Low power emergency telephone mode

Details Low power emergency telephone mode Low power emergency telephone mode

1994-10-11

1996-02-27

Hofsass, Jeffery

Telephonic communications

Call signal generating

379413, 379433, 379399, H04M 1102

Patent

active

054955300

ABSTRACT:
A cordless telephone that may be fully powered by AC main power lines and only partially powered by telephone lines includes structure for producing dual tones, structure for producing dual-tone multifrequency tones from the dual tones, and structure for empowering each of the foregoing in the event of AC main power failure where the only power available passes through the telephone lines.

REFERENCES:
patent: 4953198 (1990-08-01), Daly et al.
patent: 5111499 (1992-05-01), Umemoto et al.
patent: 5117449 (1992-05-01), Metroka et al.
Sony SPP-100 Operating Instruction Manual for Cordless Telephone, 1985.

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