Autonomous : Power local ofdm / cck
It’s possible to have different powerlevels for different kind of data rates.
That’s because there is a command power local at the Autonomous AP.
BR1(config-if)#power local ?
cck Set local power for CCK rates
ofdm Set local power for OFDM rates
cck = 802.11b
ofdm = 802.11g for datarates 6,12,18,24,36,48,54
Datarates 5.5 and 11 uses cck.
Datarates 1 and 2 uses DBPSK/DQPSK+DSS.