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Chapter 4 Troubleshooting 

This section provides solutions to problems usually encountered during the installation and operation 

of this Wireless USB Adaptor. Read the description below to solve your problems. 

What is the IEEE 802.11b standard? 

The IEEE 802.11b Wireless LAN standards subcommittee, which is formulating a standard for 

the industry. The objective is to enable wireless LAN hardware from different manufactures to 

communicate. 

What IEEE 802.11 feature are supported? 

The product supports the following IEEE 802.11 functions: 

 --CSMA/CA plus Acknowledge protocol 

 --Multi-Channel Roaming 

 --Automatic  Rate Selection 

 --RTS/CTS feature 

--Fragmentation 

 --Power Management 

What is Ad-hoc? 

An Ad-hoc integrated wireless LAN is a group of computers, each with a WLAN adapter, 

connected as an independent wireless LAN. Ad hoc wireless LAN is applicable at a 

departmental scale for a branch or SOHO operation. 

What is Infrastructure? 

An integrated wireless and wireless and wired LAN is called an Infrastructure configuration. 

Infrastructure is applicable to enterprise scale for wireless access to central database, or 

wireless application for mobile workers. 

What is BSS ID? 

A specific Ad hoc LAN is called a Basic Service Set (BSS). Computers in a BSS must be 

configured with the same BSS ID. 

What is WEP? 

WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 40 or 104 bit shared 

key algorithm, as described in the IEEE 802 .11 standard. 

Can Wireless products support printer sharing? 

Wireless products perform the same function as LAN products. Therefore, Wireless products 

can work with Netware, Windows NT/2000/XP, or other LAN operating systems to support 

printer or file sharing. 

Would the information be intercepted while transmitting on air? 

WLAN features two-fold protection in security. On the hardware side, as with Direct Sequence 

Spread Spectrum technology, it has the inherent security feature of scrambling. On the 

software side, WLAN series offer the encryption function (WEP) to enhance security and 

Access Control. Users can set it up depending upon their needs. 

What is DSSS?    What is FHSS?    And what are their differences? 

Frequency-hopping spread-spectrum (FHSS) uses a narrowband carrier that changes 

frequency in a pattern that is known to both transmitter and receiver. Properly synchronized, 

the net effect is to maintain a single logical channel. To an unintended receiver, FHSS appears 

to be short-duration impulse noise. Direct-sequence spread-spectrum (DSSS) generates a 

redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip (or chipping 

code). The longer the chip, the greater the probability that the original data can be recovered. 

Even if one or more bits in the chip are damaged during transmission, statistical techniques 

embedded in the radio can recover the original data without-the need for retransmission. To an 

unintended receiver, DSSS appears as low power wideband noise and is rejected (ignored) by 

most narrowband receivers. 

What is Spread Spectrum?

 

Spread Spectrum technology is a wideband radio frequency technique developed by the 

military for use in reliable, secure, mission-critical communication systems. It is designed to 

trade off bandwidth efficiency for reliability, integrity, and security. In other words, more 

bandwidth is consumed than in the case of narrowband transmission

,

 but the trade off 

Summary of Contents for Wireless USB Adapter WL-U350

Page 1: ...Wireless USB Adapter WL U350 User s Manual Version 1 0 Networking Communication ...

Page 2: ...limits for a Class B digital device pursuant to Part 15 of FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no gua...

Page 3: ... Equipment As of April 8 2000 Safety This equipment is designed with the utmost care for the safety of those who install and use it However special attention must be paid to the dangers of electric shock and static electricity when working with electrical equipment All guidelines of this and of the computer manufacture must therefore be allowed at all times to ensure the safe use of the equipment ...

Page 4: ...m System Requirements 8 SAFETY PRECAUTION 8 CHAPTER 2 INSTALLATION PROCEDURE 9 2 1 Windows 98 Me 2000 Installation 9 2 2 Windows XP Installation 13 CHAPTER 3 CONFIGURATION UTILITY 15 3 1 Status 15 3 2 Statistics 16 3 3 Site Survey 17 3 4 Encryption 17 3 5 Advanced 18 3 6 Version 18 CHAPTER 4 TROUBLESHOOTING 19 ...

Page 5: ...erage is up to 300 feet indoor and 800 feet outdoors Features 2 4GHz ISM band unlicensed operation Wireless connection without the hassles and cost of cabling Wireless LAN IEEE 802 11b compliant Up to 11Mbps data rate with CSMA CA Utilize Direct Sequence Spread Spectrum DSSS Technology to provide robust interference resistant solution in a multi user environment Working range up to 300 feet indoor...

Page 6: ... users More than one BSS can be configured as an Extended Service Set ESS The continuous network allows users to roam freely within an ESS All WL U350 PCs or other IEEE 802 11b compliant wireless adapter within one ESS must be configured with the same ESS ID and use the same radio channel Before enabling an ESS with roaming capability choosing a feasible radio channel and optimum Access Point posi...

Page 7: ...ss to database while being mobile in the hospital retail store or office campus 6 SOHO Small Office and Home Office users SOHO users need easy and quick installation of a small computer network 7 High security connection The wireless security network installs quickly and provides the flexibility to reconfigure easily Specification Product Wire Free Wireless LAN 11Mbps USB Adapter Models WL U350 At...

Page 8: ...able One CD Based software Including the Wireless LAN Management Utility Driver and User s Manual One Quick Installation Guide If any of the above items are missing contact your supplier as soon as possible Minimum System Requirements Before installation please check the following requirements with your equipment Pentium Based above IBM compatible PC system with an USB support CD ROM drive One Ava...

Page 9: ... 2000 Procedures will be the same for Windows 98 ME Note If you ever install the Wireless USB Adapter before please uninstall the old driver and utility first If this is the first time to install the Wireless USB Adapter please continue from A step to use the Wizard to continue A Insert Drivers and user s manual CD to your CD drive Suppose D B Run setup exe under D Utility WL U350 directory or cli...

Page 10: ...ility uninstall the utility before click Next E To install to this folder in program files click Next To install to a different folder click Browse and select another folder Then click Next F You can change the Program Folder name as you wish or use the default name to continue Click Next to continue ...

Page 11: ...Hoc or Infrastructure then click Next 1 Ad Hoc mode In this mode you will be asked to set ESSID and the Channel as desired Then click Next to complete the setting 2 Infrastructure In this mode you will be asked to specify the ESSID only and click Next to complete the setting ...

Page 12: ... files Use bundled USB cable to connect WL U350 to your PC or Notebook s USB port J Windows will automatically detect WL U350 For a while this dialog box will appear Please click Yes to continue the driver installation K After the driver installation the completing window appears Please click Finish and restart the computer ...

Page 13: ...tion Windows XP have provided a interface to configure our WL U350 Thus you should only install the driver for Windows XP A Insert the WL U350 to your computer Windows XP will automatically detect the adapter and show the following window Select Install from a list or specific location Advanced and click Next B Insert Drivers and User s manual CD to your CD drive suppose D Select Include the locat...

Page 14: ...ws XP s built in utility to configure the WL U350 Please click the Start button and choose Connect To Select the Wireless Network Connection and the Connect to Wireless Network dialog box will appear Select preferred Wireless Network and click Connect or click Advanced for further configuration F For more information on configuring the wireless card Please refer to Windows XP s on line help or nex...

Page 15: ...change the following configuration parameters when the device is active Note Click the Exit button will exit the configuration application 3 1 Status Click the Change tab when set up the necessary parameters and click Submit after the configuration has been changed Operation mode Shows the following network modes Infrastructure This operation mode requires the presence of an 802 11 Access Point Al...

Page 16: ... bar shows the signal strength level The higher the blue bar the more radio signal been received by the Wireless USB adaptor This indicator helps to find the most comfortable antenna workstation position for quality network operation Link quality The measured Signal Strength level gives the overall Link Quality and Connection Status MAC Address The MAC Address of the Wireless USB Adaptor Unique 48...

Page 17: ...ional security can be achieved by using the WEP Wired Equivalent Privacy encryption WEP encrypts each frame transmitted from the radio using one of the keys entered from this panel There are four 10 Hex digit encryption keys value available for the WEP One can define the encryption key values of their own choice Enable the WEP Wired Equivalent Privacy option in order to activate WEP encryption for...

Page 18: ...ble The Short Preamble option improves throughput performance Fragmentation threshold The size at which packets will be fragmented Choose a setting within a range of 256 to 2346 bytes RTS Threshold Minimum packet size to require an RTS Request To Send For packets smaller than this threshold an RTS is not sent and the packet is transmitted directly to the WLAN This is the option for the RTS Thresho...

Page 19: ...work with Netware Windows NT 2000 XP or other LAN operating systems to support printer or file sharing Would the information be intercepted while transmitting on air WLAN features two fold protection in security On the hardware side as with Direct Sequence Spread Spectrum technology it has the inherent security feature of scrambling On the software side WLAN series offer the encryption function WE...

Page 20: ...eceiver knows the parameters of the spread spectrum signal being broadcast If a receiver is not tuned to the right frequency a spread spectrum signal looks like background noise There are two main alternatives Direct Sequence Spread Spectrum DSSS and Frequency Hopping Spread Spectrum FHSS ...

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