Diagnostic Results, Troubleshooting | Cabletron Systems 3H08-04

Diagnostic results

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.

To start both types of loopback tests, use the NMS. When you use the NMS for these tests, the results are reported back to the NMS.

5.4 DIAGNOSTIC RESULTS

ATX diagnostic results are indicated in two ways: by looking at 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. Although you might ﬁnd it more convenient to just watch the LEDs, 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).

5.5 TROUBLESHOOTING

5.5.1 If the Module Fails to Power Up

If the FE Switch Modules fail to power up when the ATX is on and functioning properly:

1.Check the status of ports using Local Console Manager.

2.Reset the switch module and watch the power-up sequence again.

3.If the sequence is still abnormal:

a.Remove the interface module by unscrewing the two retaining screws on the module front panel.

b.Carefully, but firmly, press down on all socketed components.

c.Re-install the module. Make sure the module is properly seated and tighten the retaining screws.

d.Reset the ATX and observe the power-up sequence.

4.If it is still abnormal, contact Cabletron Systems Technical Support.

FE Switch Module User Guide

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