NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/dcom/modems-part1/4796

Text File | 1996-08-05 | 1.6 KB | 35 lines

Newsgroups: comp.dcom.modems
Path: istar.net!infoshare!whome!herboid!geac!itcyyz!xrtll!bokonon!stephen
From: [e-mail] (Stephen M. Dunn)
Subject: Re: To V42Bis or not to V42Bis??
Organization: United System Solutions Inc.
Date: Wed, 7 Feb 1996 04:32:29 GMT
Message-ID: <[e-mail]>
References: <4ej6rh$[e-mail]>

In article <4ej6rh$[e-mail]> [e-mail] (Simon Hon) writes:
$    Should I have V42bis on or off?  I find that at 28.8 connections I get
$faster CPS rates with it off.  Does this make any sense?

   You should have it on in most cases.

   The actual connection rate between modems should not be affected
by it; the connection between modems is negotiated first, and then
error correction and data compression are negotiated afterwards.

   V.42 will improve throughput, as well as correcting errors, but
it will introduce some additional latency (delays).  Depending
on what you're doing, this may be an acceptable trade - or it may
have a substantial negative impact on performance.

   V.42bis, if it's implemented well, should never have a large
negative impact if we're comparing apples to apples here.  If,
on the other hand, you're comparing V.42bis+V.42 to neither at
all, then the difference you're seeing is probably due to
V.42, not to V.42bis.
--
[e-mail]               ...!{xrtll,gts.org}!bokonon!stephen
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Stephen M. Dunn, CNE, ACE, Sr. Systems Analyst, United System Solutions Inc.
104 Carnforth Road, Toronto, ON, Canada M4A 2K7          [phone] x251