Fail-safe digital phone

Details Fail-safe digital phone Fail-safe digital phone

1984-07-05

1986-03-11

Dwyer, James L.

179 27G, H04M 358

Patent

active

045755841

ABSTRACT:
A fail-safe digital telephone set of the present invention is operatively connected to a digital PBX which has at least one digital telephone set attached thereto and which further interfaces with telephone lines to a central office. The fail-safe digital phone includes logic for providing digital communication of voice information with the PBX, logic for providing analog communication of voice information with the telephone lines, and a switching element which activates the digital logic and connects the digital logic to the PBX.
In the event of failure of the PBX, the switching element activates the analog logic and connects the analog logic to the telephone lines.

REFERENCES:
patent: 4100375 (1978-07-01), Noller
patent: 4211895 (1980-07-01), Davis et al.

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