Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!noao!ncar!gatech!prism!gs26
From: gs26@prism.gatech.EDU (Glenn R. Stone)
Newsgroups: comp.dcom.modems
Subject: Re: Problems between T2500 and Hayes V series modems?
Message-ID: <22555@hydra.gatech.EDU>
Date: 21 Feb 91 19:29:10 GMT
References: <786@dynasys.UUCP>
Organization: Dead Poets Society
Lines: 20

In <786@dynasys.UUCP> jessea@dynasys.UUCP (Jesse W. Asher) writes:

>Has anyone had problems getting a T2500 and a Hayes V series modem
>connected?  I'm having a strange problem - the modems connect but
>connect at 300 or 2400 baud and sometimes the T2500 doesn't get a 
>CONNECT message.  Anyone have any ideas on what could be causing this?

Yep.  Incompatible protocols.  The Hayes V-series modems do a fast-turnaround
half-duplex ping-pong weirdness (sorry, Toby) that won't talk to anything
else but another Hayes V at 9600.... so the T2500 negotiates the fastest
speed it can that has a compatible protocol, namely V.22bis at 2400 baud.

I think this one is a candidate for an FAQ....  I also think that anyone
with a V-series that's serious about talking to the world should upgrade
to a T-1600, an Ultra 96, or something else that's truly V.32.... 
(this assumes interactive use and decent lines.... no comment on 
what to use if either or both of these assumptions isn't valid :)

-- Glenn R. Stone
gs26@prism.gatech.edu