Telephone line interface

Details Telephone line interface Telephone line interface

1997-12-10

1999-09-14

Eisenzopf, Reinhard J.

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

379399, H04M 100

Patent

active

059534095

ABSTRACT:
An interface unit for providing impedance matching with the impedance Z.sub.line between two transmission line terminals and a transmitter/receiver unit connected thereto comprises a current generator for generating an AC current running into the transmission line, a device for sensing the voltage across the two terminals of the transmission line, and a control device receiving a value of the sensed voltage and controlling the current generator in response thereto, so that said current generator supplies an AC current which, together with the voltage across the two terminals of the transmission line, ensures that, seen from the transmission line, the unit has an output impedance corresponding to the transmission line impedance Z.sub.line.

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