Draytek Vigor2920n User's Guide download pdf (Page 285)

Vigor2920 Series User’s Guide

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sizes. It is used for improving MAC layer’s performance for

some brand’s clients. The default setting is Enable.

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.

WMM Capable

To apply WMM parameters for wireless data transmission,

please click the Enable radio button.

APSD Capable

The default setting is Disable.

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 For 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

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Draytek Vigor2920n User's Guide Page 285