high definition serial digital interface (SDI) (HD-SDI)

High Definition Serial Digital Interface(HD- SDI) is a digital video interface directly related to Serial Digital Interface (SDI) and standardized by the Society of Motion Picture and Television Engineers( SMPTE) under SMPTE 252M.

HD-SDI is based on ITU-R BT.709 and is used in conjunction with high-definition digital video. The image resolution corresponds to 720p and 1,080p. Transmission takes place without delay over a coaxial RG-59 cable over a distance of up to 100 m.

Data rates for the Serial Digital Interface (SDI) for the different video formats

HD-SDI supports the nominal data rate of 1.485 Gbit/s resulting from the serialization of the uncompressed HDTV signal and is used for pairwise connections specified under SMPTE 372M. The resulting data rate is thus 2.970 Gbit/s and is used in high-definition video applications such as in D-Cinema or in television studios.

High Definition Serial Digital Interface is used in video surveillance. An alternative concept to HD-SDI is High Definition Composite Video Interface( HDCVI).