Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!think.com!yale!eagle.wesleyan.edu!flinton From: flinton@eagle.wesleyan.edu Newsgroups: comp.dcom.modems Subject: Re: Any way to get rid of 'end of session gobbledy gook'? Message-ID: <1991May14.231556.42791@eagle.wesleyan.edu> Date: 15 May 91 04:15:56 GMT References: <422@wybbs.mi.org> <1991May1.160650.7799@unlinfo.unl.edu> <3267@unocss.unomaha.edu> <3939.282a9a30@hayes.uucp> Organization: Wesleyan University Lines: 31 In article <3939.282a9a30@hayes.uucp>, tnixon@hayes.uucp writes: > > Well, it's not called "sanitary session shutdown" in V.32. It's > known as "GSTN Cleardown". What the modem does is initiate a > retrain request, but turn off all of the "rate bits" that indicate > the speeds at which it is willing to operate. This condition > (unwilling to operate at any speed) is defined as requesting the > call to be cleared. Most modems WILL properly hang up if they > RECEIVE such as cleardown sequence, but not all modems generate it > in response to a request for disconnection from their local DTE > (with DTR drop or ATH command). > Some years ago when I was using only 300 baud (ugh!) my ears could tell me that the reason my sessions with AT&T Mail ended without the gobbledy-gook, while sessions with my university mainframe ended with it, was simply this: AT&T Mail sent a long BREAK signal, during which my modem disconnected noiselessly, while the university simply dropped carrier, leaving my modem trying to interpret meaningless blobs of line noise until it decided there really wasn't any carrier left to demodulate. Not a cleardown sequence in the V.32 sense, but the same effect from my vantage point. [Toby: same thing apply at 1200? at 2400? -- seems to, though my ears fail me.] > > Toby Nixon, Principal Engineer | Voice +1-404-840-9200 Telex 151243420 > Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 > P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon > Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net > Fred E.J. Linton Wesleyan U. Math. Dept. 649 Sci. Tower Middletown, CT 06457 E-mail: or Tel.: + 1 203 776 2210 (home) or + 1 203 347 9411 x2249 (work)