Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!mit-eddie!bloom-beacon!apple!vsi1!lmb
From: lmb@vicom.COM (Larry Blair)
Newsgroups: comp.mail.uucp
Subject: Re: Bidirectional Modem Lines under SunOS 4.0.1
Message-ID: <1621@vicom.COM>
Date: 5 Apr 89 17:18:07 GMT
References: <160@osc.COM> <743@key.COM>
Reply-To: lmb@vicom.COM (Larry Blair)
Organization: VICOM Systems Inc., San Jose, CA
Lines: 23

In article <743@key.COM> perry@arkon.key.COM (Perry The Cynic) writes:
=In article <160@osc.COM> stephen@osc.UUCP (H. Stephen Au-Yeung) writes:
=> 
=> According to "Managing UUCP and Usenet" by O'Reilly & Associates (A Nutshell
=> Handbook), SunOS has a mechanism of its own that allows a port to be used in
=> both directions.   I have tried to follow that mechanism (on page 34-35) but
=> everytime when getty tries to open /dev/ttyd? it gets through! Could someone
=> please tell me what I have done wrong (we use Telebit T1000 modems)? Thanks!
=
=Stephen,
=Sounds like your setup doesn't properly handle the CD (carrier detect)
=signal.
=
= [[advise on how to get it working.]]
=
=If that doesn't help either, you're probably using bad cables that have short-
=circuited the CD line (yes, you can really buy such cables!).

One more thing you forgot.  If he's using an ALM-1, the DCD and DSR pins are
reversed (sounds idiotic, but it's true).  You'll have to build a special
cable.
-- 
Larry Blair   ames!vsi1!lmb   lmb@vicom.com