Instruction/ maintenance manual of the product G-120 ZyXEL Communications
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ZyXEL G-120 802.1 1g Wireless CardBus Card User ’ s Guide V ersion 1.00 Edition 1 6/2006.
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ZyXEL G-120 User’s Guide Copyright 3 Copyright Copyright © 2006 by ZyXEL Communications Corpo ration. The contents of this publication may not be reprod uced in any part or as a whole, transcribed,.
ZyXEL G-120 User’s Guide 4 Certifications Certifications Federal Communications Commissi on (FCC) Interference St atement The device complies with Part 15 of FCC rules. Operation is subject to the following two conditions: • This device may not cause harmful interference.
ZyXEL G-120 User’s Guide Certifications 5 Viewing Certifications 1 Go to http://www .zyxel.com . 2 Select your product from the drop-d own list box on the ZyXEL home page to go to that product's page. 3 Select the certification you wish to view from this page.
ZyXEL G-120 User’s Guide 6 ZyXEL Limited Warranty ZyXEL Limited W arranty ZyXEL warrants to the original en d user (purchaser) that this product is free from any defects in materials or workmanship for a period of up to two (2) years from the date of purch ase.
ZyXEL G-120 User’s Guide Customer Support 7 Customer Support Please have the following information r eady when you contact customer support. • Product model and serial number . • W arranty Information. • Date that you received your de vice. • Brief description of the problem and the steps yo u took to solve i t.
ZyXEL G-120 User’s Guide 8 Customer Suppo rt POLAND info@pl.zyxel.com +48 (22) 333 8250 www .pl.zyxel.com ZyXEL Communications ul. Okrzei 1A 03-715 W arszawa Poland +48 (22) 333 8251 RUSSIA http://zyxel.ru/support +7-095-542- 89-29 www .zyxel.ru ZyXEL Russia Ostrovityanova 37a S tr .
ZyXEL G-120 User’s Guide Table of Contents 9 T able of Content s Copyright .................................................. ................................................................ 3 Certifications .........................................
ZyXEL G-120 User’s Guide 10 Table of Contents 3.3 Introduction to OTIST .................. ............. ................ ............. ................ ......... 32 3.3.1 Enabling OTIST ............... ................ ............. ............. .
ZyXEL G-120 User’s Guide Table of Contents 11 Index ..................................... ..................................................... .....
ZyXEL G-120 User’s Guide 12 Table of Contents.
ZyXEL G-120 User’s Guide List of Figure s 13 List of Figures Figure 1 Application: Infrastructure ... ................ ............. ................ ............. .......... 20 Figure 2 Application: Ad-Hoc ................... ................ .....
ZyXEL G-120 User’s Guide 14 List of Figures Figure 39 Windows XP SP1: Wireless Network Connection S tatus .......... ............. 65 Figure 40 Windows XP SP2: Wireless Network Connection ............... ................ ... 65 Figure 41 Windows XP SP1: Wireless Net wor k Connection Properties .
ZyXEL G-120 User’s Guide List of Tables 15 List of T ables T able 1 ZyXEL U tility: System Tray Icon .. ................ ................ ................ ............. 21 T able 2 Link Info ...... ................ ............. ................. ..
ZyXEL G-120 User’s Guide 16 List of Tables.
ZyXEL G-120 User’s Guide Preface 17 Preface Congratulations on your p u rchase of the Zy XEL G-120 802.1 1g Wireless CardBus Card. Y our G-120 is easy to install and configure. About This U ser's Guide This manual is designed to guide y ou through the configu ration of your G-120 fo r its various applications.
ZyXEL G-120 User’s Guide 18 Preface Graphics Icons Key Wireless Access Point Computer Notebook Computer Server Modem or Router Wireless Signal Internet Cloud.
ZyXEL G-120 User’s Guide Chapter 1 Getting Started 19 C HAPTER 1 Getting S t arted This chapter introduces the G-120 and prepares you to use the ZyXEL uti lity . 1.1 About Y our G-120 The G-120 is an IEEE 802.1 1b/g compliant wirele ss LAN adapter .
ZyXEL G-120 User’s Guide 20 Chapter 1 Getting Started Figure 1 Application: Infrastructure 1.2.0.2 Ad-Hoc T o set up a small indepe ndent wireless workgroup without an AP , use Ad-Hoc . Ad-Hoc does not requi re an AP or a wired ne twork. T wo or more wireless clients communicate directly to each other .
ZyXEL G-120 User’s Guide Chapter 1 Getting Started 21 1.3 G-120 Hardware and Utility Inst allation Follow the instructions in the Quick S tart Guide to install the ZyXEL utility and make hardware connections . 1.3.1 ZyXEL Utility Icon After you install and start the ZyXEL utility , an icon for the ZyXEL utility appears in the system tray .
ZyXEL G-120 User’s Guide 22 Chapter 1 Getting Started Figure 4 Enable WZC Refer to the appendices fo r information on how to u se WZC to manage the G-120. T o re-activate the ZyXEL utility , double-click the ( ) icon on your desktop or click St a r t , (All) Pr ograms , ZyXEL G-120 Utility , ZyXEL G-120 Utility GUI .
ZyXEL G-120 User’s Guide Chapter 2 Tutorial 23 C HAPTER 2 Tu t o r i a l The following sections show you how to join a wireless networ k using the ZyXEL utility , as in the following diagrams. The wireless client is labeled C and the access point is labeled AP .
ZyXEL G-120 User’s Guide 24 Chapter 2 Tutorial Figure 6 ZyXEL Utility: Site Survey 2 The wireless client automatically searches for available wireless networks. Click Scan if you want to search again. If no entry di splays in the A vailable Network List , that means there is no wireless network available within ra nge.
ZyXEL G-120 User’s Guide Chapter 2 Tutorial 25 Figure 8 ZyXEL Utility: Confirm New Settings 6 The ZyXEL utility returns to the Link Info screen while it connec ts to the wireless network using your settings.
ZyXEL G-120 User’s Guide 26 Chapter 2 Tutorial This example illustrates how to set up a profile and connect the wireless client to an access point configured for WP A-PSK security . In this example, the SSID is “SSID_Example3” and the pre-shared key is “ThisismyWP A-PSKpre-sh aredkey” in the AP .
ZyXEL G-120 User’s Guide Chapter 2 Tutorial 27 Figure 12 ZyXEL Utility: Profile Security 5 This screen varies depending on the encryp tion method you selected in the previous screen. In this example, enter the pre-shared key and leav e the encryption type at the default setting.
ZyXEL G-120 User’s Guide 28 Chapter 2 Tutorial Note: Only one profile can be activate d and used at any given time. Figure 15 ZyXEL Utility: Profile Activate 8 When you activate the new profile , the ZyXEL utility goes to the Link Info screen while it connects to the AP using your settings.
ZyXEL G-120 User’s Guide Chapter 3 Wireless LAN Network 29 C HAPTER 3 Wireless LAN Network This chapter provides backgro und in formation on wireless LAN network. 3.1 Wireless LAN Overview The following figure pro vides an exampl e of a wireless network with an AP .
ZyXEL G-120 User’s Guide 30 Ch apter 3 Wireless LAN Network • Every device in the same wireless network must use security compatible with the AP or peer computer . Security stops unauthorized devices from using the wireless network. It can also protect the information that is sent in the wireless network.
ZyXEL G-120 User’s Guide Chapter 3 Wireless LAN Network 31 For WLAN adapters without the passphrase feat ure, you can still take advantage of this feature by writing down the four auto matically generated WEP keys from the Security Setting screen of the ZyXEL utility and entering them manually as the WEP keys in the other WLAN adapter(s).
ZyXEL G-120 User’s Guide 32 Ch apter 3 Wireless LAN Network 3.2.1.3 WP A and WP A2 W i-Fi Protected Access (WP A) is a subset of the IEEE 802.1 1i standard. WP A2 (IEEE 802.1 1i) is a wireless security standard tha t defines stronger encryp tion, authentication and key manage ment than WP A.
ZyXEL G-120 User’s Guide Chapter 3 Wireless LAN Network 33 3.3.1.1 AP On the P-334WT , you can enable OTIST using the Reset button or the web configurator . If you use the Reset button, the default (01234567 ) or previous saved (through the web configurator) Setup key is used to encrypt the settings that you want to transfer .
ZyXEL G-120 User’s Guide 34 Ch apter 3 Wireless LAN Network 3.3.1.2 Wireless Client Start the ZyXEL utility and click the Adapter tab. Select the OTIST check box, enter the same Setup Key as your AP’ s and click Save .
ZyXEL G-120 User’s Guide Chapter 3 Wireless LAN Network 35 3.3.3 Notes on OTIST 1 If you enabled OTIST in the wireless client, you see this screen each time you start the utility .
ZyXEL G-120 User’s Guide 36 Ch apter 3 Wireless LAN Network.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 37 C HAPTER 4 ZyXEL Utility Configuration This chapter shows you ho w to configure your G-120 using the ZyXEL uti lity . 4.1 The Link Info Screen When the ZyXEL utility starts, the Link Info screen displays, showing the current configuration and conne ction status of your G-120.
ZyXEL G-120 User’s Guide 38 Chapter 4 ZyXEL Utility Configuration 4.1.1 T rend Chart Click T r end Chart in the Link Info screen to display a screen as shown below . Use this screen to view real-time data traffic statistics. AP MAC Address This field displays the MAC address of the AP or peer computer to which the G-120 is associated.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 39 Figure 18 S tation Mode: Link Info: T rend Chart The following table describes the labels in this screen. 4.2 The Site Survey Screen Use the Site Survey screen to scan for and connect to a wireless network automatically .
ZyXEL G-120 User’s Guide 40 Chapter 4 ZyXEL Utility Configuration Figure 19 Site Survey The following table describes the labels in this screen. Table 4 Site Survey LABEL DESCRIPTION Available Network List Click a column heading to sort the entries.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 41 4.2.1 Security Settings When you co nfigure the G-120 to connect to a network with wireless security activated and the security settings are disabled on the G-120, the screen varies accor ding to the encryption method used by the selected network .
ZyXEL G-120 User’s Guide 42 Chapter 4 ZyXEL Utility Configuration 4.2.1.2 WP A-PSK/WP A2-PSK Note: Y ou can use WP A2 and WP A2-PSK with the G-120 only in Microsoft Windows XP or Windows 2000. Key x (where x is a number between 1 and 4) Select this option if you want to manually en ter the WEP keys.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 43 Figure 21 Security Setting: WP A-PSK/WPA2-P SK The following table describes the labels in this screen. 4.2.1.3 WP A-R ADIUS/WP A 2-RADIUS Note: Y ou can use WP A2 and WP A2-PSK with the G-120 only in Microsoft Windows XP or Windows 2000.
ZyXEL G-120 User’s Guide 44 Chapter 4 ZyXEL Utility Configuration The following table describes the labels in this screen. 4.2.1.4 RADIUS Configure IEEE 802.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 45 Figure 23 Security Setting: RADIUS The following table describes the labels in this screen.
ZyXEL G-120 User’s Guide 46 Chapter 4 ZyXEL Utility Configuration Figure 24 Confirm New Settings The following table describes the labels in this screen. 4.3 The Profile Screen A profile is a set of wireless para meters that you need to connec t to a wi reless ne twork.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 47 Figure 25 Profile The following table describes the labels in this screen. Table 10 Profile LABEL DESCRIPTION Profile List Click a column heading to sort the e ntries. , , or denotes that the wire less device is in infrastructure mode and the wireless security is activated.
ZyXEL G-120 User’s Guide 48 Chapter 4 ZyXEL Utility Configuration 4.3.1 Adding a New Prof ile Follow the steps below to add a new profile. 1 Click Add in the Pr ofile screen. An Add New Profile screen displays as shown next. Click Next to continue. Figure 26 Profile: Add a New Profile The following table describes the labels in this screen.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 49 2 If you select the Infrastructure network type in the previous screen, skip to step 3 . If you select the Ad-Hoc network type in the previous scr een, a screen displays as follows. Select a channel number and click Next to continue.
ZyXEL G-120 User’s Guide 50 Chapter 4 ZyXEL Utility Configuration Figure 27 Profile: Select a Channel The following table describes the labels in this screen.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 51 Figure 28 Profile: Security Settings 4 The screen varies depending on the encryption me thod you select in the previous screen. The settings must be exactly the same on the APs or othe r peer wireless computers as they are on the G-120.
ZyXEL G-120 User’s Guide 52 Chapter 4 ZyXEL Utility Configuration Figure 30 Profile: Confirm New Settings 6 T o use this network profile, click the Activate Now button. Otherwise, click the Activate Later button. Y ou can activate onl y one profile at a time.
ZyXEL G-120 User’s Guide Chapter 4 ZyXEL Utilit y Configuration 53 Figure 32 Adapter The following table describes the labels in this screen. Table 13 Adapte r LABEL DESCRIPTION Adapter Setting T ra.
ZyXEL G-120 User’s Guide 54 Chapter 4 ZyXEL Utility Configuration Setup Key En ter the same setup key (up to ei ght printable characters) as the ZyXEL AP or wireless router to which you want to a ssociate. The default OTIST setu p key is "01234567".
ZyXEL G-120 User’s Guide Chapter 5 Maintenance 55 C HAPTER 5 Maintenance This chapter describes how to unin stall or upgrade the ZyXEL utility . 5.1 The About Screen The About screen displays driver and util ity versio n numbers of the G-120. T o display the screen as shown below , click the about ( ) button.
ZyXEL G-120 User’s Guide 56 Chapter 5 Maintenance Figure 34 Uninstall: Confirm 3 Click Finish to complete uninstalling the softwa re and restart the computer when prompted. Figure 35 Uninstall: Finish 5.3 Upgrading the ZyXEL Utility Note: Before you uninst all the ZyXEL utility , take note of your current wirele ss configurations.
ZyXEL G-120 User’s Guide Chapter 5 Maintenance 57 6 Insert the G-120 and check the version numbers in the About screen to make sure the new utility is installed properly .
ZyXEL G-120 User’s Guide 58 Chapter 5 Maintenance.
ZyXEL G-120 User’s Guide Chapter 6 Trou bleshoot ing 59 C HAPTER 6 T roubleshooting This chapter covers potential problems and the possible remedies. After each problem description, some instructions ar e provided to help you to diag nose and to solve the problem.
ZyXEL G-120 User’s Guide 60 Chapter 6 Troubleshooting 6.3 Problems Communicating With Other Computers Table 17 Troubleshootin g Communication Problem PROBLEM CORRECTIVE ACTION The computer with the G-120 installed cannot communicate with the other computer(s).
ZyXEL G-120 User’s Guide Appendix A Product Specifications 61 A PPENDIX A Product S pecifications Table 18 Product Specification s PHYSICAL AND ENVIRONMENTAL Product Name ZyXEL G-120 802.1 1g Wireless Card Bus Card Interface CardBus T ype II S tandards IEEE 802.
ZyXEL G-120 User’s Guide 62 Appendix A Product Specifications Modulation IEEE 802.1 1g: 54, 48, 36, 24, 18, 12, 9, 6 Mbps (OFDM) IEEE 802.1 1b: 1 1, 5.5 Mbps ( CCK), 2 Mbp s (DQPSK), 1 Mbps (DBPSK) Output Power 18 dBm (typical ) at 1 1Mbps CCK, QPSK, BPSK 15 dBm (typical) at 54Mbps OFDM RX Sensitivity IEEE 802.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 63 A PPENDIX B Management with Wireless Zero Configuration This appendix shows you how to manage your G-120 u sing the W indows XP wireless zero configuration tool. Be sure you have the W indows XP service pack 2 installed on your computer .
ZyXEL G-120 User’s Guide 64 Appendix B Management with Wireless Zero Configuration Connecting to a Wireless Network 1 Double-click the network icon for wireless conn ections in the system tray to open the W ireless Network Connection S tatus screen.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 65 W indows XP SP1: In the W ireless Network Connection S tatus screen, click Properties and the Wir eless Ne tworks tab to open the Wir eless Networ k Connection Properties screen.
ZyXEL G-120 User’s Guide 66 Appendix B Management with Wireless Zero Configuration The following table describes the ic ons in the wireless network list. W indows XP SP1: Click Refresh to reload and search for available wireless devices within transmission range.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 67 If there is no security activated for the se lected wireless ne twork, a warning screen appears.
ZyXEL G-120 User’s Guide 68 Appendix B Management with Wireless Zero Configuration Association Select a network in the Preferred networks lis t and click Properties to view or configure security . Figure 44 Windows XP : Wireless (netwo rk) properties: Association The following table describes the labels in this screen.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 69 Authentication Click the Authentication tab in the Wir eless (network) prop erties screen to display the screen shown next. Th e fields on thi s screen ar e grayed out when the network is in Ad-Hoc mode or data encryption is disabled.
ZyXEL G-120 User’s Guide 70 Appendix B Management with Wireless Zero Configuration Authentication Properties Select an EAP authen tication type in the W ireless (network) properties: Authentication screen and clic k the Properties button to display th e following screen.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 71 The following table describes the labels in this screen. Smart Card or other Certificate Proper t ies Figure 47 Win.
ZyXEL G-120 User’s Guide 72 Appendix B Management with Wireless Zero Configuration The following table describes the labels in this screen. Ordering the Preferred Networks Follow the steps below to manage y our preferred networks.
ZyXEL G-120 User’s Guide Appendix B Management with Wireless Zero Configuration 73 Figure 48 Windows XP SP2: Wireles s Networks: Pr eferred Net works W indows XP SP1: In the W ireless Network Connection S tatus screen, click Properties and the Wireless Networks tab to open the sc reen as shown.
ZyXEL G-120 User’s Guide 74 Appendix B Management with Wireless Zero Configuration.
ZyXEL G-120 User’s Guide Appendix C Wir eless Security 75 A PPENDIX C W ireless Security T ypes of EAP Authentication This section discusses some popular authen tication types: EAP-MD5, EAP-TLS, EAP-TTLS, PEAP and LEAP . Y our wireless LAN device may not support all authentication types.
ZyXEL G-120 User’s Guide 76 Appendix C Wireless Security EAP-TLS (T ransport Layer Security) W ith EAP-TLS, digital certifications are needed by both the server and the wireless stations for mutual authentication. The server presents a certificate to the client.
ZyXEL G-120 User’s Guide Appendix C Wir eless Security 77 For added security , certificate-based authen tications (EAP-TLS, EAP-TTLS and PEAP) use dynamic keys for data encryption. They are ofte n deployed in corporate environments, but for public deployment, a simp le user name and p assword pair is more practical.
ZyXEL G-120 User’s Guide 78 Appendix C Wireless Security TKIP uses 128-bit keys that are dyna mically genera ted and distributed by the authe ntication server . AES (Advanced Encryption Standard) is a block cipher that uses a 256-bit mathematical algorithm called Rijndael.
ZyXEL G-120 User’s Guide Appendix C Wir eless Security 79 WP A(2)-PSK Application Example A WP A(2)s -PSK applica tion looks as follows. 1 First enter identical passwords into the AP an d all wireless c lients. The Pre-Shared Key (PSK) must consist of between 8 and 63 ASCII characters or 64 hexadecimal characters (including spaces and symbols).
ZyXEL G-120 User’s Guide 80 Appendix C Wireless Security Figure 51 WP A(2) with RADIUS Application Example Security Parameters Summary Refer to this table to see what other secur ity parameters you should co nfigure for each Authentication Method/ key management prot ocol type.
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 81 A PPENDIX D Setting up Y our Computer ’ s IP Address All computers must have a 10M or 100M Et hernet adapter card and TCP/IP installed.
ZyXEL G-120 User’s Guide 82 Appendix D Setting up Your Computer’s IP Address Figure 52 WIndows 95/98/Me: Network: Co nfiguration Inst alling Component s The Network window Configuration tab displays a list of installed components. Y ou need a network adapter , the TCP/IP protocol and Client for Microso ft Networks.
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 83 3 Select Microsoft from the list of manufacturers. 4 Select Client for Microsoft Networks from the list of network clients and then click OK . 5 Restart your computer so the changes you made take ef fect.
ZyXEL G-120 User’s Guide 84 Appendix D Setting up Your Computer’s IP Address Figure 54 Windows 95/98/Me: TCP/IP Properties: DNS Configuration 4 Click the Gateway tab. • If you do not know your gateway’ s IP address, remove previously installed gateways.
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 85 Figure 55 Windows XP : S tart Menu 2 For W indows XP , click Network Connections . For W indows 2000/NT , click Network and Dial-up Connections . Figure 56 Windows XP: Control Panel 3 Right-click Local Area Connection and then click Pr operties .
ZyXEL G-120 User’s Guide 86 Appendix D Setting up Your Computer’s IP Address Figure 57 Windows XP: Control Panel: Network Connections: Properties 4 Select Internet Protocol (TCP/IP) (under the Genera l tab in W in XP) and click Properties .
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 87 • If you have a static IP address click Use the following IP Address and fill in the IP addr ess , Subnet mask , and Default gateway fields.
ZyXEL G-120 User’s Guide 88 Appendix D Setting up Your Computer’s IP Address • Click Obtain DNS server address automatically if you do not know your DNS server IP addre ss(es).
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 89 Figure 61 Macintosh OS 8/9: Apple Menu 2 Select Ethernet built-in from the Connect via list. Figure 62 Macintosh OS 8/9: TCP/IP 3 For dynamically assigned settings, select Using DHCP Server from the Configur e: list.
ZyXEL G-120 User’s Guide 90 Appendix D Setting up Your Computer’s IP Address 4 For statically assigned settings, do the following: •F r o m t h e Configure box, select Manually . • T ype your IP address in the IP Address bo x. • T ype your subnet mask in the Subnet mask box.
ZyXEL G-120 User’s Guide Appendix D Setting up Your Computer’s IP Address 91 Figure 64 Macintosh OS X: Network 4 For statically assigned settings, do the following: •F r o m t h e Configure box, select Manually . • T ype your IP address in the IP Address bo x.
ZyXEL G-120 User’s Guide 92 Appendix D Setting up Your Computer’s IP Address.
ZyXEL G-120 User’s Guide Index 93 Index A About 55 About your G-120 19 access point 29 access point. See also AP . activating a profile 52 Adapter 52 Ad-Hoc 20 , 49 Advanced Encryption St andard 32 , 77 advanced settings 52 antenna power output 61 AP 29 AP .
ZyXEL G-120 User’s Guide 94 Index M Message Integrity Check (MIC) 32 , 77 N network type 38 O One-T ouch Intelligent Security T echnology 32 open system authentication 31 OTIST Introducti on 32 P P .
ZyXEL G-120 User’s Guide Index 95 W WEP 30 , 41 manual setup 31 , 42 passphrase 30 , 41 WEP (Wired Equivalent Priva cy) 30 WEP Encryption 41 Wi-Fi Protected Access 32 , 77 Windows XP 21 wireless cli.
An important point after buying a device ZyXEL Communications G-120 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought ZyXEL Communications G-120 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data ZyXEL Communications G-120 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, ZyXEL Communications G-120 you will learn all the available features of the product, as well as information on its operation. The information that you get ZyXEL Communications G-120 will certainly help you make a decision on the purchase.
If you already are a holder of ZyXEL Communications G-120, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime ZyXEL Communications G-120.
However, one of the most important roles played by the user manual is to help in solving problems with ZyXEL Communications G-120. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device ZyXEL Communications G-120 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
