3Com XLPCI manual Interpreting the Link LED, Meaning RJ-45, State, Off, Blinking

1-8CHAPTER 1: INSTALLING THE NETWORK INTERFACE CARD

Interpreting the Link LED

The 3C900B NICs have one light-emitting diode (LED). When the LED is on (but before the driver is loaded), the LED indicates that the NIC is receiving power.

Other than indicating that the NIC is receiving power, the LED serves no other purpose for either an AUI or a BNC media connection. Table 1-2 explains the LED states for 3C900B NICs.

Table 1-2	LED Interpretation
			Connector
LED
	Meaning	RJ-45	AUI	BNC
State
On	If drivers are installed, the	Yes	N/A	N/A
	connection is active.
	If drivers are not installed, the	Yes	Yes	Yes
	NIC is receiving power.
Off	Something is preventing the	Yes	N/A	N/A
	connection between the NIC
	and the hub.
Blinking	The cable polarity is reversed.	Yes	N/A	N/A
	Try a different network cable or
	contact your MIS representative.

If the NIC LED indicates a problem, check the following:

1Ensure that your network hub and the network cable connecting to your 3C900B NIC comply with the 10BASE-T specifications.

2Ensure that the hub is powered on.

You have completed the hardware installation.

The next step is to install the network driver. Go to the next chapter.