Method and apparatus for discrimination between different kinds

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

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Details

379100, 379373, 358400, H04Q 130

Patent

active

048500089

ABSTRACT:
A data communication station comprises a first and second data terminals operating under first and second transmission standards, and a selective switching means to connect those terminals to a single communication line; the first data terminal is usually a teleprinter or other character-by-character terminal capable of operating under applicable standards such as those for Economy Telex or for DDD (Direct Distance Dialing) ASCII transmissions, whereas the second data terminal may be a facsimile machine or other graphics terminal operating under the CCITT T-series standards. In one embodiment the switching means is a free-standing control unit that may be connected to virtually any conventional data terminals; in another version the switching means is incorporated in an input/output board in one data terminal and utilizes a part of the logic of that data terminal. The switching means normally maintains the two data terminals connected to the communication line with each in its on-hook condition; in response to the ring signal of an incoming call, both data terminals initially go off-hook. The switching means then disconnects one terminal (usually the facsimile terminal) from the line while maintaining an off-hook condition for the line, and monitors the line for occurrence of a recognition signal for the other terminal in a procedure that connects the line to only one of the data terminals to complete the call, depending on the monitoring function.

REFERENCES:
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patent: 4677660 (1987-06-01), Yoshida
"Integrated Switching System" NEAX 51, L. Kohashi et al, NEC Res & Dev. (Japan) No. 55, Oct. 1979.

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