User`s guide

D-Link DFE-550TX Ethernet Adapter
Troubleshooting
If you experience any problems with the adapter, first verify that the appropriate driver is loaded, that the
proper grade of cable is employed for the network connection, and that the supporting hub is functioning
properly.
1. Ascertain that the adapter card is fully and firmly seated in the slot connector.
2. Check the length and rating of connecting cables.
3. Ascertain that the adapter PCI slot is not deactivated at the BIOS level. The CMOS Setup utility in PCI computers
ordinarily provides the option to activate or deactivate PCI slots.
4. Replace the adapter in question with a verified adapter and run NIC (software) diagnostic tests.
5. Install the questioned adapter in another PCI computer and run the tests again.
6. Remove all other PCI adapters from the computer and run the tests again. If the verification/diagnostic run is then
normal, then there is probably an interrupt number conflict which will have to be resolved manually by a CMOS
Setup utility run after you have reinstalled all of the expansion cards.
The DFE-550TX Adapter features three LED indicators to assist in network diagnostics:
• LINK/ACT Indicator
A steady green LED indicates that the card is receiving power and there is a good link between the DFE-550TX and
the device it is connected to. The LED will flash when the adapter is sending or receiving data.
• 100M Indicator
This LED shows steady green (ON) when operating at 100Mbps. It is dark (OFF) when connected at 10Mbps.
• FULL (duplex) Indicator
This LED is ON for full duplex connections and OFF when connected at half duplex.