The term PAL is often used informally to refer to a 625-line\/50 Hz ( 576i , principally European ) television system , and to tell it apart from a 525-line\/60 Hz ( 480i , principally North American\/Central American\/Japanese ) NTSC system . The term PAL is often used informally to refer to a 625-line\/50 Hz ( 576i ) television system , and to differentiate from a 525-line\/60 Hz ( 480i ) NTSC system .