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From: admiral@admiral.UUCP (Doug Fields)
Newsgroups: alt.bbs.waffle,comp.dcom.modems
Subject: Re: Why HST's and UUCP don't mix (was Re: uucico and HST)
Message-ID: <mwk422w164w@admiral.UUCP>
Date: 17 May 91 15:29:57 GMT
References: <8TXZ25w164w@graphics.rent.com>
Sender: waffle@admiral.uucp (Waffle BBS User Login)
Reply-To: admiral@admiral.UUCP (Doug Fields)
Organization: The Grid/Waffle BBS, 203-661-2873, -1279, -0450, -2967
Lines: 27

bobl@graphics.rent.com (Bob Lindabury - SysAdm) writes:

> file.  If a V.42bis modem connects to a MNP5 (remember, we are only
> talking compression schemes here) then the V.42bis modem *can* (some
> manufacturers didn't build in a fallback to an MNP5-like
> compression scheme) fallback to MNP5-type compression.  My Hayes

Not quite. While V.42 does include MNP1-4, V.42bis does NOT include MNP5. 
It is usually an additional feature of V.42bis modems to include MNP5 but 
that is NOT part of the V.42bis spec from the CCITT.

> compression savings on the mail files.  As for the news, I don't
> believe you will lose much if anything using a V.32 modem with
> V.42bis compression enabled.  I haven't tested out the actual cps
> rates in different modes because I haven't felt that it was worth the
> time and effort since I am getting reasonable rates as it is.

You will not get a slowdown... This is from a test with two V.42bis HST's 
using Zmodem with V.42bis on and off on a .Zipped file. The modem will 
keep on chugging at around 1650 cps either way. With the standard unix 
compress, which uses almost the exact same algorithm, it would be close 
to impossible to get any further compression.

Doug Fields -- 100 Midwood Road, Greenwich, CT 06830 --- (FAX) +1 203 661 2996
uucp: uunet!sir-alan!admiral!doug --- Thank you sir-alan/mail and wizkid/news!
Internet: fields-doug@cs.yale.edu --------------- (Voice@Yale) +1 203 436 0184
BBS: (HST/V32) +1 203 661 1279; (MNP6) -2967; (PEP/V32) -2873; (V32/V42) -0450