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From: root@zswamp.uucp (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: Summary of 9600 V.32 bis modem info
Message-ID: <147.28486D85@zswamp.uucp>
Date: 2 Jun 91 00:25:22 GMT
Article-I.D.: zswamp.147.28486D85
Organization: Izot's Swamp BBS (FidoNet), Kitchener, Ontario
Lines: 26

In a letter to All, Tim Endres (time@ice.com ) wrote:

 >Remember that V.32 (from what I remember) does not need the 
 >framing bits that 2400 baud uses, giving something on the
 >order of a 20% increase in real throughput.
 >If someone knows the details about this, please post.

   It has nothing to do with the nature of V.32; V.22bis (2400 bps) doesn't 
need the framing bits any more than V.32 does, but they're left in there 
because the asynchronous protocol between the computers and their respective 
modems requires it.

   More sophisticated modems, with error-correcting protocols, have the 
internal intelligence and computing power to make whatever adjustments are 
necessary to take advantage of the fact that 20% of the data coming in the 
modem's RS-232 port is completely redundant.

   If someone could be bothered to impliment MNP3 and 4 on a Bell 103J modem, 
I'm sure that you could get the same relative speed boost at 300 bps.
 

--  
Geoffrey Welsh - Operator, Izot's Swamp BBS (FidoNet 1:221/171)
root@zswamp.uucp or ..uunet!watmath!xenitec!zswamp!root
602-66 Mooregate Crescent, Kitchener, ON, N2M 5E6 Canada (519)741-9553
"He who claims to know everything can't possibly know much" -me