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6930506 |
Terminating resistor driver for high speed data communication
A method and structure for a driver circuit having a plurality of parallel resistors, where a total impedance of all the resistors equals an impedance of an associated transmission line and a...
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4896352 |
Telephone set circuit including an overvoltage protection
In order to insure the protection of telephone set circuits when overvoltages generated from the telephone line occur, without impairing the operation of the set when hooking off the handset, the...
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4887293 |
Trunk circuit with loop length gain equalization
A key telephone system comprised of a key service unit connected to a plurality of local sets via four-wire conductors for providing full duplex signal communication between the key service unit...
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4431869 |
Telephone line feed
In a telephone line feeding arrangement, the line current is monitored by a multi-resistor network (R p R s ) and the output of the network applied to the inputs of an operational amplifier (A3)....
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4376876 |
DC Supply for an electronic signalling device
A DC supply for an electronic signalling device that is connected to a signal transmission line. The device comprises a plurality of circuit units each of which must be supplied with a DC-supply...
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4345117 |
Telephone line feed circuit
To limit the line current dissipation in a telephone system it is considered desirable, especially in electronic systems, for the line current feed to be constant current. In the present...
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4345115 |
Telephone line interface
A telephone subscriber's line interface for a system in which the telephone instrument and the connections therefrom to the exchange use analogue, while the exchange is digital is described, in...
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