I did a scan using the airmagnet WiFi anaylizer and it informed me that the one of the alarms is the following AP PHY Data Rate Anomaly: APs are using data rates of 48M, 54,M which is not included in the user defined data that is allowed in the system. I checked the controller and I have both those data rates enabled?
So the only problem you have is the AirMagnet alarm?
I never worked personally with AirMagnet but you better check the settings if there are defined data rates?
I think the message says the AP has 48 and 54 Mbps data rates enabled while the AirMagnet is not configured to allow those data rates.
Just an idea. hope it helps.