Battery-powered adapter

Details Battery-powered adapter Battery-powered adapter

1995-08-01

1998-12-08

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

358434, 358442, 37910002, H04M 1100

Patent

active

058481354

ABSTRACT:
A normally straight-through connection from a computer fax modem to a fax machine, or other fax sender to fax receiver, is briefly interrupted under battery power to supply the fax modem with a simulated dialtone and the fax machine with a simulated ring signal, which is supplied via a DC-to-DC converter activated by the same clock signal from which the dialtone and simulated ring signal are derived.

REFERENCES:
patent: 4192007 (1980-03-01), Becker
patent: 4652933 (1987-03-01), Koshiishi
patent: 4930017 (1990-05-01), Izawa
patent: 4964154 (1990-10-01), Shimotono
patent: 4991200 (1991-02-01), Lin
patent: 4998248 (1991-03-01), Matsuzaki
patent: 5452106 (1995-09-01), Perkins
patent: 5588047 (1996-12-01), Rosengren et al.
PC Zone Catalog At 90.
Zoom Telephonics Comdex Advertisement, Spring 1990.
Reyes, Zoom Telephonics Ex Command Language, Aug. 1, 1990.

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