Newtec M6100 - Page 134

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Data Interfaces M6100 Broadcast Satellite Modulator
• L = the period or space between the non-consecutive packets or the amount of columns in the
matrix;
• D = defines the amount of rows in the matrix.
When the transport streams are aligned in the matrix the XOR function is applied to compute the
FEC packets per column and row.
The FEC packets that are calculated in the columns deal with consecutive burst packet loss and this
up to L packets. This FEC is used for correcting packet burst errors and random errors.
The FEC packets that are calculated in the rows deal with non-consecutive packet loss. It corrects
single packet loss within a row of TS packets. This is used to correct random packet errors.
The combination of two dimensions (FEC streams) is used to realise a higher
performance/correction capability then one single FEC stream.
The FEC streams must be transported separately on different UDP ports. The following matrix
provides an overview of the transmission of the following:
• TS packets are transported on port n;
• The FEC column packets are transmitted on port n+2;
• The FEC row packets are transmitted on port n+4.