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From: tron@nsc.UUCP
Newsgroups: comp.unix.wizards,comp.unix.questions
Subject: Modem hangup difficulties under 4.3BSD on a VAX
Message-ID: <4183@nsc.nsc.com>
Date: Wed, 8-Apr-87 14:10:58 EST
Article-I.D.: nsc.4183
Posted: Wed Apr  8 14:10:58 1987
Date-Received: Sat, 11-Apr-87 07:42:35 EST
Organization: Rational Swamiconductor, Sanivale
Lines: 23
Keywords: hayes modems 4.3bsd hangup
Xref: utgpu comp.unix.wizards:1705 comp.unix.questions:1655

At nsc we have noticed a problem with our modem lines which is becoming
quite annoying.  When somebody leaves a process in background and then
logs out the modem does not hangup.  Then, when another call comes in on
that modem it does not answer.  Everything seems to work correctly when
no background processes remain.

We are running 4.3BSD on a VAX-11/785, with Hayes Smartmodem 1200s connected
to DHU-11s.  Modem control is enabled on the DHU-11 lines, and all switches
are up on the Hayes modems except 4 and 8, which are down.  These are the
newer Smartmodems with 10 switches instead of 8.  A typical session that
causes the trouble is:

	% make >& make.out &
	% logout

Please respond by mail if you have seen this before, know what might be
wrong or know how to fix this undesireable behavior.

Thanks in advance
-- 
   tron  |-<=>-|    ARPAnet: nsc!tron@sun.COM
  tron@sc.nsc.com   UUCPnet: {amdahl,decwrl,hplabs,pyramid,sun}!nsc!tron
(C)Copyr 1987 Ronald S. Karr; you can redistribute only if your recipients can.