Dial-up line modem directly compatible with mainframe host havin

Details Dial-up line modem directly compatible with mainframe host havin Dial-up line modem directly compatible with mainframe host havin

1987-01-28

1989-08-01

Brigance, Gerald L.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

H04M 1532

Patent

active

048539546

ABSTRACT:
The modem of this invention is capable of direct connection to a communication Host associated with a mainframe computer which uses a bisynchronous (bisync) protocol so that the Host believes a valid terminal is continuously connected regardless of whether the modem is online or offline. This permits communications to be established with the mainframe over the public switched telephone network.

REFERENCES:
patent: 3979719 (1976-09-01), Tooley et al.
patent: 4385384 (1983-05-01), Rosbury et al.
patent: 4393501 (1983-07-01), Kellogg et al.
patent: 4429382 (1984-01-01), Greenstein et al.
patent: 4549297 (1985-10-01), Nishimoto
patent: 4665521 (1987-05-01), Smith
patent: 4700358 (1987-10-01), Duncanson et al.
patent: 4715044 (1987-12-01), Gartner
The publication All about Modems and Related Topics by John A. Jurenko, Publication No. 7, Oct. 1981, pp. 245-249.
The manual for the "LineMaster" manufactured by Microframe, Inc., pp. 1-12.

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