In 4.2, the TX power settings can be configured in 3 ways like Static power settings on each IAP, ARM and in Radio profile.
Which power settings has higher priority in IAP?
Priority is like mentioned below.
1)Static tx power per-ap
2)Radio profile on per-radio
3)ARM profile on all-radio
First the IAP will use static configuration. If there is no static power settings, it will assign it from Radio profile. If there is no static or Radio profile power settings configured, then it will assign power from ARM profile.