Path: utzoo!utgpu!watserv1!maytag!xenitec!zswamp!root
From: root@zswamp.fidonet.org (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: V32bis
Message-ID: <6596.27880099@zswamp.fidonet.org>
Date: Sun, 06 Jan 91 16:16:09 EST
Organization: Izot's Swamp BBS - Kitchener, Ontario

 >From: tnixon@hayes.uucp

 >V.32 and V.32bis use Quadrature Amplitude Modulation.

   Is it still kosher to refer to them as QAM, even when the coding
constellation (is that the proper term?) is more complex than the
one described in V.22bis?  I was under the impression that QAM was
so called because amplitude was used to differentiate between the
two possible shifts at the 90 degree angles, while the other angles
represented only one bit pair each and did not require aimplitude
for differentiation.

   Anyway, thanks for the tech stuff on V.32, V.32bis, and their 'flavours'.
 

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