Using Avid Artist | DNxIV for UltraHD/4K
22
Mapping of Quad SDI Outputs
2SI Mode
Two Sample Interleave is an alternative method to organize the data of SDI UltraHD and 4K formats.
Instead of dividing the picture raster into quadrants, this method samples pixels to create four lower
resolution versions of the entire picture. These are combined later to create the full resolution image.
Mapping of 2SI Outputs
For 2SI UltraHD or 4K SDI video at 30 fps or less, monitoring one of these four signals on a standard
SDI monitor displays the entire picture, but at a lower resolution. Above 30 fps, 3G bandwidth is
required, so a 3G capable monitor is required.
n
In some versions of AJA Control Panel, the 2SI method is referred to as '425' which is a reference to
the SMPTE 425 standard which defines this method.
2-Wire and 4-Wire Modes
Using higher data rates, it is possible to carry UltraHD and 4K signals on two SDI links, instead of
four. In this situation, half (two quarters) of the image data is carried on one link, with the other half
carried on the other link. These types of signals also cannot be viewed on a standard SDI monitor
using one connector.
You can choose 2-wire or 4-wire input and output (depending on the type of signal). If the number of
links selected is not sufficient, the number of links is automatically increased to accommodate the
signal. UltraHD or 4K SDI signals 30 fps and below can be input and output simultaneously, using
two connectors in each direction. However, all four connectors are required above 30 fps. You will be
