Draytek 200 manual WMM Configuration

4.6.9 WMM Configuration

WMM is an abbreviation of Wi-Fi Multimedia. It defines the priority levels for four access categories derived from 802.1d (prioritization tabs). The categories are designed with specific types of traffic, voice, video, best effort and low priority data. There are four accessing categories - AC_BE , AC_BK, AC_VI and AC_VO for WMM.

APSD (automatic power-save delivery) is an enhancement over the power-save mechanisms supported by Wi-Fi networks. It allows devices to take more time in sleeping state and consume less power to improve the performance by minimizing transmission latency. Such function is designed for mobile and cordless phones that support VoIP mostly.

WMM Capable	To apply WMM parameters for wireless data transmission,
	please click the Enable radio button.
APSD Capable	The default setting is Disable. Click Enable to enable the
	function of automatic power-save delivery (APSD).
Aifsn	It controls how long the client waits for each data
	transmission. Please specify the value ranging from 1 to 15.
	Such parameter will influence the time delay for WMM
	accessing categories. For the service of voice or video
	image, please set small value for AC_VI and AC_VO
	categories. As to the service of e-mail or web browsing,
	please set large value for AC_BE and AC_BK categories.
CWMin/CWMax	CWMin means contention Window-Min and CWMax
	means contention Window-Max. Please specify the value
	ranging from 1 to 15. Be aware that CWMax value must be
	greater than CWMin or equals to CWMin value. Both
	values will influence the time delay for WMM accessing
	categories. The difference between AC_VI and AC_VO
	categories must be smaller; however, the difference
	between AC_BE and AC_BK categories must be greater.
Txop	It means transmission opportunity. For WMM categories of
	AC_VI and AC_VO that need higher priorities in data
VigorFly 200 Series User’s Guide	113