The MAC is typically linked to the PHY by a four-bit 25 MHz synchronous parallel interface known as a media-independent interface (MII), or by a two-bit 50 MHz variant called reduced media independent interface (RMII).
MAC може да биде поврзан со PHY со 4 бита 25 MHz синхронен паралелен интерфеј познат како Media Independent Interface (MII) или со 2 бита 50 MHz варијанта на Reduced Media Independent Interface (RMII).