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. 

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. 

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