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D-Link DWL-6620APS Manual

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Unied Access Point Administrator’s Guide
Unied Access Point Administrator’s Guide
Page 75
October 2017
Section 5 - Conguring Access Point Services
Field Description
cwMin (Minimum
Contention Window)
This parameter is input to the algorithm that determines the initial random back off wait time
(window) for retry of a transmission.
The value specied for Minimum Contention Window is the upper limit (in milliseconds) of a
range from which the initial random back off wait time is determined.
The rst random number generated will be a number between 0 and the number specied
here.
If the rst random back off wait time expires before the data frame is sent, a retry counter
is incremented and the random back off value (window) is doubled. Doubling will continue
until the size of the random back off value reaches the number dened in the Maximum
Contention Window.
Valid values for cwMin are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The value for cwMin
must be lower than the value for cwMax.
cwMax (Maximum
Contention Window)
The value specied for the Maximum Contention Window is the upper limit (in milliseconds)
for the doubling of the random back off 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 1024. The value for cwMax
must be higher than the value for cwMin.
Max. Burst Length The Max. Burst Length is an AP EDCA parameter and only applies to trafc owing from
the AP to the client station.
This value species (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.
Wi-Fi Multimedia (WMM) Settings
Wi-Fi MultiMedia
(WMM)
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
UAP control downstream trafc owing from the AP to client station (AP EDCA parameters)
and the upstream trafc owing from the station to the AP (station EDCA parameters).
Disabling WMM deactivates QoS control of station EDCA parameters on upstream trafc
owing from the station to the AP.
With WMM disabled, you can still set some parameters on the downstream trafc owing
from the AP to the client station (AP EDCA parameters).
To disable WMM extensions, click Disabled.
To enable WMM extensions, click Enabled.
Station EDCA Parameters
Queue Queues are dened for different types of data transmitted from station-to-AP:
•) Data 0 (Voice) — Highest priority queue, minimum delay. Time-sensitive data such as
VoIP and streaming media are automatically sent to this queue.
•) Data 1(Video) — Highest priority queue, minimum delay. Time-sensitive video data is
automatically sent to this queue.
•) Data 2 (Best Effort) — Medium priority queue, medium throughput and delay. Most
traditional IP data is sent to this queue.
•) Data 3 (Background) — Lowest priority queue, high throughput. Bulk data that
requires maximum throughput and is not time-sensitive is sent to this queue (FTP
data, for example).
AIFS (Inter-Frame
Space)
The Arbitration Inter-Frame Spacing (AIFS) species a wait time for data frames. The wait
time is measured in slots. Valid values for AIFS are 1 through 255.
… 75 …


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