Allied Telesis AT-SBX31XZ4, X3112, AT-SBX31FAN, AT-SBX31GP24, AT-SBX3161, AT-SBX3165 Troubleshooting

Chapter 3: Troubleshooting

PoE Device is not Receiving Power on AT-SBx31GP24 PoE Line Card

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:

ˆCheck 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.

ˆCheck that the device’s power requirements do not exceed 30 W. This can be verified by reviewing the device’s documentation or data sheet.

ˆVerify that the PD is not faulty

ˆVerify 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.

ˆVerify that the twisted-pair cable is not faulty by replacing it with a known good cable.

ˆUse the Switchblade x3112 Management Software to determine whether PoE is enabled on the port. The default setting for PoE is enabled.

ˆUse 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.

ˆVerify 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 34 for the maximum number of ports supported for each Class.

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