3Com 3C905C-TX-M, 3C905C-TX manual Interpreting the LEDs

56CHAPTER 6: TROUBLESHOOTING AND DIAGNOSTICS

4Click Support Databases to display customer support databases about the NIC in three categories:

■Release notes — Display tips about installing and using the NIC.

■Frequently asked questions — Display common questions asked by customers and answered by 3Com support experts.

■Knowledgebase topics — Display NIC compatibility topics.

Interpreting the LEDs

The 3C905C NIC has three light-emitting diodes (LEDs), as described in Table 9, that can assist with network troubleshooting. (See Chapter 1 for a picture of the LEDs).

Table 9 LED Interpretations

LED	State	Meaning
10 LNK		If drivers are installed, the 10BASE-T connection is active.
	On
(link)		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.
		If drivers are installed, the 100BASE-TX connection
100 LNK		is active.
	On
(link)		If drivers are not installed, the NIC is receiving power.
	Off	Something is preventing the connection between the NIC
		and the hub or switch.
ACT	Blinking	Network traffic is present.
(activity)
	Steady	Heavy network traffic is present.
	Off	No network traffic is present.