Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu!csquared
From: csquared@ccwf.cc.utexas.edu (Randy Clarke)
Newsgroups: comp.dcom.modems
Subject: Hardware flow control and Compression
Keywords: compression, flow control, v.42bis
Message-ID: <49273@ut-emx.uucp>
Date: 20 May 91 19:11:19 GMT
Sender: news@ut-emx.uucp
Reply-To: csquared@ccwf.cc.utexas.edu (Randy Clarke)
Organization: The University of Texas at Austin
Lines: 21
Originator: csquared@minnie.cc.utexas.edu

(A humble request to the net.modem.gurus)

     We're currently trying to set up some v.42bis modems on our Xyplex
terminal server at work.  The problem we've run into is this:  Apparently,
compression only works if RTS/CTS flow control is available.  As it stands
now, the Xyplex does not support this form of flow control (No pin outs
on the RJ-45 connector).   My question is this:  Why doesn't compression
work with standard XON/XOFF software control?  From what I've read, it
has something to do with setting up a sychronous connection between the
two modems.  Could someone please explain what kind of handshaking takes
place to make hardware flow control necessary or at least point me to
a FAQ file which explains v.42bis compression in some detail.
 

     Thanks,
       Randal C. Clarke

       Zycor/Landmark Inc.              rcc@zycor.lgc.com 
       220 Foremost Dr                  clarker@cs.utexas.edu
       Austin, TX 78745                 csquared@cc.utexas.edu
       Phone: (512) 282-6699