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From: zjdg11@hou.amoco.com (Jim Graham)
Newsgroups: comp.dcom.modems
Subject: V.42/V.42bis vs. MNP4/MNP5 (WAS Re: V.42 questions on T2500 -- How?)
Message-ID: <1991Jun24.175643.7733@hou.amoco.com>
Date: 24 Jun 91 17:56:43 GMT
Article-I.D.: hou.1991Jun24.175643.7733
References: <1991Jun17.225901.10900@coplex.uucp> <1991Jun18.123604.9315@hou.amoco.com> <78@uis-oc.UUCP>
Sender: news@hou.amoco.com
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In article <78@uis-oc.UUCP> bob@uis-oc.UUCP (Robert J. Mathias Jr.) writes:
> In article <1991Jun18.123604.9315@hou.amoco.com> zjdg11@hou.amoco.com 
> (Jim Graham) writes:

>> I'll take V.42/V.42bis over MNP4/5 any day.....

> Some of us like to squeeze the last ounce of speed out of our equiptment

like me, for example....very definitely.  when I'm at home, I pay for just
about every call, including local calls, on a per-minute basis.  also, I
don't have a lot of patience to sit and wait on a slow modem (virtually nil,
in fact).  Add those up, and look at my last month's phone bills, and even
the slightest improvement helps.

> so we poor miss guided souls prefer to disable V.42 and go with MNP4.
> As to V.42bis and MNP5, V.42bis is the winner but since I do alot of 
> file xfers of ZIPed files, I also disable compression on my modem.

Ok, we agree that V.42/V.42bis beats MNP4/MNP5 --- so why use MNP4/MNP5
if you have a choice?  with V.42bis turned on, I still see an increase in
throughput on Zmodem file transfers of ZIPped files (115 -- 125 percent
efficiency as opposed to 97 percent seems common), so how does turning if off
help?

So, what am I missing here?  I'm honestly curious as to why so many people
seem to talk about the evils of V.42bis on file xfers when I see such an
improvement....that is, btw, measured stats on BBSs and from DSZ.  (The stats
are somewhere in a big pile of paper at home....and probably got tossed in
this weekend's cleaning up, but if anyone is really interested, I could
easily take note of some more.)

   --jim

Standard disclaimer....These thoughts are strictly mine, not my employer's.

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