To enable ethernet connectivity, Enabling the ethernet connection – Sony VAIO Digital Studio User Manual

PCV-RX580, PCV-RX760, PCV-RX755, PCV-RX554, PCV-RX790G, PCV-RX751, PCV-RX581, PCV-RX760P, PCV-RX551, PCV-RX770, PCV-RX552, PCV-RX753, PCV-RX730, PCV-RX770P, PCV-RX780, PCV-RX560, PCV-RX550, PCV-RX762, PCV-RX571, PCV-RX750, PCV-RX781, PCV-RX750P, PCV-RX752, PCV-RX780G, PCV-RX572, PCV-RX761, PCV-RX570, PCV-RX756