Private automatic business exchange

Details Private automatic business exchange Private automatic business exchange

1989-05-22

1991-12-03

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 97, 379102, H04M 1100

Patent

active

050705237

ABSTRACT:
The invention interfaces a two-wire line to many smart terminals, modems or telephones only one of which is in use at a time. The invention is used by electric utilities in substations to automatically transfer stored data originating in the substation to a central control room.

REFERENCES:
patent: 4121053 (1978-10-01), Dick
patent: 4578534 (1986-03-01), Shelley
patent: 4640988 (1987-02-01), Robinton
patent: 4654869 (1987-03-01), Smith et al.
patent: 4720851 (1988-01-01), Smith
patent: 4788714 (1988-11-01), Hashimoto
patent: 4805210 (1989-02-01), Griffith, Jr.
patent: 4862493 (1989-08-01), Venkataraman et al.
patent: 4953199 (1990-08-01), Hoshi et al.

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