Power Over Ethernet - Allied Telesis AT-IE300-12GP Installation Manual

Chapter 6: Troubleshooting

Power Over Ethernet

114
Problem: The AT-IE300-12GP Switch is not providing power to a PoE or
PoE+ device.
Solutions: Try the following:
Check that the device's power requirements do not exceed those

listed in Table 2 on page 26. The power requirements should be
included in the device's documentation or data sheet.
Start a local or remote management session on the switch and

enter the SHOW POWER-INLINE command. Subtract the Actual
Power Consumption value from the Power Allocated value to
determine the amount of unused power. The switch cannot support
the powered device if this value is less than the device's power
requirements.
Verify that you are using the appropriate category of twisted-pair

cable by referring to Table 3 on page 27.
Try replacing the twisted pair cable.

Use the management software on the switch to determine whether

PoE/PoE+ is enabled on the port. The default setting is enabled.
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 whether

the PoE power setting for the port was reduced to a value below
the power requirements of the device.
Try connecting the device to a different port on the switch.

If the device is a legacy PoE device that only supports Alternative

B, verify that it is connected to ports 9 to 12. (Legacy devices that
only support Alternative B are not supported on ports 5 to 8.) Then
use the SHOW POWER-INLINE command to verify that
Alternative B is enabled and Alternative A disabled on the port. If
necessary, use the POWER-INTERFACE PAIR command to
enable or disable Alternatives A and B.
Problem: The AT-IE300-12GP Switch is not providing any power or only
partial power to a Hi-PoE device.
Solutions: Try the following solutions:
Review the device's documentation to confirm that maximum

power consumption of the powered device does not exceed
51.8W, which is the maximum amount of power a switch port can
support. A device may only partially work if it has a higher
consumption value.