Line condition signalling system

Details Line condition signalling system Line condition signalling system

1974-01-31

1976-01-27

Brown, Thomas W.

H04M 322

Patent

active

039353931

ABSTRACT:
The symmetrical line loop evaluating circuit included in this signalling system and used to pass or to block interrogating pulses to examine the closed or open condition of a subscriber line includes a first circuit comprising a diode the anode and cathode of which are capacitively coupled to the output and input of an interrogating and receiving circuit respectively and a second or gating circuit which prevents surge voltages from reaching the input of the receiving circuit in the case of an open line loop. The system will be manufactured in the thick-film version.

REFERENCES:
patent: 2892037 (1959-06-01), Feiner
patent: 3414678 (1968-12-01), Hackenberg
patent: 3573383 (1971-04-01), Lauwers et al.
patent: 3713103 (1973-01-01), Risky
patent: 3808377 (1974-04-01), Young
patent: 3855421 (1974-12-01), Pilling et al.

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