Module Diagnostics - 3Com 3C54321 Installation Manual

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Module Diagnostics The system runs diagnostics tests at power up or when you replace a
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module with the power on. Watch for these indicators:
During diagnostics tests, the module's Error LED lights yellow.
When the diagnostics tests are successfully completed, the Error LED
turns off and the port status L (Link Status) LED lights green.
If a port status E (Error) LED remains yellow, the port is not operational.
If the module's Error LED lights yellow, the module has failed a
diagnostic test.
To troubleshoot module failures, see Chapter 7 in the Getting Started
Guide.
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UIDE