3Com EtherLink 3C985B-SX Installation And User Manual - page 30
4 Troubleshooting
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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:
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
State
Description
Data
Blinking
On
Off
Data detected on the port.
Data detected on the port.
No data detected on the port.
Link
Blinking slowly
On
Off
Port has been disabled by software.
Good link.
No link; possible bad cable, bad connector, or configuration mismatch.
LED
State
Description
Data
Blinking
On
Off
Brief bursts of data detected on the port.
Streams of data detected on the port.
No data detected on the port.
10
On
Off
Good 10 Mbps Ethernet link
No 10 Mbps link; possible link at different speed, possible bad cable,
bad connector, or configuration mismatch.
100
On
Off
Good 100 Mbps Fast Ethernet link.
No 100 Mbps link; possible link at different speed, possible bad
cable, bad connector, or configuration mismatch.
1000
On
Off
Good Gigabit Ethernet link.
No 1000 Mbps link; possible link at different speed, possible bad
cable, bad connector, or configuration mismatch.
NOTE: If all four LEDs remain lit simultaneously, the NIC driver software is either missing or improperly
installed.