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Posting-Version: version B 2.10.2 9/18/84 SMI; site calma.uucp
Path: utzoo!linus!decvax!decwrl!sun!calma!radzy
From: radzy@calma.uucp (Tim Radzykewycz)
Newsgroups: net.dcom,net.lan
Subject: Re: Ethernet compatability
Message-ID: <22@calma.uucp>
Date: Thu, 19-Sep-85 13:03:42 EDT
Article-I.D.: calma.22
Posted: Thu Sep 19 13:03:42 1985
Date-Received: Sat, 21-Sep-85 11:46:37 EDT
References: <391@brl-sem.ARPA> <458@mtxinu.UUCP> <804@mcvax.UUCP>
Reply-To: radzy@calma.UUCP (Tim Radzykewycz)
Distribution: net
Organization: GE/Calma Co., R&D Systems Engineering, Milpitas, CA
Lines: 33
Xref: linus net.dcom:1108 net.lan:878
Summary: 


>In article <458@mtxinu.UUCP> ed@mtxinu.UUCP (Ed Gould) writes:
> > The DEC devices are Ethernet 2 (compatible with IEEE 802.3), while the
> > 3Com transcievers are Ethernet 1.  They're compatible on the ether
> > side, but not on the device side (i.e., you can mix 3Com's and others
> > on the same Ethernet, but you can't match a 3Com transciever to
> > a DEUNA).
>Yes, the only difference between the Ethernet 1 & 2 are in the connection
>between the transceiver and the (host)controller. On the coax cable the two
>versions are supposed to be compatible.

Yes.  Here at Calma, we are running ethernet on various machines
with both ethernet 1 and 2 on a bunch of different machines, and
have never had problems with the difference (except when switching
transceivers and forgetting jumpers).

>However, I noticed that the SUN-2/50 Ethernet controller (Ethernet 1, using a
>3Com transceiver) seems to be broken.

We have SUN-2/120s and SUN-3s, some running ether-1 (TCL and
3-COM transceivers) and some running ether-2 (delni), and
have had no problems with either of them except when I forget
to change the jumper on the SUN ethernet controller that
changes between the two.

One interesting thing I discovered when I installed the DELNI:  The
ethernet-2 delni is connected to the net with an ethernet-1 TCL
transceiver.  We haven't had any problems with that combination, which
really surprised me, when I thought about it.
-- 
Tim (radzy) Radzykewycz
	calma!radzy@ucbvax.ARPA
	ucbvax!calma!radzy


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