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000383_news@columbia.edu_Tue Nov 14 14:07:57 1995.msg
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(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun>); Tue, 14 Nov 1995 09:08:00 -0500
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Flow control xon/xoff <-> RTS/CTS?
Date: 14 Nov 1995 14:07:57 GMT
Organization: Columbia University
Lines: 28
Message-Id: <48a7rt$rtg@apakabar.cc.columbia.edu>
References: <488ih7$jsg@pheidippides.axion.bt.co.uk>
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In article <488ih7$jsg@pheidippides.axion.bt.co.uk>,
Steve Fosdick <stevef@aom.bt.co.uk> wrote:
: We have a modem link, using modems with NMP5 which therefore implement
: flow control between the modem and the computer.
:
: At one end, the flow control mechanism is RTS/CTS and at the other end
: the flow control mechanism is Xon/Xoff.
:
: With this setup, file transfers sometimes get hung, and whenever this
: occurs, if I ^C from the file transfer, connected to the other end,
: and send an XON character I get a large number of queued packets in
: response.
:
: Never having had this problem when using Xon/Xoff at both ends I
: assume that kermit includes sending an Xon to the modem as part of
: it's timeout recovery mechanism in case the modem received an Xoff
: which kermit didn't send it, but doesn't do that if flow is set to
: RTS/CTS.
:
: Question: is there any detrimental effect to be had from trying the
: Xon heuristic in RTS/CTS mode?
:
Obviously, yes. Flow control should be operational locally between
each pair of devices that are capable of it. So RTS/CTS between the
PC and the modem, MNP5 between the two modems, and RTS/CTS *or*
Xon/Xoff between the remote modem and the remote computer.
- Frank