Linksys WET11 manual What is Spread Spectrum?

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Wireless-B Ethernet Bridge

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).

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 is 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 transmission, 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 narrowband receivers.

What is WEP?

WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 40/64 bit shared key algorithm, as described in the IEEE 802.11 standard.

Appendix A: Troubleshooting

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Frequently Asked Questions

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Contents 802 GHz .11b Wireless- B Copyright and Trademarks How to Use this GuideTable of Contents Wireless-B Ethernet Bridge Ad-Hoc Mode Infrastructure ModeIntroduction IntroductionWhat’s in this Guide? Wireless-B Ethernet Bridge Network Topology Ad-Hoc versus Infrastructure ModeAd-Hoc Mode LAN Getting to Know the Wireless-B Ethernet BridgePWR Connect the Ethernet Network Cable Connecting the Wireless-B Ethernet Bridge for SetupOverview Setting Up the Wireless-B Ethernet BridgeSetup Wizard List of Bridges Wireless Settings WEP Key Connecting the Wireless-B Ethernet Bridge for Network Use Starting the Web-based Utility Using the Wireless-B Ethernet Bridge Web-based UtilityWireless SetupSite Survey Password Tab MAC Address AdvancedWireless Settings LAN SettingsStatus LAN StatisticsHelp Tab HelpCommon Problems and Solutions Appendix a TroubleshootingWeb-based Utility doesn’t detect the Bridge Frequently Asked QuestionsWhat is ad-hoc mode? What is Spread Spectrum? What Are the Risks? Appendix B Wireless SecurityBrief Overview Jamming Attacks Passive AttacksActive Attacks Maximizing Wireless SecurityDictionary-Building or Table Attacks Man-in-the-Middle AttacksWireless-B Ethernet Bridge Ssid Wireless-B Ethernet Bridge Figure B-2 WEP Encryption WEP EncryptionAppendix C Upgrading Firmware Network Neighborhood/My Network Places Appendix D Windows HelpShared Resources Appendix E Glossary Wireless-B Ethernet Bridge Wireless-B Ethernet Bridge Wireless-B Ethernet Bridge Wireless-B Ethernet Bridge Wireless-B Ethernet Bridge Model Appendix F SpecificationsStandards Ieee 802.11b, Ieee Ports ButtonsStorage Humidity Warranty Year LimitedOperating Humidity Limited Warranty Appendix G Warranty InformationFCC Statement Appendix H Regulatory InformationIndustry Canada Canada Wireless-B Ethernet Bridge Appendix I Contact Information
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