3Com 5124M-TPCL manual Technical Assistance, Troubleshooting Using the Port Activity LEDs

Troubleshooting Using the Port Activity LEDs

Under some conditions a Port Activity LED may not light. Use the troubleshooting suggestions in Table 4-2 to help determine why this has occurred and to isolate the source of the problem.

Table 4-2. Troubleshooting Using the Port Activity LEDs

LED State	Possible Cause	Corrective Action
Off	There is no traffic	None.
	received from the
	segments (normal).
	Hub power is off.	Check the Controller
		Module Power LEDs.
	The Activity LED has	Press the LED test button
	burned out.	on the Controller Module.
	A 24-Port Module port	Connect the cable to a
	is faulty.	different port.
	The module	Re-insert the 24-Port
	connection to the	Module. If this fails to
	backplane is bad.	correct the problem, try
		another concentrator slot.
	The 24-Port Module is	Try a different 24-Port
	faulty.	Module.

Technical Assistance

Refer to Appendix B for instructions on contacting Technical Support for your product.

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