Knowledgebase
How to Configure WMM QoS In Vigor Routers
Posted by on 02 February 2012 03:59 PM

VMM is supported in the 2710 and 2820 Series wireless routers. To enable WMM go to “Wireless LAN >> WMM Configuration” menu configuration page. Select Enable for “WMM Capable”.

To switch on APSD (Automatic Power-Save Delivery) mode, select Enable for APSD Capable.

 http://www.draycare.com.au/dfaq/image/WLAN/08/WLAN_16.JPG

It is best to leave configuration parameters at the default values for best performance.  If you want to modify these parameters, please refer to the Wi-Fi WMM standards specification.

 

Note: Changing these values can lead to unexpected results on your wireless LAN, which may be difficult to troubleshoot. If you do change these values and find that you need to reset the values factory default settings then click on “Set to Factory Default” link in the configuration menu.

 


 

Meaning of Each of the WMM Configuration Parameters

 

Aifsn (Arbitration Inter-Frame Spacing):

 

Controls how long the client waits for each data transmission.

The AIFs ensures that multiple access points do not try sending data at the same time but instead wait until a channel is free.

Values range from 1 to 15 milliseconds and these values influence the time delay for WMM accessing categories.

For voice or video (AC_VO, AC_VI) set small values

For e-mail or web browsing (AC_BK, AC_BE) set large values.

 

 

CWMin/CWMax CWMin (Minimum / Maximum Contention Windows):

 

It is used to determine the amount of time to wait before attempting to access a given channel, when it is detected that the wireless medium is busy

 

Values range from 1 to 15 milliseconds. CWMax value must be greater

than or equal to CWMin.

 

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  (Transmission Opportunity):

 

This is an interval of time when a WMM client station has the right to initiate transmissions onto the wireless network.

Values ranging from 0 to 65535 milliseconds.

 

For WMM categories AC_VI and AC_VO needing a higher priority in data transmission, set these to a higher value to get highest transmission opportunity.

 

 

ACM (Admission Control Mandatory)

 

It is used to restrict stations from using a specific category class

This option is enabled by checking the tick box.

 

 

AckPolicy

 

Uncheck” (default value) means the AP router will answer the response request while transmitting WMM packets through the wireless connection. It ensures  that the peer must receive the WMM packets.

“Checked”  means the AP router will not answer any response request for the transmitting packets. It will give better performance with lower reliability.

 

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