Path: utzoo!attcan!uunet!unisoft!hoptoad!hsfmsh!daemon
From: tnixon@hsfmsh.UUCP (Toby Nixon)
Newsgroups: comp.dcom.modems
Subject: Re: Searching for inexpensive V.32 9600 bps modems (was cheap telebits)
Message-ID: <2829@hsfmsh.UUCP>
Date: 12 Apr 90 21:32:37 GMT
Sender: daemon@hsfmsh.UUCP
Organization: Hayes Microcomputer Products, Inc.  Norcross, Georgia
Lines: 32

In article <511474@nstar.UUCP>, larry@nstar.UUCP (Larry Snyder) 
writes:

- > Could you please explain why V.32 is becoming obsolete? What is going
- > to replace it?
-
- how about v.42bis?

V.42 bis is not a modulation scheme.  It is a data compression 
scheme only, used with V.42 LAPM error control.  V.42 can be used
with any full duplex synchronous modulation scheme, such as V.22,
V.22 bis, V.26 ter, or V.32.  V.32 bis, when it is finalized, will
also support V.42 (and therefore V.42 bis). 

I don't think that V.32 bis is going to obsolete V.32.  The draft
V.32 bis recommendation requires backward compatibility with V.32, 
but adds 7200, 12000, and 14400 bps rates (full duplex, not 
half-duplex or asymmetrical like the HST or DAMQAM).  It will take a 
year or two for V.32 bis modems to come on the market, and they will 
initially be somewhat more expensive than existing V.32 modems, but 
eventually the "modem of choice" will be a V.32 bis/V.42 bis modem.

  	-- Toby

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Toby Nixon, Principal Engineer     Fax:    +1-404-441-1213  Telex: 6502670805
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