Compex Technologies NP25G 6C - Manual (Page 33)

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Set Wireless Multimedia
Wireless Multimedia (WMM) is a QoS (Quality of Service) standard in
IEEE802.11E that we have adopted to improve and support the user
experience for multimedia, video, and voice applications by prioritizing
data traffic. QoS can be realized through 4 different Access Categories
(AC). Each AC type consists of an independent transmit queue, and a
channel access function with its own parameters.