Troubleshooting Chart, Symptom Cause Solution

Troubleshooting Chart

The following table lists symptoms, causes, and solutions of possible problems.

Symptom	Cause	Solution

Power LED is off.	No power is received.	Check the power cord connections and the
		connected device. Ensure all cables used are correct
		and comply with Ethernet specifications.

Link LED is off or	Port connection is not	Check the crimp on the connectors and make sure
intermittent.	working.	that the plug is properly inserted and locked into the
		port at both the switch and the connecting device.
		Ensure all cables used are correct and comply with
		Ethernet specifications. Check for a defective
		computer adapter card, cable, or port by testing them
		in an alternate environment where all products are
		functioning.

File transfer is slow or	Half-duplex or full-duplex	Make sure the attached device is set to
performance degradation	setting on the switch and	auto-negotiate.
is a problem.	the connected device are
	not the same.

A segment or device is	One or more devices are	Verify that the cabling is correct. Ensure all
not recognized as part of	not properly connected,	connectors are securely positioned in the required
the network.	or cabling does not meet	ports. Equipment may have been accidentally
	Ethernet guidelines.	disconnected.

ACT LED is flashing	A network loop	Break the loop by ensuring that there is only one
continuously on all	(redundant path) has	path from any networked device to any other
connected ports and the	been created.	networked device. After you connect to the switch
network is disabled.		management interface, you can configure the
		Spanning Tree Protocol (STP) to prevent network
		loops.