ATM for Video and Audio on Demand David Greaves and Mark Taunton. Presented at the Audio Engineering Society Conference, March 1996 For many applications, audio is now conveyed digitally. Video applications are following fast, particularly for video-on-demand. These digital streams require constant-rate digital channels between the source and destination, but a great number of all networks being planned today are based on the packet switched Asynchronous Transfer Mode (ATM) technology. This paper serves as an introduction to ATM, with emphasis on its ability to carry fixed rate channels, and describes the approach of the Cambridge Digital Interactive Television Trial, where Video and Audio on demand are transported to the Home over ATM.