Instructions
Insert one end of the Ethernet cable into the LAN connector port on the back of the PS3 console.
Insert the unconnected end of the cable into the cable modem's Ethernet port, located on the back of the modem.
Power on the console by pushing the power button on the front of the machine and turn on your television.
Switch your television to the proper video output channel to view the PS3's main menu.
Scroll to the Settings menu and select "Network Settings" if you are unable to automatically connect to the Internet after plugging in the Ethernet cable.
Click "X" on your machine's game controller and select "Internet Connection Settings." Click "X" and click "Wired Connection."
Click the right arrow on the controller and select "Easy" to finish the network configuration.