Quality Of Service (Qos); Chapter 18 Quality Of Service (Qos); Overview; What You Can Do In The Qos Screens - ZyXEL Communications P-2612HW Series User Manual

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H A P T E R
This chapter contains information about configuring QoS, editing classifiers and
viewing the ZyXEL Device's QoS packet statistics.

18.1 Overview

This chapter discusses the ZyXEL Device's QoS screens. Use these screens to set
up your ZyXEL Device to use QoS for traffic management.
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. QoS allows the ZyXEL Device to group and prioritize application traffic
and fine-tune network performance.
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.
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.
• See Section 18.5 on page 349

18.1.1 What You Can Do in the QoS Screens

• Use the General screen
ZyXEL Device, decide allowable bandwidth using QoS and configure priority
mapping settings for traffic that does not match a custom class.
• Use the Class Setup screen
sort traffic into different flows and assign priority and define actions to be
performed for a classified traffic flow.
P-2612HW Series User's Guide

Quality of Service (QoS)

for advanced technical information on SIP.
(Section 18.2 on page
(Section 18.3 on page
18
341) to enable QoS on the
343) to set up classifiers to
337