130
C
HAPTER
8: T
ROUBLESHOOTING
THE
NIC
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:
1 Make sure that the NIC, the network driver, and the
3Com NIC Diagnostics program are installed.
2 Open the Windows
Start
menu.
3 Select
Programs
, and then
3Com NIC Utilities.
4 Click
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).
100
LNK
(link)
On
If drivers are installed, the 100BASE-TX connection is active.
If drivers are not installed, the NIC is receiving power.
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
(activity)
Blinking Network traffic is present.
Steady
Heavy network traffic is present.
Off
No network traffic is present.
LED
State
Meaning (continued)
For instructions on using the 3Com NIC Diagnostics
program, see Running NIC Diagnostics on page 143.