D-Link DWL-8500AP - AirPremier AG Wireless Switching 108 Dualband Access Point Administrator's Manual page 77

Table 22. QoS Settings
Field
cwMax
(Maximum Contention
Window)
Max. Burst Length
Wi-Fi MultiMedia
Description
The value specified for the Maximum Contention Window is the upper
limit (in milliseconds) for the doubling of the random backoff value.
This doubling continues until either the data frame is sent or the
Maximum Contention Window size is reached.
Once the Maximum Contention Window size is reached, retries will
continue until a maximum number of retries allowed is reached.
Valid values for cwMax are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1023.
The value for cwMax can be equal to or higher than the value for
cwMin.
For more information, see "Random Backoff and Minimum / Maximum
Contention Windows" on page 72.
The Max. Burst Length is an AP EDCA parameter and only applies to
traffic flowing from the access point to the client station.
This value specifies (in milliseconds) the maximum burst length
allowed for packet bursts on the wireless network. A packet burst is a
collection of multiple frames transmitted without header information.
The decreased overhead results in higher throughput and better
performance.
Valid values for maximum burst length are 0.0 through 999.
For more information, see "Packet Bursting for Better Performance"
page 73.
Wi-Fi MultiMedia (WMM) is enabled by default. With WMM enabled,
QoS prioritization and coordination of wireless medium access is on.
With WMM enabled, QoS settings on the access point control
downstream traffic flowing from the access point to client station (AP
EDCA parameters) and the upstream traffic flowing from the station to
the access point (station EDCA parameters).
Disabling WMM deactivates QoS control of station EDCA parameters
on upstream traffic flowing from the station to the access point.
With WMM disabled, you can still set some parameters on the
downstream traffic flowing from the access point to the client station
(AP EDCA parameters).
• To disable WMM extensions, click Disabled.
• To enable WMM extensions, click Enabled.
6 Configuring Access Point Services
Configuring Quality of Service (QoS)
on
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