Allied Telesis x310 Series - Manual (Page 110)

Chapter 7: Troubleshooting
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is carried on pins 4, 5, 7, and 8 on the RJ-45 port, the same pins
that carry the network traffic. The other mode, Alternative A,
defines pins 1, 2, 3, and 6 as the power carriers. The AT-x310-
26FP and AT-3510-50FP Switches do not support Alternative A.
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 Alternative A 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 1 on page 24.
 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.