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From: sting@LAOTSE.CAM.NIST.GOV (s. ting)
Newsgroups: comp.sys.proteon
Subject: ProNET-80 i/f Problem
Message-ID: <9102061502.AA10733@laotse.ccamyp>
Date: 6 Feb 91 15:02:39 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 31

The ProNET-80 i/f of one of our p4200s on the ring
failed late last Friday. It came back by itself 
around 3 pm Sunday's afternoon. Then it failed again
yesterday afternoon. The router itself has been up
all the time.

We tried to find out what the source of this 
intermittent problem come from. As I remember, the
results of "test i/f" under "t 5" were always
successful according to the router under three 
different physical configurations: 1) a loopback 
plug on the p4200's pronet-80 i/f connector, 2) a
loopback plug on the end of the pronet-80 black
cable, and 3) the p4200 connected to p3280 through
black-red cable.

But, if we passively waited, then sooner or later
the router would declare the i/f down. We swapped 
the p3280 and the red cable, nothing changed. We
are reluctant to swap the ProNET-80 CTL board since
we know the current CTL board is well aligned while
our spare CTL boards are not.

I would appreciate very much for any idea about the
source of the problem and/or which part of the system
may cause the problem.


Michael Ting,
NIST, (301) 975-3802