Zyxel P-792H v2 [201/472] Hapter

P-792H v2 User’s Guide

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CHAPTER 15

Quality of Service (QoS)

15.1 Overview

Use the QoS screens to set up your P-792H v2 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 bandwidth. QoS

allows the P-792H v2 to group and prioritize application traffic and fine-tune

network performance.

Without QoS, all traffic data are 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 applications such as video-on-demand.

The P-792H v2 assigns each packet a priority and then queues the packet

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

those with low priorities 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.

15.2 QoS Overview

The following figure gives an overview of how to configure QoS on this P-792H v2:

PVC1, ATM QoS 1

PVC2, ATM QoS 2

Queue 1

Queue 2