"SMPTE 424M" is a standard published by SMPTE which expands upon SMPTE 259M, SMPTE 344M, and SMPTE 292M allowing for bit-rates of 2.970 Gbit/s and 2.970/1.001 Gbit/s over a single-link coaxial cable. These bit-rates are sufficient for 1080p video at 50 or 60 frames per second. The signal formats carried over SMPTE 424M are specified in SMPTE 425M.
Within this standard there are three formats known as Level A, Level B Dual Link (B-DL) and Level B Dual Stream (B-DS). The Level A format is the direct mapping of uncompressed 1080p (up to 60 fps) video into a serial digital interface at the nominal 3 Gbit/s. The Level B-DL format is the mapping of dual-link HD-SDI/SMPTE 372M (i.e.: 1080p up to 60 fps) in a single serial digital interface at the nominal 3 Gbit/s. The Level B-DS format is the dual-stream carriage of two independent HD-SDI/SMPTE 292M signals (720p up to 60 fps or 1080i/1080p up to 30 fps) in a single serial digital interface at the nominal 3 Gbit/s. As of spring 2013, several manufacturers only support one or the other. The best known example are Sony Cameras that only support 3G SDI Level B.
This standard is part of a family of standards that define a Serial Digital Interface; it is commonly known as 3G-SDI.
- SMPTE 292M
- "Advice on the use of 3 Gbit/s HD-SDI interfaces". European Broadcasting Union (EBU) Technology & Innovation Department. Geneva. July 2011. pp. 7, 17–20, 23–24, 27. Retrieved 26 April 2014.
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