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From: casey@gauss.llnl.gov (Casey Leedom)
Newsgroups: comp.dcom.modems
Subject: Re: 19200 bidirectional extension to V.32 bis.
Message-ID: <69515@lll-winken.LLNL.GOV>
Date: 10 Oct 90 00:49:15 GMT
References: <1990Oct7.221627.12252@larouch.uucp> <69427@lll-winken.LLNL.GOV> <1895@hayes.uucp>
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Reply-To: casey@gauss.llnl.gov (Casey Leedom)
Organization: Lawrence Livermore National Laboratory
Lines: 32

/ From: jparnas@Larouch Headquarters.UUCP (Jacob Parnas)
| 
| I heard that there is a proposal for a extension to V.32bis that will
| have throughputs of 19200 baud without compression and up to 76800 with
\ compression.  Does anyone have any more information about this proposal?

/ From: casey@gauss.llnl.gov (Casey Leedom)
| 
\ To be honest I doubt that your information is correct...

/ From: tnixon@hayes.uucp (Toby Nixon)
| 
| Jacob is, in fact, correct -- CCITT Study Group XVII has initiated a
| project to define the "ultimate modem" -- one that will operate full
| duplex on dial-up telephone lines at rates exceeding 14,400bps.  The
| proposals so far call for operation at 19,200 or above, with some of the
\ proposals talking about 24,000bps -- and this is WITHOUT COMPRESSION ...

  Jeeze, and I thought we were having a hard time now finding serial
interfaces that could go fast enough.  I have a feeling we're going to
have to go with EIA-422.  (Or is that EIA-423?  What's the one with two
wires for transmit and two for receive and uses differential voltage
swings to determine 0/1?  If I remember right it can go up to several
hundred Kbps ...)

  But seriously, there are some serial devices which don't even go up as
high as 38.4Kbps and I personally haven't seen higher rates used on
EIA-232.  Even V.32bis/V.42bis is going to feel choked with 38.4Kbps
under some conditions.  I sure CCITT is considering standardizing a modem
interface at the same time ...

Casey