1.times.N communication system for private branch exchange

Telecommunications – Radiotelephone system – Special service

Patent

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Details

455403, 455555, 379159, H04Q 720

Patent

active

058841628

ABSTRACT:
A press-talk trunk is a communication system receives press-talk signals from voice terminals having press-talk switches. In one aspect of the invention, the press-talk trunk is scanned by a central controller that selects an active press-talk signal and sets up a corresponding 1.times.N voice communication path among the terminals. In another aspect of the invention, the press-talk truck itself selects an active press-talk signal and notifies the central controller by means of an interrupt. In yet another aspect of the invention, the press-talk trunk also receives voice signals from all the terminals, selects a voice signal from a terminal having an active press-talk signal, and sends that voice signal back to all the other terminals. In still another aspect of the invention, two or more press-talk trunks are cascaded.

REFERENCES:
patent: 4203011 (1980-05-01), Coviello
patent: 4313033 (1982-01-01), Walker et al.
patent: 4554411 (1985-11-01), Armstrong
patent: 4748655 (1988-05-01), Thrower et al.
patent: 4754476 (1988-06-01), Rasmussen et al.
patent: 4882746 (1989-11-01), Shimada

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