Chapter 6: Troubleshooting
77
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.