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From: authorplaceholder@tiger.UUCP.UUCP
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet Compatibility...
Message-ID: <144000002@tiger.UUCP>
Date: Sun, 8-Feb-87 04:03:00 EST
Article-I.D.: tiger.144000002
Posted: Sun Feb  8 04:03:00 1987
Date-Received: Tue, 10-Feb-87 03:02:30 EST
References: <4312@columbia.UUCP>
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Nf-From: tiger.UUCP!rvk    Feb  8 03:03:00 1987


/* Written  2:41 pm  Feb  5, 1987 by desimone@tom.columbia.edu.UUCP in tiger.UUCP:comp.dcom.lans */
/* ---------- "Ethernet Compatibility..." ---------- */

Hi...We've been successfully running an ethernet LAN here for the past
	couple of years.  Recently, however, we've received a number
	of products that conform to the IEEE 802.3 standard.  Since
	our network is a few years old, some of our hardware was
	designed according to the original ethernet standard (Version 1)
	and some according to Version 2.  I haven't really been able to
	get solid information about compatibility problems between
	these standards.  I'd like to know what the main differences
	are between the three standards and what the compatibility
	picture looks like.  Thanks...



... Salvatore
/* End of text from tiger.UUCP:comp.dcom.lans */
I'd like to give you a couple of hearsay incompatibilities.  I read in
DATA COMMUNICATIONS magazine that ethernet 1.0's voltage level at 
"idle" on the baseband cable is 0.7 Volts DC, whereas IEEE 802.3's 
idle voltage leve is 0.0.  I had an Entre salesman (take this with a
grain of salt) tell that some ethernet boards incorrectly interpret
an IEEE 802.3 "length" field as a "type" field.  I have not been able to
determine the accuracy of the latter statement.

Ray Kellogg