3Com 3CR990SVR97, 3CR990-TX-97, 3CR990-TX-95 Viewing the NIC LEDs in the Diagnostics Program, Lnk

130CHAPTER 8: TROUBLESHOOTING THE NIC

LED	State	Meaning (continued)
100	On	If drivers are installed, the 100BASE-TX connection is active.
LNK
		If drivers are not installed, the NIC is receiving power.
(link)
	Off	Something is preventing the connection between the NIC and
		the hub or switch.
	Blinking	The cable polarity is reversed. Try a different network cable or
		contact the system administrator.
ACT	Blinking	Network traffic is present.
(activity)
	Steady	Heavy network traffic is present.
	Off	No network traffic is present.

If a LNK LED indicates a problem, check the following:

■Ensure that the network hub or switch and the cable connecting to the NIC comply with the specifications appropriate for the network connection.

■Ensure that the hub or switch is powered on.

Viewing the NIC LEDs in the Diagnostics Program

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

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

For instructions on using the 3Com NIC Diagnostics program, see Running NIC Diagnostics on page 143.

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 following LEDs:

Link—lights if there is a valid connection between the NIC and the network.

Transmit—lights if the NIC is transmitting information. Receive—lights if the NIC is receiving information.

Duplex—indicates if the NIC is transmitting data across the network in half-duplex mode (half the LED lights), or in full-duplex mode (the entire LED lights).