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Configuring QoS 157
8 Configuring Advanced Settings
Table 55 describes the QoS settings you can configure.
Table 55. QoS Settings
Field Description
Queue 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).
AIFS
(Inter-Frame Space)
The Arbitration Inter-Frame Spacing (AIFS) specifies a wait time (in
milliseconds) for data frames.
Valid values for AIFS are 1 through 255.
cwMin
(Minimum Contention
Window)
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
”.
cwMax
(Maximum Contention
Window)
The value specified here in 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 the “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”.