"James Lehman" wrote ...
Is it correct to assume that there can be a direct translation
between coaxial digital and TOS Link optical? If so, what
is the best choice for price, simplicity and performance?

I am looking at a sound card that has coaxial in and out,
but I need TOS Link.

The data stream on S/PDIF and on TOSlink are the same.
Converters in either direction are available many places,
even Radio Shack, etc.