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Does the failure symptom you are troubleshooting in a specific
lobe area appear to be related to a lobe cable?
 Go
to page 3.1.
Does the failure symptom you are troubleshooting with a group
of ring stations/network peripherals or the complete Token Ring network
appear to be related to the main ring path?
Go
to page 3.2.
3.1 A lobe
cable appears to be causing a failure symptom in a lobe path.
Remove the lobe cable from the MAU or wiring hub port and the NIC. Test
the lobe cable with either a TDR or a ring cable-specific tester.
Did testing the cable find any faults in the cable?
The suspected bad cable is faulty.
Take the necessary action to resolve the problem by replacing the respective
lobe cable in the lobe area, and retest the ring station or network peripheral
for proper operation. If the failure symptom is gone, record the problem
in the network maintenance and service log. If problems still exist, go
to the next step.
 If no faults are found by testing
the lobe cable, then another network component (such as the MAU or wiring
hub port, ring station, network peripheral, or an NIC in the suspected
bad lobe area) is most probably at fault. Re-attach the original lobe cable
into the lobe path and re-troubleshoot the respective lobe path by going
to page 2.
 If you definitely feel the
original lobe cable has a problem, it may be best to keep the newly replaced
lobe cable attached, rather than replace the original lobe cable, before
resuming troubleshooting by going to page 2. This is going to be a judgment
call on your part.
3.2 The main
ring path cabling appears to be causing a problem with a group of ring
stations or the complete Token Ring network.
Does the ring contain a repeater?
If you have not troubleshot the
repeater, and you feel it may be introducing a problem into the main ring
path, go to page 9. If you are confident
it is not the problem, go to the next step .
Disconnect the first MAU in the MAU rack from the ring by disconnecting
its RI and RO cables.
If your main ring path is
configured in such a way that your MAUs are spread out and are not properly
centrally located in a MAU rack, the following procedure may be more difficult.
Also, in the case of a wiring
hub, you may have to take a unique approach, such as removing the respective
wiring hub modules from the wiring hub. Do not overlook the manufacturer's
instructions. Check for any available specific MAU connection diagnostics.
Next, test the first MAU by verifying that the ring stations connected
to it can properly perform ring insertion.
Did the first MAU test OK?
Disconnect the second MAU from
the ring and connect it to the first MAU. Next, test the new ring configuration
operation (first and second MAU) by verifying that the ring stations connected
to it can properly perform ring insertion.
Continue to use the troubleshooting
method of disconnecting the next physical MAU in the MAU rack from the
original ring configuration and adding it to the new ring configuration
until a problem is encountered.
If adding a network component, such as a MAU or main ring path cabling
section, to the new ring configuration causes a problem, go to the next
step . If no problems are found in any of the main ring path components,
go to page 15 .
Replace both the MAU and main ring
path cabling sections added to the new ring configuration and that caused
the failure symptom to arise. Retest the ring.
Retesting the ring should
be done by putting aside the suspected bad MAU and main ring cabling path
section and then reconnecting the rest of the network to the new ring configuration.
If no problems are encountered, record the problem in the network maintenance
and service log. If problems still exist, restart troubleshooting back
from the last MAU that tested properly. More than one failure may be on
the network. If you continue to arrive back at this point, go to page15
.
November 15, 1996
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