Method of and a circuit arrangement for determining current crit

Details Method of and a circuit arrangement for determining current crit Method of and a circuit arrangement for determining current crit

1982-09-27

1986-06-17

Dwyer, James L.

179 16F, 1791753R, H04M 176

Patent

active

045957967

ABSTRACT:
A method of and a circuit for determining current criteria in a subscriber's loop of a telephone system are described. Two constant-current sources are symmetrically connected to two wires of the loop and are controlled by an adjustable reference voltage source. Voltage signals on the voltage source are evaluated in a detecting circuit to determine the actuation of a ground button on the subscriber's set or the occurrence of a ground short-circuit. A testing device is connectable to the subscriber's loop to simulate various conditions of the subscriber's set.

REFERENCES:
patent: 3636280 (1972-01-01), Wetzel
patent: 3916110 (1975-10-01), Lee et al.
patent: 4433213 (1984-02-01), Albers et al.

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