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ZyXEL G-270S User's Guide CHAPTER 4 Maintenance This chapter describes how to uninstall or upgrade the ZyXEL Utility. 4.1 The About Screen The About screen displays related version numbers of the ZyXEL G-270S. To display the screen as shown below, click the about ( ) button. Figure 26 About The following table describes the read-only fields in this screen. Table 15 About LABEL Driver Version Utility Version DESCRIPTION This field displays the version number of the ZyXEL G-270S driver. This field displays the version number of the ZyXEL Utility. 4.2 Uninstalling the ZyXEL Utility Follow the steps below to remove (or uninstall) the ZyXEL Utility from your computer. 1 Click Start, Programs, ZyXEL G-270S Utility, Uninstall ZyXEL G-270S Utility. 2 Click Finish to complete uninstalling the software and restart the computer when prompted. Chapter 4 Maintenance 51

Section	Page
ZyXEL G-270S User's Guide	1
Copyright	3
Federal Communications Commission (FCC) Interference Statement	4
ZyXEL Limited Warranty	6
Customer Support	7
Table of Contents	9
List of Figures	13
List of Tables	15
Preface	17
1. Getting Started	19
1.1.1 Application Overview	19
1.1.1.1 Infrastructure	19
1.1.1.2 Ad-Hoc	20
1.2 ZyXEL G-270S Hardware and Utility Installation	21
1.4 Windows XP Users Only	21
1.6 ZyXEL Utility Screen Summary	22
1.7 Connecting to a Wireless LAN	23
1.7.1 Site Survey	23
2. Wireless LAN Network	25
2.1.1 SSID	25
2.1.2 Channel	25
2.1.3 Transmission Rate (Tx Rate)	25
2.1.4 Super G	26
2.2.1 Data Encryption with WEP	26
2.2.2 IEEE 802.1x	26
2.2.2.1 EAP Authentication	27
2.2.3 WPA(2)	27
2.2.3.1 Encryption	27
2.2.3.2 User Authentication	28
2.2.4 WPA(2)-PSK Application Example	28
2.2.5 WPA(2) with RADIUS Application Example	28
2.3 Encryption Type	29
2.4 Preamble Type	29
2.5.1 Enabling OTIST	30
2.5.1.1 AP	30
2.5.1.2 Wireless Client	31
2.5.2 Starting OTIST	32
2.5.3 Notes on OTIST	32
3. ZyXEL Utility Configuration	35
3.2.2 Security Settings	38
3.2.2.1 WEP Encryption	38
3.2.2.2 WPA/WPA2	39
3.2.2.3 WPA-PSK/WPA2-PSK	40
3.2.2.4 802.1x	41
3.2.3 Confirm Save Screen	42
3.3 The Profile Screen	43
3.3.1 Adding a New Profile	45
3.4 The Adapter Screen	49
4. Maintenance	51
4.1 The About Screen	51
5. Troubleshooting	53
5.1 Problems Starting the ZyXEL Utility Program	53
5.2 Problem with the Link Status	53
5.3 Problems Communicating With Other Computers	54
A. Product Specifications	55
B. Disable Windows XP Wireless LAN Configuration Tool	57
Via the Wireless Network System Tray Icon	57
Via the Control Panel	60
C. Management with Wireless Zero Configuration	63
Activating Wireless Zero Configuration	63
Connecting to a Wireless Network	64
Security Settings	67
Association	68
Authentication	69
Ordering the Preferred Networks	72
D. Types of EAP Authentication	75
EAP-MD5 (Message-Digest Algorithm 5)	75
EAP-TLS (Transport Layer Security)	75
EAP-TTLS (Tunneled Transport Layer Service)	75
PEAP (Protected EAP)	76
LEAP	76
Dynamic WEP Key Exchange	76
WPA(2)	77
User Authentication	77
Encryption	77
Security Parameters Summary	78
Index	79
Numerics	79
A	79
C	79
D	79
E	79
F	79
G	79
H	79
I	79
L	80
M	80
N	80
O	80
P	80
Q	80
R	80
S	80
T	80
U	81
V	81
W	81