System allowing selective connection of various types of externa

Details System allowing selective connection of various types of externa System allowing selective connection of various types of externa

1988-02-19

1990-01-09

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379102, 379378, 379430, 379442, H04M 1100

Patent

active

048933317

ABSTRACT:
A system allowing selective connection of various types of external apparatuses to a telephone set, which system comprises a plurality of switching circuits connected to the external apparatuses and a plurality of external apparatus interface circuit having mutually different characteristics and connected through the plurality of switching circuits to the external apparatuses, wherein any one of these switching circuits is turned on and at the same time the other circuits are turned off to selectively connect one of the interface circuits to one of the external apparatuses.

REFERENCES:
patent: 4146754 (1979-03-01), Rose
patent: 4367374 (1983-06-01), Serrano
patent: 4397767 (1983-07-01), Shum
patent: 4449017 (1984-05-01), Burke et al.
patent: 4524244 (1985-06-01), Faggin et al.
patent: 4558178 (1985-12-01), Yasuda et al.
patent: 4578537 (1986-03-01), Faggin et al.

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