Number of bytes currently in the transmission window (LBT-RM only)

- n (Int32)
- Statistics set index

Number of bytes currently in the transmission window

Number of bytes currently in the transmission window.
Typically, this count approaches its window size or exceeds it by a small
amount.
See transmissionWindowMessages for a description of the
transmission window.
This method returns a value from the nth set of statistics
encapsulated within this object.