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8150028 |
Circuit device with serial bus isolation
In a particular embodiment, a circuit device includes a first circuit having a first plurality of serial terminals including a first data receive terminal and a first data transmit terminal. The...
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8129974 |
Systems and methods for self-recycling power
A power system includes a switch, a capacitor and a comparator circuit. The power system receives a signal to turn off power supplied to the power system, turns off the switch that is used to...
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8131285 |
Transmission/reception channel matching apparatus for mobile communication terminal and mobile phone test equipment
Disclosed herein is a transmission/reception channel matching apparatus for a mobile communication terminal and a mobile phone test equipment. The transmission/reception channel matching apparatus...
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8049484 |
Controlling inline power at a powered device
A powered device includes a first switch, a second switch, and a controller. The first switch is disposed between a center tap of the first transformer and a center tap of the third transformer....
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8023642 |
Method for extending ethernet over twisted pair conductors and to the telephone network and plug-in apparatus for same employing standard mechanics
An Ethernet extension device is provided for metro or last mile Ethernet service via twisted pairs as opposed to fiber optics. The Ethernet extension device is implemented as a plug-in extension...
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8005205 |
Protective plug for distribution frame devices in telecommunications and data technology
The invention relates to a protected plug socket (20) for distribution devices in telecommunications and data technology, comprising at least one housing (21) and at least one protective element...
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RE42590 |
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...
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7964993 |
Network devices with solid state transformer and class AB output stage for active EMI suppression and termination of open-drain transmit drivers of a physical device
Embodiments disclosed herein describe a network device including a class AB common mode suppression (CMS) circuit coupled in parallel between a line voltage source and a physical layer (PHY) device...
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7940922 |
Telephone interface circuit
A telephone interface circuit comprising a speech circuit, a control circuit turning on upon receiving a supply of a forward direction trigger current so as to connect first and second telephone...
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7912210 |
Inductive coupling for communications equipment interface circuitry
A system for improving the attenuation of an undesired signal found in a differential signal path through the use of inductive coupling. The system includes a primary inductor, a secondary...
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RE42093 |
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...
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7881461 |
Method and apparatus for conveying bidirectional data, power and timing signals using a single transformer
Transformer driven by data modulated signal provides isolated power. Outbound data is extracted from the data modulated signal received from the transformer. Inbound data received in isolated...
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7822195 |
Telephone interface circuit
A telephone interface circuit comprises a first transistor for controlling opening and closing between a speech circuit and subscriber lines, a second transistor for controlling the first...
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7787614 |
Sealing current terminator for inhibiting oxidation and methods therefor
Methodologies and structure are provided for use in a communications line that transmit data without plain old telephone service (POTS), or splits the POTS service from the data service, to inhibit...
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7773744 |
System and method for terminating sealing current
A sealing current system for a subscriber line that comprises a power source coupled to a first end of the subscriber line configured to apply a voltage to the subscriber line. The sealing current...
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RE41164 |
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...
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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...
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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...
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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...
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7573839 |
Line driver for an adaptive hybrid circuit
A second output transmission signal (“TX2”) added to a line driver is a scaled version of the main output transmission signal (“TX1”). TX2 is scaled from TX1 by a variable scale factor K. An adap...
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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 circuit...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7139391 |
DAA hook switch
A hook switch circuit is shown wherein two high-voltage bipolar transistors, a PNP transistor Q1 and a NPN transistor Q2. that are connected in a regenerative feedback manner to form a bi-stable...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 toward each...
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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...
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