In a NEXUS system, the XSDI board is provided to make available the audio embedded into an SDI digital serial video stream as specified by SMPTE-259M (SDI). In addition, any audio existing on the NEXUS system can be written to the video stream. The board features a video input and a video output. This allows any video to be transparently forwarded with no need for additional hardware components. Of course, it is also possible to use the XSDI as a pure input board for extracting (de-embedding) audio from a video signal. Unlike competing solutions, the XSDI was designed as a generic SDI audio interface. The board was developed from scratch. (Standard applications were not accessible during the development process.) It offers a variety of options for reading the audio from a video stream, or adding it to the video signal.