Psion Teklogix 9160 G2 Manual de usuario descargar pdf (Pagina 211)

Chapter 19: Quality Of Service (QoS)

Understanding QoS

Psion Teklogix 9160 G2 Wireless Gateway User Manual 187

Quality of Service (QoS) provides you with the ability to specify parameters on multiple

queues for increased throughput and better performance of differentiated wireless traffic like

Voice-over-IP (VoIP), other types of audio, video, and streaming media, as well as tradi-

tional IP data over the 9160 G2 Wireless Gateway.

The following sections describe how to configure Quality of Service queues on the 9160 G2

Wireless Gateway.

19.1 Understanding QoS

A primary factor that affects QoS is network congestion due to an increased number of

clients attempting to access the air waves and higher traffic volume competing for band-

width during a busy time of day. The most noticeable degradation in service on a busy,

overloaded network will be evident in time-sensitive applications like Video, Voice-over-IP

(VoIP), and streaming media.

Unlike typical data files which are less affected by variability in QoS, Video, VoIP and

streaming media must be sent in a specific order at a consistent rate and with minimum

delay between Packet transmission. If the quality of service is compromised, the audio or

video will be distorted.

19.1.1 QoS And Load Balancing

By using a combination of load balancing (see Chapter 18: “Load Balancing”) and QoS

techniques, you can provide a high quality of service for time-sensitive applications even on

a busy network. Load balancing is a way of better distributing the traffic volume across

access points. QoS is a means of allocating bandwidth and network access based on trans-

mission priorities for different types of wireless traffic within a single access point.

19.1.2 802.11e And WMM Standards Support

QoS describes a range of technologies for controlling data streams on shared network con-

nections. The IEEE 802.11e task group is in the process of defining a QoS standard for

transmission quality and availability of service on wireless networks. QoS is designed to

provide better network service by minimizing network congestion; limiting Jitter, Latency,

and Packet Loss; supporting dedicated bandwidth for time-sensitive or mission critical ap-

plications, and prioritizing wireless traffic for channel access.

As with all IEEE 802.11 working group standards, the goal is to provide a standard way of

implementing QoS features so that components from different companies are interoperable.

1 2 ... 206 207 208 209 210 211 212 213 214 215 216 ... 435 436

Sin comentarios

Psion Teklogix 9160 G2 Manual de usuario Pagina 211