Column only: If enabled, SMPTE 2022-1 Level A; disabled, Level B. Level A
sends only one FEC stream, so only single packets are recovered. The
overhead is smaller than for Level B. For Level B, in addition, several
consecutive packets can be restored (it is at most as many as for “Size of
matrix” set). Overhead in %: Depends on the matrix size, see table.
Overhead: The spectrum additionally required when FEC is turned on. If the
bandwidth is set to 100 Mbit (= 40% overhead), and a 5x5 matrix increases
the total bandwidth to 140 Mbit, the overhead is calculated as follows:
Column only switched on:
Overhead = 1 / "size of matrix"
= For example size of matrix = 5, overhead = 1/5 = 0.2
Column only off:
Overhead = ("size of matrix" + "size of matrix") / ("size of matrix" * "size of
matrix")
= For example size of matrix = 5, overhead = (5 +5) / (5 * 5) = 0.4
