Linksys WRT54GP2 manual What is ISM band?, What is Spread Spectrum?

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Wireless-G Broadband Router with 2 Phone Ports

simultaneously requires a dynamic RF networking technology that links access points and nodes. In such a system, the user’s end node undertakes a search for the best possible access to the system. First, it 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 down the backbone.

As the user moves on, the end node’s RF transmitter regularly checks the system 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 developed by the military for use in reliable, secure, mission-critical communications 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 are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

74	Appendix A: Troubleshooting
	Frequently Asked Questions

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Contents Wireless- G Page Copyright and Trademarks How to Use this GuideWord definition Wireless-G Broadband Router with 2 Phone Ports Table of Contents Appendix C Finding the MAC Address Vonage LinksysWireless Network Access Wireless Security WEPList of Figures 39 Status Tab Local Network Introduction WelcomeWhat’s in this Guide? Introduction What’s in this Guide? Wireless-G Broadband Router with 2 Phone Ports Ssid your wireless network’s name Planning Your Wireless NetworkAd-Hoc versus Infrastructure Mode Network TopologyNetwork Layout Getting to Know the Router Back PanelFront Panel WlanConnecting the Router OverviewConnection Instructions Connect a PCConfiguring the Router Wireless SetupSecurity Voice AdministrationApplications & Gaming How to Access the Web-based Utility StatusInternet Connection Type Setup Tab Basic SetupInternet Setup Obtain an IP automaticallyStatic IP PPPoE Pptp Heart Beat Signal Router IP Network SetupOptional Settings Packet a unit of data sent over a networkNetwork Address Server Settings Dhcp Setup Tab Ddns Time SettingDynDNS.org TZO.comSetup Tab MAC Address Clone MAC CloneSetup Tab Advanced Routing Advanced Routing13 Routing Table Entry List Wireless Tab Basic Wireless Settings Wireless Tab Wireless Security 15 Wireless Tab Wireless Security WPA Pre-Shared Key16 Wireless Tab Wireless Security WPA Radius Wireless Tab Wireless Network Access 18 Wireless Tab Wireless Network AccessWireless Tab Advanced Wireless Settings 20 Advanced Wireless SettingsWireless-G Broadband Router with 2 Phone Ports Filter Port Range Security Tab FilterFilter IP Address Range Filter MAC AddressBlock WAN Requests Internet requestsSecurity Tab VPN Passthrough VPN PassthroughPort Range Forwarding Voice TabApplications & Gaming Tab Port Range Forwarding Port Range26 Applications & Gaming Tab Port Triggering UPnP Forwarding Applications & Gaming Tab UPnP ForwardingForwarded Range Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Applications & Gaming Tab DMZ DMZApplications & Gaming Tab QoS Application-based QoSPort-based QoS Specific Port# fieldsVoice QoS Local Router Access Administration Tab ManagementRouter Password Remote Router AccessBackup and Restore UPnPAdministration Tab Log LogRuns a networking device Administration Tab Factory DefaultsAdministration Tab Firmware Upgrade Firmware with a newer versionLine1 Status Status Tab VoiceInformation Line2 StatusStatus Tab Router 38 Status Tab RouterStatus Tab Local Network Local NetworkStatus Tab Wireless Appendix a Troubleshooting Common Problems and SolutionsFor Windows 98 and Millennium Need to set a static IP address on a PCFor Windows For Windows XPWant to test my Internet connection For Windows XP Wireless-G Broadband Router with 2 Phone Ports Am not able to access the Router’s Web-based Utility Setup Need to set up a server behind my Router Application Start and End Protocol IP Address Enabled TCPCan’t get the Internet game, server, or application to work Appendix a Troubleshooting Common Problems and Solutions For Microsoft Internet Explorer 5.0 or higher To start over, I need to set the Router to factory defaultMy DSL service’s PPPoE is always disconnecting For Netscape 4.7 or higherWireless-G Broadband Router with 2 Phone Ports Go through this checklist until your problem is solved Frequently Asked Questions What is Network Address Translation and what is it used for? How can I block corrupted FTP downloads? What is DMZ Hosting? If all else fails in the installation, what can I do?Will the Router function in a Macintosh environment? Which modems are compatible with the Router? Is the Router cross-platform compatible?How many ports can be simultaneously forwarded? How can I check whether I have static or Dhcp IP addresses?What is the Ieee 802.11g standard? What is the Ieee 802.11b standard?What Ieee 802.11b features are supported? What is infrastructure mode? What Ieee 802.11g features are supported?What is ad-hoc mode? What is roaming?What is ISM band? What is Spread Spectrum?What is WPA? What is DSSS? What is FHSS? And what are their differences?What is WEP? What is a MAC Address?Have excellent signal strength, but I cannot see my network How many channels/frequencies are available with the Router?Appendix B Wireless Security Security PrecautionsSecurity Threats Facing Wireless Networks Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Figure C-1 IP Configuration Screen Windows 98 or Me InstructionsWindows 2000 or XP Instructions For the Router’s Web-based UtilityShared Resources Appendix D Windows HelpNetwork Neighborhood/My Network Places Appendix D Windows Help Appendix E Glossary Appendix E Glossary Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Voice Protocol Appendix F SpecificationsModel UPnP able/cert CertifiedDimensions 32 x 1.89 x H x D Appendix G Warranty Information Limited WarrantyAppendix G Warranty Information Appendix H Regulatory Information FCC StatementSafety Notices Need to contact Vonage? VonageLinksys Hour 1-VONAGE-HELPLinksys

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