Path: utzoo!telecom-request Date: Wed, 22 May 1991 04:43:38 GMT From: Bud Couch Newsgroups: comp.dcom.telecom Subject: Re: Hayes Wins Damages on its Command Set Patent Message-ID: Organization: Kentrox Industries, Inc. 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 386, Message 3 of 8 Lines: 27 In article nanook@eskimo.celestial.com (Robert Dinse) writes: > Since the timed escape is an essential part of the command set, > it is impossible for a modem manufacturer to claim Hayes compatability > without it. Thus, Hayes, if successful at enforcing this patent, has a > 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. I was writing from my own rather parochial point of view. My company (that is, the one I work for, not own) makes Switched 56 DSU's. These are 56 kB _synchronous_ units. We use a separate _async_ command port (separate from the data port which handles the signal going to the far end) to take care of configuration, maintenence, and call control. The language used by that command port is the AT set. To call a number, the command ATDxxxxxxxx is entered to the command port. When the far end answers, the data is sent through the data port. To disconnect - ATH0. No "(pause)+++", no patent infringment. Bud Couch - ADC/Kentrox If my employer only knew. standard BS applies