Product and Software: This article applies to ArubaOS 3.x.
Protection happens in the 2.4 Ghz band when an 11g capable AP is hearing a 802.11b client on the same channel. At this point, all 11g stations use a CTS/RTS and maximum TCP throughput for the 802.11g clients should decrease per specifications. 802.11b client throughput is unaffected.
You can check this by issuing the following command:
#show ap debug radio-stats ap-name 33.99.102 radio 0 | include Protection 11g Protection 0