alvitar%madhat.UUCP@SEISMO.CSS.GOV (11/25/85)
We are considering the purchase of 2400 baud auto-dial modems for
several local sites. We are presently evaluating the Hayes 2400 and
the US Robotics Courier. The latter is especially attractive as it
has been advertised in Byte for $389. If you have evaluated these or
other 2400 baud modems, we would like to hear your opinions. If you
suggest another brand, please mention what command set is used by the
autodialer. Our uucico only knows about Hayes and Ventel command
sets. Please e-mail your response to the following address.
--
Live: Phil Harbison, DataVision
Mail: 3409 Grassfort Dr., Huntsville, AL 35805
Uucp: {ihnp4,clyde,sdcsvax}!akgua!madhat!alvitar
Bell: 205-881-4317gildea@EDDIE.MIT.EDU@mit-erl.UUCP (02/03/87)
We are about to purchase a new modem and would like to get one that can do 2400 baud. Of course, it also has to do 1200 and 300 and auto dial. Any recommendations or comments? Please reply to me directly; I'm not on the list anymore. Thanks. < Stephen
ROODE%BIONET@SUMEX-AIM.STANFORD.EDU.UUCP (02/08/87)
Both US Robotics Courier 2400E and Multitech CTS 2400-MNP modems seem to be available for around $435 at discounters. The MNP error correction is automatically disabled for interoperation with modems that do not have it. Can anyone see any disadvantage to modems that include this error correction? -------
jerry@oliveb.ATC.OLIVETTI.COM.UUCP (02/13/87)
Regarding disadvantages for MNP. I have had two problems with an MNP equipped modem (Vadic 2400 PA). The first is that it will NOT talk to Vadic 3467 modem unless I disable the MNP negotiation. I suspect this may relate somehow to the VA3400 protocol that the 3467 supports but never pinned down the exact cause. The second problem is the time required for the MNP negotiation. By the time the MNP modem has decided that the other modem does not have MNP and informed me of the fact, I have usually missed the prompt sent by the other system. Perhaps the real problem here is all that verbose output. There should be some way to turn it off. My UUCP software doesn't really care whether MNP was used on a particular connection. Are these problems common to other implementations of MNP? The main reason I got the Vadic 2400 PA is that it supports speed conversion. This makes the baudrate supported by the answering modem transparent to me, greatly simplifying automated connections.
SPGDCM%UCBCMSA.Berkeley.EDU@UCBVAX.BERKELEY.EDU.UUCP (02/13/87)
MSG:FROM: SPGDCM --UCBCMSA TO: NETWORK --NETWORK 02/12/87 18:40:03
To: NETWORK --NETWORK Network Address
From: Doug Mosher <SPGDCM at UCBCMSA>
Title: MVS/Tandem Systems Manager (415)642-5823
Office: Evans 257, Univ. of California, Berkeley, CA 94720
Subject: 2400 baud modems
To: Telecom@xx.lcs.mit.edu
We are starting to use 2400 baud modems here and prefer the error-correcting
protocol by a long shot. However there is a logical "deficiency" of sorts.
If a line got very bad with a regular modem you might see lots of error
characters and say "look here, a bad line/connection/modem". With the
correction going on, however, you'd see what might look like a degredation
in response time, up to perhaps very severe. This COULD result in incorrect
perceptions or conclusions about services or response time rather than
a realization about broken lines/modems.
Thanks, Doug
2400 baud modems