Path: utzoo!attcan!uunet!fernwood!apple!sun-barr!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!ub!rutgers!pyrnj!bartal!monymsys!david
From: david@monymsys.uucp (David Kozinn)
Newsgroups: comp.dcom.modems
Subject: Re: T2500 Connection Problem
Message-ID: <1990Nov5.165839.921@monymsys.uucp>
Date: 5 Nov 90 16:58:39 GMT
References: <6480@emory.mathcs.emory.edu>
Organization: MONY Financial Services, Microcomputer Systems, Teaneck, NJ
Lines: 36

In article <6480@emory.mathcs.emory.edu> km@mathcs.emory.edu (Ken Mandelberg) writes:
>We are having some problems connecting to some new rackmount T2500
>modems running Version GE7.00-T2500RM firmware. These modems are
>setup to offer V.32 tones first (S92=1) and PEP at the end.
>
>The problem I have first hand knowledge of is trying to connect
>to these with a T2000 that wants a PEP connection (S50=255).
>The T2000 waits patiently thrrough the V.32 and V.22 offerings,
>but for some reason doesn't take the bait when the PEP tones
>finally appear. 

As someone else noted, there is a register that controls echo surpression when
running on the SPRINT phone system. I had the same problem described (though
it was a T2500 that couldn't connect to Trailblazer Plus modems with a ROM
revision less than 5.00), and the fix was to set register 120 to 16 (using
ATS120=16&Wx). Apparently, there may be some problems if you call out or in
using SPRINT, but my company uses SPRINT for it's long distance calling and I
haven't seen any problems (yet!) If you find problems on outgoing call, you
could always put ATS120=0 as part of your dialing string.

>The V.32 users with non Telebit modems say they have trouble
>connecting in V.32 mode. They say the T2500 hangs up on them.
>
>Any ideas on what may be bothering the V.32's?

I had problems with a Hayes Ultra V-series before I reversed the tones (to PEP
last). The Hayes decided to connect at 300 baud (!) for some unknown reason. I
was able to fix this pretty easily by changing the Hayes' dial script to
include ATN0S37=9, which forces a 9600 baud connect. Obviously, this will
differ if you're using a different modem.

-- 
David Kozinn                     | UUCP:   uunet!vmp!monymsys!david
MONY Financial Services MD 75-14 | Domain: monymsys!david@vmp.com
Glenpointe Centre West           | GEnie:  D.KOZINN 
Teaneck, NJ 07666-6888           | Phone:  +1-201-907-6990