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000379_news@columbia.edu_Fri Feb 3 00:32:31 1995.msg
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(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Thu, 2 Feb 1995 19:32:41 -0500
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: CMS Kermit
Date: 3 Feb 1995 00:32:31 GMT
Organization: Columbia University
Lines: 28
Message-Id: <3grtiv$51p@apakabar.cc.columbia.edu>
References: <17337A963.1CMC3466@ibm.mtsac.edu>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <17337A963.1CMC3466@ibm.mtsac.edu>,
Curtiss Cicco <1CMC3466@ibm.mtsac.edu> wrote:
>Are there any hardware or software limitations that would
>cause an average receive packet-size of 1915 bytes when it is set
>at 9024? That is from CMS kermit to MSK 3.14
>
Yes.
The packet length is determined as follows:
1. The file receiver tells the file sender the longest packet it
is prepared to receive. There is a default, and then there is
a command to let the user change the default. The default is
normally 94, and the command is normally "set receive
packet-length".
2. The file sender has a maximum size that it can send. The size
that is actually used by the sender is the smaller of its own
maximum and the declared maximum of the receiver.
In the case of IBM mainframe Kermit, the maximum length it can send
generally depends on the communication method. If it is going through
a 3270 protocol converter such as a Series/1 or 7171, the maximum length
packet is somewhere around the 3270 screen size, e.g. 24 x 80 = 1920,
give or take a few bytes. This is a limitation of the 3270 emulation
box and/or software, and has nothing to do with Kermit.
- Frank