3Com 3CR990-FX-97 manual Troubleshooting the NIC, Interpreting the NIC LEDs

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Troubleshooting the NIC

This chapter describes procedures for locating problems you might have with the 3Com 100 Secure Fiber-FX (3CR990-FX-97) NIC. It explains how to:

■Interpret the NIC LEDs.

■Access 3Com support databases.

■Troubleshoot NIC installation problems.

■Troubleshoot NIC and network connection problems.

■Troubleshoot Remote Wake-Up.

■Remove the network driver.

NOTE: To access a database of technical information that can help you diagnose and solve NIC installation, configuration, and upgrade problems, go to:

http://knowledgebase.3com.com

Interpreting the NIC LEDs

The 3CR990-FX-97 NICs have light-emitting diodes (LEDs), as described in the following table, that can assist with network troubleshooting. Before the LEDs can be used for troubleshooting, the NIC must be connected to the network and the network driver must be installed (see Chapter 3, “Installing NIC Drivers and Diagnostics For Windows” for driver installation instructions).

LED	Description	Flashing	Steady	Off
100 LNK	Green:	N/A	Good 100BASE-FX link	No link between NIC
	Link integrity		between NIC and	and network hub or
			network hub or switch	switch
ACT LNK	Yellow:	Network traffic	Heavy network traffic	No traffic
	Port traffic	present

Viewing the NIC LEDs in the Diagnostics Program

To view the LEDs in the 3Com NIC Diagnostics program:

1Make sure the NIC, the network driver, and the 3Com NIC Diagnostics program are installed.

NOTE: For instructions on using the 3Com NIC Diagnostics program, see

Chapter 8, “Running NIC Diagnostics.”

2Open the Windows Start menu.

3Select Programs, and then 3Com NIC Utilities.

4Click 3Com NIC Doctor.

The 3Com NIC Diagnostics General screen appears and displays the following LEDs: 100 LNK — Lights if there is a valid connection between the NIC and the network. ACT LNK — Lights if the NIC is transmitting or receiving information.

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