TSL recently posted the below article to LinkedIn highlighting the ongoing use of MADI.

This is a format many newcomers to the industry may never have heard of but ove the last few years it seems to be having somewhat of a resurgence!

MADI was created in the 1990’s just as SDI was becoming common in Broadcast Facilities. It is a multiplex of 32 AES3(AES/EBU) digital audio signals (i.e. 64 channels) which was made to look electrically the same as SDI meaning it would pass through SDI distribution amplifiers and simple routers.  

You may also find MADI carried over fibre optic cables – for example between connection/interface unit in an apparatus room and an audio mixing desk in sound room.