Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

4-103
Wireless Local Area Networks (WLANs)
Traffic Management (QoS)
Figure 4-60. Editing Station EDCA (WMM) Parameters
3. View the SSID and Access Category settings to verify that you are config-
uring the correct queue. In Figure 4-60, the Best Effort queue (queue 1) in
MyWLAN is being customized.
4. Enter the desired values in the AIFSN, Transmit Ops, CW Minimum, and CW
Maximum fields.
The values for the AIFSN and Transmit Ops are in ms. The CW Min and CW
Max values are determined by raising 2 to the power of the value in the
corresponding field and subtracting one. For example, if you enter 4 in
the CW Minimum field, the CW Min value is 15. (Setting the CW Min and
CW Max values in this way forces you to specify values allowed by WMM.)
Again, take great care in establishing these settings. ProCurve Networking
cannot guarantee any behavior. However, you can keep these tips in mind:
• The lower the AIFSN and the CW minimum values, the lower the
latency for traffic in the queue, and in a congested network, the higher
the throughput. In a congested network, raising the AIFSN or the CW
minimum of low-priority queues can improve QoS for high-priority.
Raising the AIFSN value a certain amount sometimes has a more
dramatic effect than raising the CW value the same amount. However,
raising either value too high can starve out low-priority traffic.