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Troubleshooting
Token Ring Switch Module User Guide Page 5-3
For both types of tests, normal operation is indicated when generated
packets are received back (after looping) without errors. For remote
loopback tests, the ATX creates LLC Type 1 test packets for LANs and
PPP echo-request packets for WANs and UARTs.
Both types of loopback tests can be initiated by the NMS, and test results
are reported to the NMS.
5.2.2 Diagnostic Results
The ATX diagnostic results are indicated in two ways: by observing the
front panel LEDs (which are explained later in this chapter) or by reading
NMS trap messages. Both power-up and loopback diagnostics produce
traps, which are sent to the NMS and may be logged for future reference.
In some cases it may be more convenient to simply observe the LEDs, but
in most cases traps provide more information. There are no LEDs for the
loopback tests—the results of these tests must be observed (i.e., accurate
packet transmission) or read using an NMS (i.e., examine traps).
5.3 TROUBLESHOOTING
5.3.1 If the Module Fails to Power Up
If the Token Ring module fails to power up when the ATX is on and
functioning properly:
1. Check the status of ports using LCM.
2. Reset the Token Ring module and observe the power-up sequence
again.