FS3 Frame Synchronizer/Converter v1.1r1 96 www.aja.com
standard, it became possible to send these larger raster images over just two
cables, the first carrying SDI1 and SDI2, the second carrying SDI3 and SDI4.
Different data packing methods are again possible. The first approach for 4K/
UltraHD video is called Square Division (Quadrant), which divides the raster into
four parts, (upper left, upper right, lower left, lower right) and transports each
quadrant’s data over a separate link. This, however, made it impossible to view
the entire image on one link, and also caused issues when processing the divided
image. Another way to pack the data is called Two Sample Interleave (2SI) which
divides the image data into smaller groups of pixels from two lines. The result is
four lower resolution complete images that are carried on each of the four SDI
links. This makes it possible to monitor the entire image on just one of the links,
though at lower resolution.
FS3 SDI Formats
The FS3 can create the following different types of 4K/UltraHD video data
structures:
High Frame Rate (1080p above 30fps)
• 3G Level A (four cables, Quadrant)
• 3G Level A (four cables, 2SI)
• 3G Level B-DL (four cables, Quadrant)
• 3G Level B-DL (four cables, 2SI)
Low Frame Rate (1080p 30fps and below)
• 3G Level B-DS (two cables, Quadrant)
• 3G Level B-DS (two cables, 2SI)
• Quad 1.5G (four cables, Quadrant)
• Quad 1.5G (four cables, 2SI)
Regardless of whether Quadrant or 2SI data packing is used, each of these SDI
links can carry 8 digital audio channel pairs, bringing the total number 4K and
UltraHD embedded audio channels to 64.