Applicable to all units.
Read-only for units with SW version 4.0 and higher.
In AU/BU: The transmit power in dBm defined for the applicable rate.
In SU/RB: If ATPC is disabled, this is the transmit power in dBm
defined for the applicable rate.
If ATPC is enabled, it serves as the initial transmit power in dBm
for the ATPC algorithm.
In SU/RB: The range is -10 dBm to the power value defined by
brzaccVLMaximumTxPower for the applicable modulation level.
In AU/BU: The range is -10 dBm to the power value defined by
brzaccVLMaximumTxPowerRange for the applicable modulation level.