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From: karl@sugar.hackercorp.com (Karl Lehenbauer)
Newsgroups: comp.mail.uucp
Subject: V.32 vs. PEP for lots of small uucp transfers
Message-ID: <6937@sugar.hackercorp.com>
Date: 31 Oct 90 03:48:29 GMT
Reply-To: karl@sugar.hackercorp.com (Karl Lehenbauer)
Organization: Sugar Land Unix - Houston
Lines: 17

If you have the choice of connecting to a machine via PEP or V.32, as in
the case where both sides have Telebit T2500 modems (and UUNET uses them)
and you do a great deal of traffic in small files, like lots of small
email files, I have found that V.32 achieves significantly greater throughput
than PEP.

The reason is (almost certainly) that the half-duplex PEP protocol takes
longer to turn the line around back and forth for the short messages that
uucp exchanges to negotiate a transfer, plus the short command file that
accompanies each transfer, than does the full-duplex V.32.  The uucp protocol
spoofing in the modems doesn't help during this part since it doesn't spoof
that part of the exchange (and you wouldn't want it to -- you don't want your
modem acking file transfers that the modem hasn't yet and might not be able to
get successfully pushed through to your computer.)
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