Are you asking to get a digital output from a playing CD on the MKII ?.. didn't know that was possible, I thought only the Digital input of whatever other source is upsampled and then outputted via the BNC digital output..
BNC is used because its the best connection(I believe).
BNC is also certified to accepts and send digital audio conforming to the 75Ω S/PDIF digital interface standards and it offers the best and most secure connection. More equipment should have BNC as standard IMHO.
BTW, you can also get at your local Rat Shack gold BNC to RCA plugs.(adapter)
thanks
Matt
http://members.rogers.com/mzn50/