ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 94)

Chapter 7 Wireless LAN

NBG420N User’s Guide

7.4.1 WMM QoS

WMM (Wi-Fi MultiMedia) QoS (Quality of Service) ensures quality of service in wireless

networks. It controls WLAN transmission priority on packets to be transmitted over the

wireless network.

WMM QoS prioritizes wireless traffic according to delivery requirements. WMM QoS is a

part of the IEEE 802.11e QoS enhancement to certified Wi-Fi wireless networks.

On APs without WMM QoS, all traffic streams are given the same access priority to the

wireless network. If the introduction of another traffic stream creates a data transmission

demand that exceeds the current network capacity, then the new traffic stream reduces the

throughput of the other traffic streams.

The NBG420N uses WMM QoS to prioritize traffic streams according to the IEEE 802.1q tag

or DSCP information in each packet’s header. The NBG420N automatically determines the

priority to use for an individual traffic stream. This prevents reductions in data transmission

for applications that are sensitive to latency (delay) and jitter (variations in delay).

7.4.1.1 WMM QoS Priorities

The following table describes the WMM QoS priority levels that the NBG420N uses.

7.5 General Wireless LAN Screen

" If you are configuring the NBG420N from a computer connected to the

wireless LAN and you change the NBG420N’s SSID, channel or security

settings, you will lose your wireless connection when you press Apply to

confirm. You must then change the wireless settings of your computer to

match the NBG420N’s new settings.

Click Network > Wireless LAN to open the General screen.

Table 28 WMM QoS Priorities

PRIORITY LEVEL DESCRIPTION

voice

(WMM_VOICE)

Typically used for traffic that is especially sensitive to jitter. Use this priority

to reduce latency for improved voice quality.

video

(WMM_VIDEO)

Typically used for traffic which has some tolerance for jitter but needs to be

prioritized over other data traffic.

best effort

(WMM_BEST_EFFORT)

Typically used for traffic from applications or devices that lack QoS

capabilities. Use best effort priority for traffic that is less sensitive to latency,

but is affected by long delays, such as Internet surfing.

background

(WMM_BACKGROUND)

This is typically used for non-critical traffic such as bulk transfers and print

jobs that are allowed but that should not affect other applications and users.

Use background priority for applications that do not have strict latency and

throughput requirements.

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