Serial Digital Interface

SDI is the short-hand used within the video industry to describe the ITU R BT 601 standard for interface of component digital video. One component of luminance (with 720 samples per line), and two of color (each with 360 samples per line) are present, in what is called "4:2:2" sampling. There are either 10 or 8 bits per sample. The standard accommodates either "525" or "625" systems in the same 270 Mbps 75 ohm interface. There is a similar interface used for HDTV, with a data rate of 1.5 Gbps.