Pulse or digital communications – Repeaters – Testing
Patent
1986-08-28
1988-11-01
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375121, 370 24, H04B 138
Patent
active
047824980
ABSTRACT:
The preferred embodiment (11) of the modem comprises a control unit (13), a memory (27), a switch (14), and a modem engine (17). The modem engine (17) establishes communications with a modem (30) using conventional handshake methods. The control unit (13) then initiates a special handshake sequence composed of nonprintable, opposing characters to the modem (30) via the switch (14) and the modem engine (17). If the modem (30) completes the special handshake sequence then the control unit (13) and the modem (30) exchange the desired information. If the modem (30) does not complete the special handshake sequence then the preferred embodiment (11) functions as a conventional modem. The use of nonprinting, opposing characters for the special handshake sequence prevents the special handshake sequence from adversely affecting the external devices (10) (34).
REFERENCES:
patent: 4000371 (1976-12-01), Ogawa
patent: 4215243 (1980-07-01), Maxwell
patent: 4387440 (1983-06-01), Eaton
patent: 4549302 (1985-10-01), Heatherington
patent: 4620294 (1986-10-01), Leung et al.
patent: 4680773 (1987-07-01), Amundson
patent: 4680781 (1987-07-01), Amundson et al.
CCITT Recommendation v. 22 Bis; 1984; "2400 Bits Per Second Modem . . . ".
Chin Stephen
Griffin Robert L.
Hayes Microcomputer Products, Inc.
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