Cisco Cisco AP541N Wireless Access Point Manuel De Maintenance

Configuring Quality of Service (QoS)

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Cisco AP541N Dual-band Single-radio Access Point Quick Start Guide

After you configure the QoS settings, you must click Apply to apply the changes 
and to save the settings. Changing some settings might cause the access point to 
stop and restart system processes. If this happens, wireless clients will temporarily 
lose connectivity. We recommend that you change access point settings when 
WLAN traffic is low. 

The value specified here in the 

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.

The TXOP Limit is a station EDCA parameter and only 
applies to traffic flowing from the client station to the 
access point. The Transmission Opportunity (TXOP) is an 
interval of time, in milliseconds, when a client has the right 
to initiate transmissions towards the access point. The 
TXOP Limit maximum value is 65535.

Select On to specify that the access point should not 
acknowledge frames with QosNoAck as the service class 
value.

Select On to enable Automatic Power Save Delivery 
(APSD), which is a power management method. APSD is 
recommended if VoIP phones access the network through 
the access point.