Linksys WMP54G
Contents
1. si r R Figure 7 12 The Security Settings screen Figure 7 13 will appear Enable or disable Wired Equivalent Privacy WEP encryption for your wireless network If you enable WEP enter a Passphrase or WEP key Click the Next button to continue or the Back button to return to the previous screen 23 24 WEP Disabled 64 bits WEP 128 bits WEP If you do not want to use WEP encryption choose Disabled To use WEP encryption recommended to increase network security select 64 bits or 128 bits WEP from the drop down menu and enter either a Passphrase or WEP key Passphrase Instead of manually entering WEP keys you can enter a Passphrase so that a WEP key is automatically generated It 1s case sensi tive and should not be longer than 16 alphanumeric characters This passphrase must match the passphrase of your wireless network and is com patible with other Linksys wireless products only If you have any non Linksys wireless products enter the WEP key s manually on those prod ucts 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 gt Wireless G PCI Adapter WLAN Monitor ve 1 2 LINKSYS A Ci2. e Linksys vakuuttaa t ten ett Wireless G PCI Adapter tyyppinen laite on direktiivin 1999 5 EY oleellisten vaatimusten ja sit koskevien n iden direktiivien muiden ehto jen mukainen e Linksys Group d clare le carte PCI sans fil G est conforme aux conditions essen tielles et aux dispositions relatives la directive 1999 5 EC e Dans le cas d une utilisation priv e l ext rieur d un b timent au dessus d un espace public aucun enregistrement n est n cessaire pour une distance de moins de 300m Pour une distance sup rieure 300m un enregistrement aupr s de l IBPT est requise Pour une utilisation publique l ext rieur de b timents une licence de l IBPT est requise Pour les enregistrements et licences veuillez contacter l IBPT e France F 2 4 GHz Bande les canaux 10 11 12 13 2457 2462 2467 et 2472 MHz respec tivement sont compl tement libres d utilisation en France en utilisation int rieur Pour ce qui est des autres canaux ils peuvent tre soumis autorisation selon le d partment L utilisation en ext rieur est soumis autorisation pr alable et tres restreint Vous pouvez contacter l Autorit de R gulation des T l communications http www art telecom fr pour de plus amples renseignements 2 4 GHz Band only channels 10 11 12 13 2457 2462 2467 and 2472 MHz respectively may be used freely in France for indoor use License required for out door installations Please contact ART h
3. DSL or cable systems or through leased lines or satellites In its most basic definition the Internet could be considered a WAN WEP Wired Equivalent Privacy A data privacy mechanism based on a 64 bit or 128 bit shared key algorithm as described in the IEEE 802 11 standard WLAN Wireless Local Area Network A group of computers and associat ed devices that communicate with each other wirelessly 37 Standards Modulation Channels 802 11b 802 119 Network Protocol Interface Transmit Power Sensitivity LED WEP Key Bits 802 119 802 11b 802 1 1b CCK 11 Mbps DQPSK 2 Mbps DBPSK 1 Mbps 802 119 OFDM 11 Channels USA 13 Channels most of Europe 14 Channels Japan TCP IP IPX NDIS 4 NDIS 5 NDIS 5 1 NetBEUI PCI 15 dBm 80 dBm ACT 64 Bit and 128 Bit Dimensions Unit Weight Certifications Operating Temp Storage Temp Operating Humidity Storage Humidity 122 mm x 220 mm x 23 mm 4 8 x 8 66 x 0 91 0 13 kg 4 5 oz FCC CE 0 C to 65 C 32 F to 150 F 40 C to 85 C 40 F to 185 F 0 to 95 Non Condensing 0 to 95 Non Condensing 39 40 Appendix D Warranty Information LIMITED WARRANTY Linksys warrants to the original end user purchaser You that for a period of two years the Warranty Period Your Linksys product will be free of defects in materials and workmanship under normal use Your exclusive remedy and Link
4. access point s range and into another and transparently reassociate and reauthenticate to the new access point This reassociation and reauthentication should occur without user intervention and ideally without interruption to network connectivity A typical scenario would be a location with multiple access points where users can physically relocate from one area to another and easily maintain connectivity RTS Request To Send An RS 232 signal sent from the transmitting station to the receiving station requesting permission to transmit 35 36 Server Any computer whose function in a network is to provide user access to files printing communications and other services Software Instructions for the computer A series of instructions that performs a particular task is called a program The two major categories of software are system software and application software System software is made up of control programs such as the operating system and database management sys tem DBMS Application software is any program that processes data for the user A common misconception is that software is data It is not Software tells the hardware how to process the data SOHO Small Office Home Office Market segment of professionals who work at home or in small offices Spread Spectrum Spread Spectrum technology is a wideband radio frequen cy technique developed by the military for use in reliable secure mission crit ical
5. and locate an available PCI slot on the motherboard Check with your computer manufacturer for instructions 3 Slide the PCI Adapter into the PCI slot Make sure that all of its pins are touching the slot s contacts You may have to apply a bit of pressure to slide the adapter all the way in After the adapter is firmly in place secure its fas tening tab to your PC s chassis with a mounting screw Then close your PC 4 Attach the external antenna to the adapter s antenna port 5 Power on your desktop PC You have now completed the hardware installation for the Adapter If you want to check the link information search for available wireless networks or make additional configuration changes proceed to Chapter 7 Using the WLAN Monitor for Windows 98SE Me and 2000 Chapter 7 Using the WLAN Monitor for Windows 985E Me and 2000 ioven Use the WLAN Monitor to check the link information search for available wireless networks or create profiles that hold different configuration settings Accessing the WLAN Monitor After installing the Adapter the WLAN Monitor icon will appear in your system tray Double click the icon see Figure 7 1 Figure 7 1 The Link Information screen Figure 7 2 will appear From this screen you can find out how strong the current wireless signal is and how good the connec tion s quality is You can also click the More Information button to view addi tional status information about t
6. and security 31 32 Driver A workstation or server software module that provides an interface between a network interface card and the upper layer protocol software running in the computer it is designed for a specific card and is installed during the initial installation of a network compatible client or server operating system DSSS Direct Sequence Spread Spectrum DSSS generates a redundant bit pattern for all data transmitted This bit pattern is called a chip or chipping code Even if one or more bits in the chip are damaged during transmission statistical techniques embedded in the receiver 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 However to an intended receiver i e another wireless LAN end point the DSSS signal is recognized as the only valid signal and interference is inherently rejected ignored Encryption A security method that applies a specific algorithm to data in order to alter the data s appearance and prevent other devices from reading the information Ethernet IEEE standard network protocol that specifies how data is placed on and retrieved from a common transmission medium Has a transfer rate of 10 Mbps Forms the underlying transport vehicle used by several upper level protocols including TCP IP and XNS FHSS Frequency Hopping Spread Spectrum F
7. click Advanced Figure 4 4 Note Steps 2 and 3 are the instructions and screenshots for Windows XP with Service Pack 1 installed If you have not installed Service Pack 1 select the network you want and click the Connect button If the network has WEP encryption enabled enter the WEP key in the Network key field and then click the Connect button 3 The screen in Figure 4 5 will appear Enter the WEP key of your wireless network in the Network key field and re enter it in the Confirm network key field Then click the Connect button Note Wireless Zero Configuration does not support the use of a passphrase Enter the exact WEP key used by your access point Wireless Network Connection 3 The following wireless network s are available To access a wireless network select it from the list and then click Connect Available wireless networks i Linksys This wireless network requires the use of a network key WEP To access this network type the key then click Connect Network key ET E p Confirm network key Enable IEEE 802 1 authentication for this network If you are having difficulty connecting to a network click Advanced Figure 4 5 4 The screen in Figure 4 6 will appear if your connection is i Wireless Network Connection 3 active Connected to linksys Signal Strength Excellent Figure 4 6 For more information about WEP refer to your access point s
8. communications systems It is designed to trade off bandwidth efficiency for reliability integrity and security In other words more bandwidth is con sumed than in the case of narrowband transmission but the trade off produces a signal that is in effect louder and thus easier to detect provided that the receiver 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 SSID Service Set IDentifier A unique name shared among all points in a wireless network The SSID must be identical for each point in the wireless net work and is case sensitive Storage The semi permanent or permanent holding place for digital data 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 IP address to turn part of the host ID address field into a field for subnets Switch 1 A data switch connects computing devices to host computers allowing a large number of devices to share a limited number of ports 2 A device for making breaking or changing the connections in an electrical cir cuit TCP Transmission Control Protocol A method protocol used along with the IP Internet Protocol to send data in the form of me
9. or 128 bit shared key algorithm as described in the IEEE 802 11 standard 29 30 Appendix B Glossary 802 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 standard specifies a maximum data transfer rate of 11Mbps an operating frequency of 2 4GHz and WEP encryption for security 802 11b networks are also referred to as Wi Fi networks 802 11 g A wireless networking standard that specifies a maximum data trans fer rate of 54Mbps using OFDM modulation an operating frequency of 2 4GHz backward compatibility with IEEE 802 11b devices and WEP encryption for security Adapter Printed circuit board that plugs into a PC to add to capabilities or connectivity to a PC In a networked environment a network interface card is the typical adapter that allows the PC or server to connect to the intranet and or Internet Ad hoc Network An ad hoc network is a group of computers each with a wireless adapter connected as an independent 802 11 wireless LAN Ad hoc wireless computers operate on a peer to peer basis communicating directly with each other without the use of an access point Ad hoc mode is also referred to as an Independent Basic Service Set IBSS or as peer to peer mode and is useful at a departmental scale or SOHO operation Backbone The part of a network that conne
10. HSS continuously changes hops the carrier frequency of a conventional carrier several times per second according to a pseudo random set of channels Because a fixed frequency is not used and only the transmitter and receiver know the hop patterns interception of FHSS is extremely difficult Fragmentation Breaking a packet into smaller units when transmitting over a network medium that cannot support the original size of the packet Gateway A device that interconnects networks with different incompatible communications protocols Hardware Hardware is the physical aspect of computers telecommunica tions and other information technology devices The term arose as a way to dis tinguish the box and the electronic circuitry and components of a computer from the program you put in it to make it do things The program came to be known as the software Hop The link between two network nodes IEEE The Institute of Electrical and Electronics Engineers The IEEE describes itself as the world s largest technical professional society promoting the development and application of electrotechnology and allied sciences for 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 and international standards The organization publishes a number of journals has many local chapters and several large societies in special areas s
11. IP Address of the Adapter Subnet Mask The Subnet Mask of the Adapter Default Gateway The Default Gateway address of the Adapter DNS The DNS address of the Adapter DHCP The status of the DHCP client 16 Wireless Network Status State The status of the wireless network connection SSID The unique name of the wireless network Network Type The mode of the wireless network currently in use Transfer Rate The data transfer rate of the current connection Channel The channel to which the wireless network devices are set WEP The status of the WEP encryption security feature MAC The MAC address of the wireless network s access point Signal Strength The Signal Strength bar indicates signal strength Link Quality The Link Quality bar indicates the quality of the wireless net work connection Click the Back button to return to the initial Link Information screen Click the X Close button in the upper right corner to exit the WLAN Monitor The Site Survey screen Figure OE a 7 4 displ LINKSYS 7 3 1Sp om a A Division of Cisco Spputemna les Wireless G PCI Adapter list of infra WLAN Monitor vec 12 structure and ad hoc networks Bodo is the list of last found wireless connections available to your Wireless G PCI available for Adapter To refresh the list click Ihe Fhofraah button To connect to one of the connection on the list select the desired connection then click Connect button to conn
12. OR FOR SPECIAL INDIRECT CONSE QUENTIAL INCIDENTAL OR PUNITIVE DAMAGES HOWEVER CAUSED REGARDLESS OF THE THEORY OF LIABILITY ARISING OUT OF OR RELATED TO THE USE OF OR INABILITY TO USE THE PRODUCT EVEN IF LINKSYS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT WILL LINKSYS LIABILITY EXCEED THE AMOUNT PAID BY YOU FOR THE PRODUCT The foregoing limitations will apply even if any warranty or remedy provided under this Section fails of its essential purpose Some jurisdictions do not allow the exclusion or lim itation of incidental or consequential damages so the above limitation or exclusion may not apply to You This Warranty is valid and may be processed only in the country of pur chase Please direct all inquiries to Linksys P O Box 18558 Irvine CA 92623 For help with the installation or operation of this product contact Linksys Technical Support at one of the phone numbers listed on the Technical Support insert or one of the Internet addresses below E mail Europe europe support linksys com United Kingdom amp Ireland uks linksys com Latin America latam soporte linksys com U S and Canada support linksys com For unlisted regions or the most up to date contact information please visit the website below Web http www linksys com international 41 LINKSYS http www linksys com Copyright 2003 Linksys All Rights Reserved
13. PC s chassis with a mounting screw Then close your PC 4 Attach the external antenna to the adapter s antenna port 5 Power on your desktop PC You have now completed the hardware installation for the Adapter To install the driver for the Adapter proceed to the next section Driver Installation for Windows XP Driver Installation for Windows XP 2 When yas Found New Hardware Wizard 1n1sne has 1 Windows XP will automatically detect the Adapter Insert the Setup CD installing the lk aen ae gui lies ROM into the CD ROM drive and the screen in Figure 4 1 should appear driver click the Te Click the radio button next to Install the software automatically Finish button He Wireless G PCI Adapter Recommended Then click the Next button Found New Hardware Wizard Welcome to the Found New Hardware Wizard Click Finish to close the wizard This wizard helps you install software for Witeless G PCI Adapter Figure 4 2 If your hardware came with an installation CD lt lt or floppy disk insert it now You have now completed the driver installation for the Adapter To configure the Adapter proceed to the next section What do you want the wizard to do Windows XP Wireless Zero Configuration Install the software automatically Recommended O Install from a list or specific location Advanced z Windows XP Wireless Zero Configuration Chek Next to continue For Windows XP users Window
14. Questions 26 Appendix A Troubleshooting This chapter provides solutions to problems that may occur during the installa tion and operation of the Wireless G PCI Adapter Read the descriptions below to solve your problems If you can t find an answer here check the Linksys website at www linksys com 1 The Wireless G PCI Adapter does not work properly e Reinsert the Wireless G PCI Adapter into your PC s PCI slot e Right click on My Computer and select Properties Select the device manager and click on the Network Adapter You will find the Wireless G PCI Adapter if it is installed successfully If you see the yellow exclama tion mark the resources are conflicting You will see the status of the Wireless G PCI Adapter If there is a yellow question mark please check the following e Make sure that your PC has a free IRQ Interrupt ReQuest a hardware interrupt on a PC e Make sure that you have inserted the right adapter and installed the prop er driver If the Wireless G PCI Adapter does not function after attempting the above steps remove the adapter and do the following e Uninstall the driver software from your PC e Restart your PC and repeat the hardware and software installation as specified in this User Guide 2 cannot communicate with the other computers linked via Ethernet in the Infrastructure configuration e Make sure that the PC to which the Wireless G PCI Adapter is associated is powered on e Make s
15. Uniform Resource Locator you requested or in the e mail address you re sending a note to At the other end the recipient can see the IP address of the Web page requestor or the e mail sender and can respond by sending another message using the IP address it received IRQ Interrupt ReQuest A hardware interrupt on a PC There are 16 IRQ lines used to signal the CPU that a peripheral event has started or terminated Except for PCI devices two devices cannot use the same line 33 34 ISM band The FCC and their counterparts outside of the U S have set aside bandwidth for unlicensed use in the ISM Industrial Scientific and Medical band Spectrum in the vicinity of 2 4 GHz in particular is being made avail able worldwide This presents a truly revolutionary opportunity to place con venient high speed wireless capabilities in the hands of users around the globe LAN Local Area Network A group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area for example within an office building MAC Media Access Control Address A unique number assigned by the manufacturer to any Ethernet networking device such as a network adapter that allows the network to identify it at the hardware level Mbps Megabits per second One million bits per second unit of measure ment for data transmission Motherboard A moth
16. Wireless G PCI Adapter Use this Guide to install WMP54G COPYRIGHT amp TRADEMARKS Specifications are subject to change without notice Copyright 2003 Linksys All Rights Reserved Linksys and the Linksys logo are registered trademarks of Linksys Group Inc Microsoft Windows and the Windows logo are registered trademarks of Microsoft Corporation All other trademarks and brand names are the property of their respective proprietors SAFETY AND REGULATORY NOTICES FCC STATEMENT The Wireless G PCI Adapter has been tested and complies with the specifications for a Class B digital device pursuant to 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 These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio fre quency energy and If not installed and used according to the instructions may cause harmful interference to radio communications However there is no guarantee that inter ference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which is found by turning the equipment off and on the user is encouraged to try to correct the interfer
17. ar a Doane E entwcrh The SSID run be mental fer gach point in he Wea riia aad aA rnai Figure 7 10 21 eZ 4 The Wireless Settings screen Figure 7 11 will appear If you chose Infrastructure Mode go to Step 5 now If you chose Ad Hoc Mode select the correct operating channel for your network from the Channel drop down menu Then select the Network Mode from the drop down menu Click the Next button and go to Step 5 Click the Back button to change any settings Channel The channel you choose should match the channel set on the other devices in your wireless network If you are unsure about which chan nel to use select the default channel Channel 11 Network Mode Select Mixed Mode and both Wireless G and Wireless B computers will be allowed on the network but the speed will be reduced Select G Only Mode for maximum speed but no Wireless B users will be allowed on the network 5 E s L INKSYS aT i cocoa Wireless G PCI Adapter WLAN Monitor vec 12 Wireless Settings Select a channel for your Ad Hoc wireless nebros Channels 1 6 and 11 are preted and al wreless denses mul vec the same channel Please select the channel for your wrtigss notwork Setec a nelvecrk ayalabelty mode bn Mired Mode both Viirelass 4 and Wireless G equepped compuiars can jan iha Ad Hoc network Note fal when Viretess H nodes are mchvery communicating the banciidth aralable is Winokess3 members a roduodd Ii of the Wireless
18. 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 that changes frequency in a pattern that is known to both transmitter and receiver Properly synchronized the net effect 1s 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 trans mission 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 nar rowband receivers 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 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 bit
19. by Intel and first appeared on PCs in late 1993 PCI provides a high speed data path between the CPU and peripheral devices video disk network etc There are typically three or four PCI slots on the motherboard In a Pentium PC there is generally a mix of PCI and ISA slots or PCI and EISA slots Early on the PCI bus was known as a local bus PCI provides plug and play capability automatically configuring the PCI cards at startup When PCI is used with the ISA bus the only thing that is gen erally required is to indicate in the CMOS memory which IRQs are already in use by ISA cards PCI takes care of the rest PCI allows IRQs to be shared which helps to solve the problem of limited IRQs available on a PC For example if there were only one IRQ left over after ISA devices were given their required IRQs all PCI devices could share it In a PCI only machine there cannot be insufficient IRQs as all can be shared Plug and Play The ability of a computer system to configure expansion boards and other devices automatically without requiring the user to turn off the system during installation Port A pathway into and out of the computer or a network device such as a switch or router For example the serial and parallel ports on a personal com puter are external sockets for plugging in communications lines modems and printers Roaming In an infrastructure mode wireless network this refers to the abili ty to move out of one
20. compt s ant agi to G Onby Mode no Wiiroless 6 compubers will be able do join Figure 7 11 5 The Network Setting screen Figure 7 12 will appear If your network has a DHCP server click the radio button next to Obtain an IP address automatically DHCP Click the Next button to continue or click the Back button to return to the previous screen If your network does not have a DHCP server click the radio button next to Specify the IP address Enter an IP Address Subnet Mask Default Gateway and DNS appropriate for your network Enter each address in this format XXX XXX XxXx xxx the x s represent the numbers that make up each address You must specify the IP Address and Subnet Mask on this screen If you are unsure about the Default Gateway and DNS addresses then leave these fields alone IP Address This IP Address must be unique to your network Subnet Mask The Adapter s Subnet Mask must be the same as your wired network 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 Click the Next button to continue or the Back button to return to the previ ous screen SE LInKSyYS Sec ee le Wireless G PCI Adapter WLAN Monitor ver 12 Network Setting Obtain an IP address automatically DHCP Setecl In option d you would like P sings io be magmei Automatically Specify IP Settings IP Address Address
21. cts most of the systems and net works together and handles the most data Bandwidth The transmission capacity of a given facility in terms of how much data the facility can transmit in a fixed amount of time expressed in bits per second bps Bit A binary digit The value 0 or l used in the binary numbering system Also the smallest form of data BSS Basic Service Set An infrastructure network connecting wireless devices to a wired network using a single access point CSMA CA Carrier Sense Multiple Access Collision Avoidance In local area networking this is the CSMA technique that combines slotted time divi sion multiplexing with carrier sense multiple access collision detection CSMA CD to avoid having collisions occur a second time This works best if the time allocated is short compared to packet length and if the number of sit uations is small CTS Clear To Send An RS 232 signal sent from the receiving station to the transmitting station that indicates it is ready to accept data Default Gateway The routing device used to forward all traffic that is not addressed to a station within the local subnet DHCP Dynamic Host Configuration Protocol A protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol IP addresses in an organization s network Using the Internet s set of protocol TCP IP each machine that can connect to the Internet needs a unique IP a
22. d Hoc versus Infrastructure Mode Unlike wired networks wireless networks have two different modes in which they may be set up infrastructure and ad hoc In an infrastructure configu ration a WLAN and wired LAN communicate to each other through an access point In ad hoc configuration wireless equipped computers communicate directly with each other Choosing between these two modes depends on whether or not the wireless network needs to share data or peripherals with a wired network or not If the computers on the wireless network need to be accessed by a wired network or need to share a peripheral such as a print er with the wired network computers the wireless network should be set up in infrastructure mode See Figure 2 1 The basis of infrastructure mode centers around an access point which serves as the main point of communications between a wired and wireless network Access points transmit data to PCs equipped with wireless network adapters which can roam within a certain radial range of the access point Multiple access points can be arranged to work in succession to extend the roaming range and can be set up to communicate with your Ethernet wired hardware as well Figure 2 1 If the wireless network is relatively small and needs to share resources only with the other computers on the wireless network then the ad hoc mode can be used See Figure 2 2 Ad hoc mode allows computers equipped with wire less transm
23. ddress 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 IP address must be entered DHCP lets a network administrator supervise and dis tribute IP addresses from a central point and automatically sends a new IP address 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 address will be valid for a computer The lease time can vary depending on how long a user 1s 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 networks in which there are more computers than there are available IP addresses DHCP supports static addresses for computers containing Web servers that need a permanent IP address DNS The domain name system DNS is the way that Internet domain name are located and translated into Internet Protocol IP addresses A domain name is a meaningful and easy to remember handle for an Internet address Domain A subnetwork comprised of a group of clients and servers under the control of one security database Dividing LANs into domains improves per formance
24. ding the License Agreement shown in Figure 5 2 click the Next button to continue the installation or click the Cancel button to end the installation LINKSYS A Division of Cisco Systems Inc Setup Wizard ver 1 2 License Agreement END USER LICENSE AGREEME For Linksys Instant Wireless Wireless G PCI Adapter IMPORTANT READ CAREFULLY This Linksys End User License Agreement EULA is a legal agreement between you ether an individual or a single enhy and and Linksys Comeoration For the Linksys product identified above which includes computer software and E you accepi the terms of fhis Agreement click Next to continue I nol choose Cancel and the Setup Wizard wil cios To instal the Wireless G PCI Adapters Soltware you Mud accept les agreement Figure 5 2 The Setup Wizard will display a screen similar to that shown in Figure 5 3 asking you to choose a wireless mode Click the Infrastructure Mode radio button if you want your wireless computers to network with comput ers on your wired network using a wireless access point Click the Ad Hoc Mode radio button if you want multiple wireless computers to network directly with each other Do not use Ad Hoc mode if you want your wire less computers to communicate with computers on your wired network 11 12 In the SSID field enter the SSID of your wireless network The SSID must be identical for all devices in the network The default setting is linksys all lowercase Cl
25. documentation or visit www linksys com For more information about wireless networking on a Windows XP computer enter the keyword wireless in the Windows XP search engine Congratulations Your PC is now connected to your wireless network Chapter 9 Software Installation and Configuration for Windows 985E Me and 2000 10 The Wireless G PCI Adapter s Setup Wizard will guide you through the instal lation procedure for Windows 98SE Me and 2000 The Setup Wizard will install the WLAN Monitor and driver as well as configure the Adapter Insert the Setup Wizard CD ROM into your CD ROM drive The Setup Wizard should run automatically and Figure 5 1 should appear If it does not click the Start button and choose Run In the field that appears enter D setup exe if D is the letter of your CD ROM drive LINKSYS A Onision of Cisco Systems Inc Setup Wizard ver 1 2 Welcome Welcome to the Setup Wizard for the Wireless G PCI Adapter To funchon property thes instalation should be run before physically installing the Adapter O Setup To continue press the Setup bution User Guide Copyright 2003 Cisco Systems Inc All rights reserved Figure 5 1 Setup Wizard Instructions for Windows 98SE Me and 2000 l To install the Adapter click the Install button on the Welcome screen Figure 5 1 Click User Guide to view the User Guide or click Exit to exit the Setup Wizard After rea
26. 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 whether it should seek a new one When a node no longer receives acknowledgment from its original access point it undertakes a new search Upon finding a new access 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 bandwidth for unlicensed use in the ISM Industrial Scientific and Medical band Spectrum in the vicinity of 2 4 GHz in particular is being made available worldwide This presents a truly revolutionary opportunity to place convenient high 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 the case of narrowband transmission but the trade off produces a signal that is in effect louder and thus easier to detect provided that the receiver 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
27. ect connection Sito lafermation Network Type AdHoc Channel 6 WEP Disabled MAC 1E SE EB 49 F7 03 Surveyed at 4 17 03 PM es WMPSAG is Active Figure 7 4 SSID The SSID or unique name of the wireless network Signal The percentage of signal strength 17 18 Site Information Network Type The mode of the wireless network currently in use Channel The channel to which the wireless network devices are set WEP The status of the WEP encryption security feature MAC The MAC address of the wireless network s access point Surveyed at The time at which the wireless network was scanned Refresh Click the Refresh button to perform a new search for wireless devices 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 7 5 In the WEP drop down box select the type of WEP encryption used by the wireless net work 64 bit or 128 bit WEP Linksys Grins ef Gisco pete less Wireless G PCI Adapter WLAN Monitor vee 12 Security Settings Enter your network s security information in the fields below 0 FES Passphrase Tho Passphrase is coso sonsitive and should be fower than 16 characters You may manually enter your WEP key in hexadecimal format below Figure 7 5 If the wireless network uses a passphrase enter the passp
28. ence by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment or devices e Connect the equipment to an outlet other than the receiver s e Consult a dealer or an experienced radio TV technician for assistance FCC Caution Any change or modification to the product not expressly approved by Linksys could void the user s authority to operate the device EC DECLARATION OF CONFORMITY EUROPE Linksys declares that the Wireless G PCI Adapter conforms to the specifications listed below following the provisions of the European R amp TTE directive 1999 5 EC e EN 301 489 1 301 489 17 General EMC requirements for Radio equipment e EN 609 50 Safety e ETS 300 328 2 Technical requirements for Radio equipment Caution This equipment is intended to be used in all EU and EFTA countries Outdoor use may be restricted to certain frequencies and or may require a license for operation Contact local Authority for procedure to follow Note Combinations of power levels and antennas resulting in a radiated power level of above 100 mW equivalent isotropic radiated power EIRP are considered as not com pliant with the above mentioned directive and are not allowed for use within the European community and countries that have adopted the European R amp TTE directive 1999 5 EC For more details on legal combinations of power levels and antennas contact Linksys Corporate Compliance
29. erboard is the physical arrangement in a computer that contains the computer s basic circuitry and components Network A system that transmits any combination of voice video and or data between users Node A network junction or connection point typically a computer or work station OFDM Developed for wireless applications Orthogonal Frequency Division Multiplexing OFDM technology offers superior performance increased data rates and more reliable transmissions than previous technologies such as DSSS OFDM is a scheme in which numerous signals of different frequencies are combined to form a single signal for transmission on the medium OFDM works by breaking one high speed data stream into a number of lower speed data streams which are then transmitted in parallel Each lower speed stream is used to modulate a subcarrier Essentially this creates a multi carrier transmission by dividing a wide frequency band or channel into a number of narrower frequency bands or sub channels OFDM 1s also used for other appli cations including powerline networking Packet A unit of data routed between an origin and a destination in a network Passphrase Used much like a password a passphrase simplifies the WEP encryption process by automatically generating the WEP encryption keys for Linksys products PCI Peripheral Component Interconnect A peripheral bus commonly used in PCs Macintoshes and workstations It was designed primarily
30. etwork devices are set WEP The status of the WEP encryption security feature Connect To connect to a wireless network using a specific profile select the profile 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 19 Import Click Wireless G Notebook Adapter WLAN Monitor ee Py i j Look in amp My Documents le Ac Er profile that has My Pictures been saved in another location From the screen that appears shown in Figure 7 7 select the appropriate file and click the Open button 2 x Files of type Linksys Wireless Profile cfg Figure 7 7 Export To save the profile s in ajx a different location click the Fes npt Folle to port bu Export button On the screen that appears Figure 7 8 direct Windows to the appropriate fold er and click the OK button JocUMeNts a My Computer H Local Disk C ui WPC54G RC1113 D E My Network Places Figure 7 8 Delete Click the Delete button to delete a profile Click the X Close button in the upper right corner to exit the WLAN Monitor Note If you have more than one profile all profiles will be auto matically selected and exported to the same folder 2 When the Create connection Creating a New Profile 1 On
31. he current wireless connection To search for available wireless networks click the Site Survey tab To perform configura tion changes click the Profiles tab LINKSYS ee ee Wireless G PCI Adapter WLAN Monitor vee 12 Link Information Wa The current links between your Wireless Network Adapter AP Houler and Internet Figure 7 2 15 Link Information The Link Information screen displays signal strength and link quality informa tion about the current connection and provides a button to click for additional status information Ad Hoc Mode or Infrastructure Mode The screen indicates whether the Adapter is currently working in ad hoc or infrastructure mode Signal Strength The Signal Strength bar indicates signal strength Link Quality The Link Quality bar indicates the quality of the wireless net work connection Click the X Close button in the upper right corner to exit the WLAN Monitor Click the More Information LINKSYS button to view A Cela of Cesco Syrien bee Wireless G PCI Adapter more informa WLAN Monitor vee 12 tion about the wireless net work connec Bere es the informaien abdul thee current link between the iWineesa G POI Adapter and fs tion screen wiroless network connection similar to that taz wa festa Conn ot d shown in Figure z eu Semen Inlas utue 7 3 will appear Cu 2437 GHA HAC 1E 8E EB 45 F 7 03 Figure 7 3 TCP IP Setting IP Address The
32. hrase in the Passphrase field If the wireless network uses a WEP key enter the WEP key in the Key 1 field Click the OK button to complete the network connection and return to the Site Survey screen or click the Cancel button to cancel the network connection and return to the Site Survey screen On the Site Survey screen click the X Close button in the upper right corner to exit the WLAN Monitor The Profiles screen Figure 7 6 lets you save different configuration profiles for different network setups You can also import or export profiles The default profile holds the initial configuration saved when you ran the Setup Wizard es Wireless G PCI Adapter WLAN Monitor ver 12 LINKSYS A Divisio af Ciscoe Systema bee Click the Prodihe name above and the Connect bution bestow fo use preeoonh qured Wireless network settings Use the menu below to manage your wireless network s Profile Information Network Type Infrastructure Transfer Rate Auto Channel Auto WEP Disabled Figure 7 6 Profile Name of the connection profile SSID The wireless network s unique name as set in the connection profile Profile Information Network Type The mode of the wireless network currently in use Transfer Rate The data transfer rate of the current connection In Auto mode the Adapter dynamically shifts to the fastest data transfer rate possible at any given time Channel The channel to which the wireless n
33. ick the Next button or click the Back button to return to the previous page LINKSYS Setup Wizard ve 1 2 Wireless Mode Infrastiucture Mode in infastructiore moc De Wineheis Gaines COTE ih each ode andl bo a waned Peeve Wd Ai BOOS pinl C Ad Hoc Mode An ad hoc network is a group of computers nach wath a wingit adaphor connected as an independent BL Tl ire LAN Ad hoc wireless comouien operate on a Peer to peer bugis commerecating directly with each other without the use of an access pont Please enter the SSID for your wireless network a Figure 5 3 4 If you chose Infrastructure Mode go to Step 5 now If you chose Ad Hoc Mode you ll see a screen similar to that shown in Figure 5 4 Select the correct operating channel for your network from the Channel drop down menu Then select the Network Mode from the drop down menu Click the Next button and go to Step 5 Click the Back button to change any settings Channel The R channel you LINKSYS choose should A Division of Cisco Systems inc match the chan Setup Wizard ver 12 nel set on the Ad Hoc Mode Settings other devices in Selec the Chass you plan to use for your wares meteor You may choose any your wireless chanel as iong as a fe computers ara on be same channel Cick Ment io network If you CE a are unsure about Select a meteors ovadablity mode in Mad Mode beth Vrekss 5 and Wireles which channel ae rad a ch conmuncaing D bash te to use select the l
34. itters and receivers to communicate directly with each other elimi nating the need for an access point The drawback of this mode is that in Ad Hoc mode wireless equipped computers are not able to communicate with computers on a wired network And of course communication between the wireless equipped computers 1s limited by the distance and interference direct ly between them Figure 2 2 Chapter 3 Getting to Know the Wireless G PCI Adapter The PCI Adapter will install into your PC like any PCI adapter and on the mounting bracket you will find two distinguishing items ACT LED Green The ACT LED lights up when the Adapter is powered on Antenna Port Attach the PCI Adapter s antenna here and position it for maximum performance which is usually perpendicular to the horizon Chapter 4 Hardware and Driver Installation and Configuration for Windows KP After installing the Adapter into your PC you will install the driver and con figure the Adapter Hardware Installation for Windows XP 1 Turn off your desktop PC 2 Open your PC case and locate an available PCI slot on the motherboard Check with your computer manufacturer for instructions 3 Slide the PCI Adapter into the PCI slot Make sure that all of its pins are touching the slot s contacts You may have to apply a bit of pressure to slide the adapter all the way in After the adapter is firmly in place secure its fas tening tab to your
35. ose ro Must conde wi D Be D Rn De nian 9 J a default channel BEDT Mixed mode Channel 6 Figure 5 4 Network Mode Select Mixed Mode and both Wireless G and Wireless B computers will be allowed on the network but the speed will be reduced Select G Only Mode for maximum speed but no Wireless B users will be allowed on the network The Setup Wizard will ask you to review your settings as in Figure 5 5 before it starts to copy files Click the Next button to save these settings or click the Back button to change any set tings After the files have been suc cessfully copied the screen in Figure 5 6 will appear Click the Exit button LINKSYS Setup Wizard vec 1 2 Finalize Settings Review ihe setings below belare completing the installation for the WLAN Monitor Gack Back io change any matings of Met l complets your installation Wireless Mode ntractructure SSID linksys Channel Arte il Figure 5 5 INKSYS ul Ci Systems lin Setup Wizard vor 1 2 Congratulations The installation of the Wireless G PCI Adapter is complete Figure 5 6 Proceed to Chapter 6 Hardware Installation for Windows 98SE Me and 2000 13 14 Chapter 6 Hardware Installation for Windows 985E Me and 2000 Make sure that you do Chapter 5 and install the software with the Setup Wizard before you install the hardware 1 Turn off your desktop PC 2 Open your PC case
36. rrus of Cinco Speen lex Security Settings Enter your network s security information in the fields below Passphrase ssphrrse Tho Passphrase is coso sonsitive and should be fower than 16 characters You may manually enter your WEP key in hexadecimal format below Figure 7 13 The Confirm R New Settings _ aeaea screen Figure 7 14 will appear To save the new settings click the Yes button To can cel the settings and return to the Profiles screen click the No button To edit the new settings click the Back button LINKSYS A Cerin of Cinco Spot int Wireless G PCI Adapter WLAN Monitor vee 12 Figure 7 14 The Congratulations screen Figure 7 15 will appear next Click Activate new settings now to implement the new settings immediately and return to the Link Information screen Click Activate new settings later to keep the current settings active and return to the Profiles screen so that you can edit your profile or create another profile R gp Wireless G PCI Adapter WLAN Monitor vee 12 LINKSYS Carini cf Cisco Septem Inc Congratulations 2 A GHz Your Wireless G PCI Adapter has successfully been configured Achivenbe Fur Behings mow Aecbvete mew Settings lain Figure 7 15 You have successfully created a connection profile Click the X Close but ton in the upper right corner to exit the WLAN Monitor 20 Common Problems and Solutions Frequently Asked
37. s XP has a built in configuration tool Use Windows XP Wireless Zero Configuration in the system tray at res Figure 4 1 the bottom of your screen to configure the Adapter 1 After installing the Adapter the Windows XP Wireless Zero Configuration icon will appear in your computer s system tray see Figure 4 3 Double click the icon i Wireless Network Connection 3 One or more wireless networks are available To see a list of available networks click here Figure 4 3 2 The screen that appears will show any available wireless network Select the network you want If you have already enabled WEP encryption on your network skip ahead to step 3 If you have NOT APRS ec aed ie enabled WEP encryp ernie a ae e folowing wireless network s are ava To access a tion on your network wireless network select it from the list and then click Connect the screen in Figure 4 4 will appear Check the box next to Allow me to connect to the selected wireless network even though it is not secure Then click the Connect Available wireless networks A This wireless network is not secure Because a network key WEP is not used for authentication or for data encryption data sent over this network might be subject to unauthorized access button and continue to step 4 V Allow me to connect to the selected wireless network even though it is not secure If you are having difficulty connecting to a network
38. ssage units datagram between network devices over a LAN or WAN While IP takes care of handling the actual delivery of the data routing TCP takes care of keeping track of the individual 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 of receipt 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 of protocols and not only TCP and IP Throughput The amount of data moved successfully from one place to another in a given time period Topology A network s topology is a logical characterization of how the devices on the network are connected and the distances between them The most common network devices include hubs switches routers and gateways Most large networks contain several levels of interconnection the most impor tant of which include edge connections backbone connections and wide area connections WAN Wide Area Network A communications network that covers a rela tively large geographic area consisting of two or more LANs Broadband com munication over the WAN is often through public networks such as the tele phone
39. syss entire liability under this warranty will be for Linksys at its option to repair or replace the product or refund Your purchase price less any rebates If the product proves defective during the Warranty Period call Linksys Technical Support in order to obtain a Return Authorization Number BE SURE TO HAVE YOUR PROOF OF PURCHASE ON HAND WHEN CALLING When returning a product mark the Return Authorization Number clearly on the outside of the package and include a copy of your original proof of purchase RETURN REQUESTS CANNOT BE PROCESSED WITHOUT PROOF OF PURCHASE You are responsible for shipping defective products to Linksys Linksys pays for UPS Ground shipping from Linksys back to You only Customers locat ed outside of the United States of America and Canada are responsible for all shipping and handling charges ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO THE DURATION OF THE WARRANTY PERIOD ALL OTHER EXPRESS OR IMPLIED CONDITIONS REPRESENTATIONS AND WARRANTIES INCLUDING ANY IMPLIED WARRANTY OF NON INFRINGEMENT ARE DISCLAIMED Some jurisdictions do not allow limitations on how long an implied war ranty lasts so the above limitation may not apply to You This warranty gives You specif ic legal rights and You may also have other rights which vary by jurisdiction TO THE EXTENT NOT PROHIBITED BY LAW IN NO EVENT WILL LINKSYS BE LIABLE FOR ANY LOST DATA REVENUE OR PROFIT
40. the Profiles screen shown in Figure 7 6 click the New button to create a new profile Create connection profile profile screen appears Figure Enter a name for the new profile 7 9 enter a name for the new profile Click OK to save the profile name or click Cancel to return to the previous screen Figure 7 9 3 The Choose a network type screen Figure 7 10 shows a choice of two wireless modes Click the Infrastructure Mode radio button if you want your wireless computers to communicate with computers on your wired network via a wireless access point Click the Ad Hoc Mode radio button if you want multiple wireless computers to communicate directly with each other Click the Next button to continue or the Back button to return to the previous screen Infrastructure Mode This mode allows wireless and wired networks to communicate 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 R LINKSYS A Covi of Cinco Sepeteemn int Wireless G PCI Adapter WLAN Monitor vee 12 Choose a network type tf Infrastructure Mode nocturne mode Tee wanted Gentes commune val Gach other and Lo wingi nihrork wil in Sots pimi 0 AdHoc Mode In Adho mode Be winekas Grice commurmciia direct with each oher wiog he ase of an BODES por Please enter the SSID for your wireless network SSID Sora Sat WISE A gaat erat shang am
41. ttp www art telecom fr for procedure to follow WMP54G_V2 eu UG 30815B KL Table of Contents Chapter 1 Introduction The Wireless G PCI Adapter Features Chapter 2 Planning Your Wireless Network Network Topology Ad Hoc versus Infrastructure Mode Chapter 3 Getting to Know the Wireless G PCI Adapter Chapter 4 Hardware and Driver Installation and Configuration for Windows XP Overview Hardware Installation for Windows XP Driver Installation for Windows XP Windows XP Wireless Zero Configuration Chapter 5 Software Installation and Configuration for Windows 98SE Me and 2000 Overview Setup Wizard Instructions for Windows 98SE Me and 2000 Chapter 6 Hardware Installation for Windows 98SE Me and 2000 Chapter 7 Using the WLAN Monitor for Windows 98SE Me and 2000 Overview Accessing the WLAN Monitor Link Information Site Survey Profiles Creating a New Profile NYO nw A 10 10 11 14 15 15 15 16 17 19 21 Chanter 1 Introduction Appendix A Troubleshooting 26 The Linksys Wireless G PCI Adapter installs in most desktops and lets you put Common Problems and Solutions 26 your computer almost anywhere in the building without the cost and hassle of Frequently Asked Questions 26 running network cables Now you don t have to drill holes in your walls and climb through the attic or cellar to get connected to the network Once you re Appendix B Glossary 30 connected you can keep in touch with yo
42. uch as the IEEE Computer Society Infrastructure Network An infrastructure network is a group of computers or other devices each with a wireless adapter connected as an 802 11 wireless LAN In infrastructure mode the wireless devices communicate with each other 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 a Basic Service Set BSS A set of two or more BSS in a single network is referred to as an Extended Service Set ESS Infrastructure mode is useful at a corporation scale or when it is necessary to connect the wired and wireless networks IP Internet Protocol The method or protocol by which data is sent from one computer to another on the Internet It is a standard set of rules procedures or conventions relating to the format and timing of data transmission between two computers that they must accept and use to be able to understand each other 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 or receiver of information that is sent in packet across the Internet When you request an HTML page or send e mail the Internet Protocol part of TCP IP includes your IP address in the message actually in each of the packets 1f more than one is required and sends it to the IP address that is obtained by looking up the domain name in the
43. ur e mail access the Internet use instant messaging to chat with friends and share files and other resources such Appendix C Specifications 38 as printers and network storage with other computers on the network Environmental 39 The Wireless G PCI Adapter connects you with Wireless G networks at an Appendix D Warranty Information 40 incredible 54Mbps And for added versatility it can also interoperate with all the 11Mbps Wireless B 802 11b products found in homes businesses and Appendix E Contact Information 41 public wireless hotspots around the country And in either mode your wireless communications are protected by up to 128 bit encryption so your data stays secure So don t hassle with running cables through your house get your desktop con nected the easy way with the Linksys Wireless G PCI Adapter e Operates in the 2 4Ghz frequency spectrum with throughput of up to 54 Mbps e Complies with IEEE 802 11g standards and backwards compatible with IEEE 802 11b products e Up to 128 bit WEP encryption e 32 bit PCI Interface e Compatible with Windows 98SE Millennium 2000 and XP Chapter 2 Planning Your Wireless Network A wireless local area network WLAN is exactly like a regular local area net work LAN except that each computer in the WLAN uses a wireless device to connect to the network Computers in a WLAN share the same frequency channel and SSID which is an identification name for wireless devices A
44. ure that your Wireless G PCI Adapter is configured on the same channel and with the same security options as with the other computers in the Infrastructure configuration Can 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 over a network Consult the application s user guide to determine if 1t supports oper ation over a network Can 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 What is the IEEE 802 11b standard It is one of the IEEE standards for wireless networks The 802 11b standard allows wireless networking hardware from different manufacturers to commu nicate provided that the hardware complies with the 802 11b standard The 802 11b standard states a maximum data transfer rate of 11 Mbps and an oper ating frequency of 2 4GHz What IEEE 802 11b features are supported The product supports the following IEEE 802 11b functions e CSMA CA plus Acknowledge protocol e Multi Channel Roaming e Automatic Rate Selection e RTS CTS feature e Fragmentation e 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 hoc wireless network will not communicate
45. with any wired network What is infrastructure mode When a wireless network is set to infrastructure mode the wireless network is configured to communicate with a wired network through a wireless access point 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 make sure that it is the same channel number with the access point of dedicated cov erage area 21 28 To achieve true seamless connectivity the wireless LAN must incorporate a number of different functions Each node and access point for example must always acknowledge receipt of each message Each node must maintain contact with the wireless network even when not actually transmitting data Achieving these functions simultaneously requires a dynamic RF networking technology that 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 1t evaluates such factors as signal strength and quality as well as the message load currently being carried by each access point and the distance of each access point to the wired backbone Based on that information the node next selects the right access point and registers its address Communications between end node and host computer can then be transmitted up and
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