Allied Telesis x530 Series Installation Manual page 120

Chapter 9: Troubleshooting
120
Check that the device power requirements do not exceed 30 W.

This can be verified by reviewing the device documentation or data
sheet.
Verify that you are using the appropriate category of twisted-pair

cable by referring to Table 2 on page 22 and Table 3 on page 22.
Use the management software on the switch to determine whether

PoE is enabled on the port. The default setting for PoE is enabled.
Use the management software on the switch to determine whether

the PoE power setting for the port has been reduced to a value
below the power requirements of the device.
Try connecting the device to a different port on the switch.

Problem 7: The switch functions intermittently.
Solutions: Check the system hardware status through the management
software:
Use the SHOW SYSTEM ENVIRONMENT command in the

Privileged Exec mode to verify that the input voltage from the
power source to the switch is stable and within the approved
operating range. The unit will shut down if the input voltage
fluctuates above or below the approved operating range.
Use the SHOW SYSTEM ENVIRONMENT command in the

Privileged Exec mode to verify that the fan is operating correctly.
Verify that the location of the switch allows for adequate airflow.

The unit will shut down if it is overheating.
Problem 8: The Switch ID LED on the front of the switch is flashing the
letter "F."
Solutions: One or more of the following problems has occurred:
A cooling fan has failed.

The switch might be overheating and may have to shut down.

Contact your Allied Telesis sales representative for assistance.