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4.2 A suspected bad MAU or wiring hub module appears to be causing failure symptoms with multiple users or the complete Token Ring network.Whether the failure symptom is solid or intermittent, remove the suspected bad MAU or wiring hub module and associated main ring path cabling sections from the ring configuration and then retest the ring. Are the failure symptoms now gone?  The respective MAU, wiring hub module, or a main ring path cabling section
is at failure. Replace the removed unit and cables with another unit and
cables. Retest the new ring configuration. If no problems are encountered,
record the problem in the network maintenance and service log. If problems
still exist, go to the
next step.
 Even if your problem is now fixed, if you feel
that one of the main
ring path cabling sections did cause the problem, you can verify the problem
by going to
page 3.
If you want to verify the MAU or
wiring hub failure, you can do so with any available manufacturer diagnostics.
 If failure symptoms still exist, reinsert the original
MAU or wiring hub module and respective cables into the ring configuration.
Have you troubleshot and verified the integrity of the main ring path cabling? Run a protocol analysis session to gain more conclusive
fault isolation data by going to page 15.
Troubleshoot the main ring path cabling by going to
page 3.
November 15, 1996 
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