Wireless AP with QOS enabled
Observer has sensed an AP on air that has the QOS (Quality of Service) feature enabled. Wireless QOS (which is not supported by all vendors) allows you to prioritize traffic for devices such as wireless VoIP phones.
Possible reasons for the event:
A rogue access point, or crosstalk from another network is being sensed by the analyzer.
An administrator has inadvertently left QoS disabled.