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Digital Coaxial audio signals and Optical Toslink Digital audio signals are two variations of the same S/PDIF standard
The hassle comes when you have some equipment that use s Digital Coaxial and other equipment that use s Toslink; In this case you need to adapt one signal type to the other type
This adapter converts the optical Toslink input signal into an electrical Digital Coaxial output
It has a small footprint less than 3" x 2" which makes it easy to hide behind your equipment rack