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Troubleshooting the NIC

This chapter describes procedures for locating problems you might have with the 3Com

10/100 Secure (3CR990B) 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 3CR990B NICs have light-emitting diodes (LEDs), as described in the following tables,

that can assist with network troubleshooting.

3CR990B-97 NIC

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 Yellow If drivers are installed, the 100BASE-TX connection is

active.

If drivers are not installed, the NIC is receiving power.

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.

ACT (activity) Blinking Network traffic is present.

Steady Heavy network traffic is present.

Off No network traffic is present.

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HP Embedded Firewall Series Instrukcja Użytkownika Strona 57