On (steady)

Normal operation: power is present from I/O base, and the adapter is ready for network communication.

3 flashes, long off

No link: The network cable is not connected or is defective.

4 flashes, long off

No MAC address: The adapter’s MAC address is not set. Internal hardware problem.

5 flashes, long off

No IP address: The adapter is attempting to obtain an IP address from a BOOTP server.

6 flashes, long off

The adapter’s internal executive program has started, but cannot initialize the I/O base.

7 flashes, long off

The adapter has obtained an IP address, but does not have a valid executive program.

8 flashes, long off

The adapter’s executive program has failed during execution.

Flashing constantly

Adapter is downloading its executive program.

Flashing

Normal operation: Adapter detects network activity. Flashing rate indicates the amount of activity. May appear steadily on if network activity is high.

Off

Adapter is not detecting any network activity.