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Path: utzoo!utcs!lsuc!pesnta!hplabs!nsc!daisy!david
From: david@daisy.UUCP (David Schachter)
Newsgroups: net.lan
Subject: Re: Mixed Ethernets and DELNIs
Message-ID: <55@daisy.UUCP>
Date: Wed, 20-Feb-85 23:00:53 EST
Article-I.D.: daisy.55
Posted: Wed Feb 20 23:00:53 1985
Date-Received: Wed, 27-Feb-85 09:19:36 EST
References: <133@cernvax.UUCP>
Reply-To: david@daisy.UUCP (David Schachter)
Organization: Daisy Systems Corp., Mountain View, Ca
Lines: 18
Summary: 


We have a very large Ethernet installation: over 300 nodes in two buildings.
Most of the nodes are multiplexed through DELNIs.  However we have about
sixty nodes going through a three-level DELNI tree.  We have had few problems.
The only time our network is funny is when we grossly violate specs.  So we
don't do that.  (Like when we had 150 nodes on a 700 meter cable, violating
both the max nodes limit, the max cable length limit, and, in most cases, the
minimum transceiver spacing limit.  Even then, the network worked but at a
reduced rate.)  By the way, our installation also includes a fiber-optic
link connecting two buildings and it includes several Xerox repeaters.  We
have had very good results with Interlan equipment: the stuff is usually
flawless and the few problems we have had have been fixed quickly.  We find
Interlan to be a responsive vendor.

If you get good results mixing Ether cable and Cheaper cable, fine.  But we
won't do that: surely it must be pretty violent on impedance mismatching!
Of course, if you do not have a long cable and if the number of nodes is low,
you can get away with almost anything, it seems.