ZyXEL Communications VSG1432 Betriebsanweisung PDF herunterladen (Seite 151)

VSG1432-B101 Series User’s Guide

151

CHAPTER 10

Quality of Service (QoS)

10.1 Overview

Quality of Service (QoS) refers to both a network’s ability to deliver data with

minimum delay, and the networking methods used to control the use of

bandwidth. Without QoS, all traffic data is equally likely to be dropped when the

network is congested. This can cause a reduction in network performance and

make the network inadequate for time-critical application such as video-on-

demand.

Configure QoS on the ZyXEL Device to group and prioritize application traffic and

fine-tune network performance. Setting up QoS involves these steps:

1 Configure classifiers to sort traffic into different flows.

2 Assign priority and define actions to be performed for a classified traffic flow.

The ZyXEL Device assigns each packet a priority and then queues the packet

accordingly. Packets assigned a high priority are processed more quickly than

those with low priority if there is congestion, allowing time-sensitive applications

to flow more smoothly. Time-sensitive applications include both those that require

a low level of latency (delay) and a low level of jitter (variations in delay) such as

Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a

problem such as Internet radio or streaming video.

This chapter contains information about configuring QoS and editing classifiers.

10.1.1 What You Can Do in this Chapter

•The General screen lets you enable or disable QoS and set the upstream

bandwidth

(Section 10.3 on page 153).

•The Queue Setup screen lets you configure QoS queue assignment (Section

10.4 on page 154).

•The Class Setup screen lets you add, edit or delete QoS classifiers (Section

10.5 on page 157).

•The Policer Setup screen lets you add, edit or delete QoS policers (Section

10.5 on page 157).

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ZyXEL Communications VSG1432 Betriebsanweisung Seite 151