XANTECH CPLTCX OPTICAL-TO-COAXIAL DIGITAL AUDIO COUPLER, CONVERTS DIGITAL AUDIO SIGNALS FROM OPTICAL-TO-COAXIAL FORMAT; COMBINES WITH THE COAXIAL-TO-OPTICAL DIGITAL AUDIO COUPLER TO PROVIDE A LONG-DISTANCE ALTERNATIVE USING LOWER-COST COAXIAL CABLE; RACK-MOUNTABLE; INCLUDES POWER SUPPLY