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Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!ecsvax!taylor
From: taylor@ecsvax.UUCP (Steven Taylor)
Newsgroups: net.dcom,net.periphs
Subject: Re: Definition of "null modem" cable
Message-ID: <342@ecsvax.UUCP>
Date: Fri, 30-Aug-85 10:44:49 EDT
Article-I.D.: ecsvax.342
Posted: Fri Aug 30 10:44:49 1985
Date-Received: Sat, 31-Aug-85 21:46:07 EDT
References: <195@almsa-1> <156@cdstar.UUCP>
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Organization: North Carolina Educational Computing Service
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Xref: watmath net.dcom:1233 net.periphs:838



The main difference between a "null modem cable" and a "modem 
eliminator" in common usage of the terms is that a "modem
eliminator" OFTEN also has the capability to provide a clock 
signal on pins 15 and 17.  This is commonly used to connect
two synchronous devices which require external clock (which would
normally be supplied by the modem, hence the "eliminator.")

Steven Taylor
Distributed Networking Associates
119 Doncaster Lane
Charlottesville, VA  22901
(804) 979-0656