Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site umree.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!ihnp4!mgnetp!we53!busch!wucs!umree!rwl From: rwl@umree.UUCP (Wayne Little) Newsgroups: net.unix-wizards,net.bugs.uucp Subject: Re: Help sought on problem with uucp acucntrl Message-ID: <108@umree.UUCP> Date: Thu, 31-Oct-85 17:43:36 EST Article-I.D.: umree.108 Posted: Thu Oct 31 17:43:36 1985 Date-Received: Sun, 3-Nov-85 05:28:55 EST References: <106@umree.UUCP> Organization: University of Missouri - Rolla,Rolla MO Lines: 29 Keywords: uucp modem Xref: watmath net.unix-wizards:15555 net.bugs.uucp:622 Summary: Resolution to no-getty dial in & out acucntrl problem via connecting more RS 232 leads in the cable In article <106@umree.UUCP>, rwl@umree.UUCP (Wayne Little) writes: > We are experiencing a side effect with the acucntrl part of uucp 4.3. > The dial out part "turns off" the getty and works fine, but the getty does > not get restarted on the line & I can't get it to come back (kill -HUP 1 > doesn't work, and the line in /etc/ttys is enabled). The FIX involved wiring up leads 1-8 & 20 of the RS 232 cable to the modem. [We didn't have any flat 25 wire cable, & I knew the others weren't used much in the RS 232 protocol; we only had 2, 3 & 7 before - dumb, I know (now).] A hypotheis of the problem, supplied by Dave Greunke - {seismo,ihnp4,harpo}!uwvax!astroatc!vid, follows. The key may be the cabling to your modem. We have a 25 conductor flat cable going from our modems to the Able DH-11 multiplexers so all signals are brought thru to the modems (We use Ventel 212+ rackmounts). I have poked thru the acucntrl code a bit (I don't claim to understand it yet) and I know that Sebok pokes into the kernel tty structures (via /dev/kmem) and fiddles with the modem control bits of the the multiplexers. What may be happening is acucntrl may drop DTR from the mux (to reset the modem) and then expects the modem to respond (with what I'm not quite sure). If the modem doesn't respond the mux may hang. A side note is that other people have experienced the getty not being put back on the line following the acucntrl poking, UNTIL someone dialed in on the line, and then all was well. This was not the case with ours. Thanks also to Kurt Haserodt (ihnp4!wucs!kurt) who also suggested running a cable with the DTR lead in it, and to David Herron (cbosgd!ukma!david) for his reply.