Cisco Cisco AP541N Wireless Access Point Manual De Mantenimiento

Configuring Quality of Service (QoS)

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

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Queues are defined for different types of data transmitted 
from station-to-AP:

Data 0 (Voice)—Highest priority queue, minimum delay. 
Time-sensitive data such as VoIP and streaming media are 
automatically sent to this queue.

Data 1(Video)—Highest 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).

The Arbitration Inter-Frame Spacing (AIFS) specifies a 
wait time for data frames. The wait time is measured in 
slots. Valid values for AIFS are 1 through 255.

This parameter is used by the algorithm that determines the 
initial random wait time for data transmission during a 
period of contention for access point resources. The value 
specified here in the Minimum Contention Window is the 
upper limit from which the initial random backoff wait time 
will be determined. The first random number generated will 
be a number between 0 and the number specified here. If 
the timer expires before the data frame is sent, a retry 
counter is incremented and the random backoff value is 
doubled. Doubling will continue until the size of the random 
backoff value reaches the number defined in the Maximum 
Contention Window.