Modem port board for 1.33GHz, 1.5GHz & 1.67GHz (1280x854 screen) models of the 15" Aluminium PowerBook G4. This part will not work with the dual layer Superdrive version (1440x960 screen) of the 1.67GHz PowerBook. This board comprises the rj11 telephone socket and an integral cable which connects to the modem board.