Current sensing trigger for a telephone system

Details Current sensing trigger for a telephone system Current sensing trigger for a telephone system

1981-02-17

1983-02-22

Brown, Thomas W.

H04Q 136

Patent

active

043750141

ABSTRACT:
In a loop closure seizure step-by-step telephone system, a pulsing circuit is provided comprising a current sensing trigger having first and second semiconductor barrier elements disposed in a series circuit relationship for receiving dial pulses generated by a first subscriber telephone set. The dial pulses establish a current through the first and second semiconductor barrier elements and a circuit is provided for sensing a trigger voltage established between first and second semiconductor barrier elements. A circuit is also provided for amplifying this trigger voltage and operating a stepping switch to interconnect the first subscriber telephone set and a second subscriber telephone set pursuant to a number dialed on the first subscriber telephone set.

REFERENCES:
patent: 3466404 (1969-09-01), Topfer
patent: 3488450 (1970-01-01), Davey
patent: 3665109 (1972-05-01), Shaffer
patent: 3676601 (1972-07-01), Shaffer
patent: 3715511 (1973-02-01), Shaffer
patent: 3892926 (1975-07-01), Edwards et al.
patent: 4230912 (1980-10-01), Lee et al.

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