Product and Software: This article applies to all Aruba controllers and ArubaOS 3.x.
An AP with two radios can switch to an AM in one band while continuing to service the other band as an AP depends on the number of co-channel APs seen by the current AP.
Collectively, if the channel of operation has enough coverage (> acceptable coverage index), no active clients are connected, and the AP is not an edge AP, the AP should convert to an AM if mode-aware ARM is enabled.
For dual radio APs, mode-aware ARM operates independently on each radio. Typically, you will see 'g' radios converting to AMs first, because only three channels are available for operation.