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000184_news@columbia.edu_Mon Jan 16 19:41:54 1995.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.tcp-ip,comp.protocols.kermit.misc
Subject: Re: xyz-modem through tcp-ip
Date: 16 Jan 1995 19:41:54 GMT
Organization: Columbia University
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In article <3feaq7$4aa@news.doit.wisc.edu>,
Jong-Min Park <jong-min@cae.wisc.edu> wrote:
>I am having trouble sending/receiving files using x/y/z-modem transfer
>on tcp-ip. Here is my setup:
> kermit to connect to a tcp-ip host
> use sz/rz to send/receive files
>
>The remote host doesn't have ftp, but allows kermit and x/y/z-modem
>transfer. Kermit transfer is too slow (45 cps) on the tcp-ip.
>
You have observed that Kermit works, but it is slow, whereas x/y/z-modem
do not work. You conclude that if x/y/z-modem could be somehow taught
to work, they would be fast, while Kermit would remain slow.
Kermit can be as fast as or faster than any of the other protocols when
tuned for speed. This is explained at length in the appropriate manuals
("Using MS-DOS Kermit", "Using C-Kermit", etc), and in our new FAQ, which
you can find at:
ftp://kermit.columbia.edu/kermit/FAQ.TXT
Kermit's defaults are deliberately conservative to maximize the chance
that it will work on any given connection, even if it works slowly, as you
have seen.
The defaults of X/Y/Z-modem, on the other hand, are set for speed at the
expense of robustness, as you have also seen.
I'd recommend you spend a couple minutes reading up on how to make Kermit
transfers go fast.
- Frank