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From: david@elroy.Jpl.Nasa.Gov (David Robinson)
Newsgroups: comp.protocols.tcp-ip
Subject: Ethernet versions
Message-ID: <4800@elroy.Jpl.Nasa.Gov>
Date: Mon, 9-Nov-87 01:05:18 EST
Article-I.D.: elroy.4800
Posted: Mon Nov  9 01:05:18 1987
Date-Received: Wed, 11-Nov-87 02:40:45 EST
Organization: Image Analysis Systems Grp, JPL
Lines: 21
Keywords: info?

As most people know their are a couple ethernet standards, Version 1,
Version 2 and IEEE 803.2.  When one installs a new ethernet board
they must have the correct transeiver level to match the type that
the board supports, fortunately a lot of modern boards have
jumpers to support different versions.  I have found that you can
run both level 1 and level 2 transeivers on the same cable.

The question:  What is the difference between the versions and what
effect is their on the physical wire to run two different types
of transeivers?  I have heard people say that it is best to have all
the same type but no "real" evidence to base that comment on.

Could someone mail me either a description of the differences or
pointers to the available documentation that would answer these questions.

As always if their is enough interest I will summarize to the net.

-- 
	David Robinson		elroy!david@csvax.caltech.edu     ARPA
				david@elroy.jpl.nasa.gov
				ames!elroy!david UUCP
Disclaimer: No one listens to me anyway!