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Channel, RTS/CTS,

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Appendix B Wireless LANs An ESSID (ESS IDentification) uniquely identifies each ESS. All access points and their associated wireless clients within the same ESS must have the same ESSID in order to communicate. Figure 111 Infrastructure WLAN Channel A channel is the radio frequency(ies) used by wireless devices to transmit and receive data. Channels available depend on your geographical area. You may have a choice of channels (for your region) so you should use a channel different from an adjacent AP (access point) to reduce interference. Interference occurs when radio signals from different access points overlap causing interference and degrading performance. Adjacent channels partially overlap however. To avoid interference due to overlap, your AP should be on a channel at least five channels away from a channel that an adjacent AP is using. For example, if your region has 11 channels and an adjacent AP is using channel 1, then you need to select a channel between 6 or 11. RTS/CTS A hidden node occurs when two stations are within range of the same access point, but are not within range of each other. The following figure illustrates a N220 User's Guide 133

Section	Page
N220	1
About This User's Guide	3
Document Conventions	5
Safety Warnings	7
Contents Overview	9
Table of Contents	11
Introduction and Configuration	15
Getting Started	17
1.1 Overview	17
1.1.1 What You Need to Know	17
1.1.2 Before You Begin	18
1.2 About Your N220	18
1.2.1 Hardware	18
1.3 Application Overview	19
1.3.1 Infrastructure	19
1.3.2 Ad-Hoc	20
1.4 Hardware and Utility Installation	20
1.4.1 ZyXEL Utility Icon	20
1.5 Configuration Methods	21
1.5.1 Enabling Windows Wireless Configuration	21
1.5.2 Accessing the ZyXEL Utility	21
Tutorial	23
2.1 Overview	23
2.1.1 What You Can Do in This Tutorial	23
2.1.2 What You Need to Know	23
2.1.3 Before You Begin	24
2.2 Connecting to an AP using Wi-Fi Protected Setup (WPS)	24
2.2.1 Push Button Configuration (PBC)	24
2.2.2 PIN Configuration	25
2.3 Connecting to an AP Without Using WPS	29
2.3.1 Manually Connecting to a Wireless LAN	29
2.3.2 Creating and Using a Profile	31
2.4 Configuring the N220 as an AP	34
Wireless LANs	37
3.1 Overview	37
3.1.1 What You Can Do in This Section	37
3.1.2 What You Need to Know	37
3.1.3 Before You Begin	38
3.2 Wireless LAN Overview	38
3.3 Wireless LAN Security	39
3.3.1 User Authentication and Encryption	39
3.4 WiFi Protected Setup	41
3.4.1 Push Button Configuration	42
3.4.2 PIN Configuration	42
3.4.3 How WPS Works	44
3.4.4 Limitations of WPS	47
Station Mode	49
4.1 Overview	49
4.1.1 What You Can Do in This Section	49
4.1.2 What You Need to Know	49
4.1.3 Before You Begin	50
4.2 ZyXEL Utility Screen Summary	50
4.3 The Link Info Screen	51
4.3.1 Trend Chart	53
4.4 The Site Survey Screen	54
4.4.1 Security Settings	55
4.4.2 Summary Screen	61
4.5 The Profile Screen	62
4.5.1 Adding a New Profile	63
4.6 The Adapter Screen	68
4.6.1 WPS: PBC (Push Button Configuration)	69
4.6.2 WPS: PIN - Use this Device’s PIN	69
4.6.3 WPS: PIN - Use the PIN from the AP or Wireless Router	70
4.7 Security Settings in Windows Vista	71
4.7.1 Using PEAP in Vista	72
4.7.2 Using TLS in Vista	73
AP Mode	75
5.1 Overview	75
5.1.1 What You Can Do in This Section	76
5.1.2 What You Need to Know	76
5.1.3 Before You Begin	76
5.2 AP Mode Screen Summary	77
5.3 The Link Info Screen	77
5.4 The Configuration Screen	78
5.4.1 Security Settings	80
5.5 The MAC Filter Screen	82
Maintenance	85
6.1 Overview	85
6.1.1 What You Can Do in This Section	85
6.1.2 What You Need to Know	85
6.1.3 Before You Begin	85
6.2 The About Screen	86
6.3 Uninstalling the ZyXEL Utility	86
6.4 Upgrading the ZyXEL Utility	87
Troubleshooting and Specifications	89
Troubleshooting	91
7.1 Power, Hardware Connections, and LEDs	91
7.2 Accessing the ZyXEL Utility	92
7.3 Link Quality	92
7.4 Problems Communicating with Other Computers	93
Product Specifications	95
Appendices and Index	99
Setting Up Your Computer’s IP Address	101
Wireless LANs	131
Windows Wireless Management	147
Wireless for Windows 7	173
Legal Information	179

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Appendix B Wireless LANs

N220 User’s Guide

133

An ESSID (ESS IDentification) uniquely identifies each ESS. All access points and

their associated wireless clients within the same ESS must have the same ESSID

in order to communicate.

Figure 111

Infrastructure WLAN

Channel

A channel is the radio frequency(ies) used by wireless devices to transmit and

receive data. Channels available depend on your geographical area. You may have

a choice of channels (for your region) so you should use a channel different from

an adjacent AP (access point) to reduce interference. Interference occurs when

radio signals from different access points overlap causing interference and

degrading performance.

Adjacent channels partially overlap however. To avoid interference due to overlap,

your AP should be on a channel at least five channels away from a channel that an

adjacent AP is using. For example, if your region has 11 channels and an adjacent

AP is using channel 1, then you need to select a channel between 6 or 11.

RTS/CTS

A hidden node occurs when two stations are within range of the same access

point, but are not within range of each other. The following figure illustrates a