D-Link DWL-1800 user manual Fresnel Zone Clear of Obstacles

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Figure 32: Fresnel Zone Clear of Obstacles

When at least 80% of the first Fresnel Zone is clear of obstacles, propagation loss is equivalent to that of free space.

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Contents LinkAirPremier Table of Contents Troubleshooting Guide DWL-1800 Point-to-Multipoint Application Table of FiguresTable of Tables Introduction Using this GuideSystem Description GeneralLink AirPremier DWL-1800 Functional Description DWL-1800B BU Wireless Base UnitLink AirPremier DWL-1800 Compatibility and Standards DWL-1800R RB Wireless BridgeInstallation Installation OverviewPacking List General Installation Scheme Pole Mounting Outdoor Installation ConsiderationsSite Selection Factors Collocating DWL-1800 Outdoor UnitsPath of Clearest Propagation Physical ObstaclesAntennas for Outdoor Applications Rooftop InstallationPath Loss Point-to-PointPrecautions Using Outdoor Range TablesAntenna Polarization Cell Size/Link DistanceCompliance with Radio Regulations Installing the Outdoor UnitHoles/Grooves/Screw Holes Connecting the Indoor-to-Outdoor Cable Connecting the Ground and Antenna CablesInstalling the Indoor Unit Brown Phase ~ Blue Neutral Yellow/green Grounding Antenna Alignment Configuring ParametersPage Verifying Correct Operation Verifying Correct Operation of the Indoor UnitName Description Functionality What to do if the Self Test fails Verifying Correct Operation of the Outdoor UnitD-LINK Airpremier DWL-1800 Configuration Utility Configuration Utility Modes Installing and Running the Configuration UtilityUnit Configuration Mode Control Window SectionTabs Section Selecting Units Control WindowSet IP Dialog Box Setting the Snmp Community StringApplication Control Buttons Configuration Utility Tabs Station Status TabIP Parameters Tab IP Parameters Tab Snmp Parameters Tab Snmp Parameters TabCounters Tab BU/DWL-1800B Units Counters Tab?? Tx Counters ?? Rx Counters?? Link Counters Wlan Parameters Tab ?? Resetting CountersWlan Parameters Tab RB/DWL-1800R Channel HighestChannel Frequency France CanadaStation Control Tab Station Control TabSecurity Tab Security TabAdvanced Tab Advanced TabPage Trap Monitor Tab Firmware Upgrade ModeFirmware Upgrade Mode dialog box To upgrade firmwareFirmware Upgrade Process Advanced Tftp Setup dialog box Advanced Tftp SettingsMultiple Configuration Mode dialog box Multiple Unit Configuration ModeResetting the Snmp Community Strings Reloading Factory Default SettingsTo reset the unit to the factory defaults Troubleshooting Guide System TroubleshootingProblem Possible Cause Corrective Action Indication Configuration and Management Technical SpecificationsSupported Standards RadioSecurity RangeOutdoor Unit-to-Indoor Unit Communication InterfacesElectrical Mechanical Dimensions EnvironmentalStandards Compliance, General General Appendix A. DWL-1800 FAQDoes the DWL-1800B supports 802.1d spanning tree protocol? Collocation Performance What is the throughput of the D-Link Air Premier DWL-1800?Firmware Can the DWL-1800B/ DWL-1800R firmware be upgraded?Configuration What management options are available for the DWL-1800? ManagementAppendix B. Preparing the Indoor to Outdoor Cable Ethernet Connector Pin AssignmentsAppendix C. Radio Signal Propagation IntroductionRF Terms and Definitions Attenuation RF Power LevelFree Space Loss Isotropic Antenna Antenna CharacteristicsLink Parameters System CharacteristicsLink Budget Calculation Signal FadingClear Line of Sight Line of Sight ConceptFresnel Zone Clear of Obstacles FCC Warning Avertissement AUX Utilisateurs Product Type Warranty Period What You Must Do For Warranty Service Trademarks Offices Print, type or use block letters Registration Card