Power line carrier telephone extension system for full duplex co

Details Power line carrier telephone extension system for full duplex co Power line carrier telephone extension system for full duplex co

1982-09-30

1985-04-30

Rubinson, Gene Z.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340310R, 370 71, H04M 1100

Patent

active

045145946

ABSTRACT:
In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and one or more extension telephones over the AC electric power line available at a telephone subscriber's premises, that includes a main station for processing signals between the subscriber's telephone line and power lines and one or more extension telephones of the system that plugs into the power line, all of which can place calls to the telephone line, answer calls from the telephone line and conference together in full duplex communication, means at the extension telephones for initiating a telephone line hold signal that is transmitted over the power line to the main station where the hold signal is detected and initiates connecting a hold impedance across the telephone line.

REFERENCES:
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patent: 3876984 (1975-04-01), Chertak
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patent: 4210779 (1980-07-01), Simokat
patent: 4239940 (1980-12-01), Dorfman
patent: 4323882 (1982-04-01), Gajjar

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