D-Link DWC-1000 User Manual page 115

Section 4 - Advanced WLAN Configuration
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Field
AP Profile
Radio Mode
Template
Queue
AIFS (Inter-Frame Space)
cwMin (Minimum
Contention Window)
D-Link DWC-1000 User Manual
The name of AP Profile
The radio mode. 802.11a/n or 802.b/g/n
Select the QoS template to apply to the AP profile. If you select Custom, you can change
the AP and station parameters. If you select Voice or Factory Default, the wireless
controller will use the pre‐defined settings for the respective template.
AP EDCA Parameters
Queues are defined for different types of data transmitted from AP‐to‐station:
• Data 0 (Voice)—High priority queue, minimum delay. Time‐sensitive data such as
VoIP and streaming media are automatically sent to this queue.
• Data 1(Video)—High 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).
The Arbitration Inter‐Frame Spacing (AIFS) specifies a wait time for data frames. The wait
time is measured in slots. Valid values for AIFS are 1 through 255.
This parameter is input to the algorithm that determines the initial random backoff
wait time (window) for retry of a transmission. The value specified here in the Minimum
Contention Window is the upper limit (in milliseconds) of a range from which the initial
random backoff wait time is determined.
The first random number generated will be a number between 0 and the number
specified here.
If the first random backoff wait time expires before the data frame is sent, a retry counter is
incremented and the random backoff value (window) is doubled. Doubling will continue
until the size of the random backoff value reaches the number defined in the Maximum
Contention Window.
Valid values for the 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.
Description
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