Signalling and channel loop test circuits for station carrier te

Details Signalling and channel loop test circuits for station carrier te Signalling and channel loop test circuits for station carrier te

1980-06-12

1984-02-14

Popek, Joseph A.

H04B 346

Patent

active

044318758

ABSTRACT:
A plural channel amplitude modulated station carrier telephone system having a special synchronous ring detector circuit located in a station or terminal at the subscriber's end of the transmission line for signaling an incoming call for the subscriber's telephone and a special channel loop test circuit also located in the station mentioned above and employing one of the signals used in the synchronous ring detecting operation to turn on a subscriber's transmitter circuit for effecting a channel loop test.

REFERENCES:
patent: 4045624 (1977-08-01), Browne
patent: 4081609 (1978-03-01), Beene et al.
patent: 4170722 (1979-10-01), Blackburn

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