Manual

Chapter 6: Troubleshooting
84
Problem 8: The AT-x510-28GPX or AT-x510-52GPX 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 and AT-
x510-52GPX 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 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 26.
 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.