HD SDI is used to translate a digital video stream via a serial digital interface (SDI) using a simple BNC connector. With the HD SDI also ancillary data like timecode, embedded audio and metadata can be transferred additionally to the video stream.
HD SDI Single link is standardized in SMPTE 292 M. It provides a data rate of 1,4856 bit/s.
A dual link HD-SDI is an emerging interface consisting essentially of a pair of SMPTE 292M links, is standardized in SMPTE 372M. This provides a nominal 2.970 Gbit/s interface used in applications that require greater fidelity and resolution than standard HDTV can provide. A more recent interface, HD 3G-SDI, consisting of a single 2.970 Gbit/s serial link, is standardized in SMPTE 424M that will replace the dual link HD-SDI.
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