| Title: | Alpha Workstation Conference |
| Notice: | See note 1.* for conference notices |
| Moderator: | WRKSYS::HOUSE |
| Created: | Wed Sep 07 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1996 |
| Total number of notes: | 9122 |
One AS500/500 has been causing network errors. It looks like the
internal Ethernet ( thinwire MAU ) is the culprit. A PCI device
works, while ping on the internal NI has >80% error rate.
It is a technical University and so we have lots of environmental
factors to check, but it looks like the BNC connector has its outer
connection ( ground or shield ) connected to the chassis ground !!!
I always thought that the two pins from the BNC were not connected
to ground/chassis in the system.
Is this correct ?
What did we do:
1) ordered a MAU and a system board. We get 0 Ohms from then BNC
outer metal to grounds/shields on the system board. We also
verified this on a full AS255.
2) we had a look at different NI cards. These pins seem to have no
connection to the chassis ground. A KZPSM, which has the same Tulip
and the HALO work. So the grounding must have taken another path
too.
3) works in another network. Which means that this particular
network is getting power disturbances. Isolating the ground from
the power ( floating ) seems to solve the network errors. This
cannot be done due to safety reasons. We will look at the power
with an analyzer.
To sum it, we think it a problem with the MAU card. Can someone
comment ?
/Azfar Khan
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1835.1 | AS500/500 MAU Problem | WRKSYS::MURRAY | Tue Feb 04 1997 10:08 | 2 | |
The AS500/500 MAU Problem was found and fixed. Apparently some of the "bad" ones were shipped. Did a replacement MAU have the same problem? | |||||
| 1835.2 | MAU Rev C is what I want ! | FRAIS::KHAN | Tue Feb 04 1997 10:47 | 6 | |
According to Rick Rudman, this problem was fixed with Rev.C MAU. We
have revision B02. Also the newly ordered ones from JGO. But now with
this new information I will try to get a C-one.
Thanks,
Azfar
| |||||
| 1835.3 | Info gets everywhere ? | FRAIS::KHAN | Mon Feb 10 1997 10:23 | 6 | |
Looks like our Logistics has lots of these 'bad' spares. Does anyone
start a Logistics-purge or replacement process once such faults are
found. As this is a new system, I would also assume that the these
modules are being installed in the factory ( AYR ) too. I have sent a
mail to Quality@ayo.
/Azfar
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