Allied Telesis x530L Series Installation Manual page 109

Problem 5: The AT-x530L-28GPX or AT-x530L-52GPX switch is not
providing power to a PoE or PoE+ device.
Solutions: Try the following:
Review the powered device 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 in the switch to the powered device. 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-
x530L-28GPX and AT-x530L-52GPX 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 switch.
Use the SHOW SYSTEM ENVIRONMENT command to confirm

that both power supplies are operating normally.
If the problem is with a powered device connected to the

AT-x530L-52GPX switch, use the management software to
determine whether the switch has reached its maximum power
budget of 370W with one power supply or 740 with two power
supplies, and so cannot support any further powered devices
Check that the power device power requirements do not exceed

30W. This can be verified by reviewing the device documentation
or data sheet.
Verify that you are using the appropriate category of twisted-pair

cable by referring to "Twisted Pair Ports" 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.

x530L Series Installation Guide for Stand-alone Switches
109