Allied Telesis AT-9000/28POE, AT-9000/12POE manual Power Over Ethernet

Chapter 6: Troubleshooting

Power Over Ethernet

This section applies only to the AT-9000/12POE and AT-9000/28POE switches.

Each RJ-45 port switch has two LEDs. The left LED provides port link and activity status, and the right LED provides PoE status information. The PoE LED is solid green when PoE is enabled. The PoE LED of a port that is not delivering power will be steady amber or off. If a powered device is not receiving power from a port on the switch, try the following:

If all of the LINK/ACT LEDs on the switch are off, try pressing the ecoFriendly button on the switch front panel to turn on the LEDs.

Review the power device’s (PD) documentation to confirm that it supports Mode B of the IEEE 802.3at standard. Mode B is one of two modes that define the connector pins that deliver the power from the port on the switch to the PD. In Mode B, the power is carried on pins 4, 5, 7, and 8 on the RJ-45 port. 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 AT-9000/12POE and AT-9000/28POE switches do not support Mode 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 Mode A will not work with these 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 27.

Try replacing the twisted-pair cable.

Use the SHOW POE INTERFACE command in the management software to determine whether PoE is enabled on the port. The default setting for PoE is enabled.

Use the SHOW POE INTERFACE command 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 PD to a port on a different switch.

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