Cross point switch with power failure mode

Details Cross point switch with power failure mode Cross point switch with power failure mode

1993-08-05

1995-06-13

Dwyer, James L.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379306, 379307, 379335, H04M 1900

Patent

active

054250943

ABSTRACT:
A cross point switch mounted on a telephone-related device such as a telephone. When an alternate power source request signal is low, switches are controlled in response to external data. When the signal is high, a predetermined switch or switches are forced to be turned on and other switches are forced to be turned off. As a supply voltage obtained from a commercial power supply drops, the request signal goes high. When the request signal is high, a voltage obtained from telephone line power is supplied only to necessary electric circuits. Only the most basic functions such as talking over a telephone line can be used such that power consumption can be minimized.

REFERENCES:
patent: 3859471 (1975-01-01), Danielsen et al.
patent: 3872439 (1975-03-01), Salam
patent: 4327255 (1982-04-01), Suszylo
patent: 4635250 (1987-01-01), Georgiou
patent: 4635288 (1987-01-01), Stadius
patent: 5081668 (1992-01-01), Ito
patent: 5113431 (1992-05-01), Horn
patent: 5220597 (1993-06-01), Horiuchi

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