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.
Brown Thomas W.
International Standard Electric Corporation
Raden James B.
Warner Delbert P.
LandOfFree
Line condition signalling system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Line condition signalling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line condition signalling system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1812990