Premises page/intercom system utilizing telephone set component

Details Premises page/intercom system utilizing telephone set component Premises page/intercom system utilizing telephone set component

1987-03-02

1988-06-28

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379164, 379160, H04M 342

Patent

active

047544767

ABSTRACT:
A premises in which a plurality of telephone sets (10, 12) are used is provided with dedicated intercom wiring (1, 6) having its own power source. Each telephone set (10, 12) includes standard telephone circuitry (20), for communicating off premises, and also includes an intercom circuit (21). A switch (22) is provided for switching the receiver and transmitter (HS) of each set (10, 12) between off premises communications and intercom use. Each set (10, 12) includes a paging speaker (LS1) that is a part of the intercom system. To page, a button (96) is depressed at one station and the user talks into the transmitter at that station. The transmitted message is broadcasted through the speaker (LS1) at each telephone set in the system except the one that is sending the message. The intercom system control utilizes the same wire over which the audio signal is transmitted. The paging circuitry is off when the system voltage is at a particular level and is turned on by changing the system voltage to a different level.

REFERENCES:
patent: 4132860 (1979-01-01), Rasmussen
patent: 4228324 (1980-10-01), Rasmussen et al.
patent: 4323734 (1982-04-01), Kimzey
patent: 4511767 (1985-04-01), Wetzel et al.

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