SW Version 2.04 30-January-2009 Page 80 of 128
Figure 61 IP FEC configuration
FEC Mode Forward error correction (FEC) mechanism that can be used
to correct errors than can occur during the transport.
COP3 Level A: Use FEC Columns only. Protects against Burst
loss.
COP3 Level B: Use both FEC Columns and Rows. Provides
an additional protection against Random Packet Loss.
A FEC matrix is generated and transmitted on two separate
UDP ports:
FEC columns on UDP port + 2
FEC rows on UDP port + 4
The importance of this is that when FEC is enabled it is
important the UDP ports reserved for the FEC system is not
occupied by other traffic.
Dimensions (LxD) The FEC matrix , L=Columns, D= Rows
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