Power-failure resistant communication system

Details Power-failure resistant communication system Power-failure resistant communication system

1997-10-08

1999-01-05

Shankar, Vijay

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

379 1, 379 2, 379 8, 379164, 455564, 455565, 455572, H04M 124, H04M 322, H04M 100

Patent

active

058570101

ABSTRACT:
A communication system for connecting a terminal through a communication channel for a communication signal and a control channel for the control signal is constructed by a decoder for decoding a dial signal such as a push button signal that is generated from the terminal, a transmitting unit for transmitting a dial signal according to an output of the decoder to an external line at the time of a current supply, a power supply unit for supplying a current to a dial signal generator provided for the terminal when the terminal is in an off-hook state, and a setting unit for setting control data for the communication system in accordance with the output of the decoder, wherein when a power failure occurs, the dial signal that is generated from the terminal is transmitted to the external line without passing through the decoder.

REFERENCES:
patent: 4012601 (1977-03-01), Kehren
patent: 4187414 (1980-02-01), Fahrenschon
patent: 4232199 (1980-11-01), Boalwright
patent: 4381427 (1983-04-01), Cheal
patent: 4564724 (1986-01-01), Nakayama
patent: 4853949 (1989-08-01), Schorr
patent: 4972452 (1990-11-01), Chack
patent: 5216704 (1993-06-01), Williams
Examiner's Office Action Letter (translation) dated Feb. 6, 1998 for corresponding Japanese application.

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