Allied Telesis AlliedWare Plus AT-GS980M/52, Installation Manual, Page: 85 / 94

GS980M Series Installation Guide
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below the power budget of 740W.
Solution: The power supply in the switch may have a problem. Start a
management session and use the SHOW SYSTEM ENVIRONMENT
command in the management software to determine the status of the
power supply.
Problem 6: A port on the AT-GS980M/52PS Switch is not providing power
to a PoE or PoE+ device.
Solutions: Try the following:
 Check the port’s PoE LED. Refer to Figure 5 on page 24 and
Table 3 on page 25. If the LED is flashing amber, the switch cannot
support additional PoE devices device because it is already
providing its maximum power to other devices. The maximum
power budget for the switch is 740W.
 Review the PD’s documentation to confirm that the device supports
Mode A of the IEEE 802.3at standard and that it uses pins 1, 2, 3,
and 6 on the RJ-45 port to receive power. Refer to “Wiring
Implementation” on page 28.

Check that the device’s power requirements do not exceed 30W by
reviewing its documentation or data sheet.
 Verify that you are using the appropriate category of twisted-pair
cable. Refer to “Cable Requirements” 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 overheats.