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000220_news@columbia.edu_Mon Nov 21 17:31:42 1994.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Help: file transfer problem
Date: 21 Nov 1994 17:31:42 GMT
Organization: Columbia University
Lines: 32
Message-Id: <3aqlhu$7q6@apakabar.cc.columbia.edu>
References: <CzMLA2.K01@liverpool.ac.uk>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <CzMLA2.K01@liverpool.ac.uk>,
Prof X. Chen <xchen@liverpool.ac.uk> wrote:
>I use MSKermit 3.13 for the communication between my PC and University
>Unix system. When I use it to transfer files, it is ok to download
>files to my PC in a reasonable speed. However, if I try to send files
>to the remote system, the speed becomes very very slow and often do
>not work at all.
>
This type of question is answered clearly and at length in the documentation.
Very briefly: There are five major items to be considered:
1. Interface speed -- use the highest possible speed, lock your modem
at that speed, and also enable its error-correction and data compression
features.
2. Flow control -- use the most effective possible means thereof, such as
RTS/CTS.
3. Use long packets. Tell the Kermit program which is *receiving* the file
to "set receive packet-length 2000" (or whatever other number works best).
4. Use sliding windows. Tell *both* Kermit programs to "set window 4"
(or other number).
5. Read about control-character unprefixing in the update notes files that
come with the current releases of C-Kermit and MS-DOS Kermit.
Items 1 and 2 are handled automatically by the dialing scripts for high-speed
modems that come with MS-DOS Kermit. Items 3-5 require some experimentation
to obtain the maximum transfer rate possible on any given connection.
- Frank