This module is our S/PDIF interface module. Around since the eighties, S/PDIF has been the universal interface and is sent over optical, coaxial, or differential cabling. This interface is limited in both sample rate, supported data formats, and bit depth. Toslink, Coaxial, and Balanced digital interfaces are most commonly asynchronous unless a separate clock feedback channel is added to the transport or server. In all of our DACs, we provide the best isolation possible the format allows, helping prevent most electrical noise from coupling from the transport.