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000243_news@columbia.edu_Mon Oct 30 14:43:14 1995.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Maximum transfer speed
Date: 30 Oct 1995 14:43:14 GMT
Organization: Columbia University
Lines: 44
Message-Id: <472oa2$12n@apakabar.cc.columbia.edu>
References: <Pine.HPP.3.91.951029001618.14977A-100000@bluejay.creighton.edu>
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In article <Pine.HPP.3.91.951029001618.14977A-100000@bluejay.creighton.edu>,
Psychos 'R Us <honge@creighton.edu> wrote:
>This may have asked numerous times but I need the info pretty bad.
>
>I'm trying to download Big Files from a HP server. The Y-modem-G was not
>robust enough, and Z-modem has some problem working out. Basically the
>I'm logging into the HP server as a dumb terminal. Both the HP-UX kermit
>and the OS/2 kermit (on my end) are 5A(191). But for some reason, I
>cannot break through the 1041cps barrier. Using the Y-modem-G, the
>maximum transfer is at 1681cps. The modems (a Hayes Accura 14.4 and a
>Cardinal 14.4) operate at 14.4bps. On the average, I get one transfer
>error every 10 minutes (that's mathmatical average -- the real stuff is
>quite random but the phone noise is there).
>
>On the HP-UX end, the only thing I do is "kermit -i -x." On the OS/2 end,
>I have set packet size to 2048, window slots to 24, and everything else
>is as-is.
>
>Is there any other things I can/should do? I tried to use MS-Kermit
>(MS-DOS version). On that one, I couldn't even raise the packet length
>beyond 371! Oh well...
>
There is no such limit in MS-DOS Kermit -- probably this was an artifact
of C-Kermit's buffer size divided by its window size. Just increase the
buffer size appropriately before selecting the window and packet sizes.
You can read all about this in the documentation.
In general, any speed that can be achieved with Zmodem can also be
achieved with Kermit on the same connection. Zmodem defaults are tuned
for maximum speed; Kermit's are tuned for robustness. If Zmodem fails,
you can change its defaults to add robustness features -- escaping,
windowing, etc -- and if Kermit is too slow you can crank up its packet
length and window size, and you can tell it not to escape any set of
control characters. ZIP-file transfer speeds well in excess of 1600 bps
are routinely achieved on the exact type of connection you have, using
C-Kermit 5A(191) on OS/2 and C-Kermit 5A(190) on HP-UX -- if you have an
older version on HP-UX then you should install the current one.
Lots more info on this subject in our FAQ:
ftp://kermit.columbia.edu/kermit/faq.txt
http://www.columbia.edu/kermit/faq.html
- Frank