ZyXEL Communications p-2612HNU-FX Manuel D’Utilisation

P-2612HNU-Fx User’s Guide

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 

 for advanced technical information on SIP.

• Use  the  General screen (

) to enable QoS on the 

ZyXEL Device and decide allowable bandwidth using QoS.

• Use  the  Queue Setup screen (

) lets you configure 

QoS queue assignment.

• Use  the  Class Setup screen (

) to set up classifiers to 

sort traffic into different flows and assign priority and define actions to be 

performed for a classified traffic flow.