Paging system

Details Paging system Paging system

1989-01-19

1990-03-27

Brown, Thomas W.

Telephonic communications

Special services

Audible paging

379 48, 379395, H04M 160

Patent

active

049127578

ABSTRACT:
A paging system for a PBX comprises an amplifier/speaker module adapted to remain coupled across the Ring and Tip lines of a given phase of the PBX. The module responds to audio signals sent through such lines when the conventional polarity of same are reversed and a DC operating bias is applied thereto. The audio signals are superimposed on the DC bias. A relay controls the polarity of the Ring and Tip lines and when activated, reverses the polarity of such lines whereupon the module amplifies the audio signals and applies them to a speaker. The module includes circuitry to prevent the amplifier from operating when the relay is de-energized and Ring and Tip lines are of conventional polarity.

REFERENCES:
patent: 3553386 (1971-01-01), Golembeski
patent: 4013844 (1977-03-01), Saxon
patent: 4440989 (1984-04-01), Gibb
patent: 4656652 (1987-04-01), Nagai

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