The SD-SDI to Composite Converter with Audio Embedding and Frame Sync is an expansion board the requires the 3RU version of the XIO-series rackmount frame. The card takes a single NTSC or PAL SD-SDI input and converts to one composite analog output. So the signal can pass to downstream devices without requiring a separate distribution amplifier, the SDI input is also looped back out on two mirrored outputs. Along with video, this converter will also embed two stereo pairs (4-channels) of analog audio into the SDI stream.