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{{unreferenced|date=December 2013}}

'''Serial Data Transport Interface''' is a way of transmitting data packets over a [[serial digital interface]] (SDI) datastream. This means that standard SDI infrastructure can be used.

Developed to address the needs of the growing number of compressed video standards ([[DV (video format)|DV]], [[DVCPRO]], [[Betacam|BetaSX]], [[MPEG2]]) it allows lossless transfer of data to other devices which have the same codec, for example DV to DV or SX to SX.

Using a standard SDI transport, the extra data is placed within normal active video, between Start of Active Video (SAV), and End of Active Video (EAV). This gives 1440 10-bit words of data at {{nowrap|270 Mbit/s}} (1920 words in the 8-bit {{nowrap|360 Mbit/s}} standard).

If an SDTI stream is viewed using a standard SDI device, then the raw data can be seen as a small strip along the left-hand side (usually in purple). The DVCAM SDTI has video data at the top, control data in the middle ([[Timecode]], etc.) and audio at the bottom just like it is organised on the tape.

Because SDTI is used for compressed data the area used is less than a full screen; this allows for faster-than-real-time transfers.

SDTI is standardized as ''[[SMPTE]] 305M''. A {{nowrap|1.5 Gbit/s}} version, using the [[HDTV|high definition]] serial digital interface, is standardized as ''SMPTE 348M''.

==External links==
*[http://www.digitalpostproduction.com/Htm/Tutorials/WhatIsSDTI.htm Interconnectivity in the DTV Era The Emergence of SDTI]

[[Category:Serial digital interface]]
[[Category:Film and video technology]]
[[Category:Digital television]]

{{video-tech-stub}}

Serial Data Transport Interface - Revision history

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