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From: jc@sdcsvax.UUCP (John Cornelius)
Newsgroups: net.dcom,net.micro
Subject: Re: US Robotics Courier 2400 problems?
Message-ID: <1971@sdcsvax.UUCP>
Date: Fri, 8-Aug-86 09:22:24 EDT
Article-I.D.: sdcsvax.1971
Posted: Fri Aug  8 09:22:24 1986
Date-Received: Sat, 9-Aug-86 11:11:06 EDT
References: <195@dione.rice.EDU> <1329@ncoast.UUCP>
Reply-To: jc@sdcsvax.UUCP (John Cornelius)
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Organization: Consultant, San Diego
Lines: 20
Keywords: Courier, Modems, 2400
Xref: watmath net.dcom:2074 net.micro:15305

I've seen several articles kvetching on 2400 baud modem performance in the past
several weeks.  I think the definitive article on the subject was submitted by
Brian Kantor about 2 months ago to net.dcom.  The fundamental problem is that
many of the modems are not V.22 BIS compatible.  Brian pointed out at that time
that the US Robotics was not V.22 BIS.  Historically US Robotics has not been
very heavy on the engineering side of the business.  On the other hand they do
build inexpensive modems.  Actually, my biggest beef with USR is the way they
do business, although I'm not fond of their product either.

For the past year or so I have been under the impression that V.22 BIS modems
which were advertised for sale were mostly junk, including the Hayes and one
that the company I used to work for sold.  That has recently begun to change.
The units that UCSD has selected were made by Intertec and they seem to have
success with them.  In addition the Racal Vadic modems meet the spec, not that
one would expect anything else from Racal Vadic.  The new model Anchor
Lightning modems are also in spec and work rather well.  I believe that all of
these modems can be had with MNP error correction.

John Cornelius
jc@sdcsvax