Cobalt Co9992-4ENC-4K-HEVC Software-Defined Broadcast Encoder - Manual (Page 91)

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SMPTE 2022 FEC Support
The 9992-ENC supports one FEC session per Ethernet port. A checkbox for SMPTE 2022 FEC
will be displayed if the feature is available. Once this feature is enabled for one of the streams in
a given Ethernet port, the checkbox will no longer be displayed.
Once the
SMPTE 2022 FEC box is checked, additional parameters become available for
configuration:

FEC Mode: If you select Column Only , the 9992-ENC will send a single FEC flow,
corresponding to the column protection data, using a UDP port number corresponding to
the media UDP port number plus 2. If you select
Row and Column , the 9992-ENCwill
send two FEC flows, the first corresponding to the column protection data, and the
second corresponding to the row protection data. The row protection data will be sent
using a UDP port number corresponding to the media UDP port number plus 4. Note that
not all receivers support Row and Column mode; such receivers will only use the FEC
Column data and discard the FEC Row data.

Columns: Number of columns in the FEC matrix. This variable must be between 1 and
20 if FEC Mode is set to Column Only , and between 4 and 20 if it is set to Row and
Column .

Rows: Number of rows in the FEC matrix. This variable must be between 4 and 20.

FEC Overhead: This field is updated as configuration is entered, and contains the
overhead for the selected FEC configuration. Note that not all parameter changes cause
the overhead to change. The FEC overhead is the sum of a Column overhead and a Row
overhead (which is zero if
FEC Mode is Column Only ). The overhead is a function of
the settings, as follows:
o Increasing the number of columns decreases the Row overhead (if enabled) and
does not change the Column overhead.
o Increasing the number of rows does not change the Row overhead and
decreases the Column overhead.
o Decreasing the number of rows and columns has the opposite effect as the
previous items.
The following constraints apply to the FEC function:

The number of rows must be between 4 and 20.

The number of columns must be between 1 and 20 for Column Only mode, or between 4
and 20 in Row and Column mode.