SMPTE 424M

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"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.[1] 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.[2] 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.

See also[edit]

References[edit]

  1. ^ SMPTE 292M
  2. ^ "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.