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P-2612HNU-Fx User’s Guide
223
CHAPTER 17
Quality of Service (QoS)
17.1 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
Internet gaming, and those for which jitter alone is a problem such as Internet
radio or streaming video.
Note: The ZyXEL Device has built-in configurations for Voice over IP (IP). The Quality
of Service (QoS) feature does not affect VoIP traffic.
• See Section 17.6 on page 233 for advanced technical information on SIP.
17.1.1 What You Can Do in this Chapter
•Use the General screen (Section 17.2 on page 224) to enable QoS on the
ZyXEL Device and decide allowable bandwidth using QoS.
•Use the Queue Setup screen (Section 17.3 on page 226) lets you configure
QoS queue assignment.
•Use the Class Setup screen (Section 17.4 on page 227) to set up classifiers to
sort traffic into different flows and assign priority and define actions to be
performed for a classified traffic flow.