3Com 3CNJ100 Installation Manual page 29

If using Power Over Ethernet, make sure the
other end of the network cable is plugged into a
switch on the network that has Power Over
Ethernet integrated into it, or one that feeds into
an external midspan power supply that supports
Power Over Ethernet.
Local power supply is plugged into the Network Jack and
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into a working electrical outlet, if your network does not
support Power Over Ethernet.
Verify the Network Jack is connected to the network
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properly by viewing the Link LED (it should be lit). If the
Link LED is not lit, make sure the network cable:
Is terminated properly. Refer to the connector
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manufacturer's instructions for terminating the cable.
Be sure to test the connector and verify it is working.
Has a valid connection to the network.
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Adheres to proper length and cabling specifications for
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your network.
Make sure the port on the switch to which the Network Jack
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is connected is configured as a standard MDI-X port.
Troubleshooting the Network Jack
25