ZyXEL NBG-318S Guia Do Utilizador

 Chapter 5 Wireless LAN

NBG-318S User’s Guide

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 NBG-318S uses WMM QoS to prioritize traffic streams according to the IEEE 802.1q tag 
or DSCP information in each packet’s header. The NBG-318S 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).

The following table describes the WMM QoS priority levels that the NBG-318S uses.

Table 23   WMM QoS Priorities

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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If you are configuring the NBG-318S from a computer connected to the 
wireless LAN and you change the NBG-318S’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 NBG-318S’s new settings.

Click Network > Wireless LAN to open the General screen.