Linksys WRT150N manual What is infrastructure mode?, What is roaming?, What is ISM band?

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Wireless-N Home Router

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 to communicate continuously while the user and computer are moving freely throughout an area greater than that covered by a single 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 coverage area.

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 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).

Appendix A: Troubleshooting

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Frequently Asked Questions

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Contents GHz Wireless- N Copyright and Trademarks How to Use This User GuideWord definition Table of Contents Appendix C Upgrading Firmware Appendix D Windows Help Appendix a TroubleshootingAppendix B Wireless Security Common Problems and Solutions Frequently Asked QuestionsRouter’s Front Panel Router’s Back Panel26 Access Restrictions Tab Internet Access Policy Welcome IntroductionWhat’s in this User Guide? Wireless-N Home Router Network Topology Planning Your Wireless NetworkAd-Hoc versus Infrastructure Mode Ssid service set identifier your wireless network’s namePlanning Your Wireless Network Network Layout Back Panel Getting to Know the Wireless-N Home RouterTop Panel Front PanelHardware Installation Connecting the Wireless-N Home RouterOverview Configuring the Wireless-N Home RouterSetup WirelessApplications & Gaming Access RestrictionsAdministration SecurityStatus How to Access the Web-based UtilitySetup Tab Basic Setup Internet SetupPPPoE Static IPTelstra Cable PptpPacket a unit of data sent over a network Optional SettingsDhcp Server Setting Network SetupRouter IP Dhcp Reservation Time SettingDdns Service Setup Tab DdnsDynDNS.org TZO.com 10 Setup Tab Ddns TZO.comMAC Address Clone Setup Tab MAC Address CloneStatic Routing Setup Tab Advanced RoutingAdvanced Routing Dynamic Routing13 Routing Table Basic Wireless Settings Wireless Tab Basic Wireless SettingsPSK2-Personal Wireless Tab Wireless SecurityWireless Security PSK-PersonalPSK2-Enterprise PSK-EnterpriseRadius MAC Address Filter List Wireless Tab Wireless MAC FilterWireless MAC Filter Access RestrictionsAdvanced Wireless Wireless Tab Advanced Wireless SettingsWireless-N Home Router Firewall Security Tab FirewallInternet Filter Web FilterVPN Passthrough Security Tab VPN PassthroughInternet Access Policy Access Restrictions Tab Internet Access PolicyTo create a policy 28 List of PCs Single Port Forwarding Applications & Gaming Tab Single Port ForwardingPort Range Forwarding Applications & Gaming Tab Port Range ForwardingPort Range Triggering Applications & Gaming Tab Port Range TriggeringDMZ Applications & Gaming Tab DMZApplications and Gaming Tab QoS QoS Quality of ServiceWireless Internet Access Priority35 QoS Applications Add a New Application 39 QoS Voice Device SummaryRemote Access Administration Tab ManagementRouter Access Web AccessUPnP Backup and RestoreLog Administration Tab Log43 Administration Tab Diagnostics Administration Tab DiagnosticsFactory Defaults Administration Tab Factory DefaultsUpgrade Firmware Administration Tab Firmware UpgradeRouter Information Status Tab RouterInternet Connection Local Network Status Tab Local Network51 Status Tab Wireless Status Tab WirelessCommon Problems and Solutions Appendix a TroubleshootingNeed to set a static IP address on a PC Wireless-N Home Router Open a command prompt. For Windows 98SE and Me Application Name Protocol To IP Address EnabledCan’t get the Internet game, server, or application to work Application Name Start and End PortWireless-N Home Router My DSL service’s PPPoE is always disconnecting To start over, I need to set the Router to factory defaultsNeed to upgrade the firmware Firmware upgrade failed, and/or the Power LED is flashingPower LED keeps flashing Does the Router support IPX or AppleTalk? Frequently Asked QuestionsWhere is the Router installed on the network? Is IPSec Pass-Through supported by the Router?How can I block corrupted FTP downloads? Is the Router cross-platform compatible? What is DMZ Hosting?What are the advanced features of the Router? Will the Router function in a Macintosh environment?What Ieee 802.11b features are supported? What is the Ieee 802.11g standard?What is the Ieee 802.11b standard? What Ieee 802.11g features are supported?What is Spread Spectrum? What is infrastructure mode?What is roaming? What is ISM band?How do I resolve issues with signal loss? What is DSSS? What is FHSS? And what are their differences?What is a MAC Address? How do I reset the Router?Security Precautions Appendix B Wireless SecuritySecurity Threats Facing Wireless Networks Appendix B Wireless Security Wireless-N Home Router Appendix C Upgrading Firmware Figure C-1 Firmware UpgradeShared Resources Appendix D Windows HelpNetwork Neighborhood/My Network Places Windows 98SE or Me Instructions Figure E-1 IP Configuration ScreenFor the Router’s Web-based Utility Windows 2000 or XP InstructionsAppendix F Glossary Wireless-N Home Router Wireless-N Home Router Wireless-N Home Router Wireless-N Home Router Model Appendix G SpecificationsLEDs Storage Humidity Operating TempStorage Temp Operating HumidityLimited Warranty Appendix H Warranty InformationFCC Statement Appendix I Regulatory InformationWireless-N Home Router Wireless-N Home Router Wireless-N Home Router Wireless-N Home Router Wireless-G Home Router Need to contact Linksys? Appendix J Contact InformationInformation section in this Guide