Hi J S Hyanki,
Input P1dB is +12.2 dBm when in standard power mode and +10.6 dBm when in low power mode.
The baseband output at the DUT is limited to 3 Vpp when not current limited (6 mApp per pin is the current limit).
Does putting -6 dBm into RFIN not product a +5 dBm at the baseband output?
Joel