Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!ub!boulder!daemon
From: michaele@sequent.com (Michael J. Edelman -- Network Architecture)
Newsgroups: comp.dcom.sys.cisco
Subject: Got Collision Problems?
Message-ID: <29095@boulder.Colorado.EDU>
Date: 2 Nov 90 03:17:46 GMT
Sender: daemon@boulder.Colorado.EDU
Lines: 23

After having collision problems for a long time we asked cisco to come
out and take a look at our network and our problem. To make a [very]
long story short, we found a few problems.

Jumpers W94 and W193 on the MCI cards were set for Ethernet version 1,
not Ethernet version 2/802.3 -- contrary to the documentation.  The
routers appear to be shipped configured for Ethernet version 1 although
they are documented as being shipped configured for Ethernet version
2/802.3.

The documentation -- "Installing the MCI card" in the cisco "Hardware
Products Installation Guide", appears to have Ethernet version 1 and
Ethernet version 2 swapped, so that what is documented as the jumper
setting for Ethernet version 1 is Ethernet version 2, and vice versa.

When we corrected the jumper settings, our collisions dropped from 3%
to 5% to .3%. A dramatic improvement!

Our thanks to cisco for sending the people out to help diagnose and
solve the problem!

Michael Edelman
Sequent Computer Systems, Inc.