Cisco WAP581 Administration Manual page 70

QoS
• Data 3 (Background) — Lowest priority queue, with high throughput. Bulk data that requires maximum throughput
and is not time-sensitive is sent to this queue (FTP data, for example).
Step 4
Check Enable to enable Wi-Fi MultiMedia (WMM) extensions.
Wi-Fi MultiMedia (WMM)— This field is enabled by default. With WMM enabled, QoS prioritization and coordination
of wireless medium access is on. With WMM enabled, QoS settings on the WAP device control downstream traffic
flowing from the WAP device to client station (AP EDCA parameters) and the upstream traffic flowing from the station
to the AP (station EDCA parameters).
Disabling WMM deactivates QoS control of station EDCA parameters on upstream traffic flowing from the station to
the WAP device. With WMM disabled, you can still set some parameters on the downstream traffic flowing from the
WAP device to the client station (AP EDCA parameters).
Step 5 Configure the following WAP EDCA and Station EDCA parameters:
• Arbitration Inter-Frame Space — Wait time for the data frames. The wait time is measured in slots. Valid values
for AIFS are 1 through 255.
• Minimum Contention Window — An input to the algorithm that determines the initial random backoff wait time
(window) for a retry of a transmission failure.
This value is the upper limit (in milliseconds) of a range from which the initial random backoff wait time is determined.
The first random number generated is 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 continues until the size of the random backoff value reaches the number defined in the Maximum
Contention Window.
Valid values are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1023. This value must be lower than the value for the Maximum
Contention Window.
• Maximum Contention Window — 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.
After the Maximum Contention Window size is reached, retries continue until a maximum number of retries allowed
is reached.
Valid values are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1023. This value must be higher than the value for the Minimum
Contention Window.
• Maximum Burst — A WAP EDCA parameter that applies only to traffic flowing from the WAP to the client station.
This value specifies (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 are 0.0 through 999.
• TXOP Limit (Station only) — The TXOP Limit is a station EDCA parameter that only applies to traffic flowing
from the client station to the WAP device. The Transmission Opportunity (TXOP) is an interval of time, in
milliseconds, when a WME client station has the right to initiate transmissions onto the wireless medium (WM)
towards the WAP device. The TXOP Limit maximum value is 65535.
Step 6
Configure the following additional settings:
• No Acknowledgement — Check Enable to specify that the WAP device should not acknowledge frames with
QosNoAck as the service class value.
Cisco WAP581 Wireless-AC/N Dual Radio Access Point with 2.5GbE LAN Administration Guide
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Wireless