Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!rutgers!bobsbox!graphics!bobl
From: bobl@graphics.rent.com (Bob Lindabury - SysAdm)
Newsgroups: comp.sys.amiga.datacomm
Subject: Re: Is there a 9600 baud standard?
Message-ID: <HPwk26w164w@graphics.rent.com>
Date: 7 May 91 13:30:28 GMT
References: <1991May06.121434.25828@medar.com>
Organization: The Graphics BBS (2D,3D,GIF,Animation) +1 908/469-0049
Lines: 57

jseymour@medar.com (James Seymour) writes:

> >The standard in the entire industry and the world for 9600 bps modems
> >is V.32.  V.32bis will probably supercede V.32 in the next year.
> >V.32 gives you a 9600 baud carrier with compression giving you up to
> >4 times that speed in theory.  V.32bis will give you a 14,400 baud
> >carrier with the same 4 times increase (theoretically) with
> >compression.
> >
> 
> This is not correct.  v.32 is the CCITT standard for 9600bps modems, but
> does no compression, etc.  Any compression or error checking/correcting
> is performed by a protocol running "on top of" v.32.  The current CCITT
> standards for this are v.42 and v.42bis.  v.42 specifies error correcting
> protocol negotiation and v.42bis adds compression.  Where Bob is confused
> is that (at least as far as I have seen) all new 9600bps v.32 modems
> include v.42bis.  You can, for instance, run a modem at 2400bps and still
> use v.42bis to get the compression.

Again, I didn't meant to infer that compression came with V.32 or
V.32bis.  I was just stating that with different compression schemes,
you could get higher throughput rates.
 
> >Right now there are several V.32 modems being manufactured by the
> >likes of Intel and Practical Peripherals selling for around $400.00.
> >These will most likely come with upgrade policies to V.32bis.  I
> >picked up a Hayes Ultra V.32 and hope to upgrade to V.32bis soon.
> >
> 
> BEWARE!!!  v.32bis is sufficiently different from v.32 that upgrading a
> v.32 modem to v.32bis is by no means a given.  From what I've been
> reading, not all of the modem manufacturers are being real clear about
> this.

Actually, Hayes is being real clear about it.  They *will* be
offering an affordable upgrade solution to Ultra owners.
 
> If you really want the lowdown, I suggest some time spent in
> comp.dcom.modems.  If your site has been getting this in it's newsfeed,
> and the article has not yet been expired there, look for something
> entitled like "lexicon".  It is kind of a monthly FAQ posting on
> modem alphabet soup and explains all of this stuff in pretty good
> detail.  If you can't find it, let me know and I will mail it to you.
> I also wrote up my own standard answer to questions like this that is
> much more brief.  I would be happy to send it along as well.

Here here!  comp.dcom.modems is the place to get the goods on all
this stuff.

-- Bob

 The Graphics BBS  908/469-0049  "It's better than a sharp stick in the eye!"
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