Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1988-02-29
1989-07-18
Schreyer, Stafford D.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
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:
patent: 3558811 (1971-01-01), Montevecchio
patent: 3830962 (1974-08-01), Mailloux
patent: 3958088 (1976-05-01), Vieri
patent: 4297727 (1981-10-01), Ogawa et al.
patent: 4490746 (1984-12-01), Moriguchi
patent: 4494149 (1985-01-01), Furukawa
patent: 4558369 (1985-12-01), Shinohara et al.
patent: 4578537 (1986-03-01), Faggin et al.
patent: 4583124 (1986-04-01), Tsuji et al.
patent: 4584434 (1986-04-01), Hasimoto
patent: 4620294 (1986-10-01), Leung et al.
patent: 4639553 (1987-01-01), Kiguchi
patent: 4652933 (1987-03-01), Koshiishi
patent: 4658417 (1987-04-01), Hashimoto
patent: 4663778 (1987-05-01), Takahashi
patent: 4672459 (1987-06-01), Kudo
patent: 4677660 (1987-06-01), Yoshida
"Integrated Switching System" NEAX 51, L. Kohashi et al, NEC Res & Dev. (Japan) No. 55, Oct. 1979.
Berg Joseph F.
Chalupa Rudolf P.
Pokala Prabhakar
Extel Corporation
Schreyer Stafford D.
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