D-Link DWL-1800 user manual Free Space Loss

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Free Space Loss

Attenuation of the electromagnetic wave while propagating through space. This attenuation is calculated using the following formula:

Free space loss = 32.4 + 20xLog(FMHz) + 20xLog(RK m)

F is the RF frequency expressed in MHz.

R is the distance between the transmitting and receiving antennas (expressed in Km).

At 2.4 GHz, this formula is: 100+20xLog(RK m)

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Contents LinkAirPremier Table of Contents Troubleshooting Guide Table of Figures DWL-1800 Point-to-Multipoint ApplicationTable of Tables Using this Guide IntroductionSystem Description GeneralDWL-1800B BU Wireless Base Unit Link AirPremier DWL-1800 Functional DescriptionDWL-1800R RB Wireless Bridge Link AirPremier DWL-1800 Compatibility and StandardsInstallation Overview InstallationPacking List Outdoor Installation Considerations General Installation Scheme Pole MountingCollocating DWL-1800 Outdoor Units Site Selection FactorsPath of Clearest Propagation Physical ObstaclesRooftop Installation Antennas for Outdoor ApplicationsPath Loss Point-to-PointUsing Outdoor Range Tables PrecautionsAntenna Polarization Cell Size/Link DistanceInstalling the Outdoor Unit Compliance with Radio RegulationsHoles/Grooves/Screw Holes Connecting the Ground and Antenna Cables Connecting the Indoor-to-Outdoor CableInstalling the Indoor Unit Brown Phase ~ Blue Neutral Yellow/green Grounding Configuring Parameters Antenna AlignmentPage Verifying Correct Operation of the Indoor Unit Verifying Correct OperationName Description Functionality Verifying Correct Operation of the Outdoor Unit What to do if the Self Test failsD-LINK Airpremier DWL-1800 Configuration Utility Installing and Running the Configuration Utility Configuration Utility ModesControl Window Section Unit Configuration ModeTabs Section Control Window Selecting UnitsSetting the Snmp Community String Set IP Dialog BoxApplication Control Buttons Station Status Tab Configuration Utility TabsIP Parameters Tab IP Parameters Tab Snmp Parameters Tab Snmp Parameters TabCounters Tab Counters Tab BU/DWL-1800B Units?? Rx Counters ?? Tx Counters?? Link Counters ?? Resetting Counters Wlan Parameters TabWlan Parameters Tab RB/DWL-1800R Highest ChannelFrance Canada Channel FrequencyStation Control Tab Station Control TabSecurity Tab Security TabAdvanced Tab Advanced TabPage Firmware Upgrade Mode Trap Monitor TabTo upgrade firmware Firmware Upgrade Mode dialog boxFirmware Upgrade Process Advanced Tftp Settings Advanced Tftp Setup dialog boxMultiple Unit Configuration Mode Multiple Configuration Mode dialog boxReloading Factory Default Settings Resetting the Snmp Community StringsTo reset the unit to the factory defaults System Troubleshooting Troubleshooting GuideProblem Possible Cause Corrective Action Indication Technical Specifications Configuration and ManagementSupported Standards RadioRange SecurityOutdoor Unit-to-Indoor Unit Communication InterfacesElectrical Environmental Mechanical DimensionsStandards Compliance, General Appendix A. DWL-1800 FAQ GeneralDoes the DWL-1800B supports 802.1d spanning tree protocol? Collocation What is the throughput of the D-Link Air Premier DWL-1800? PerformanceCan the DWL-1800B/ DWL-1800R firmware be upgraded? FirmwareConfiguration Management What management options are available for the DWL-1800?Ethernet Connector Pin Assignments Appendix B. Preparing the Indoor to Outdoor CableIntroduction Appendix C. Radio Signal PropagationRF Terms and Definitions RF Power Level AttenuationFree Space Loss Antenna Characteristics Isotropic AntennaSystem Characteristics Link ParametersSignal Fading Link Budget CalculationLine of Sight Concept Clear Line of SightFresnel Zone Clear of Obstacles FCC Warning Avertissement AUX Utilisateurs Product Type Warranty Period What You Must Do For Warranty Service Trademarks Offices Registration Card Print, type or use block letters
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