Instructions
Turn off the PS3. Connect the Ethernet cable into the "Ethernet Out" port on the back of the PS3. Connect the other side of the Ethernet cable into the "Internet/WAN/Data" port on the broadband modem.
Turn on the PS3. Go to the "Settings" icon on the main menu. Scroll down, select "Network Settings" and press the "X" button.
Scroll down to "Internet Connection," press the "X" button and select "Enabled." Scroll down to "Internet Connection Settings," press the "X" button and select "Wired."
Select "Easy" as the setting method. The PS3 will check the network configuration. Press the "X" button. Select "Test Connection" and press the "X" button. The PS3 will use the wired connection when connecting to the PlayStation Network.