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From: cetron%utah-cbd@utah-cs.arpa (Ed Cetron)
Newsgroups: mod.computers.vax
Subject: Re:  cascading CONNECTED DELNIs is illegal
Message-ID: <8609081618.AA20602@utah-cbd.ARPA>
Date: Mon, 8-Sep-86 12:18:34 EDT
Article-I.D.: utah-cbd.8609081618.AA20602
Posted: Mon Sep  8 12:18:34 1986
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	The facts as I have found them (both from all of the manuals
as well as empirical results):

	1. NOWHERE  does it come out and actually say that cascading connected
DELNI's is illegal....

	2. There IS a restriction that for signal propagation and timing 
considerations there can be no more than 2 repeaters between and two nodes
on the ethernet.

	3. In some ways the DELNI acts as a repeater, and in other ways it
doesn't.

	4. From item three stems the restriction of no DEREP to DELNI hookup 
since why hook a repeater to a repeater?

	5. If you network HAS a repeater, than the DELNI -> DELNI -> cable ->
DEREP -> cable    DOES have more than two repeaters and MIGHT (since the DELNI
is sort of a repeater) to violate the configuration rules....

	6. I have empirically determined that a DELNI is sort of a .6 - .75 of
a repeater and have successfully cascaded the situation as in item 5 with no
trouble and an ether