Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!tcdcs!dce.ie!ch
From: ch@dce.ie (Charles Bryant)
Newsgroups: comp.dcom.modems
Subject: Re: Flow control in modems
Message-ID: <1991Feb4.121541.4842@dce.ie>
Date: 4 Feb 91 12:15:41 GMT
References: <1991Feb2.173201.24760@PacBell.COM> <3765.27aaf09a@hayes.uucp>
Organization: Datacode Communications Ltd, Dublin, Ireland
Lines: 17

In article <3765.27aaf09a@hayes.uucp> tnixon@hayes.uucp writes:
>All modems I'm aware of that support RTS/CTS flow control support it 
>in both directions -- the modem can drop CTS to tell the DTE to 
>suspend sending data to the modem, and the DTE can drop RTS to tell 
>the modem to suspend sending data to the DTE.

As far as I am aware that is true for new modems, but the original
software in the Quattro (an Octocom/Steebeck/Dowty modem popular in the
UK) used CTS but not RTS for flow control. That was the revision before
MNP (it had some other error correction scheme). It is obviously
essential that CTS is available for flow control when error correction
is used, but RTS is only for the convenience of the DTE (though I would
consider it important).
-- 
Charles Bryant (ch@dce.ie)
--
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