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P-660RU-Tx v3 User’s Guide
99
C
H A P T E R
11
Quality of Service (QoS)
11.1 Overview
Use the
QoS
screen 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 bandwidth. QoS allows the ZyXEL Device
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 ZyXEL Device 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.
In the following figure, your Internet connection has an upstream transmission speed of 50
Mbps. You configure a classifier to assign the highest priority queue (6) to VoIP traffic from
the LAN interface, so that voice traffic would not get delayed when there is network
congestion. Traffic from the boss’s IP address (192.168.1.23 for example) is mapped to queue
5. Traffic that does not match these two classes are assigned priority queue based on the
internal QoS mapping table on the ZyXEL Device.
Figure 40
QoS Example
50 Mbps
DSL
VoIP: Queue 6
Boss: Queue 5
IP=192.168.1.23
Summary of Contents for P-660RU-T1 v3
Page 2: ......
Page 7: ...Safety Warnings P 660RU Tx v3 User s Guide 7...
Page 8: ...Safety Warnings P 660RU Tx v3 User s Guide 8...
Page 18: ...Table of Contents P 660RU Tx v3 User s Guide 18...
Page 22: ...List of Figures P 660RU Tx v3 User s Guide 22...
Page 25: ...25 PART I Introduction Introducing the ZyXEL Device 27 Introducing the Web Configurator 37...
Page 26: ...26...
Page 36: ...Chapter 1 Introducing the ZyXEL Device P 660RU Tx v3 User s Guide 36...
Page 41: ...41 PART II Status Device Information 43 System Logs 45 Traffic Statistics 47...
Page 42: ...42...
Page 49: ...49 PART III Quick Start Wizard Quick Start Wizard 51...
Page 50: ...50...
Page 57: ...57 PART IV Interface Setup Internet Setup 59 LAN Setup 73...
Page 58: ...58...
Page 82: ...82...
Page 86: ...Chapter 9 Static Route P 660RU Tx v3 User s Guide 86...
Page 98: ...Chapter 10 Network Address Translation NAT P 660RU Tx v3 User s Guide 98...
Page 106: ...Chapter 11 Quality of Service QoS P 660RU Tx v3 User s Guide 106...
Page 108: ...Chapter 12 ADSL P 660RU Tx v3 User s Guide 108...
Page 112: ...112...
Page 116: ...Chapter 14 Access Control P 660RU Tx v3 User s Guide 116...
Page 122: ...Chapter 15 Filters P 660RU Tx v3 User s Guide 122...
Page 136: ...Chapter 17 Universal Plug and Play UPnP P 660RU Tx v3 User s Guide 136...
Page 142: ...Chapter 19 CWMP P 660RU Tx v3 User s Guide 142...
Page 144: ...144...
Page 146: ...Chapter 20 Administrator Settings P 660RU Tx v3 User s Guide 146...
Page 156: ...Chapter 22 Firmware P 660RU Tx v3 User s Guide 156...
Page 158: ...Chapter 23 System Restart P 660RU Tx v3 User s Guide 158...
Page 160: ...Chapter 24 Diagnostic P 660RU Tx v3 User s Guide 160...
Page 162: ...162...
Page 172: ...Chapter 26 Product Specifications P 660RU Tx v3 User s Guide 172...
Page 174: ...174...
Page 196: ...Appendix A Setting up Your Computer s IP Address P 660RU Tx v3 User s Guide 196...
Page 204: ...Appendix B Pop up Windows JavaScripts and Java Permissions P 660RU Tx v3 User s Guide 204...
Page 229: ...Index P 660RU Tx v3 User s Guide 229 Wide Area Network see WAN wizard 51...