Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!ames!lll-winken!arisia!jellinek
From: jellinek@candymtn.PARC.xerox.com (Herb Jellinek)
Newsgroups: comp.dcom.modems
Subject: NCD X terminal speaking SLIP over Telebit T2500's: how?
Message-ID: <JELLINEK.89Sep8144132@candymtn.PARC.xerox.com>
Date: 8 Sep 89 21:41:32 GMT
Sender: news@arisia.Xerox.COM
Distribution: comp
Organization: Xerox PARC, Palo Alto, CA
Lines: 31

I'm trying to convince an NCD X terminal to speak SLIP over a pair of
Telebit T2500 modems to my Sun-4/330.  Substituting a null modem for
the modem pair works fine -- the terminal is just about usable at that
speed, and I can run X and telnet to my heart's content.

Alas, when I put the modems in the circuit, things start off
well enough, but deteriorate rapidly.  I can open a telnet session to
the Sun, but it often hangs just after log-in; output from the Sun no
longer echos in the telnet window, even though the HP protocol analyzer
I'm using shows that the Sun is busy sending me all sorts of data,
which the NCD is ignoring, as well as responding to my keystrokes.
Eventually the NCD seems to stop sending anything, and the connection
hangs.  At that point, I cannot even PING the Sun from the terminal successfully.

At times I've even been able to run X applications like Ico, but those
die within one or two minutes, running slower and slower until they stop.

I've got the Telebits configured for 19200 baud using PEP encoding.
I'd like to try them using MNP5 at 9600, but a little piece of paper
stuck into my Telebit manual says that that doesn't work yet.

Has anyone out there got any suggestions?  I'm not too familiar with
what's involved with using PEP, or how it might affect synchronization
of SLIP packets, but I suspect that that might have something to do
with it.  Ultimately, though, I'm clueless.

I'm running the beta release of Slip 4.0 from Toronto, by the way.
Thanks for your help.

		Herb Jellinek
		Jellinek@Xerox.com