Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!ebersman From: ebersman@uunet.uu.net (Paul Ebersman) Newsgroups: comp.dcom.modems Subject: Re: Problems between T2500 and Hayes V series modems? Message-ID: Date: 22 Feb 91 15:49:30 GMT References: <786@dynasys.UUCP> <25116@netcom.COM> Sender: usenet@uunet.UU.NET Followup-To: comp.dcom.modems Organization: UUNET Technologies, Inc. Lines: 26 Nntp-Posting-Host: cfmartin.uu.net In-reply-to: gandrews@netcom.COM's message of 22 Feb 91 02:19:28 GMT >> From: Greg Andrews; Re: Problems between T2500 and Hayes V series modems?: greg> Posted: Thu Feb 21 20:19:28 1991 > In article <786@dynasys.UUCP> jessea@dynasys.UUCP (Jesse W. Asher) writes: jesse> Has anyone had problems getting a T2500 and a Hayes V series modem jesse> connected? I'm having a strange problem - the modems connect but jesse> connect at 300 or 2400 baud and sometimes the T2500 doesn't get a jesse> CONNECT message. Anyone have any ideas on what could be causing this? greg> I've seen this several times. It only happens when the T2500 calls the greg> V-9600, and the V-9600 is *not* an Ultra 96. If the V-9600 calls the greg> T2500, things are fine. Setting S50=3 (limit the modem to V.22bis and greg> slower modulations) in the T2500 takes care of the problem and the modems greg> connect at 2400 without a hitch. This may be due to the leading v.25 guard tone before PEP, introduced at GE6.00 on the T2500's. There are ways of changing this behavior. Telebit tends to recommend going with a PEP last answer sequence, but you can also vary the duration of the guard tone and when it is presented. Call Telebit for details on the options that are best for you. -- Paul A. Ebersman @ UUNET Communications uunet!ebersman or ebersman@uunet.uu.net The difference between theory and practice in practice is greater than the difference between theory and practice in theory.