Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!rpi!masscomp!peora!tarpit!bilver!bill
From: bill@bilver.uucp (Bill Vermillion)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit T2500 -> TB+ UUCP spoofing problem, HELP
Keywords: uucp spoofing T2500 TELBIT
Message-ID: <1991Mar4.030916.3429@bilver.uucp>
Date: 4 Mar 91 03:09:16 GMT
References: <554@shograf.COM>
Organization: W. J. Vermillion - Winter Park, FL
Lines: 43

In article <554@shograf.COM> jim@shograf.COM (jim morris) writes:
 
>	I have been having a problem, and was hoping that someone else
>has seen, and solved, this problem.
 
>I am getting my news files batched, compressed and about 100-50k blocks.
>After recving about 10 or so, (Sometimes less sometime more), files the
>modems stop talking to each other. I can see my end timeing out and resending
>something (Probabably ACK??). But I never get anything back from the other
>side. The same effect can be achieved by enabling XON/XOFF control in the
>modem and recving an XOFF. (But that is NOT what is happening).
>Both modems have NO flow control enabled, they both rely on UUCP protocol
>for the handshaking. Someone is locking up... Either my modem is not sending
>any more, or the other side is not recving or sending anymore.
>I have tried every S register setting I, or telebit support, can think of
>to no effect. Of course UUCP eventually times out and hangs up.
>I get the interrupted file on the next dial-in.
 
>Anyone got any idea what this problem is!! Has anyone else seen this problem.
 
Hm.  When I started having this problem last summer I thought it might have
been the machine I was using for transmission (old R/S6000 ) but it
continued when I moved over to a '386 box.  Unit was a Trailblazer plus.

T'bit support gave me all sorts of undocumented registers, and we tried
them all.  Nothing. Nada. Zip.  Still the problem.  I would get a lockup
after about 150k was sent.   A big file,  or smaller files.  With the
smaller files all was fine until total data transmitted was in the 150k to
200k range (typically).   Sometimes a big file would go all the way
through.

This is with uucp g spoofing and cts/rts flow contol, as opposed to your
xon/xoff.   T'bit said they had not seen anything like this.  Well that now
makes two of us doesn't it.

It pointed to the modem itself.  Late December I switched over to a T2500.
Guess what.  Still happens.   I think it is the serial ports.   Have the
wiring done and will try the changeover tonight.  You are not alone.


-- 
Bill Vermillion - UUCP: uunet!tarpit!bilver!bill
                      : bill@bilver.UUCP