Troubleshooting The Nic; Interpreting The Nic Leds - 3Com 3C990B-TX-M User Manual

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Interpreting the NIC LEDs

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.
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Access 3Com support databases.
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Troubleshoot NIC installation problems.
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Troubleshoot NIC and network connection problems.
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Troubleshoot Remote Wake-Up.
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Remove the network driver.
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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
The 3C990B NICs have light-emitting diodes (LEDs), as described in the following table,
that can assist with network troubleshooting.
LED State
YEL/100 GRN/10 Green
Off
Blinking
YEL/100 GRN/10 Yellow
Off
Blinking
ACT (activity) Blinking
Steady
Off
Meaning
If drivers are installed, the 10BASE-T connection is active.
If drivers are not installed, the NIC is receiving power.
Something is preventing the connection between the NIC and the
hub or switch.
The cable polarity is reversed. Try a different network cable or
contact your system administrator.
If drivers are installed, the 100BASE-TX connection is active.
If drivers are not installed, the NIC is receiving power.
Something is preventing the connection between the NIC and the
hub or switch.
The cable polarity is reversed. Try a different network cable or
contact your system administrator.
Network traffic is present.
Heavy network traffic is present.
No network traffic is present.
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