10/100/1000Base-T Nics - 3Com EtherLink 3C985B-SX Installation And User Manual

4 Troubleshooting
1 Verify that the NIC driver software has been installed and that the NIC is connected to a network.
2 Verify that the NIC status LEDs operate as described in the following table:
LED
Data
Link

10/100/1000Base-T NICs

The faceplate of the 10/100/1000Base-T NIC has four LEDs: one for each port speed option (10Mbps, 100Mbps,
and 1Gbps), to indicate which link is active, and one LED for data transfer status (see "10/100/1000Base-T NICs"
on page 10).
Before the port LEDs can provide troubleshooting information, the NIC must be connected to the network (see
Chapter 2), and the network drivers for your particular operating system must be installed (see Chapter 3).
1 Verify that the NIC driver software has been installed and that the NIC is connected to a network.
2 Verify that the NIC status LEDs operate as described in the following table:
LED
Data
10
100
1000
NOTE: If all four LEDs remain lit simultaneously, the NIC driver software is either missing or improperly
installed.
26
State Description
Blinking Data detected on the port.
On Data detected on the port.
Off No data detected on the port.
Blinking slowly Port has been disabled by software.
On Good link.
Off No link; possible bad cable, bad connector, or configuration mismatch.
State Description
Blinking Brief bursts of data detected on the port.
On Streams of data detected on the port.
Off No data detected on the port.
On Good 10 Mbps Ethernet link
Off No 10 Mbps link; possible link at different speed, possible bad cable,
bad connector, or configuration mismatch.
On Good 100 Mbps Fast Ethernet link.
Off No 100 Mbps link; possible link at different speed, possible bad
cable, bad connector, or configuration mismatch.
On Good Gigabit Ethernet link.
Off No 1000 Mbps link; possible link at different speed, possible bad
cable, bad connector, or configuration mismatch.