Path: utzoo!censor!geac!torsqnt!hybrid!scifi!bywater!uunet!fciva!dag
From: dag@fciva.FRANKCAP.COM (Daniel A. Graifer)
Newsgroups: comp.dcom.modems
Subject: Re: Trouble w/ TB+ calling T2500 in PEP/UUCP mode
Message-ID: <583@fciva.FRANKCAP.COM>
Date: 19 Jan 91 21:49:29 GMT
References: <577@fciva.FRANKLIN.COM> <38156@cup.portal.com>
Reply-To: dag@fciva.UUCP (Daniel A. Graifer)
Distribution: na
Organization: Coastal Capital Funding Corp., McLean, VA
Lines: 30

In article <38156@cup.portal.com> cec@cup.portal.com (Cerafin E Castillo) writes:
>Try setting S92=0 (PEP, V.25...) and see if anything changes.  If not,
>there may be a problem with the calling modem hearing the answering
>modem.  There is a problem with the automatic gain control (AGC) in
>earlier revisions of modem firmware.  I have seen various net users
>post their experiences with this problem to this group.  If this is
>the problem, then the calling modem is not hearing the answering modems
>tones.  Telebit Tech Support is best at dealing with this.  You can
>reach them at 1-800-TELEBIT.  Good Luck!
>
>Cerafin E. Castillo 

Well I tried setting S92=0, and started connecting.  Very Strange!  So I
called Telebit Tech Support as suggested.

Telebit had me try setting the undocumented register S120=16.  I asked him
what this register did, and he said something about V.25 and echo 
suppression.

Anyways, it works.  I can now connect in PEP mode between my TB+ and my
T2500 with the latter trying PEP tones last.

Anyways, many thanks to Cerafin, (and of course to Telebit!).

Dan
-- 
Daniel A. Graifer			Coastal Capital Funding Corp.
Sr. Vice President, Financial Systems	7900 Westpark Dr. Suite A-130
(703)821-3244				McLean, VA  22102
uunet!fciva!dag				fciva.FRANKCAP.COM!dag@uunet.uu.net