SwitchBlade x3112 Installation Guide - Allied Telesis

Chapter 3: Troubleshooting
Power not Received on PoE Device
If you attached a powered device (PD) to a port on a AT-SBx31GP24
card, the PoE LED for the port should be green. If the device is not
receiving power or the PoE LED is flashing amber, steady amber, or is
OFF, do the following:
Check to be sure that the PD is designed to receive power over pins 1,
2, 3, and 6 on the RJ-45 port. This can be verified by reviewing the
device’s documentation or data sheet.
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 the PD is not faulty
Verify that you are using the appropriate category of twisted-pair cable:
Category 3 or better for 10 Mbps operation, Category 5/5E for 100
Mbps 1000 Mbps and Category 6/6E for 10GBASE-T operations.
Verify that the twisted-pair cable is not faulty by replacing it with a
known good cable.
Use the Switchblade x3112 Management Software to determine
whether PoE is enabled on the port. The default setting for PoE is
enabled.
Use the Switchblade x3112 Management Software to determine
whether the PoE power setting for the port has been reduced from the
default setting of 30 W, to a value below the power requirements of the
device.
Verify that the power budget on the switch is not being exceeded by
the number of PDs and their load requirements. This should not be a
problem for the AT-SBx31GP24 card, which can support PDs on all
ports 1 to 24, assuming the connected devices require no more than
30 W/port. However, if the total number of ports in the AT-SBx3112
chasssis exceeds the maximum allowed with the number of AT-
SBx3165 PoE supplies, this will result in a FAULT condition for those
ports over the limit. Refer to “IEEE802.3at Classes versus AT-
SBx31GP24 Power Levels” on page 35 for the maximum number of
ports supported for each Class.
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