Communication system having telephonic function

Details Communication system having telephonic function Communication system having telephonic function

1988-09-30

1990-04-10

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379 93, 379110, 358440, H04M 1100, H04N 132

Patent

active

049167324

ABSTRACT:
A communication system having a telephonic function suitably adopted for a facsimile system, in which a telephone module includes: a cell signal selecting circuit connected to a telephone line, for selecting and receiving station call signals; a key board having input/output lines of two systems, one for outputting receiving station information to the call signal selecting circuit and another for a facsimile module; switches interposed in lines between the key board and the cell signal selecting circuit, functioning so as to be shut off during the operation of the facsimile module and to be conductive during the non-operation thereof; third system lines individually connected to lines between the respective switches and the call signal selecting circuit; and photocouplers for electrically isolating each of the third system lines during the non-operation of the facsimile module and making the third system lines conductive during the operation thereof, and for inputting the receiving station information to the call signal selecting circuit.

REFERENCES:
patent: 4754335 (1988-06-01), Izawa et al.

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