Pulse or digital communications – Repeaters – Testing
Patent
1988-11-07
1991-04-30
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
379 98, H04L 502, H04L 514
Patent
active
050124897
ABSTRACT:
A method for communicating with a plurality of hosts connected to an X.25 network and for selectably using a character as a control character or a data character. Each character received from the X.25 network is inspected to determine if it is one of a set of reserved characters. If so, the character is encoded before being sent to its final destination. Data intended for the X.25 network is inspected for the presence of a predetermined control character. If the control character is present, the next character is inspected to determine whether it is a command character or an encoded data character. If this next character is an encoded data character, it is decoded and provided to the X.25 network. If this next character is a command character, then the command is executed. The method allows the use of any character as either a command character or data character. Data transfer between the DTE and DCE is assigned a PAD and a virtual channel number which corresponds to a particular host on the X.25 network. The channel number may, but need not, be the same as the X.25 device address for that host. The method therefore allows the DTE and DCE to simultaneously communicate with a plurality of X.25 hosts over a single telephone line or physical transmission link.
REFERENCES:
patent: 4700358 (1987-10-01), Duncanson et al.
patent: 4751510 (1988-06-01), de Saint Michel et al.
patent: 4761646 (1988-08-01), Choquet et al.
patent: 4890316 (1989-12-01), Walsh et al.
patent: 4893305 (1990-01-01), Fernandez et al.
ANSI Standard X3.4 (1977), pp. 10, 18-23.
CCITT Standard X.25 (1976, 1980, 1984).
Evercom 12e/24e External Modems Owner's Manual and Reference Guide, pp. 72-88 and 95-106; copyright 1987.
Becker Larry D.
Burton Richard J.
Copeland, III John A.
Jerrim John W.
Nixon Toby L.
Hayes Microcomputer Products, Inc.
Olms Douglas W.
Smith Ralph
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