Cisco Linksys WAP54G Wireless-G Access Point User Manual WAP54G user guide

Cisco-Linksys, LLC Wireless-G Access Point WAP54G user guide

Contents

Manual Part 3

Wireless-G Access Point21The Status tab, shown in Figure 6-8, will display current information on theAccess Point, its settings, and its performance.•Firmware Version. The current version of the Access Point’s firmware isdisplayed. Firmware should only be upgraded from the Help tab if youexperience problems with the Access Point.•AP Name. This displays the name you assigned to the Access Point.Figure 6-8The Status TabInstant Wireless® Series20Note: In Wireless Bridge mode, the Access Point can ONLY beaccessed by another access point in Wireless Bridge mode. In orderfor your other wireless devices to access the Access Point, you mustreset it to Access Point mode. The two modes are mutually exclusive. Figure 6-7
Wireless-G Access Point23Instant Wireless® Series22To view a log of the Access Point’s activity, select the Log tab, shown in Figure6-9.Log. To enable permanent logging activity, click the Enable radio buttonbeside Log. The default setting for this function is Disable.If you have chosen to monitor the Access Point’s traffic, then you can designatea PC that will receive permanent log files periodically. In the Send Log to field,enter the IP address of this PC. To view these permanent logs, you must useLogviewer software, which can be downloaded free of charge fromwww.linksys.com.To see a temporary log of the Access Point’s most recent activities, click theView Log button.Click the Apply button to apply your changes or Cancel to cancel yourchanges. If you require online help, click the Help button.The Log TabFigure 6-9LAN •MAC Address. The MAC Address of the LAN interface is displayed here.•Configuration Type. This displays how the Access Point is assigned an IPaddress, either Automatic Configuration - DHCP, if assigned by DHCPserver, or Static IP Address and its IP Address, Subnet Mask, and DefaultGateway address, if assigned by Static IP Address server. •IP Address. This IP address is the unique IP address of the Access Point.•Subnet Mask. The Access Point’s Subnet Mask (also known as an IPMask), matches the Subnet Mask of your Ethernet network.Wireless•MAC Address. The MAC Address of the LAN interface is displayed here.•SSID. The unique name shared among all points in your wireless networkis displayed here.•Mode. The Access Point’s mode is displayed here.•Channel. The wireless channel shared by all wireless devices connected tothis Access Point is displayed here.•Encryption Function. The encryption method you chose in the SetupWizard or changed from the Setup tab of this Web-based Utility is displayedhere.•Send and Receive. The Send and Receive fields display the number of suc-cessful or dropped packets that have been sent or received. Some packetloss is normal in wireless networking.
Wireless-G Access Point25Instant Wireless® Series24To upgrade the Access Point’s firmware:1. Download the firmware upgrade file from the Linksys website.2. Extract the firmware upgrade file.3. Click the Upgrade Firmware button on the Help screen.4. Enter the location of the firmware upgrade file in the File Path field, orclick the Browse button to find the firmware upgrade file.5. Double-click the firmware upgrade file.6. Click the Upgrade button, and follow the on-screen instructions.Click the Cancel button to cancel the firmware upgrade.To access the Filter tab, first click the Advanced tab. The Filter tab, shown inFigure 6-12, allows you to control which computers may or may not commu-nicate with the Access Point—depending on their MACaddresses.To enable filtering of computers by their MAC Addresses, click the Enableradio button. To disable this feature, click the default Disable radio button.Next, determine if the Access Point will Prevent or Permit access to the PCsyou will specify. If you want to block specific PCs from communicating withwith the Access Point, click the radio button next to Prevent PCs listed belowfrom accessing the wireless network. If you want to allow specific PCs fromcommunicating with with the Access Point, click the radio button next toPermit PCs listed below from accessing the wireless network.The Filter TabFor help on the various tabs in this Web-based Utility, along with upgrading theAccess Point’s firmware and viewing this User Guide, click the Help tab,shown in Figure 6-10.The help files for the various tabs in this Web-based Utility are listed by tabname on the lefthand side of the screen.Click the Linksys Website link to connect to the Linksys home page forKnowledgebase help files and information about other Linksys products, pro-vided you have an active Internet connection.For an Online manual in PDF format, click that text link. The User Guide willappear in Adobe pdf format. If you do not have the Adobe PDF Reader installedon your computer, click the Adobe Website link or go to the Setup Wizard CD-ROM to download this software. (To access the Adobe website, you will need anactive Internet connection.) To download from the CD-ROM, click the Start but-ton and select Run. Type D:\Acrobat (if “D” is the letter of your CD-ROM drive).New firmware versions are posted at www.linksys.com and can be downloadedfor free. If the Access Point is not experiencing difficulties, then there is noneed to download a more recent firmware version, unless that version has anew feature that you want to use. Loading new firmware does not alwaysenhance the speed or quality of your Internet connection.The Help TabFigure 6-10Figure 6-11Note: When you upgrade the Access Point’s firmware, you maylose the Access Point’s current configuration settings.
Wireless-G Access Point27Instant Wireless® Series26Before making any changes to the Advanced Wireless tab, shown in Figure 6-13, please check your wireless settings on your other systems, because thesechanges will alter the effectiveness of the Access Point. In most cases, thesewireless settings do not need to be changed.•Authentication Type. The default is set to Auto, where it auto-detects forShared Key or Open System. Shared Key is when both the sender and therecipient share a WEP key for authentication. Open Key is when the senderand the recipient do not share a WEP key for authentication. All points onyour network must use the same authentication type. •Transmission Rates. The default setting is Auto. The range is from 1 to54Mbps. The rate of data transmission should be set depending on the speedof your wireless network. You can select from a range of transmissionspeeds, or you can keep the default setting, Auto, to have the Access Pointautomatically use the fastest possible data rate and enable the Auto-Fallbackfeature. Auto-Fallback will negotiate the best possible connection speedbetween the Access Point and a wireless client. Figure 6-13Above the MAC Address fields, there is a pull-down menu. This pull-downmenu is for selecting the number of computers on your wireless network. Forcomputers one through ten on your wireless network, 1~20 is selected bydefault. If you have more than twenty computers on your wireless network, usethis pull-down menu to select 21~40.Then, type the MAC Address(es) you wish to filter in the MAC Address fields.Do not use colons when entering the digits. Use a xxxxxxxxxxxx format withthe x’s representing the actual characters of the MAC address. If you want toclear the MAC addresses you entered, click the Clear button .When you’ve completed making any changes on this tab, click the Apply but-ton to save those changes or Cancel to cancel your changes. For more infor-mation on this tab, click the Help button.Figure 6-12The Advanced Wireless Tab
Wireless-G Access Point29Instant Wireless® Series28The SNMP screen allows you to customize the Simple Network ManagementProtocol (SNMP) settings. SNMP is a popular network monitoring and man-agement protocol. The Identification settings let you designate the Contact, Device Name, andLocation information for the Access Point. The SNMP Community settingsallow names to be assigned to any SNMP communities that have been set up inthe network. You can define two different SNMP communities, with the defaultnames being Public and Private.•SNMP. To enable the SNMP support feature, select Enable. Otherwise,select Disable.•Identification. In the Contact field, enter contact information for theAccess Point. In the Device Name field, enter the name of the Access Point.In the Location field, specify the area or location where the Access Pointresides.•SNMP Community. You may change the name from its default, Public.Enter a new name in the Public field. Then configure the community'saccess as either Read-Only or Read-Write.You may change the name fromits default, Private. Enter a new name in the Private field. Then configurethe community's access as either Read-Only or Read-Write.When you’ve completed making any changes on this tab, click the Apply but-ton to save those changes or Cancel to cancel your changes. For more infor-mation on this tab, you can click the Help button.•Beacon Interval. This value indicates the frequency interval of the beacon.The default value is 100. Enter a value between 20 and 1000 milliseconds.The Beacon Interval value indicates the frequency interval of the beacon. Abeacon is a packet broadcast by the Access Point to synchronize the wire-less network. •RTS Threshold. This value should remain at its default setting of 2346.Should you encounter inconsistent data flow, only minor reductions are rec-ommended.•Fragmentation Threshold. This value specifies the maximum size for apacket before data is fragmented into multiple packets. It should remain atits default setting of 2346. A smaller setting means smaller packets, whichwill create more packets for each transmission. Only minor reductions ofthis value are recommended.•DTIM Interval. The default value is 3. This value, between 1 and 255 mil-liseconds, indicates the interval of the Delivery Traffic Indication Message(DTIM). A DTIM field is a countdown field informing clients of the nextwindow for listening to broadcast and multicast messages. When the AccessPoint has buffered broadcast or multicast messages for associated clients, itsends the next DTIM with a DTIM Interval value. Access Point Clientshear the beacons and awaken to receive the broadcast and multicast mes-sages. When you’ve completed making any changes on this tab, click the Apply but-ton to save those changes or Cancel to cancel your changes. For more infor-mation on this tab, you can click the Help button.The SNMP TabFigure 6-14
Wireless-G Access PointWhat 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 asingle Access Point. Before using the roaming function, the workstation mustmake sure that it is the same channel number as the Access Point of the dedi-cated coverage 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 currentlybeing 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 orwhether it should seek a new one. When a node no longer receives acknowl-edgment from its original Access Point, it undertakes a new search. Upon find-ing a new Access Point, it then re-registers, and the communication processcontinues.What is BSS ID?A specific Ad-hoc LAN is called a Basic Service Set (BSS). Computers in aBSS must be configured with the same BSS ID.What is ESSID?An Infrastructure configuration could also support roaming capability formobile workers. More than one BSS can be configured as an Extended ServiceSet (ESS). Users within an ESS could roam freely between BSSs while main-taining a continuous connection to the wireless network stations and AccessPoints.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 available31Instant Wireless® SeriesAppendix A: TroubleshootingThis chapter provides solutions to problems usually encountered during theinstallation and operation of the Access Point. Read the description below tosolve your problems. If you can’t find an answer here, check the Linksys web-site at www.linksys.com.Can the Access Point act as my DHCP Server?No. The Access Point is nothing more than a wireless hub, and as such cannotbe configured to handle DHCP capabilities.Can I run an application from a remote computer over the wireless net-work?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 multiplayer games with other users 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 IEEE 802.11b features 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 wireless LAN is a group of computers, each with a WLAN adapter,connected as an independent wireless LAN. An Ad-hoc wireless LAN is appli-cable at a departmental scale for a branch or SOHO operation.What is Infrastructure?An integrated wireless and wired LAN is called an Infrastructure configura-tion. Infrastructure is applicable to enterprise scale for wireless access to a cen-tral database, or wireless application for mobile workers.30Frequently Asked Questions
Wireless-G Access PointWhat is WEP?WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 40-bitshared-key algorithm, as described in the IEEE 802.11 standard. What is a MAC Address?The Media Access Control (MAC) address is a unique number assigned by themanufacturer to any Ethernet networking device, such as a network adapter,that allows the network to identify it at the hardware level. For all practical pur-poses, this number is usually permanent. Unlike IP addresses, which canchange every time a computer logs on to the network, the MAC address of adevice stays the same, making it a valuable identifier for the network.How do I avoid interference?Using multiple Access Points on the same channel and in close proximity toone another will generate interference. When employing multiple AccessPoints, be sure to operate each one on a different channel (frequency).How do I reset the Access Point?Press the Reset button on the back of the Access Point for about ten seconds.This will reset the unit to its default settings.How do I resolve issues with signal loss?There is no way to know the exact range of your wireless network without test-ing. Every obstacle placed between an Access Point and wireless PC will cre-ate signal loss. Leaded glass, metal, concrete floors, water and walls will inhib-it the signal and reduce range. Start with your Access Point and your wirelessPC in the same room and move it away in small increments to determine themaximum range in your environment. You may also try using different channels, as this may eliminate interferenceaffecting only one channel. Also, due to FCC regulations, more power may betransmitted, using 802.11a, on channels 52, 56, 60 and 64, than on the lowerchannels. Lastly, check the Advanced tab of the Web-Based Utility and makesure that FULL is selected in the Transmission Rate field.Does the Access Point function as a firewall?No. The Access Point is only a bridge from wired Ethernet to wireless clients. I have excellent signal strength, but I cannot see my network. WEP is probably enabled on the Access Point, but not on your wireless adapter(or vice versa). Verify that the same WEP Keys and levels (64 or 128 ) arebeing used on all nodes on your wireless network. 33Instant Wireless® Seriesworldwide. 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 pattern foreach 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 berecovered. Even if one or more bits in the chip are damaged during transmis-sion, statistical techniques embedded in the radio 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. Would 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, the WLAN series offers the encryp-tion function (WEP) to enhance security and access control. Users can set it updepending upon their needs.Can Instant WirelessTM products support file and printer sharing?Instant WirelessTM products perform the same function as LAN products.Therefore, Instant WirelessTM products can work with Netware, WindowsNT/2000, or other LAN operating systems to support printer or file sharing.32
Wireless-G Access PointAppendix B: Setting Up the TCP/IP andIPX ProtocolsBefore a computer can communicate with the Access Point, it must be config-ured with the TCP/IP protocol. If you know how to set up TCP/IP on your com-puters, do so now. Otherwise, use the guidelines below to help get TCP/IPinstalled on all of the computers that need to communicate with the AccessPoint. If you are unable to successfully install TCP/IP on one or more comput-ers after following the directions, contact the manufacturer of your computers'network operating system for further assistance. Check with your networkadministrator for your TCP/IP settings. The directions below provide general guidelines for coming up with IP address-es and subnet masks. Check with your network administrator to see if you needto use specific IP addresses or DHCP settings.First, each computer on the network will require an IP address, which is a seriesof numbers, separated by periods, identifying the PC on the network. To makethings simple, you should use the following numbering scheme: 192.168.1.X In this example, X is a unique, arbitrarily assigned number from 1 to 254. Eachcomputer must have its own unique X number. Note: Never use 0, 250 or 255for X. These numbers are reserved by TCP/IP for other uses. For example, if you have three computers, you could number them as follows: 192.168.1.17192.168.1.44192.168.1.126In this case, 17, 44, and 126 are arbitrary numbers between 1 and 254. Each computer will also require a subnet mask, which is a numerical “filter”that tells a computer what kinds of TCP/IP data packets to accept. If you’re notsure which mask to use, the following mask is recommended:255.255.255.0 35Instant Wireless® SeriesWhat is the maximum number of users the Access Point facilitates?No more than 65, but this depends on the volume of data and may be less ifmany users create a large amount of network traffic. How many channels/frequencies are available with the Access Point?Using 802.11b or draft 802.11g, there are eleven available channels, rangingfrom 1 to 11. 34Setting Up TCP/IP in Windows
Wireless-G Access Point1. Click the Start button, select Settings, and open the Control Panel. Insidethe Control Panel, double-click the Network icon.2. When the Network window appears, click the Protocols tab. Then, clickthe Add button.3. Find the TCP/IP protocol in the Select Network Protocol field. Click itonce and then click the OK button.4. When asked if you want to use DHCP, choose No.5. If asked to supply your Windows NT CD, do so. NT will copy the neces-sary files to your system. You may have to switch between the AccessPoint’s Setup CD and the NT CD.6. When TCP/IP appears in the Network Protocols window, click theBindings tab. Windows will store your new bindings. 7. Click the Protocols tab. Then, select TCP/IP.8. Click the Properties button. Select the type of network adapter you havefrom the Adapters box and select Specify an IP Address. 9. Enter the computer’s IP Address and Subnet Mask. Check with your net-work administrator for your settings.10. Enter your Default Gateway if you have one.11. When you finish, click the OK button. If NT asks about WINS, ignore it. 12. When the Network window reappears, click the Close button. Restart yourcomputer when prompted. TCP/IP has now been successfully installed. 1. Click the Start button, select Settings, and open the Control Panel. Insidethe Control Panel, double-click the Network icon.37Instant Wireless® SeriesThe following instructions are provided as examples for reference only. Forcomplete instructions on installing and troubleshooting TCP/IP and IPX, con-sult your Windows operating system documentation.1. Click the Start button, select Settings, and open the Control Panel. Insidethe Control Panel, double-click the Network icon.2. If the TCP/IP Protocol is listed for your network adapter, go to step five.Otherwise, click the Add button.3. When the Component Type window appears, select Protocol and click theAdd button.4. Select Microsoft in the Manufacturers list and choose TCP/IP in theNetwork Protocols list. Then, click the OK button.5. When the Network window reappears, click TCP/IP. Then, click theProperties button.6. Select Specify an IP Address. 7. Enter an IP Address for the computer, along with a Subnet Mask. Click theOK button. If you do not have these values, consult your network adminis-trator.8. When the Network window reappears, click the OK button. Restart yourmachine. TCP/IP has now been successfully installed.1. Click the Start button, select Settings, and open the Control Panel. Insidethe Control Panel, double-click the Network icon.2. If the TCP/IP Protocol is listed for your network adapter, go to step four.Otherwise, click the Add button.3. When the Component Type window appears, select Protocol and click theAdd button.4. Select Microsoft in the Manufacturers list and choose IPX/SPX protocolin the Network Protocols list. Then, click the OK button.36TCP/IP Setup for Windows NT 4.0Note: a Default Gateway is not required. Check with your network administrator.IPX Setup for Windows NT 4.0TCP/IP Setup for Windows 98 and MillenniumIPX Setup for Windows 98 and Millennium
Wireless-G Access Point4. Select NWLink IPX/SPX/NetBIOS Compatible Transport Protocolfrom the list and click the OK button. 5. When the Network window reappears, click the OK button. Restart yourcomputer. NWLink IPX/SPX/NetBIOS Compatible Transport Protocol hasnow been successfully installed.1. Click the Start button and open the Control Panel.2. Double click the Network and Internet Connections icon.3. Double click the Network Connections icon.4. Right click the Local Area Connection icon and select Properties.5. If the TCP/IP Protocol is listed for your network adapter, go to step five.Otherwise, click the Install button.6. When the Component Type window appears, select Protocol, and click theAdd button.7. Select Internet Protocol (TCP/IP) from the list and click the OK button.8. When the Local Area Connection Properties window reappears, selectTCP/IP, and click the Properties button.9. Select Use the following IP Address. 10. Enter an IP Address for the computer, along with a Subnet Mask andDefault Gateway. Then, click the OK button. If you do not have these val-ues, consult your network administrator.11. When the Local Area Connection Properties window reappears, click theOK button. TCP/IP has now been successfully installed..39Instant Wireless® Series2. When the Network window appears, click the Protocols tab. Then, clickthe Add button.3. Find the IPX/SPX protocol in the Select Network Protocol field. Click itonce and click the OK button.1. At the Windows 2000 desktop, right click My Network Places and selectProperties. Then, right click Local Area Connection. Choose Properties.2. If the TCP/IP Protocol is listed for your network adapter, go to step five.Otherwise, click the Install button.3. When the Component Type window appears, select Protocol, and click theAdd button.4. Select Internet Protocol (TCP/IP) from the list and click the OK button.5. When the Local Area Connection Properties window reappears, selectTCP/IP, and click the Properties button.6. Select Use the following IP Address. 7. Enter an IP Address for the computer, along with a Subnet Mask andDefault Gateway. Then, click the OK button. If you do not have these val-ues, consult your network administrator.8. When the Local Area Connection Properties window reappears, click theOK button. TCP/IP has now been successfully installed.1. At the Windows 2000 desktop, right click My Network Places. Then rightclick Local Area Connection. Choose Properties.2. If the NWLink IPX/SPX/NetBIOS Compatible Transport Protocol is listedfor your network adapter, click the Cancel button. Otherwise, click theInstall button.3. When the Component Type window appears, select Protocol and click theInstall button.38TCP/IP Setup for Windows XPTCP/IP Setup for Windows 2000IPX Setup for Windows 2000
Wireless-G Access Point41Instant Wireless® Series40Browser - A browser is an application program that provides a way to look atand interact with all the information on the World Wide Web or PC. The word"browser" seems to have originated prior to the Web as a generic term for userinterfaces that let you browse text files online. BSS (Basic Service Set) - A group of wireless Network PC Card users and anAccess Point.Buffer - A buffer is a shared or assigned memory area used by hardwaredevices or program processes that operate at different speeds or with differentsets of priorities. The buffer allows each device or process to operate withoutbeing held up by the other. In order for a buffer to be effective, the size of thebuffer and the algorithms for moving data into and out of the buffer need to beconsidered by the buffer designer. Like a cache, a buffer is a "midpoint holdingplace" but exists not so much to accelerate the speed of an activity as to sup-port the coordination of separate activities. CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) - In localarea 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 ifthe time allocated is short compared to packet length and if the number of sit-uations is small.CSMA/CD (Carrier Sense Multiple Access/Collision Detection) - The LANaccess method used in Ethernet. When a device wants to gain access to the net-work, it checks to see if the network is quiet (senses the carrier). If it is not, itwaits a random amount of time before retrying. If the network is quiet and twodevices access the line at exactly the same time, their signals collide. When thecollision is detected, they both back off and each wait a random amount of timebefore retrying. CTS (Clear To Send) - An RS-232 signal sent from the receiving station to thetransmitting station that indicates it is ready to accept data.Database - A database is a collection of data that is organized so that its con-tents can easily be accessed, managed, and updated. 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 aAppendix C: 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.802.11g - A proposed, but as yet unratified extension of the IEEE 802.11 stan-dard for wireless networking hardware. The draft 802.11g specifications usedby Linksys specify a maximum data transfer rate of 54Mbps using OFDMmodulation, an operating frequency of 2.4GHz, backward compatibility withIEEE 802.11b devices and WEP encryption for security.Adapter - Printed circuit board that plugs into a PC to add to capabilities orconnectivity to a PC. In a networked environment, a network interface card isthe typical adapter that allows the PC or server to connect to the intranet and/orInternet.Ad-hoc Network - An ad-hoc network is a wireless network or other small net-work in which some of the network devices are part of the network only for theduration of a communications session while in some close proximity to the restof the network.Backbone - The part of a network that connects most of the systems and net-works together and handles the most data.Bandwidth - The transmission capacity of a given facility, in terms of howmuch data the facility can transmit in a fixed amount of time; expressed in bitsper second (bps).Beacon Interval - A beacon is a packet broadcast by the Access Point to keepthe network synchronized. A beacon includes the wireless LAN service area,the AP address, the Broadcast destination addresses, a time stamp, DeliveryTraffic Indicator Maps, and the Traffic Indicator Message (TIM).Bit - A binary digit. The value - 0 or 1-used in the binary numbering system.Also, the smallest form of data.
Wireless-G Access Point43Instant Wireless® Series42Dynamic 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. Encryption - A security method that applies a specific algorithm to data inorder to alter the data's appearance and prevent other devices from reading theinformation. ESS - More than one BSS in a network.Ethernet - IEEE standard network protocol that specifies how data is placedon and retrieved from a common transmission medium. Has a transfer rate of10 Mbps. Forms the underlying transport vehicle used by several upper-levelprotocols, including TCP/IP and XNS.FHSS (Frequency Hopping Spread Spectrum) - FHSS continuously changesthe center frequency of a conventional carrier several times per second accord-ing to a pseudo-random set of channels, while chirp spread spectrum changesthe carrier frequency. Because a fixed frequency is not used, illegal monitoringof spread spectrum signals is extremely difficult, if not downright impossibledepending on the particular method.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. Fragmentation - Breaking a packet into smaller units when transmitting overa network medium that cannot support the original size of the packet. Gateway - A device that interconnects networks with different, incompatiblecommunications 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 computerfrom the program you put in it to make it do things. The program came to beknown as the software.Hub - The device that serves as the central location for attaching wires fromworkstations. Can be passive, where there is no amplification of the signals; oractive, where the hubs are used like repeaters to provide an extension of thecable that connects to a workstation.unique 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. DHCP supports static addresses for computers containing Web servers thatneed a permanent IP address. Download - To receive a file transmitted over a network. In a communicationssession, download means receive, upload means transmit. Driver - A workstation or server software module that provides an interfacebetween a device and the upper-layer protocol software running in the comput-er; it is designed for a specific device, and is installed during the initial instal-lation of a network-compatible client or server operating system.DSSS (Direct-Sequence Spread-Spectrum) - DSSS generates a redundant bitpattern for each bit to be transmitted. This bit pattern is called a chip (or chip-ping code). The longer the chip, the greater the probability that the original datacan be recovered. Even if one or more bits in the chip are damaged duringtransmission, statistical techniques embedded in the radio can recover the orig-inal data without -the need for retransmission. To an unintended receiver, DSSSappears as low power wideband noise and is rejected (ignored) by most nar-rowband receivers. DTIM (Delivery Traffic Indication Message) - A DTIM field is a countdownfield informing clients of the next window for listening to broadcast and mul-ticast messages. When the AP has buffered broadcast or multicast messages forassociated clients, it sends the next DTIM with a DTIM Interval value. APClients hear the beacons and awaken to receive the broadcast and multicastmessages.
Wireless-G Access PointMulticasting - Sending data to a group of nodes instead of a single destination.Network - A system that transmits any combination of voice, video and/or databetween users. Node - A network junction or connection point, typically a computer or workstation.OFDM - OFDM (Orthogonal Frequency Division Muliplexing) works bybreaking one high-speed data stream into a number of lower-speed datastreams, which are then transmitted in parallel. Each lower speed stream is usedto modulate a subcarrier. Essentially, this creates a multi-carrier transmissionby dividing a wide frequency band or channel into a number of narrower fre-quency bands or sub-channels.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 WEPencryption process by automatically generating the WEP encryption keys forLinksys products.PC Card - A credit-card sized removable module that contains memory, I/O,or a hard disk. Port - A pathway into and out of the computer or a network device such as aswitch or router. For example, the serial and parallel ports on a personal com-puter are external sockets for plugging in communications lines, modems andprinters. RJ-45 (Registered Jack-45) - A connector similar to a telephone connector thatholds up to eight wires, used for connecting Ethernet devices.Roaming - The ability to use a wireless device and be able to move from oneaccess point's range to another without losing the connection.Router - Protocol-dependent device that connects subnetworks together.Routers are useful in breaking down a very large network into smaller subnet-works; they introduce longer delays and typically have much lower throughputrates than bridges. RTS (Request To Send) - An RS-232 signal sent from the transmitting stationto the receiving station requesting permission to transmit. 45IEEE (The Institute of Electrical and Electronics Engineers) - The IEEEdescribes itself as "the world's largest technical professional society, promotingthe development and application of electrotechnology and allied sciences forthe benefit of humanity, the advancement of the profession, and the well-beingof 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 - An infrastructure network is a wireless network or other smallnetwork in which the wireless network devices are made a part of the networkthrough the Access Point which connects them to the rest of the network.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 requestor or the e-mail sender and can respondby sending another message using the IP address it received. ISM band - The FCC and their counterparts outside of the U.S. have set asidebandwidth 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 - 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 (Media Access Control) Address - A unique number assigned by themanufacturer 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.44Instant Wireless® Series
Wireless-G Access Pointunits of data (called packet) that a message is divided into for efficient routingthrough the Internet. TCP/IP (Transmission Control Protocol/Internet Protocol) - The basic com-munication language or protocol of the Internet. It can also be used as a com-munications protocol in a private network (either an intranet or an extranet).When you are set up with direct access to the Internet, your computer is pro-vided with a copy of the TCP/IP program just as every other computer that youmay send messages to or get information from also has a copy of TCP/IP.Throughput - The amount of data moved successfully from one place to anoth-er in a given time period.Topology - A network's topology is a logical characterization of how thedevices on the network are connected and the distances between them. Themost 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-areaconnections.Upgrade - To replace existing software or firmware with a newer version. Upload - To transmit a file over a network. In a communications session,upload means transmit, download means receive. UTP - Unshielded twisted pair is the most common kind of copper telephonewiring. Twisted pair is the ordinary copper wire that connects home and manybusiness computers to the telephone company. To reduce crosstalk or electro-magnetic induction between pairs of wires, two insulated copper wires aretwisted around each other. Each signal on twisted pair requires both wires.Since some telephone sets or desktop locations require multiple connections,twisted pair is sometimes installed in two or more pairs, all within a singlecable. WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit, 128-bit, or 256-bit shared key algorithm, as described in the IEEE 802.11standard. 47Instant Wireless® SeriesServer - Any computer whose function in a network is to provide user accessto files, printing, communications, and other services. Software - Instructions for the computer. A series of instructions that performsa particular task is called a "program." The two major categories of software are"system software" and "application software." System software is made up ofcontrol programs such as the operating system and database management sys-tem (DBMS). Application software is any program that processes data for theuser.A common misconception is that software is data. It is not. Software tells thehardware how to process the data.SOHO (Small Office/Home Office) - Market segment of professionals whowork 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 communications systems. It is designed to trade off bandwidth efficiencyfor reliability, integrity, and security. In other words, more bandwidth is con-sumed than in the case of narrowband transmission, but the trade off producesa signal that is, in effect, louder and thus easier to detect, provided that thereceiver knows the parameters of the spread-spectrum signal being broadcast.If a receiver is not tuned to the right frequency, a spread-spectrum signal lookslike background noise. There are two main alternatives, Direct SequenceSpread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).Static IP Address - A permanent IP address that is assigned to a node in an IPor a TCP/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. 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. Adevice for making, breaking, or changing the connections in an electrical cir-cuit.TCP (Transmission Control Protocol) - A method (protocol) used along withthe Internet Protocol (Internet Protocol) to send data in the form of messageunits between computers over the Internet. While IP takes care of handling theactual delivery of the data, TCP takes care of keeping track of the individual46
Wireless-G Access Point49Instant Wireless® SeriesAppendix D: SpecificationsStandards Draft 802.11g, 802.11bChannels 11 Channels (USA)13 Channels (Europe)14 Channels (Japan) Port One 10/100, Auto-Crossover (MDI/MDI-X) PortCabling Type Category 5 or betterData Rate Up to 54Mbps (Wireless),10/100Mbps (Ethernet)LEDs Power, DiagLAN Link/Act, Full/Col, 100WLAN Act, LinkTransmit Power 18 dBmReceive Sensitivity 11Mbps: -80 dBm(typical) 54Mbps: -65 dBmModulation CCK, DQPSK, DBPSK, OFDMNetwork Protocols TCP/IP, IPX, NetBEUI48Dimensions 7.32" x 6.89" x 1.89" (186 mm x 175 mm x 48 mm)Unit Weight 18.25 oz. (0.51 kg)Certifications FCC Class BOperating Temp. 32ºF to 104ºF (0ºC to 40ºC)Storage Temp. -4ºF to 158ºF (-20ºC to 70ºC)Operating Humidity 10% to 80%, Non-CondensingStorage Humidity 5% to 90%, Non-CondensingEnvironmental
Wireless-G Access Point51Instant Wireless® Series50Appendix F: Contact InformationFor help with the installation or operation of this product, contact LinksysTechnical Support at one of the phone numbers or Internet addresses below.Sales Information 800-546-5797 (LINKSYS)Technical Support 800-326-7114RMA (Return MerchandiseAuthorization) Issues www.linksys.com (or call 949-271-5461)Fax 949-261-8868Email support@linksys.comWeb http://www.linksys.comFTP Site ftp.linksys.comAppendix E: 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 LINKSYS’S LIABILITY EXCEED THE PRICEPAID FOR THE PRODUCT FROM DIRECT, INDIRECT, SPECIAL, INCI-DENTAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM THEUSE OF THE PRODUCT, ITS ACCOMPANYING SOFTWARE, OR ITSDOCUMENTATION. LINKSYS DOES NOT OFFER REFUNDS FOR ANYPRODUCT. LINKSYS OFFERS CROSS SHIPMENTS, A FASTER PROCESS FOR PRO-CESSING AND RECEIVING YOUR REPLACEMENT. LINKSYS PAYSFOR UPS GROUND ONLY. ALL CUSTOMERS LOCATED OUTSIDE OFTHE UNITED STATES OF AMERICA AND CANADA SHALL BE HELDRESPONSIBLE FOR SHIPPING AND HANDLING CHARGES. PLEASECALL LINKSYS FOR MORE DETAILS.
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