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Separate procedures are provided for troubleshooting FDDI and Fast Ethernet modules.
When FDDI modules are first installed, all of their LEDs light, and then the module runs a series of tests called the Power-On Self-Test (POST). If the module passes the POST, the module's enabled LED remains on. If the module fails the POST, the module's enabled LED blinks to indicate a problem. Table 4-1 lists some of the problems that can arise following the POST along with the actions you could take to correct them.
Table 4-1 Troubleshooting FDDI Modules
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Connected LED does not come on | No cable inserted | Insert both ends of the cable into a device. |
| Module not enabled | Verify that the Module Enabled LED is lit. | |
| Wrong cable type | If UTP, verify that the cable selection is a cross-over FDDI cable. | |
| Bad cable | Replace cable with a known good cable. | |
| Module Enabled LED does not come on | Module not installed properly | Remove module and reinstall. |
| Device(s) not powered on | Ensure that FastSwitch has power. |
When first powered on, all LEDs on the module front panel are on, and a Power-On Self-Test (POST) automatically begins. If the module passes POST, the Module Enabled LED on the FastSwitch remains on. If the module fails POST, the Module Enabled LED is off to indicate a problem.
Table 4-2 lists some symptoms of problems that may occur during POST and describes a possible cause and corrective action.
Table 4-2 Troubleshooting Fast Ethernet Modules
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Link LED does not come on | No cable inserted | Insert both ends of the cable into a device. |
| Device has no power | Ensure that both devices have power. | |
| Module not enabled | Verify that the Module Enabled LED is on. | |
| Wrong cable type | Verify the cable selection (crossover versus non-crossover). | |
| Bad cable | Replace with known good cable. | |
| Module Enabled LED does not come on | Module not seated properly | Remove module and reinstall. |
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