This object specifies the initial number of FEC redundancy
bytes the ATU-C appends to downstream frames transmitted over
the interleaved channel during the training sequence. The
ATU-C can fallback from this value depending on the aggregate
data rate achieved during training.
It is desirable to choose a large FEC size, thereby increasing
the chance of being able to correct errors in the data delivered
by a frame. However, additional FEC redundancy bytes increases
frame overhead, and thus frame latency.
The value of this object must be a integral multiple of the
value of cAdslAtucDmtConfCodewordSize.