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From: jim@mcvax.UUCP (Jim McKie)
Newsgroups: net.lan
Subject: Re: mixing 3com and Interlan boards?
Message-ID: <412@mcvax.UUCP>
Date: Tue, 15-Jan-85 09:47:09 EST
Article-I.D.: mcvax.412
Posted: Tue Jan 15 09:47:09 1985
Date-Received: Thu, 17-Jan-85 14:21:18 EST
References: <356@spp2.UUCP> <231@log-hb.UUCP>
Distribution: net
Organization: CWI, Amsterdam
Lines: 35

In article <231@log-hb.UUCP> hans@log-hb.UUCP (Hans Albertsson) writes:
	>Mixing  different ethernet boards is entirely possible, just make sure
	>that each board uses the appropriate transceiver, i.e. do NOT connect a
	>3com Xceiver box to an Interlan board, or v.v. Some crossconnects WOULD work,
	>as long as they follow the same ethernet spec, e.g. both Xceiver and
	>controller use the IEEE 803.2 spec. 3com isn't ( supposedly )
	>up to the most modern standards, so Interlan board with 3com xceiver
	>wouldn't work. But all xceivers talk to each other nicely. 
Writing this on a net which consists of DEUNA, Interlan and 3Com interfaces,
with one of the 3Com boards connected with an Interlan NT100 transceiver, and
the Interlan NI1010A with a 3Com transceiver, I would say you are not entirely
correct.

In general, there are two versions, Ethernet-1 and Ethernet-2 (IEEE 802.3). These
can, as Hans says, co-exist happily on the same cable, but don't try mixing an
Ethernet-1 board with an Ethernet-2 transceiver or vice-versa, e.g. a 3Com board
with a DEC H4000 transceiver. The Interlan NT100 is supposed to work with both
Ethernet-1 and Ethernet-2 boards, although this may require strapping inside the
transceiver.

Here is a table of what works/doesn't-work from personal experience:

Transceiver	|	3Com		NT100		H4000
--------------------------------------------------------------------------
Board		|
		|
3Com		|	works		works		doesn't
DEUNA		|	doesn't		works		works
NI1010A		|	works		doesn't		doesn't

What is confusing to us (and the reason the transceivers are swapped) is that
the NI1010A won't work with the NT100 transceiver. Interlan is also wondering...

From the multi-racial net of the CWI,	Jim McKie	(mcvax!jim)
					Jaap Akkerhuis	(mcvax!jaap)