Applicable to SU and AU.
For units bearing SW version 4.0 and above applicable to
BreezeNET-B products, for previous SW versions not applicable
to BreezeNET-B products.
The initial value to be used by the contention window calculation
algorithm.
Value must be 0 or power of 2 minus 1 (7,15,31...).
Range: 0 to 1023, excluding 1 and 3.
BreezeNET-B products with SW version below 4.0 return 65535.