Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1985-06-21
1987-02-03
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379361, H04M 100
Patent
active
046409939
ABSTRACT:
A transmission chip for a telephone subscriber's instrument can be used in a variety of modes, some of which involve use with other chips. Depending on which mode is in force, different amplifiers are used. Thus for plain ordinary telephone (POT) service, amplifiers 30,35 and 43 are used, for loudspeaking mode amplifiers 30, 35 and 43 are used, for handsfree use amplifiers 35, 43 and 46 are used, while for VF "dialling" amplifier 46 is used. To save power, the control block (42) detects the mode in which the set is operating and, via a control bus, operates electronic switches to disable the amplifiers not needed.
REFERENCES:
patent: 4409665 (1983-10-01), Tubbs
patent: 4488006 (1984-12-01), Essig et al.
Dwyer James L.
International Standard Electric Corporation
Meagher Thomas F.
O'Halloran John T.
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