D-Link DWL-3500AP Administration Guide - Page 77

cwMax, Maximum Contention, Window, Max. Burst Length, Wi-Fi MultiMedia, Disabled, Enabled, QoS

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6 Configuring Access Point Services 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" on 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. Configuring Quality of Service (QoS) 77

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Configuring Quality of Service (QoS)
77
6
Configuring Access Point Services
cwMax
(Maximum Contention
Window)
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.
Max. Burst Length
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”
on
page 73.
Wi-Fi MultiMedia
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
.
Table 22.
QoS Settings
Field
Description