airMAX - QoS and Prioritization


Overview


This article describes how QoS and prioritization is handled by airMAX.


Table of Contents


  1. Introduction
  2. Traffic Categories

Introduction


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QoS is enabled automatically in airMAX devices and there is no configuration necessary to enable QoS. In order for the devices to prioritize traffic properly, the traffic will need to have the 802.1p/DSCP/ToS value correctly configured prior to the traffic entering the airMAX equipment. The originating software or hardware device is responsible for applying these values, and only if these fields are set will traffic be prioritized in accordance with the traffic categories table below.

airMAX equipment supports three levels of priority: high, medium and low. These priority levels are exclusive priority queues; for example, all high traffic will be transmitted before any medium priority traffic, and so on. It is recommended that voice traffic be kept on the high priority queue, with high priority data traffic using the medium priority queue, and other applications configured to use low priority.


Traffic Categories


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There are three traffic categories: high, medium and low priority. By default, all traffic is classified as low priority, meaning there is no specific prioritization applied. The other categories can be defined with the following values. 802.1p/ToS/DSCP values which are not included in the table below are used for internal airMAX equipment control purposes:

802.1p Class of Service

TOS Range

DSCP Range

Traffic Category

0 - Best Effort

0x00-0x1f

0-7

Medium Priority

1 - Background

0x20-0x3f

8-15

Low Priority

2 - Spare

0x40-0x5f

16-23

Low Priority

3 - Excellent Effort

0x60-0x7f

24-25, 28-31

Medium Priority

4 - Controlled Load

0x80-0x9f

32-39

Medium Priority

5 - Video (<100ms latency)

0xa0-0xbf

40-45

Medium Priority

6 - Voice (<10ms latency)

0x68, 0xb8

26-27, 46-55

High Priority

7 - Network Control

0xe0-0xff

56-63

High Priority


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