SMPTE ST 425-3 PDF

This standard defines 1080-line and 2160-line mapping formats as described below;

1080-line mapping specifies:

The mapping of the image formats of 1920 × 1080 and 2048 × 1080 pixels listed in Table 2 into four parallel 10-bit data streams (known as data stream one, data stream two, data stream three and data stream four) of a 40-bit virtual interface, followed by the mapping of these four 10-bit data streams onto the Dual Link 3 Gb/s Serial Interface (3G-SDI Link 1 and Link 2) via two 20-bit virtual interfaces.

2160-line mapping specifies:

The mapping of the image formats of 3840 × 2160 and 4096 × 2160 pixels listed in Table 3 into four parallel 10-bit data streams (known as data stream one, data stream two, data stream three and data stream four) of a 40-bit virtual interface, followed by the mapping of these four 10-bit data streams on to the Dual Link 3 Gb/s Serial Interface (3G-SDI Link 1 and Link 2) via two 20-bit virtual interfaces.

This standard also defines the carriage of ancillary data such as the audio data, the audio control packets, the payload identifier and the time code.

It is not necessary for implementations to include support for all formats that are included in this standard. Implementers should indicate supported formats in commercial publications.