User Manual of WDAP-C1750
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Configuring WMM consists of adjusting parameters on queues for different categories of wireless traffic. Traffic is
sent to the following queues:
Object Description
Background Low Priority High throughput, non time sensitive bulk data e.g. FTP
Best Effort Medium Priority Traditional IP data, medium throughput and delay.
Video High Priority Time sensitive video data with minimum time delay.
Voice High Priority Time sensitive data such as VoIP and streaming media
with minimum time delay.
Queues automatically provide minimum transmission delays for video, voice, multimedia and critical applications.
The values can further be adjusted manually:
Object Description
CWMin
Minimum Contention Window (milliseconds): This value is input to the initial random
backoff wait time algorithm for retry of a data frame transmission. The backoff wait time
will be generated between 0 and this value. If the frame is not sent, the random backoff
value is doubled until the value reaches the number defined by CWMax (below).
Valid values are 1,3,7,15,31,63,127,255,511 or 1024.
The CWMin value must be lower than the CWMax value. The contention window
scheme helps to avoid frame collisions and determine priority of frame transmission. A
shorter window has a higher probability (priority) of transmission.
CWMax
Maximum Contention Window (milliseconds): This value is the upper limit to random
backoff value doubling (see above).
Valid values are 1,3,7,15,31,63,127,255,511 or 1024.
AIFSN
Arbitration Inter-Frame Space (milliseconds): Specifies additional time between when a
channel goes idle and the AP/client sends data frames. Traffic with a lower AIFSN
value has a higher priority.
TxOP
Transmission Opportunity (milliseconds): The maximum interval of time an AP/client
can transmit. This makes channel access more efficiently prioritized.
A value of 0 means only one frame per transmission.
A greater value effects higher priority.
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