Allied Telesis AT-x510-28GPX Installation Manual page 100

Chapter 6: Troubleshooting
100
Problem 8: The AT-x510-28GPX, AT-x510L-28GP, AT-x510-52GPX, or
AT-x510L-52GP Switch is not providing power to a PoE device.
Solutions: Try the following:
Review the PD's documentation to confirm that the device

supports Mode A of the IEEE 802.3at standard. Mode A is one of
two modes that define the connector pins that deliver the power
from the port on the line card to the PD. In Mode A, the power is
carried on pins 1, 2, 3, and 6 on the RJ-45 port, the same pins that
carry the network traffic. The second mode, Mode B, defines pins
4, 5, 7, and 8 as the power carriers. The AT-x510-28GPX,
AT-x510L-28GP, AT-x510-52GPX, and AT-x510L-52GP Switches
do not support Mode B. Most powered devices are designed to
accept power by either mode, but some legacy devices may only
support one mode. This can be verified by reviewing the device's
documentation or data sheet. Legacy devices that only support
Mode B will not work with the switches.
Check that the device's power requirements do not exceed 30 W.

This can be verified by reviewing the device's documentation or
data sheet.
Verify that you are using the appropriate category of twisted-pair

cable by referring to Table 3 on page 28.
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.
