Is the failure symptom isolated to a fault domain (for example,
two lobe areas/two respective ring stations or network devices)?
Go
to page 2.1.
Is the failure symptom already located to a specific lobe area?
Go to page 2.2.
2.1 Failure
symptom is located to a fault domain.
Remove one of the lobe cables involved in the fault domain from the
MAU or wiring hub. Retest the ring.
Is the failure symptom gone?
You have located the problem
to the removed lobe area. Go to page 2.2 and troubleshoot the removed lobe
area.
If problems still exist after
following page 2.2, come back up to this page (2.1). Then go directly to
the next step to troubleshoot the other lobe area in the fault domain as
a possible fault.
Reconnect the first suspect lobe
area cable and disconnect the second lobe area cable and retest.
Is the failure symptom gone?
You have located
the problem to the removed lobe area. Go to page 2.2 and troubleshoot the
removed lobe area.
If problems still exist, first
attempt restarting at the top of this page.
If you end up back at this same point,
go to page 15.
Remember that if you defined
this fault domain from data captured during a protocol analysis session,
the Beacon MAC Frame should be examined. If the Beacon type field is classified
as a Signal Loss Error, a cable involved in the fault domain may be at
fault.
2.2 Failure
symptom is located to a specific lobe area.
Disconnect the suspected lobe cable from its original MAU or wiring
hub port and connect it to another MAU or wiring hub port. Retest the ring.
Is the failure symptom gone?
The
original specific MAU or wiring hub port is bad. Troubleshoot the specific
MAU or wiring hub port by going to page 4 (MAU Problems).
Test the lobe cable with a TDR
or a ring cable tester.
If any faults are found with the cable,
verify the cable fault by going to page 3 (Cable Problems).
If no cable faults exist, go to the next step.
Have you thoroughly troubleshot the ring station or network peripheral
involved in this lobe area?
Troubleshoot
the respective NIC by going to page 5 (NIC Problems).
Troubleshoot the respective ring
station or network peripheral by going to either page 6
(Ring Station Problems) or 10 (Network
Peripheral) .
If you tried troubleshooting all the network components in the respective
lobe area ring station, network peripheral, NIC, MAU or wiring hub, and
cabling and the failure symptom still exists on the ring, attempt to gather
more conclusive fault-isolation data by going to page
15.
November 15, 1996
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