Path: utzoo!attcan!uunet!seismo!dimacs.rutgers.edu!bcm!rice!Taffy.rice.edu!jack
From: jack@Taffy.rice.edu (Jack W. Howarth)
Newsgroups: comp.sys.mac.comm
Subject: Re: $199 v.42 modem????
Message-ID: <1990Nov6.013747.15282@rice.edu>
Date: 6 Nov 90 01:37:47 GMT
References: <1990Nov2.043710.16493@rice.edu> <5033@oak10.UUCP>
Sender: news@rice.edu (News)
Organization: Rice University
Lines: 16


   William,
       I assume that a 9600 baud v32/v42/v42-bis will drop down to 
v22bis/v42/v42bis. The mechanism of tone generation (v22bis) should be
independent of the method of error correction (v42) and data compression
(v42-bis). Since I have yet to run into a v.32/v42/v42-bis modem so
far I can't say for certain. 
       As to whether you should buy one, if you only have a 2400 modem
w/o MNP, go for it. You'll get MNP1-5 and v42/v42bis plus a Rockwell
modem chip set (i.e. quality) for $50 more than a bare bones 2400 MNP
modem.  If you have a 2400 MNP modem is probably not worth it. v42-bis
will give you a 4:1 compression of data compared to 2:1 for MNP5 (MNP9
does 4:1 as well but is very rare), however, few modem now have v42bis
so you'll be using MNP most times. So if you don't have any error
correction most definitely go for it, otherwise no.
                               Jack