Digital Coaxial to Optical Converter, Bi-Directional Coax Digital Audio Converter Optical-to-Coaxial or Coax-to-Optical Digital Audio Converter AdapterBi-directional Audio Converter accepts SPDIF audio signal input through either Coaxial cable or Toslink cable, and passes the signal (as is) to both its coaxial and Toslink output ports. Coaxial Bidi..