home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
kermit.columbia.edu
/
kermit.columbia.edu.tar
/
kermit.columbia.edu
/
newsgroups
/
misc.19950929-19951130
/
000373_news@columbia.edu_Mon Nov 13 22:57:43 1995.msg
< prev
next >
Wrap
Internet Message Format
|
1995-12-25
|
2KB
Received: from apakabar.cc.columbia.edu by watsun.cc.columbia.edu with SMTP id AA14087
(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun>); Mon, 13 Nov 1995 20:51:28 -0500
Received: (from news@localhost) by apakabar.cc.columbia.edu (8.6.12/8.6.12) id UAA28430 for kermit.misc@watsun; Mon, 13 Nov 1995 20:51:26 -0500
Path: news.columbia.edu!sol.ctr.columbia.edu!news.uoregon.edu!newsxfer.itd.umich.edu!news.mathworks.com!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!bt!theseus.aom.bt.co.uk!stevef
From: stevef@aom.bt.co.uk (Steve Fosdick)
Newsgroups: comp.protocols.kermit.misc
Subject: Flow control xon/xoff <-> RTS/CTS?
Date: 13 Nov 1995 22:57:43 GMT
Organization: BT Labs, Martlesham Heath, Ipswich, UK
Lines: 25
Message-Id: <488ih7$jsg@pheidippides.axion.bt.co.uk>
Nntp-Posting-Host: theseus.aom.bt.co.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-Newsreader: TIN [version 1.2 PL2]
Apparently-To: kermit.misc@watsun.cc.columbia.edu
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?
--
Steve Fosdick Internet: stevef@aom.bt.co.uk
Voice: +44 1473 642987 BT WEB: FOSDICK S J
Fax: +44 1473 644607 BOAT: FOSDICSJ
Snail: Room 210, B67, BT Labs, Martlesham Heath, Ipswich, IP5 7RE, England.