller  
A circuit for transmitting and receiving communications. The circuit includes a transmit block, a receive block, and an echo canceller, coupled to the transmit block and to the receive block, for...
7058173 Multi-stage isolation barrier circuitry and method for connection of a telephony device to a telephone line  
A multi-stage surge protector/isolation barrier is provided for connection between a telephony device and a telephone network. The multi-stage surge protector/isolation barrier includes a first...
7031462 Electronic inductor with transmit signal telephone line driver  
In an electronic inductor circuit, an operational amplifier drives the base of the electronic inductor transistor, and receives negative feedback from the emitter of the transistor. The transistor...
7016490 Circuit board capacitor structure for forming a high voltage isolation barrier  
A circuit board capacitor structure operable as a high voltage isolation barrier in communication circuitry. Capacitor electrodes form a capacitive structure directly on a printed circuit board's...
6980647 Primary telephone line protector with failsafe  
Disclosed is a module ( 10 ) having pins ( 16-24 ) connected to respective conductor tower strips ( 46, 48, 50, 52 ). Pairs ( 46, 50 and 48, 52 ) of the conductor tower strips are spring biased...
6978013 Device for establishing a galvanically separate connection between a telephone line and a signal processing unit at the subscriber end of the telephone line  
A device for the DC-decoupled connection of a telephone line to a signal processing device at the subscriber end of the telephone line is disclosed. The device exhibits a first circuit which is...
6968055 DC holding circuit  
DC holding circuitry that may be implemented with other parts of a DAA circuit to terminate a telephone connections at the user's end. The DC holding circuitry may be implemented using a...
6961592 Battery protection circuit  
A protection circuit for a cellular telephone battery includes a first memory for storing battery identification data and a second memory associated with the telephone includes data relating to...
6959083 Loop current monitor circuitry and method for a communication system  
An audio signal processor which modifies audio signal components outside the conventional audio frequency band. The processor includes a Delta Sigma Modulator (DSM) that receives a non-interpolated...
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...
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...
6876742 High-voltage protection circuitry in a data access arrangement  
A data access arrangement (DAA) having improved surge protection. The DAA incorporates a high voltage clamping device functioning to protect line side circuitry from signal paths created by EMI...
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...
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...
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....
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...
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...
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...
6760437 Analog modem overcurrent protection  
An overcurrent protection circuit for an analog modem which uses passive-device features during normal operation to minimize modem signal noise and distortion, and active-device features when...
Matches 1 - 50 out of 345 1 2 3 4 5 6 7 >