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Twisted Pair Ports
The following are troubleshooting suggestions for the PoE+ RJ-45 twisted
pair port on the AT-2914GP/SP network adapter:
Problem 1: The network adapter is connected to the AT-2914GP-PSU
power adapter but is not providing power to the powered device on the
RJ-45 twisted pair port. Try the following:
Verify that the network cable is securely connected to RJ-45 ports
on the network adapter and powered device.
Verify that the DC wire on the AT-2914GP-PSU power adapter is
securely connected to the DC connector on the AT-2914GP/SP
network adapter.
Verify that the AC outlet has power by connecting another device
to it.
Verify that the computer and powered device are operating
normally.
Check that the power requirements of the powered device do not
exceed 25.5 W. Refer to the device's documentation or data sheet.
Try replacing the AT-2914GP-PSU power adapter.
Try connecting another PoE device to the network adapter.
Try replacing the twisted pair cable.
Problem 2: The network adapter is not providing power from the PCIe
connector to a powered device on the RJ-45 twisted pair port. Try the
following:
Verify that the network cable is securely connected to RJ-45 ports
on the adapter and powered device.
Verify that the computer and powered device are operating
normally.
Verify that the power requirements of the powered device do not
exceed the maximum power available from the network adapter.
First, determine the power requirements of the powered device by
referring to its user documentation. Then compare that to the
output of the computer's PCIe 12V power rail. This is usually
10-15W. This value can be found in the computer's user
documentation. As a safety margin, reduce the power rail value by
20%. The resulting value is the maximum power that the network
adapter can supply from its RJ-45 port to a powered device. For
example, if the computer's PCIe power rail has an output of 14W,
the network adapter can provide a maximum of 11.2W to a
powered device.
Chapter 8: Troubleshooting
107
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