Got it. It's a protocol and a hardware solution.

Sony/
Phillips
Digitial
Inter
Face

Basically it requires a transmitter at one end, and a receiver/converter at
the other, if I'm reading it right. one hardware solution is to put rca
jacks on cat5 cable, and connect that way. It carries stereo on one wire,
and is a high fidelity solution. Ground loops are a problem.

I'm guessing the ASUS board has the transmitter integrated into it.

Does anybody use this in the home?

The article I found was about a professional audio studio.