Order wire device having function for reducing noise in communic

Details Order wire device having function for reducing noise in communic Order wire device having function for reducing noise in communic

1992-06-04

1994-09-13

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of centralized switching system

379338, 3701001, 3408252, 34082508, H04M 124, H04M 100, H04J 306, G05B 2302

Patent

active

053475658

ABSTRACT:
An order wire device in a communication system having a plurality of order wire devices, signals output from each of the order wire devices being serially transmitted to remaining order wire devices, each of the order wire devices being capable of simultaneously calling remaining order wire devices in an all station calling mode. The order wire device includes, a tone ringer circuit for outputting a ring-back-tone signal, a first detection circuit for detecting a request for a call in the all station calling mode, a first control circuit for activating the tone ringer circuit when the first detection circuit detects the request, a second control circuit for inactivating the tone ringer circuit when an off-hook operation is carried out in response to the request, a signal output circuit for outputting a stop signal when the first detection circuit detects the request and the off-hook operation is carried out, a second detection circuit for detecting a stop signal output from an order wire device in which the off-hook operation has been carried out, and a third control circuit for inactivating the tone ringer circuit when the first detection circuit detects the requirement and the second detection circuit detects the stop signal.

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