Interface circuit between a subscriber's telephone line and exch

Details Interface circuit between a subscriber's telephone line and exch Interface circuit between a subscriber's telephone line and exch

1988-12-28

1990-01-30

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379399, H04M 1900

Patent

active

048978728

ABSTRACT:
An interface circuit between a subscriber's telephone line and exchange control components, with a reduced current consumption in the case of a grounded cable, includes a control circuit which senses the increase in the amplitude of the longitudinal currents on the line due to the grounded cable condition and consequently controls the disconnection of the current supplied to the line. However, the line is still supplied periodically for very short periods so as to reduce as far as possible current consumption during the grounded cable condition, but to allow the control circuit to sense the removal of the breakdown and to restore the normal current supplied to the line.

REFERENCES:
patent: 4709296 (1987-11-01), Hung et al.
patent: 4718084 (1988-01-01), Dragotin
patent: 4782507 (1988-11-01), Siligoni et al.

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