Poe Device Is Not Receiving Power - Allied Telesis AT-9408LC/SP Installation Manual

Chapter 3: Troubleshooting

PoE Device is Not Receiving Power

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If a powered device is not receiving power from the AT-9424T/POE
Switch, do the following:
Check to be sure that the powered device is designed to receive
power over pins 1, 2, 3, and 6 on the RJ-45 port. This can be verified
by reviewing the device's documentation or data sheet.
Check that the device's power requirements do not exceed 15.4 W.
This can be verified by reviewing the device's documentation or data
sheet.
Verify that the twisted pair cable is Category 5 or 5E.
Verify that the twisted pair cable is not faulty.
Use the AT-S63 management software to determine whether PoE is
enabled on the switch and the port. The default setting for PoE is
enabled.
Use the management software to determine whether the PoE power
setting for the port has been reduced from the default setting of 15.4
W, to a value below the power requirements of the device.
PoE is not supported on the SFP slots.
Verify that the power budget on the switch is not being exceeded by
the powered devices. This should not be a problem for the AT-9424T/
POE Switch, which can support powered devices on all ports 1 to 24,
even when all devices require the maximum of 15.4 W.