Multichannel Audio Digital Interface. Sometimes erroneously called the “Musical Audio Digital Interface.” A professional multichannel version of AES/EBU standard for transmitting up to 56 channels of digital audio data over a single coaxial cable terminated with BNC connectors . MADI uses a second cable for word clock, with a fixed data rate of 100Mbps used on large, open-reel digital multitracks. Optical MADI implementations are available.