"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 two formats known as Level A and Level B. The Level A format is a fullformat transport of a 1920 x 1080 progressive frame with the framerate of 50 or 60 Hz. The Level B format is a multiplexing scheme where two streams of 1920 x 1080 interlaced 50 / 60 Hz video is transported over a 3G SDI link. Today (spring 2013) several manufacturers are supporting only one or the other. Best known example is Sony Cameras who 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
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