Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!ncar!husc6!bbn!aoa!mbr
From: mbr@aoa.UUCP (Mark Rosenthal)
Newsgroups: comp.dcom.modems
Subject: Problems with MNP on a MultiTech 224EH
Message-ID: <221@aoa.UUCP>
Date: 9 May 88 23:04:28 GMT
Reply-To: mbr@aoa.UUCP (Mark Rosenthal)
Organization: Adaptive Optics Assoc., Cambridge, Mass. USA
Lines: 18
References:


I have installed two MultiTech 224EH 2400 baud modems on our VAX 8650 running
Ultrix 2.0.  The processes which talk to the modems are either tip or uucico.
The modems are configured to talk at 4800 bps out the serial port, and use CTS
to tell the VAX to stop transmission temporarily when they are in danger of
overrunning the speed of the phone line.  The VAX software respects CTS (as
verified by watching the led's on a breakout box).  The modem is supposed to
negotiate speed (and possibly MNP level) with the remote modem.

Things seem to work fine in "normal" mode (i.e. with MNP turned off).  This
gets me 300, 1200, and 2400 bps.  The problem comes when I turn on "reliable"
mode (i.e. the modem does MNP level 4 error correction all the time) or
"auto-reliable" mode (i.e. the modem will do MNP level 4 error correction if
the remote modem can handle it).  With error correction turned on however, the
modems freeze up.

Has anybody else run into similar problems?  Any suggestions?
-- 
	Mark of the Valley of Roses
	...!{harvard,ima}!bbn!aoa!mbr