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From: nguyen@amd.AMD.COM (Quinn Nguyen)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Ethernet versions
Message-ID: <4652@amd.AMD.COM>
Date: Tue, 10-Nov-87 19:46:14 EST
Article-I.D.: amd.4652
Posted: Tue Nov 10 19:46:14 1987
Date-Received: Fri, 13-Nov-87 06:15:18 EST
References: <4800@elroy.Jpl.Nasa.Gov>
Lines: 25
Keywords: info?
Summary: Ver. 1 vs Ver. 2 and 802.3

In article <4800@elroy.Jpl.Nasa.Gov>, david@elroy.Jpl.Nasa.Gov (David Robinson) writes:
> 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
> ...
> 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.
> 

Ethernet version 2 and ANSI/IEEE 802.3 (10BASE5) signals are
physically the same.
Version 1 and 2 signals are the same in the coax.
The main differences are on the Drop cable:
- SQE (Signal Quality Error) generation after a packet transmission
required for version 2 and 802.3 but not for version 1.
- Half-step idle signal (differentially 0) with transformer
isolation required for version 2 and 802.3 but not for version 1.
 If a MAU (transceiver) does not generate SQE and only accepts,
generates full-step signals (Ver. 1), it may have problem connecting
to a version 2 DTE or vice versa.
Other issues are device to device line static isolation, ground,
etc. which are not relevant to transceiver connection...
in term of functionality.
  Hope this may help.