Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!ctrsol!lll-winken!uunet!mcsun!cernvax!cgch!wasc
From: wasc@cgch.UUCP (Armin Schweizer)
Newsgroups: comp.dcom.lans
Subject: Problem DELNI <--> HP lan analyzer
Keywords: DELNI, HP4972A, collisions, lan analyzer
Message-ID: <863@cgch.UUCP>
Date: 23 Aug 89 13:08:43 GMT
Organization: WRZ, CIBA-GEIGY Ltd, Basel, Switzerland
Lines: 38

IMPORTANT: read this to save you days of work!


Dear colleagues!

With our Hewlett Packard 4972A LAN analyzer we are very happy,
since it allows us to monitor our Internet- and DECnet- networks
very accurately.

However we had a hard time, since we couldn't get our DECnets
running over Ethernet clean of collisions (we thought). We measured
and replaced whatever we could --> no success --> frustration.

Now we found, that our LAN analyzer is indicating collisions
when there are none! (so the NCP on the VAX machines told the
truth).

Hewlett Packard informed us, that this is indeed not due
to a defective hardware, but will show up when you are
measuring at DELNIs.

We have further investigated on this:
- when will this problem be removed?
- is the reason DECs incompatibility with the IEEE 802.3
  heartbeat? (DEC says, they will move to IEEE soon!?!)
- is the problem showing up in DELNIs only? Or also
  at H400x etc.?

Does anybody know a cure or workaround for this problem?

Kind regards
Armin



       Armin R. Schweizer, CIBA-GEIGY AG, R1045.P.06, WRZ
                  4002 Basel / Switzerland
	          phone: -41-61-697'79'46