Cisco AP541N-A-K9 Administration Guide - Page 104

Wireless, Queue, Inter-Frame Space, cwMin, Minimum, Contention Window, Table 24

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4 Wireless Configuring Quality of Service (QoS) Table 24 QoS Parameters (Continued) Field Description Station EDCA Parameters Queue 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). AIFS The Arbitration Inter-Frame Spacing (AIFS) specifies a (Inter-Frame Space) wait time for data frames. The wait time is measured in slots. Valid values for AIFS are 1 through 255. cwMin This parameter is used by the algorithm that determines (Minimum the initial random wait time for data transmission during a Contention Window) 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. 101 Cisco AP 541N Dual-band Single-radio Access Point Quick Start Guide

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Wireless
Configuring Quality of Service (QoS)
101
Cisco AP 541N Dual-band Single-radio Access Point Quick Start Guide
4
Station EDCA Parameters
Queue
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).
AIFS
(Inter-Frame Space)
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.
cwMin
(Minimum
Contention Window)
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.
Table 24
QoS Parameters (Continued)
Field
Description