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From: haque@umn-cs.UUCP
Newsgroups: comp.dcom.modems
Subject: bridge vs modems
Message-ID: <83700001@umn-cs.UUCP>
Date: Wed, 11-Mar-87 05:25:00 EST
Article-I.D.: umn-cs.83700001
Posted: Wed Mar 11 05:25:00 1987
Date-Received: Fri, 13-Mar-87 00:01:35 EST
Lines: 49
Nf-ID: #N:umn-cs:83700001:000:2120
Nf-From: umn-cs!haque    Mar 11 04:25:00 1987



greetings fellow netlanders.. :-)

I have a set up of two Bridge CS/100T's acting as entrylevel gateways
for our local area network of TCP/IP machines. We are currently
running an estimated 30 sun workstations, a Vax 11/780, a DG MV/10000
IBM PC network , HP Unix machines and such..

The problem I have currently lies with our dial-in facilities with
these particular bridge boxes. 

	Actually I should mention that our University (of Minnesota, MPLS) 
recently switched over to a super-duper phone system [all electronic and 
computerized state of the art] using IBX equipment. We have been
having problems with the system, but not in any consistent manor.

So, what our bridges have hooked up to them are BIZCOMP modem, these
are *intelligent* Hayes compatible modems. Now, when you dial in to
these modems, at 300/1200 you can get connected over 80% of the time.
But during the other 20 %, the modem is usually *off the hook*

This behaviour is puzzling. Suddenly without apparent warning, the
modems seem to get a signal from the bridge saying, "get ready for
command input, take phone line off the hook, and stay until told so"

The bridges do have a sort of crude getty running on them, so there is
a transfer of characters toward the modem, but what would make the
BIZCOMP modem, upon receipt of the "CS/100T_1>" prompt , go into input
mode, beats me.

For those of you who have dial in bridges, how and what setup are you
using?? Please, Please give me some information on what the bridge
boxes like or not.. Dis is driving me nuts.. since the only method to
correct is actually disconnecting the rs 232 link and power cycling
the modem.
 Also, are you thinking of providing services for 300/1200/?2400?
users, since the price of 2400 modems is getting affordable. So far as
I can see, the bridge boxes can only handle 300/1200 or
1200/2400/4800/9600. :-(

By the way, the bridge software I am running is ver 13002 of the
TCP/IP code.
				Thanks a lot.
				Samudra Haque
				Computer Science Systems Group
				University of Minnesota, Minneapolis
				(612) 625 0876
				haque@umn-cs.ARPA or haque@umn-cs.UUCP