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000158_news@columbia.edu _Fri Jan 31 12:20:17 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Strange kermit problem
Date: 31 Jan 1997 17:20:14 GMT
Organization: Columbia University
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References: <32EBDA56.14F@rt66.com> <32F13F3E.4017@psyche.demon.co.uk> <5cqnb6$7gh$1@apakabar.cc.columbia.edu> <854710576.4625@dejanews.com>
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In article <854710576.4625@dejanews.com>, <peter@psyche.demon.co.uk> wrote:
: In article <5cqnb6$7gh$1@apakabar.cc.columbia.edu>,
: fdc@watsun.cc.columbia.edu (Frank da Cruz) wrote:
: >
: > In article <32F13F3E.4017@psyche.demon.co.uk>,
: > Peter Brooks <peter@psyche.demon.co.uk> wrote:
: > : I have been having a peculiar problem using kermit in reflections from
: > : my HP Omnibook to a UNIX box through a null modem cable. I can receive
: > : files from the HP-UX box without any problems, and very quickly. When I
: > : try to send files from the PC (setting the unix kermit session to
: > : RECEIVE) it fails, seemingly whatever configuration changes I make.
: > : It doesn't seem to be able to set up the link, it retries a number of
: > : times, but then gives up.
: > :
: > What is an HP Omnibook? What does it use for a Kermit program?
: > What kind of flow control are you using? If the Omnibook is not using
: > any kind of flow control, that would explain why it can send files
: > but not receive them. See if you can set up a common method of flow
: > control between the two ends -- RTS/CTS (preferably) or Xon/Xoff.
: >
: > If the Omnibook does not support any kind of flow control, try using
: > shorter packets, smaller window sizes, etc.
: >
: The Omnibook is a portable PC mine runs windows 3.1 at the moment. I have
: been using Reflection 1 for windows revision 4.21. I have set Xon/Xoff
: flow control.
:
: The problem is that I can receive files on the Omnibook, from the HP-UX
: box, but can't send them back.
:
I can only repeat my previous speculations and advice. It is evidently a
lack of adequate flow control in the to-Omnibook direction. The cause is
unclear -- it could be anything from buggy Windows virtual comm drivers to
a sluggishness deriving from Windows itself. In any case, use RTS/CTS flow
control if it as available -- it does not have the latency problems that
Xon/Xoff does.
Meanwhile if anybody else has an Omnibook and can comment from first-hand
knowledge, please chime in.