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From: mark@cbosgd.UUCP (Mark Horton)
Newsgroups: net.dcom
Subject: Penril woes
Message-ID: <1267@cbosgd.UUCP>
Date: Tue, 18-Jun-85 17:29:19 EDT
Article-I.D.: cbosgd.1267
Posted: Tue Jun 18 17:29:19 1985
Date-Received: Thu, 20-Jun-85 09:34:26 EDT
Organization: AT&T Bell Laboratories, Columbus, Oh
Lines: 32

We have gobs and gobs of Penril auto-dial 212 modems.
They've worked reasonably well on some old configurations (a Develcon
dataswtch and a DZ port) with some funny cabling, but we're just now
discovering a pair of misfeatures that are giving us fits.

We can't use the Penril as a dialup (e.g. 212 answer-only replacement)
because it asserts CD all the time.  (This isn't switch selectable.)
This causes UNIX to wake up the getty, which prints a banner.  The
banner contains a CR, which wakes up the penril, which greets the getty.
The two then carry on a little conversation, eating up CPU, repeatedly.
One trick is to set a switch and have RI wired to CD - it will leave RI
high during and after the ring.  (This is the funny cabling mentioned above.)
This worked on the DZ, but when we moved to a DH, we found out that RI
doesn't emulate CD perfectly.  RI goes up and down a few times before
coming up for good.  This drives our DH crazy, waking up the getty and
immediately blowing it away with SIGHUP.  We are also having this
problem on a Bridge CS/1.

We can mostly use them as a dial-out, but they have an annoying habit
that if I have just connected up (within a few seconds) and type lots of
stuff fast, ending in CR, the modem fails to print 10 chars worth of
output and instead prints the 3 chars "CR LF >".  This drives our UUCP
crazy on some hosts, since it types fast and sends CR.  Often it will
expect login, get it, send uucp, expect ssword, and get neither the echo
of uucp nor the ssword, just a >.

Does anybody have any advice?  Can you confirm that these problems
(especially the > one) are really in the Penril?  Is there a fix?  We
have about 24 of these modems in 3 racks, an investment we hate to lose
or replace.

	Mark