Allied Telesis AT-IE300-12GP Installation Manual page 115

Review the powered device's documentation to confirm that it

receives power on all four strand pairs in the twisted pair cable
(combined Alternatives A and B). Hi-PoE devices may only partially
work if they can receive power on only one Alternative.
Verify that the Hi-PoE device is connected to a Hi-PoE port. The

switch supports Hi-PoE devices on ports 9 to 12, but not ports 5 to
8.
Use the SHOW POWER-INLINE command on the switch to

confirm that both Alternatives A and B are enabled on the port. The
default settings are enabled for Alternative A and disabled for
Alternative B. If necessary, use the POWER-INTERFACE PAIR
command to enable Alternative B.
Check the 90% POE LED on the front panel of the switch. If it is

solid green, the switch might not have enough free power for
additional devices.
Use the SHOW POWER-INLINE command to determine the

amount of unused, available power by subtracting the Actual
Power Consumption value from the Power Allocated value. The
switch cannot support the Hi-PoE device if this value is less than
the device's power requirements.
Use the SHOW POWER-INLINE command to determine whether

the Hi-PoE power setting for the port was reduced to a value below
the power requirements of the device.
Verify that you are using the appropriate category of twisted-pair

cable by referring to Table 3 on page 27.
Try connecting the device to a different port on the switch.

Try replacing the twisted pair cable.

IE300 Series Installation Guide
115