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8 Troubleshooting the NIC
This chapter describes procedures for locating problems you might have with the
3Com 10/100 PCI (3C990B) 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.
Interpreting the NIC LEDs
The 3C990B NICs have light-emitting diodes (LEDs), as described in the following table,
that can assist with network troubleshooting.
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
LED State Meaning
YEL/100 GRN/10 Green
If drivers are installed, the 10BASE-T 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 your system administrator.
YEL/100 GRN/10 Yellow
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 your system administrator.
ACT (activity) Blinking
Network traffic is present.
Steady Heavy network traffic is present.
Off
No network traffic is present.