Connecting circuit for a telephone line

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

1980-04-21

1982-01-26

Robinson, Thomas A.

179 18FA, H04M 302, H04B 336

Patent

active

043130348

ABSTRACT:
Connecting circuit for a telephone line comprising a pair of amplifiers whose outputs 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 negatively affect the proper functioning of the connecting circuit constitute a problem. The connecting circuit uses four current detection circuits (3, 4, 5, 6) for separately detecting the positive and negative currents in the wires of the telephone line. These separately detected currents are processed so that the desired opeeration of the connecting circuit is maintained even in the presence of longitudinal currents which exceed the loop currents.

REFERENCES:
patent: 4099032 (1978-07-01), Roge et al.
patent: 4192974 (1980-03-01), Kiko
patent: 4203009 (1980-05-01), Tattersall

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