Asynchronous Serial Interface - (ASI) - (1) A streaming format like a MPEG Transport Stream. It can contain a single program or be a multiplex of multiple programs, each consisting of video and audio.

(2) Equipment with an interface which is compliant with the DVB Asynchronous Serial Interface as defined in DVB document A010 (Interfaces for CATV/SMATV Headends and Similar professional equipment). (This is a 2002 definition which may need updating.)