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From: jeff@drexel.UUCP (Jeff White)
Newsgroups: comp.mail.uucp,comp.dcom.modems
Subject: Need help using Microcom 9624 (9600 baud MNP) with uucp
Message-ID: <569@drexel.UUCP>
Date: 25 Mar 88 05:07:29 GMT
Organization: Drexel University, Phila., Pa.
Lines: 31
Keywords: uucp Microcom 9624 modems


   Does anyone know if there are problems in using Microcom 9624 modems
with uucp?  I have a pair of them that I am trying to use to link two Sun
computers (one a 3/50, the other a 3/160).  Both are running SunOS 3.4 with
the 4.3 version of uucp.  Here is the scenario.
   I can get uucp to dial out of the modems (or call into the other Microcom
modem with an ordinary modem) and get uucp to successfully make a connection
(ie. protocol handshaking).  If there are no files to send or receive,
uucp will terminate properly.  However, if there is any type of data to send/
be sent, I consistently get bad header errors, followed by pkget alarms, until
uucp just time out.
   It appears as if the problem is directly related to the Microcom modems.
For the one modem I have locally, regardless what the local serial port baudrate
is, or the actual modem connection (ie. with the microcoms, you can have
a 1200 baud modem connection running at 9600 baud between the computer and
modem, and vice-versa), the problem persists.  I am not using any flow control
on either the serial port or the modem to modem connection.  I have tried this
modem on both a Sun and a Vax, trying to call many different systems, all with 
the same results.  The same type of errors appear when trying to call into
one of the modems as well, again independent of the type of calling modem
(ie. our hayes 1200 talks to the remote systems USRobotics 2400 baud modem 
with no problem, but gets the bad header/packets when trying to connect
through the Microcom).
  Since I can safely say that the problem does not lie in the phone lines,
computers, uucp code, or baud rate (since I've run uucp at 9600 baud before),
the only thing left (and common) is the modems.  I would greatly appreciate
any help that you could provide.

						Jeff White
						Drexel University - ECE Dept.
						rutgers!bpa!drexel!jeff