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- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Fri, 25 Dec 92 23:59:24 CST
- From: Jack.Winslade@ivgate.omahug.org (Jack Winslade)
- Newsgroups: comp.dcom.telecom
- Subject: Strange LD Problem With Modems
- Reply-To: jack.winslade%drbbs@ivgate.omahug.org
- Message-ID: <telecom12.916.7@eecs.nwu.edu>
- Organization: DRBBS Technical BBS, Omaha
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 916, Message 7 of 11
- Lines: 63
-
- We feed a site down in Lawrence, KS. They usually poll once every
- evening using dial-1 AT&T. We had good transfers up until recently.
- They bought a new modem, a Supra v.32bis. It worked fine for a while,
- but ...
-
- I got a call from him tonight stating that his sessions are being cut
- off as if the carrier was dropped after a few minutes. He forced a
- poll while I was watching, and I noticed garbage streaming and the CD
- flashing on and off. I suggested that he change back to the original
- modem (a USR Dual, square LEDs) and try the poll again. He did, and
- the session barfed about two minutes into the data transfer. It was
- as if somebody had simply pulled the plug. I watched this a couple of
- times, and BOTH ends showed hangup and failed session.
-
- I then had him repeat the poll with Sprint, with the same results.
-
- I then forced a call to him. The session went perfectly. Several
- batches, about 1.5 megs total. I was using AT&T.
-
- Has anyone ever encountered anything like this? I've seen hundreds of
- random failed sessions and idiopathic disconnects, but never those
- that were as easily repeatable.
-
- We're using a TB Worldblazer with the latest non-fax ROM revision on
- this end. We have a rather new but burned-in #5 ESS <tm> on this end
- and, from the sound of the call-waiting clicks on his voice line, it
- appears that he has a #1 or #1A ESS <tm> in Lawrence. He's noticed
- this on both the Supra and the USR. (The Supra is definitely bad, and
- is going back.)
-
- It amazes me that the sessions are totally clean one way, but
- regularly and repeatedly disconnect the other way. I think we've
- shown that it is not the modem on his end or the LD carrier. Anyone
- care to guess?
-
-
- Good day. JSW
-
- Ybbat (DRBBS) 8.9 v. 3.14 r.1
- DRBBS - Merry Christmas -- Happy Hanukkah (1:285/666.0)
-
-
- [Moderator's Note: Let's use a process of elimination. What is the one
- thing in common about all the bad, failed connections? He originated
- the call. The Supra and the USR modems couldn't change it. Two
- different modems: both bad ... doubtful. First on one carrier, then on
- another (Sprint): neither carrier able to deal with it ... doubtful.
- When you call him, the modem works fine and the carrier handles it
- with no problems. Try these things:
-
- Call him a few more times. See if it always works okay using various
- carriers and even various modems on his end. Have him try to call some
- other site on the opposite end of the earth, or at least in some other
- part of the Land of Ahs ... still screwing up? Maybe inadvertently
- some obscure piece of code in the uucp software went bad; something
- that is only used when he originates uucp ... but not when he receives
- uucp. Have him use the phone line normally used to poll to call your
- line voice; the two of you can chat for a few minutes and see if the
- line is (or gets) trashed out after a few seconds or a couple minutes.
- If so, then the problem may be with telco. Keep these tests up until
- you find one unique element always present in the bad connections. PAT]
-
-