Path: utzoo!telecom-request Date: 20 May 91 16:20:40 GMT From: Alan Bland Newsgroups: comp.dcom.telecom Subject: Re: Hayes Wins Damages on its Command Set Patent Message-ID: Organization: TELECOM Digest Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 381, Message 1 of 10 Lines: 19 In article , nanook@eskimo.celestial.com (Robert Dinse) writes: > monopoly on this kind of modem. Indeed, I can't think of a way you > could escape from data mode to command mode not using a timed delay > and some unique sequence, that wouldn't be possibly contained in > transmitted data. One technique I've seen is to use a timed BREAK to switch to command mode. A short BREAK is passed on the communications line, but a longer one (e.g. two seconds) goes to command mode. So there is indeed another way to do it without infringing on the Hayes patent, though you'd probably be violating someone else's patent :-) Alan Bland att!druwy!mab == mab@druwy.ATT.COM AT&T Bell Laboratories, Denver CO (303)538-3510