Cisco Linksys NWU11B Wireless USB Network Adapter User Manual NWU11B user guide 5

Cisco-Linksys, LLC Wireless USB Network Adapter NWU11B user guide 5

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Manual 2

Wireless USB Adapter23Network Everywhere®Connect - To connect to one of the networks on the list, select the wireless net-work,and click the Connect button. If the wireless network has WEP encryp-tion enabled, you will see the screen shown in Figure 8-5.In the WEP drop-down box, select the type of WEP encryption used by thewireless network: 64-bit, 128-bit, or 152-bit WEP.If the wireless network uses a passphrase, enter the passphrase in thePassphrase field. If the wireless network uses a WEP key, enter the WEP keyin the Key 1 field. Click the OK button to complete the network connection and return to the SiteSurvey screen, or click the Cancel button to cancel the network connection andreturn to the Site Survey screen.On the Site Survey screen, click the X (Close) button in the upper right cornerto exit the WLAN Monitor.22The Profiles screen lets you save different configuration profiles for differentnetwork setups. You can also import or export profiles. The default profileholds the initial configuration saved when you ran the Setup Wizard.Profile - Name of the connection profile.SSID - The wireless network’s unique name, as set in the connection profile.Profile InformationNetwork Type - The mode of the wireless network currently in use.Transfer Rate - The data transfer rate of the current connection. (In Automode, the Adapter dynamically shifts to the fastest data transfer rate possibleat any given time.)Channel - The channel to which the wireless network devices are set. WEP - The status of the WEP encryption security feature.Connect - To connect to a wireless network using a specific profile, select theprofile,and click the Connect button. Edit - Select a profile, and click the Edit button to change an existing profile. New - Click the New button to create a new profile. See the next section,“Creating a New Profile,” for detailed instructions.Figure 8-6ProfilesFigure 8-5
Wireless USB Adapter1. On the Profiles screen, click the New button to create a new profile.2. The Choose a network type screen shows a choice of two wireless modes(see Figure 8-10). In the Current Profile field, enter the name of the newprofile. Click the Infrastructure Mode radio button if you want your wire-less computers to communicate with computers on your wired network viaa wireless access point. Click the Ad-Hoc Mode radio button if you wantmultiple wireless computers to communicate directly with each other.Complete the SSID field. Click the Next button to continue or the Backbutton to return to the previous screen.Current Profile - Enter the name of this profile here.Infrastructure Mode - This mode allows wireless and wired networks tocommunicate through an access point.Ad-Hoc Mode - This mode allows wireless-equipped computers to com-municate directly with each other. No access point is used.SSID - The SSID is the unique name shared by all devices in a wireless net-work. The SSID must be identical for all devices in the wireless network. Itis case-sensitive and must not exceed 32 characters (use any of the charac-ters on the keyboard). Make sure this setting is the same for all devices inyour wireless network.25Network Everywhere®24Creating a New ProfileFigure 8-9Import - Click the Import button to import a profile that has been saved inanother location. Select the appropriate file, and click the Open button.Export - To save the profile(s) in a different location, click the Export button.Direct Windows to the appropriate folder, and click the Save button.Delete - Click the Delete button to delete a profile. Click the X (Close) button in the upper right corner to exit the WLAN Monitor.Figure 8-7Figure 8-8Note: If you want to export more than one profile, you have to exportthem one at a time.
Wireless USB Adapter27Network Everywhere®3. If you chose Infrastructure Mode, go to Step 4 now. If you chose Ad-HocMode, select the correct operating channel for your network. Click the Nextbutton, and go to Step 4. Click the Back button to change any settings.Channel - The channel you choose should match the channel set on theother devices in your wireless network. 264. The Network Settings screen will appear.If your network has a DHCP server, click the radio button next to Obtainan IP address automatically (DHCP). Click the Next button to continue,or click the Back button to return to the previous screen. Then go to Step 5. If your network does not have a DHCP server, click the radio button next toSpecify the IP address. Enter an IP Address, Subnet Mask, DefaultGateway, and DNS appropriate for your network. Enter each address in thisformat: xxx.xxx.xxx.xxx (the x’s represent the numbers that make up eachaddress). You must specify the IP Address and Subnet Mask on this screen.If you are unsure about the Default Gateway and DNS addresses, then leavethese fields alone. Click the Next button to continue, or click the Back but-ton to return to the previous screen. Then go to Step 5. IP Address - This IP Address must be unique to your network. Subnet Mask - The Adapter’s Subnet Mask must be the same as your wirednetwork’s Subnet Mask.Default Gateway - Enter the IP address of your network’s Gateway here. DNS - Enter the DNS addresses of your Ethernet (wired) network here. Figure 8-12Figure 8-10Figure 8-11
Wireless USB Adapter29Network Everywhere®5. The Security Settings screen will appear. Enable or disable WiredEquivalent Privacy (WEP) encryption for your wireless network. If youenable WEP, enter a Passphrase or WEP key. Click the Next button to con-tinue or the Back button to return to the previous screen.WEP (Disabled/64-bit WEP/128-bit WEP) - If you do not want to useWEP encryption, choose Disabled. To use WEP encryption (recommendedto increase network security), select 64-bit or 128-bit WEP from the drop-down menu, and enter either a Passphrase or WEP key. Passphrase - Instead of manually entering WEP keys, you can enter aPassphrase, so a WEP key is automatically generated. It is case-sensitive andshould not be longer than 16 alphanumeric characters. This passphrase mustmatch the passphrase of your wireless network and is compatible withNetwork Everywhere wireless products only. (If you have any non-NetworkEverywhere wireless products, enter the WEP key(s) manually on thoseproducts.) Key 1 - This WEP key must match the WEP key of your wireless network.If you are using 64-bit WEP encryption, then the key must consist of exact-ly 10 hexadecimal characters. If you are using 128-bit WEP encryption,then the key must consist of exactly 26 hexadecimal characters. Valid hexa-decimal characters are “0” to “9” and “A” to “F”.286. The Confirm New Settings screen will appear. To save the new settings,click the Next button. To cancel the settings and return to the Profilesscreen, click the No button. To edit the new settings, click the Back button.7. The Congratulations screen will appear next. Click Activate Now to imple-ment the new settings immediately and return to the Link Informationscreen. Click Activate Later to keep the current settings active and returnto the Profiles screen. You have successfully created a connection profile. Click the X (Close)button in the upper right corner to exit the WLAN Monitor.Figure 8-14Figure 8-15Figure 8-13
Wireless USB Adapter31Network Everywhere®Appendix A:TroubleshootingThis chapter provides solutions to problems that may occur during the installa-tion and operation of the Wireless USB Adapter. Read the descriptions belowto solve your problems. If you can’t find an answer here, check the NetworkEverywhere website at www.networkeverywhere.com.1.My computer does not recognize the Wireless USB Adapter.• Make sure that the Adapter is properly inserted into the USB port.• Also, make sure that the USB Controller is enabled in the BIOS. Refer toyour motherboard’s user guide for more information.2.The Wireless USB Adapter does not work properly.• Reinsert the Adapter into the notebook or desktop’s USB port. • For Windows 98SE or Me, right-click My Computer, and select Properties.Select the Device Manager tab, and select the Adapter. You will find theWireless USB Adapter if it has been installed successfully. If you see a yel-low exclamation mark, the resources may be in conflict, and you must followthe steps below:• Uninstall the driver software from your PC.• Restart your PC and repeat the hardware and software installation as spec-ified in this User Guide.3.I cannot communicate with a wired computer linked via an access point in theinfrastructure configuration.• Make sure that the notebook or desktop PC is powered on.• Make sure that the Adapter is configured with the same SSID and securityoptions as the other computers in the infrastructure configuration.Can I run an application from a remote computer over the wireless network?This will depend on whether or not the application is designed to be used overa network. Consult the application’s user guide to determine if it supports oper-ation over a network.Can I play computer games with other members of the wireless network?Yes, as long as the game supports multiple players over a LAN (local area net-work). Refer to the game’s user guide for more information.30What is the IEEE 802.11b standard?It is one of the IEEE standards for wireless networks. The 802.11b standardallows wireless networking hardware from different manufacturers to commu-nicate, provided that the hardware complies with the 802.11b standard. The802.11b standard states a maximum data transfer rate of 11Mbps and an oper-ating frequency of 2.4GHz.What IEEE 802.11b features are supported?The product supports the following IEEE 802.11b functions: • CSMA/CA plus Acknowledge protocol • Multi-Channel Roaming • Automatic Rate Selection • RTS/CTS feature • Fragmentation • Power Management What is ad-hoc mode?When a wireless network is set to ad-hoc mode, the wireless-equipped com-puters are configured to communicate directly with each other. The ad-hocwireless network will not communicate with any wired network. What is infrastructure mode?When a wireless network is set to infrastructure mode, the wireless network isconfigured to communicate with a wired network through a wireless accesspoint.What is roaming?Roaming is the ability of a portable computer user to communicate continu-ously while moving freely throughout an area greater than that covered by a sin-gle access point. Before using the roaming function, the workstation must makesure that it is the same channel number with the access point of dedicated cov-erage area. To achieve true seamless connectivity, the wireless LAN must incorporate anumber of different functions. Each node and access point, for example, mustalways acknowledge receipt of each message. Each node must maintain contactwith the wireless network even when not actually transmitting data. Achievingthese functions simultaneously requires a dynamic RF networking technologythat links access points and nodes. In such a system, the user’s end node under-takes a search for the best possible access to the system. First, it evaluates suchfactors as signal strength and quality, as well as the message load currently Common Problems and SolutionsFrequently Asked Questions
Wireless USB Adapter33Network Everywhere®32Would the information be intercepted while transmitting on air?WLAN features two-fold protection in security. On the hardware side, as withDirect Sequence Spread Spectrum technology, it has the inherent security fea-ture of scrambling. On the software side, WLAN offers the encryption function(WEP) to enhance security and access control.What is WEP?WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bitor 128-bit shared key algorithm, as described in the IEEE 802.11 standard.being carried by each access point and the distance of each access point to thewired backbone. Based on that information, the node next selects the rightaccess point and registers its address. Communications between end node andhost computer can then be transmitted up and down the backbone.As the user moves on, the end node’s RF transmitter regularly checks the sys-tem to determine whether it is in touch with the original access point or whetherit should seek a new one. When a node no longer receives acknowledgmentfrom its original access point, it undertakes a new search. Upon finding a newaccess point, it then re-registers, and the communication process continues.What is ISM band?The FCC and their counterparts outside of the U.S. have set aside bandwidthfor unlicensed use in the ISM (Industrial, Scientific and Medical) band.Spectrum in the vicinity of 2.4 GHz, in particular, is being made availableworldwide. This presents a truly revolutionary opportunity to place convenienthigh-speed wireless capabilities in the hands of users around the globe. What is Spread Spectrum?Spread Spectrum technology is a wideband radio frequency technique devel-oped by the military for use in reliable, secure, mission-critical communica-tions systems. It is designed to trade off bandwidth efficiency for reliability,integrity, and security. In other words, more bandwidth is consumed than in thecase of narrowband transmission, but the trade-off produces a signal that is, ineffect, louder and thus easier to detect, provided that the receiver knows theparameters of the spread-spectrum signal being broadcast. If a receiver is nottuned to the right frequency, a spread-spectrum signal looks like backgroundnoise. There are two main alternatives, Direct Sequence Spread Spectrum(DSSS) and Frequency Hopping Spread Spectrum (FHSS).What is DSSS? What is FHSS? And what are their differences?Frequency-Hopping Spread-Spectrum (FHSS) uses a narrowband carrier thatchanges frequency in a pattern that is known to both transmitter and receiver.Properly synchronized, the net effect is to maintain a single logical channel. Toan unintended receiver, FHSS appears to be short-duration impulse noise.Direct-Sequence Spread-Spectrum (DSSS) generates a redundant bit patternfor each bit to be transmitted. This bit pattern is called a chip (or chippingcode). The longer the chip, the greater the probability that the original data canbe recovered. Even if one or more bits in the chip are damaged during trans-mission, statistical techniques embedded in the radio can recover the originaldata without the need for retransmission. To an unintended receiver, DSSSappears as low power wideband noise and is rejected (ignored) by most nar-rowband receivers.
Wireless USB Adapter35Network Everywhere®34DHCP supports static addresses for computers containing Web servers thatneed a permanent IP address. DNS - The domain name system (DNS) is the way that Internet domain nameare located and translated into Internet Protocol (IP) addresses. A domain nameis a meaningful and easy-to-remember “handle” for an Internet address. DSSS (Direct-Sequence Spread Spectrum) - DSSS generates a redundant bitpattern for all transmitted data. This bit pattern is called a chip (or chippingcode). Even if one or more bits in the chip are damaged during transmission,statistical techniques embedded in the receiver can recover the original datawithout the need for retransmission. To an unintended receiver, DSSS appearsas low power wideband noise and is rejected (ignored) by most narrowbandreceivers. However, to an intended receiver (i.e. another wireless LAN end-point), the DSSS signal is recognized as the only valid signal, and interferenceis inherently rejected (ignored).Dynamic IP Address - An IP address that is automatically assigned to a clientstation in a TCP/IP network, typically by a DHCP server. Network devices thatserve multiple users, such as servers and printers, are usually assigned static IPaddresses. ESS (Extended Service Set) - A set of more than two or more BSSs (multipleaccess points) forming a single network.Firmware - Code that is written onto read-only memory (ROM) or program-mable read-only memory (PROM). Once firmware has been written onto theROM or PROM, it is retained even when the device is turned off.IEEE - The Institute of Electrical and Electronics Engineers. The IEEEdescribes itself as “the world’s largest technical professional society—promot-ing the development and application of electrotechnology and allied sciencesfor the benefit of humanity, the advancement of the profession, and the well-being of our members.” The IEEE fosters the development of standards that often become national andinternational standards. The organization publishes a number of journals, hasmany local chapters, and several large societies in special areas, such as theIEEE Computer Society. Infrastructure Network - An infrastructure network is a group of computersor other devices, each with a wireless adapter, connected as an 802.11 wirelessAppendix B:Glossary802.11b - One of the IEEE standards for wireless networking hardware.Products that adhere to a specific IEEE standard will work with each other,even if they are manufactured by different companies. The 802.11b standardspecifies a maximum data transfer rate of 11Mbps, an operating frequency of2.4GHz, and WEP encryption for security. 802.11b networks are also referredto as Wi-Fi networks.Ad-hoc Network - An ad-hoc network is a group of computers, each with awireless adapter, connected as an independent 802.11 wireless LAN. Ad-hocwireless computers operate on a peer-to-peer basis, communicating directlywith each other without the use of an access point. Ad-hoc mode is alsoreferred to as an Independent Basic Service Set (IBSS) or as peer-to-peermode, and is useful at a departmental scale or SOHO operation.CTS (Clear To Send) - An RS-232 signal sent from the receiving station to thetransmitting station that indicates it is ready to accept data.Default Gateway - The router used to forward all traffic that is not addressedto a station within the local subnet.DHCP (Dynamic Host Configuration Protocol) - A protocol that lets networkadministrators manage centrally and automate the assignment of InternetProtocol (IP) addresses in an organization’s network. Using the Internet’s set ofprotocol (TCP/IP), each machine that can connect to the Internet needs aunique IP address. When an organization sets up its computer users with a con-nection to the Internet, an IP address must be assigned to each machine.Without DHCP, the IP address must be entered manually at each computer and,if computers move to another location in another part of the network, a new IPaddress must be entered. DHCP lets a network administrator supervise and dis-tribute IP addresses from a central point and automatically sends a new IPaddress when a computer is plugged into a different place in the network. DHCP uses the concept of a “lease” or amount of time that a given IP addresswill be valid for a computer. The lease time can vary depending on how long auser is likely to require the Internet connection at a particular location. It’s espe-cially useful in education and other environments where users change fre-quently. Using very short leases, DHCP can dynamically reconfigure networksin which there are more computers than there are available IP addresses.
Wireless USB Adapter37Network Everywhere®36Roaming - In an infrastructure mode wireless network, this refers to the abili-ty to move out of one access point's range and into another and transparentlyreassociate and reauthenticate to the new access point. This reassociation andreauthentication should occur without user intervention and ideally withoutinterruption to network connectivity. A typical scenario would be a locationwith multiple access points, where users can physically relocate from one areato another and easily maintain connectivity.SSID (Service Set Identifier) - An identification name that wireless devicesuse to make connections. In order for wireless devices to communicate, theymust all be set to the same channel and they all must use the same SSID. Forinstance, if you are using an access point to connect two computers using wire-less devices, the access point and each of the wireless devices must use thesame SSID. Even if they are set to the same channel, they cannot communicateunless the SSID is the same. Static IP Address - A permanent IP address that is assigned to a node in aTCP/IP network. Subnet Mask - The method used for splitting IP networks into a series of sub-groups, or subnets. The mask is a binary pattern that is matched up with the IPaddress to turn part of the host ID address field into a field for subnets. TCP (Transmission Control Protocol) - A method (protocol) used along withthe IP (Internet Protocol) to send data in the form of message units (datagram)between network devices over a LAN or WAN. While IP takes care of handlingthe actual delivery of the data (routing), TCP takes care of keeping track of theindividual units of data (called packets) that a message is divided into for effi-cient delivery over the network. TCP is known as a “connection-oriented” pro-tocol due to requiring the receiver of a packet to return an acknowledgment ofreceipt to the sender of the packet resulting in transmission control.TCP/IP (Transmission Control Protocol/Internet Protocol) - The basic com-munication language or set of protocols for communications over a network(developed specifically for the Internet). TCP/IP defines a suite or group ofprotocols and not only TCP and IP.UDP (User Datagram Protocol) - A method (protocol) used along with the IP(Internet Protocol) to send data in the form of message units (datagram)between network devices over a LAN or WAN. While IP takes care of handlingthe actual delivery of the data (routing), UDP takes care of keeping track of theindividual units of data (called packets) that a message is divided into for effi-LAN. In infrastructure mode, the wireless devices communicate with eachother and to a wired network by first going through an access point. An infra-structure wireless network connected to a wired network is referred to as aBasic Service Set (BSS). A set of two or more BSS in a single network isreferred to as an Extended Service Set (ESS). Infrastructure mode is useful ata corporation scale, or when it is necessary to connect the wired and wirelessnetworks.IP Address - In the most widely installed level of the Internet Protocol (IP)today, an IP address is a 32-binary digit number that identifies each sender orreceiver of information that is sent in packet across the Internet. When yourequest an HTML page or send e-mail, the Internet Protocol part of TCP/IPincludes your IP address in the message (actually, in each of the packets if morethan one is required) and sends it to the IP address that is obtained by lookingup the domain name in the Uniform Resource Locator you requested or in thee-mail address you're sending a note to. At the other end, the recipient can seethe IP address of the Web page requester or the e-mail sender and can respondby sending another message using the IP address it received. IPCONFIG - A utility that provides for querying, defining and managing IPaddresses within a network. A commonly used utility, under Windows NT and2000, for configuring networks with static IP addresses.ISP - An ISP (Internet service provider) is a company that provides individualsand companies access to the Internet and other related services such as Web sitebuilding and virtual hosting. LAN - A local area network (LAN) is a group of computers and associateddevices that share a common communications line and typically share theresources of a single processor or server within a small geographic area (forexample, within an office building). MAC Address - The MAC (Media Access Control) address is your computer’sunique hardware number. mIRC - mIRC runs under Windows and provides a graphical interface for log-ging onto IRC servers and listing, joining and leaving channels.Network Mask - Also known as the “Subnet Mask.”Plug-and-Play - The ability of a computer system to configure expansionboards and other devices automatically without requiring the user to turn offthe system during installation.
Wireless USB Adapter39Network Everywhere®38Appendix C:SpecificationsStandards IEEE 802.11b, USB 1.1Channels 11 Channels (USA)Port USBTransmit 18 dBm(typical)Receive Sensitivity -84 dBm(typical)Modulation CCK, DQPSK, DBPSKNetwork Protocols TCP/IPLEDs Link, Powercient delivery over the network. UDP is known as a “connection-less” protocoldue to NOT requiring the receiver of a packet to return an acknowledgment ofreceipt to the sender of the packet (as opposed to TCP).WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit shared key algorithm, as described in the IEEE 802.11b standard. WINIPCFG - Configuration utility based on the Win32 API for querying,defining and managing IP addresses within a network. A commonly used util-ity under Windows 95, 98, and Me.WLAN (Wireless Local Area Network) - A group of computers and associat-ed devices that communicate with each other wirelessly.
Wireless USB Adapter41Network Everywhere®Dimensions 3.58" x 2.80" x 0.91" (91 mm x 71 mm x 23 mm)Unit Weight 2.82 oz. (0.08 kg)Power Supplied by PC’s USB portCertifications FCC Class B,Wi-FiOperating Temp. 32ºF to 131ºF (0ºC to 55ºC)Storage Temp. -13ºF to 158ºF (-25ºC to 70ºC)Operating Humidity 0% to 70%, Non-CondensingStorage Humidity 10% to 90%, Non-Condensing40Appendix D:Warranty InformationBE SURE TO HAVE YOUR PROOF OF PURCHASE AND A BARCODEFROM THE PRODUCT’S PACKAGING ON HAND WHEN CALLING.RETURN REQUESTS CANNOT BE PROCESSED WITHOUT PROOF OFPURCHASE. IN NO EVENT SHALL NETWORK EVERYWHERE’S LIABILITYEXCEED THE PRICE PAID FOR THE PRODUCT FROM DIRECT, INDI-RECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGESRESULTING FROM THE USE OF THE PRODUCT, ITS ACCOMPANYINGSOFTWARE, OR ITS DOCUMENTATION. NETWORK EVERYWHEREDOES NOT OFFER REFUNDS FOR ANY PRODUCT. NETWORK EVERYWHERE OFFERS CROSS SHIPMENTS, A FASTERPROCESS FOR PROCESSING AND RECEIVING YOUR REPLACEMENT.NETWORK EVERYWHERE PAYS FOR UPS GROUND ONLY. ALL CUS-TOMERS LOCATED OUTSIDE OF THE UNITED STATES OF AMERICAAND CANADA SHALL BE HELD RESPONSIBLE FOR SHIPPING ANDHANDLING CHARGES. PLEASE CALL NETWORK EVERYWHERE FORMORE DETAILS.Environmental
Network Everywhere®42Appendix E:Contact InformationFor help with the installation or operation of the Wireless USB Adapter, con-tact Network Everywhere Technical Support at one of the phone numbers orInternet addresses below.Technical Support 949-271-5470, M-F, 8:00 am to 5:00 pm (PST)Fax 949-265-6655E-mail support@NetworkEverywhere.comWeb site http://www.NetworkEverywhere.com
© Copyright 2002 Network Everywhere,All Rights Reserved.http://www.NetworkEverywhere.com
Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the 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 guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures: - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and receiver. - Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. - Consult the dealer or an experienced radio/TV technician for help. FCC Caution: To assure continued compliance, any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. IMPORTANT NOTE: FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

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