3Com manual Troubleshooting the NJ220

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Troubleshooting the NJ220

If you encounter problems with the IntelliJack:

■Verify the IntelliJack is receiving power by viewing the Power LED (it should be on). If the Power LED is not on, make sure that:

■If using power over Ethernet, 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.

■The local power supply is plugged into the IntelliJack and into a working electrical outlet, if your network does not support Power Over Ethernet.

■Verify the IntelliJack is connected to the network properly by viewing the Link LED (it should be on). If the Link LED is not on, make sure the network cable:

■Is terminated properly. Refer to the connector 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.

■Adheres to proper length and cabling specifications for your network.

■The IntelliJack is configured for manual MDI. Be sure to use a straight-through cable. If you want to use a cross-connect cable, you must change settings in the Configuration Manager software.

Troubleshooting Matrix

Event/Message	Description	Solution
Power LED is not on	IntelliJack is not receiving	■ Ensure power supply is properly
	power	connected.
		■ For power over Ethernet, make sure
		that the cable is connected to both
		the LAN port on the back of the
		IntelliJack and to the workgroup
		switch.
		■ Make sure the upstream switch is
		configured and active
Link LED is not on	IntelliJack has no connection	■ Make sure network cable is properly
	to the network	terminated.
		■ Make sure the IntelliJack is connected
		to the network.
		■ Make sure the cable is plugged into
		the workgroup switch.
		■ Make sure the upstream switch is
		configured and active

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