SMPTE 259M
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SMPTE 259M is a standard published by SMPTE which "describes a 10-bit serial digital interface operating at 143/270/360Mb/s."
The goal of SMPTE 259M is to define a serial digital interface (based on a coaxial cable), called SDI or SD-SDI.
There are 4 bit rates defined, which are normally used to transfer the following standard video formats:
| Variant | Bit rate | Aspect ratio | Total lines (per frame) | Active pixels (per line) | Active lines | Frame rate |
|---|---|---|---|---|---|---|
| SMPTE 259M-A | 143 Mbit/s | 4:3 | 525 | 768 | 486 | 59.94i |
| SMPTE 259M-B | 177 Mbit/s | 4:3 | 625 | 948 | 576 | 50i |
| SMPTE 259M-C | 270 Mbit/s | 4:3 or 16:9 | 525 | 720 | 486 | 59.94i |
| SMPTE 259M-C | 270 Mbit/s | 4:3 or 16:9 | 625 | 720 | 576 | 50i |
| SMPTE 259M-D | 360 Mbit/s | 16:9 | 525 | 960 | 486 | 59.94i |