45
7 Running NIC Diagnostics
This chapter explains how to:
■ Interpret the NIC LEDs.
■ Run the NIC diagnostic tests.
■ View network statistics.
■ Use the 3Com icon in the Windows system tray.
Interpreting the NIC LEDs
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
Connector
LED State Meaning RJ-45 AUI BNC SC ST
LNK (link) Green
If drivers are installed, the 10Mbps
connection is active.
Yes N/A N/A N/A N/A
Amber
If drivers are installed, the 100Mbps
connection is active.
Yes N/A N/A N/A N/A
Off
Something is preventing the
connection between the NIC and the
hub or switch.
Yes N/A N/A N/A N/A
ACT (activity) Blinking
Network traffic is present. Yes N/A N/A N/A N/A
Steady
Heavy network traffic is present. Yes N/A N/A N/A N/A
Off
No network traffic is present. N/A N/A N/A N/A N/A
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