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From: raj@limbo.uci.EDU.UUCP
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Ethernet versions
Message-ID: <2458.564342605@limbo.uci.edu>
Date: Fri, 20-Nov-87 05:49:31 EST
Article-I.D.: limbo.2458.564342605
Posted: Fri Nov 20 05:49:31 1987
Date-Received: Sun, 22-Nov-87 10:07:54 EST
References: <184@bnl.ARPA>
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 59

I got this from the little booklet that comes with our ST-500 transceivers
that we bought from Cabletron.  (Cute, each one comes with a really complete
book telling all sorts of things about transceivers and such.)

We always make sure our transceiver cables have pin 1 connected to ground.
(Our Computing Facility used to connect pin 4 to ground to agree with 802.3
but then they couldn't be used on V2.0 so we always get pin 1 as ground now.)
We've used the same transceiver cables on V1.0, V2.0, and 802.3.  We have
mixtures of all versions on the same ethernet with no problems although we're
now trying to always go with 802.3 in the future.

Hope all of this helps.


		V1.0			V2.0			IEEE 802.3
-----------------------------------------------------------------------
Transceiver	(3) 22 AWG pairs	(4) 20 AWG pairs	(4) 20 AWG
cable		(1) 20 AWG inner	Inner & outer		pairs
		& outer shield		shield common		Inner & outer
		common at		at backshell		shield isolated
		backshell and		and pin 1		from each other
		pin 1						Outer shield at
								backshell,
								inside at pin 4
								Indented male
								connector for
								better
								electrical
								connection.

Transceiver	Full step		Half step		Half step
		No heartbeat		Heartbeat		Heartbeat

(SQE)
  Grounding	Pin 1			Pin 1			Pin 1, 4, 11 &
								14
								Ground indents
								on male
								connector.
								Jabber latching


Repeater	No requirements		No requirements		Redundant
								collision
								protection
								using Jam
								sequence,
								Segments
								excessive
								collision
								segment from
								network.


Vendors		Xerox, U-B,		DEC			U-B, 3COM, DEC,
		Gould, Harrris,		Cabletron		HP, Xerox,
		Cabletron					Micom-Interlan,
								Intergraph,
								Cabletron