Io 4K Plus Capture, Display, Convert v14.0r2 18 www.aja.com
Besides single link transport, Io 4K Plus also supports the following multiple link
transport modes for UltraHD and 4K:
• Quadrant 4-wire (transported on four links)
• Quadrant 2-wire (transported on two links)
• 2SI (two or four links automatically selected)
The amount of data in the signal affects the number of links and data rates
necessary to carry that signal.
Quadrant Mode
In Quadrant Mode you can use four HD or 2K signals (1.5G) to input / output
UltraHD or 4K at 30fps or below, or four 3G signals to enable HFR and / or deep
color. Whether using four 1.5G or four 3G wires, each represents individual
quadrants of the higher definition UltraHD 3840x2160 or 4K 4096x2160 4K
formats. Physical connections of the quadrants will be mapped to the SDI
connectors as shown. Monitoring one of these HD signals on a standard SDI
monitor will display one quadrant of the picture.
Figure 6. 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.
Figure 7. 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.”
NOTE: 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.