ZyXEL Communications wireless n gigbit router zyxel manual Quality of Service, 123

Chapter 7 Wireless LAN

7.12.1.1 Requirements for Roaming

The following requirements must be met in order for wireless stations to roam between the coverage areas.

1All the access points must be on the same subnet and configured with the same

ESSID.

2If IEEE 802.1x user authentication is enabled and to be done locally on the access point, the new access point must have the user profile for the wireless station.

3The adjacent access points should use different radio channels when their coverage areas overlap.

4All access points must use the same port number to relay roaming information.

5The access points must be connected to the Ethernet and be able to get IP addresses from a DHCP server if using dynamic IP address assignment.

7.12.2 Quality of Service

This section discusses the Quality of Service (QoS) features available on the NBG- 460N.

7.12.2.1 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 NBG-460N uses WMM QoS to prioritize traffic streams according to the IEEE 802.1q tag or DSCP information in each packet’s header. The NBG-460N 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).

NBG-460N User’s Guide

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