Current sensing trigger for a telephone system
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United States of America Patent
Stats
-
Feb 22, 1983
Grant Date -
N/A
app pub date -
Feb 17, 1981
filing date -
Feb 17, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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