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7
Interpreting the NIC LEDs
LED
State
LNK (link)
Green
Amber
Off
ACT (activity)
Blinking
Steady
Off
Running NIC Diagnostics
This chapter explains how to:
Interpret the NIC LEDs.
I
Run the NIC diagnostic tests.
I
View network statistics.
I
Use the 3Com icon in the Windows system tray.
I
The NICs have light-emitting diodes (LEDs), as described in the following tables, that can
assist with network diagnostics and troubleshooting.
Some LNK LED states do not apply to the AUI, BNC, SC, and ST connectors that are
present on some NICs, as indicated by N/A in the table.
Depending on your NIC model, the NIC may have two or three LEDs.
2-LED Configuration
Meaning
If drivers are installed, the 10Mbps
connection is active.
If drivers are installed, the 100Mbps
connection is active.
Something is preventing the
connection between the NIC and the
hub or switch.
Network traffic is present.
Heavy network traffic is present.
No network traffic is present.
Connector
RJ-45
AUI
BNC
Yes
N/A
N/A
Yes
N/A
N/A
Yes
N/A
N/A
Yes
N/A
N/A
Yes
N/A
N/A
N/A
N/A
N/A
SC
ST
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
45
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Troubleshooting
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