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Path: utzoo!utcsrgv!mason
From: mason@utcsrgv.UUCP (Dave Mason)
Newsgroups: net.dcom
Subject: Re: In defense of XOFF/XON flow control
Message-ID: <2647@utcsrgv.UUCP>
Date: Mon, 7-Nov-83 15:06:26 EST
Article-I.D.: utcsrgv.2647
Posted: Mon Nov  7 15:06:26 1983
Date-Received: Thu, 10-Nov-83 16:32:54 EST
References: <257@decvax.UUCP>
Organization: CSRG, University of Toronto
Lines: 13

As a student assignment I had the class calculate the number of characters
required in a buffer for a 1 way sattelite, 1 way terrestrial link.
It only works out to <180 characters at 4800 baud.  This means a 1k buffer
that x-offs at 3/4 full will work up to 4800 via sattelite.  1/2 full will
work up to 9600.  (This assume interrupt handler recognition of X-OFF).

If you are going through any datacom gear at all, you will need a buffer;
All that handshake signals buy you (over X-OFF/X-ON) is 8 bytes (the UART
delays) which isn't going to make or break most designs.

 -- Dave Mason, U. Toronto CSRG,
        {cornell,watmath,ihnp4,floyd,allegra,utzoo,uw-beaver}!utcsrgv!mason
     or {decvax,linus,research}!utzoo!utcsrgv!mason   (UUCP)