Connecting circuit for a telephone line

Details Connecting circuit for a telephone line Connecting circuit for a telephone line

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) H04M 3/00 (2006.01) H04M 19/00 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 1143493

1 PHN. 9457. ABSTRACT: Connecting circuit for a telephone line comprising a pair of amplifiers whose out- puts are connected to the one and to the other wire of the telephone line, respectively. Longitudinal currents which are induced in the telephone line and may nega- tively affect the proper functioning of the connecting circuit constitute a problem. The connecting circuit uses four current detection circuits for separately detecting the positive and negative currents in the wires of the telephone line. These separately detected cur- rents are processed so, that the desired operation of the connecting circuit is maintained even in the presence of longitudinal currents, which exceed the loop currents. The circuit is used for the connection of subscriber's line to automatic telephone exchanges.

351110

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