Coax to BNC connection for digital

As an additional thought, I could use a coax output from DVD player with RCA cable and a RCA/BNC adapter as opposed to a toslink cable. Thoughts anyone?

That should work well, Mesch, assuming the BNC input is 75 ohms (as is likely) and not 50 ohms.  Also, it would be preferable to use an adapter specified as 75 ohms, such as the one I linked to earlier.

Best regards,
-- Al

Thanks again Al for your help! That said, I am embarrassed in that I was mistaken about the additional input being BNC when in fact it is AES. My only excuse for my confusion is that I haven't received the DAC yet, a poor platform indeed. 

So I now must explore the subject of going from a coax RCA
 output to an AES input. 

I still can't believe that in my mind I replaced the AES outlet available on the DAC with a BNC one. AT 70 I feel I am in good physical shape, however my mind may not be keeping up.  

After some exploration I believe I am best off looking for a streamer/server with AES output and use appropriate 110 ohm XLR cable. This will be a 'down the road' investment. 

Actually some equipment provides an AES/EBU interface on a BNC connector, with a 75 ohm impedance!

From this Wikipedia writeup:

AES/EBU can also be run using unbalanced BNC connectors with a 75-ohm coaxial cable. The unbalanced version has a maximum transmission distance of 1000 meters as opposed to the 100 meters maximum for the balanced version. The AES-3id standard defines a 75-ohm BNC electrical variant of AES3. This uses the same cabling, patching and infrastructure as analogue or digital video, and is thus common in the broadcast industry.

Best regards,
-- Al