ZyXEL Communications NWA-3550 ユーザーズマニュアル

 Chapter 8 Wireless Configuration

NWA-3500/NWA-3550 User’s Guide

• If your NWA (in bridge mode) is connected to a wired LAN while communicating 

with another wireless bridge that is also connected to the same wired LAN.

Figure 87   Bridge Loop: Bridge Connected to Wired LAN

To prevent bridge loops, ensure that you enable STP in the Wireless screen or 
your NWA is not set to bridge mode while connected to both wired and wireless 
segments of the same LAN.

This section discusses the Quality of Service (QoS) features available on the NWA.

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 NWA uses WMM QoS to prioritize traffic streams according to the IEEE 802.1q 
tag or DSCP information in each packet’s header. The NWA automatically 
determines the priority to use for an individual traffic stream. This prevents 

Bridge

Bridge