ZyXEL NWA1121-NI User Guide - Page 92

Chapter 6 Wireless LAN

NWA1121-NI User’s Guide

92

6.9.2

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 the delivery requirements of the individual and

applications. 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 NWA1121-NI uses WMM QoS to prioritize traffic streams according to the IEEE 802.1q or DSCP

information in each packet’s header. The NWA1121-NI automatically determines the priority to use

for an individual traffic stream. This prevents reductions in data transmission for applications that

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

6.9.2.1

WMM QoS Priorities

The following table describes the WMM QoS priority levels that the NWA1121-NI uses.

Roaming

If you have two or more NWA1121-NIs (or other wireless access points) on your

wireless network, you can enable this option so that wireless devices can change

locations without having to log in again. This is useful for devices, such as notebooks,

that move around a lot.

Antenna

An antenna couples Radio Frequency (RF) signals onto air. A transmitter within a

wireless device sends an RF signal to the antenna, which propagates the signal

through the air. The antenna also operates in reverse by capturing RF signals from

the air.

Positioning the antennas properly increases the range and coverage area of a wireless

LAN.

TERM

DESCRIPTION

Table 27

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_BESTEFFORT)

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.

Section	Page
NWA1121-NI	1
Contents Overview	3
Table of Contents	5
User’s Guide	9
Introducing the NWA1121-NI	11
1.1 Introducing the NWA1121-NI	11
1.2 Wireless Modes	11
1.2.1 MBSSID	11
1.2.2 Wireless Client	13
1.2.3 Root AP	14
1.2.4 Repeater	14
1.3 Ways to Manage the NWA1121-NI	15
1.4 Configuring Your NWA1121-NI’s Security Features	16
1.4.1 Control Access to Your Device	16
1.4.2 Wireless Security	16
1.5 Good Habits for Managing the NWA1121-NI	16
1.6 Hardware Connections	17
1.7 LED	17
Introducing the Web Configurator	19
2.1 Accessing the Web Configurator	19
2.2 Resetting the NWA1121-NI	20
2.2.1 Methods of Restoring Factory-Defaults	21
2.3 Navigating the Web Configurator	22
2.3.1 Title Bar	22
2.3.2 Navigation Panel	23
2.3.3 Main Window	24
Dashboard	25
3.1 The Dashboard Screen	25
Tutorial	29
4.1 How to Configure the Wireless LAN	29
4.1.1 Choosing the Wireless Mode	29
4.1.2 Further Reading	29
4.2 How to Configure Multiple Wireless Networks	29
4.2.1 Configure the SSID Profiles	31
4.2.2 Configure the Standard Network	33
4.2.3 Configure the VoIP Network	34
4.2.4 Configure the Guest Network	36
4.2.5 Testing the Wireless Networks	38
4.3 NWA1121-NI Setup in AP and Wireless Client Modes	38
4.3.1 Scenario	38
4.3.2 Configuring the NWA1121-NI in MBSSID or Root AP Mode	39
4.3.3 Configuring the NWA1121-NI in Wireless Client Mode	42
4.3.4 MAC Filter Setup	44
4.3.5 Testing the Connection and Troubleshooting	45
Technical Reference	47
Monitor	49
5.1 Overview	49
5.2 What You Can Do	49
5.3 View Logs	49
5.4 Statistics	50
5.5 Association List	51
5.6 Channel Usage	52
Wireless LAN	55
6.1 Overview	55
6.2 What You Can Do in this Chapter	55
6.3 What You Need To Know	56
6.4 Wireless Settings Screen	60
6.4.1 Root AP Mode	61
6.4.2 Repeater Mode	64
6.4.3 Wireless Client Mode	67
6.4.4 MBSSID Mode	69
6.5 SSID Screen	72
6.5.1 Configuring SSID	73
6.6 Wireless Security Screen	74
6.6.1 Security: WEP	76
6.6.2 Security: 802.1x Only	77
6.6.3 Security: 802.1x Static WEP	79
6.6.4 Security: WPA, WPA2, WPA2-MIX	83
6.6.5 Security: WPA-PSK, WPA2-PSK, WPA2-PSK-MIX	86
6.7 RADIUS Screen	87
6.8 MAC Filter Screen	89
6.9 Technical Reference	91
6.9.1 Additional Wireless Terms	91
6.9.2 WMM QoS	92
6.9.3 Security Mode Guideline	93
LAN	94
7.1 Overview	94
7.2 What You Can Do in this Chapter	94
7.3 What You Need to Know	94
7.4 LAN IP Screen	96
VLAN	98
8.1 Overview	98
8.1.1 What You Can Do in This Chapter	98
8.2 What You Need to Know	98
8.3 VLAN Screen	99
System	101
9.1 Overview	101
9.2 What You Can Do in this Chapter	101
9.3 What You Need To Know	102
9.4 WWW Screen	104
9.5 Certificates Screen	105
9.6 Telnet Screen	106
9.7 SNMP Screen	107
9.8 FTP Screen	110
9.9 Technical Reference	111
9.9.1 MIB	111
9.9.2 Supported MIBs	112
9.9.3 Private-Public Certificates	112
9.9.4 Certification Authorities	112
9.9.5 Checking the Fingerprint of a Certificate on Your Computer	112
Log Settings	115
10.1 Overview	115
10.2 What You Can Do in this Chapter	115
10.3 What You Need To Know	116
10.4 Log Settings Screen	116
Maintenance	119
11.1 Overview	119
11.2 What You Can Do in this Chapter	119
11.3 What You Need To Know	120
11.4 General Screen	120
11.5 Password Screen	121
11.6 Time Screen	122
11.7 Firmware Upgrade Screen	123
11.8 Configuration File Screen	124
11.8.1 Backup Configuration	124
11.8.2 Restore Configuration	124
11.8.3 Back to Factory Defaults	125
11.9 Restart Screen	125
Troubleshooting	127
12.1 Power, Hardware Connections, and LEDs	127
12.2 NWA1121-NI Access and Login	128
12.3 Internet Access	129
Setting Up Your Computer’s IP Address	131
Pop-up Windows, JavaScript and Java Permissions	159
IP Addresses and Subnetting	171
Wireless LANs	179
Legal Information	193

ZyXEL NWA1121-NI User Guide - Page 92

WMM QoS - roaming

Page 92 highlights