Enterasys Networks RBT-1602 manual Fresnel Zone and Line of Sight Clearance

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Determining the Antenna Locations

Line of Sight

The shape of the radio beam, defined as the Fresnel Zone, is widest in the middle. The Fresnel Zone is shown as the gray area between the antennas in Figure 1‐1. The exact shape and width of the Fresnel Zone is determined by the distance between the antenna and frequency of the radio signal.

The radius of the radio beam, shown as the lower half of the Fresnel Zone, is the distance from the center of the beam outward in any direction. The length of the radius is not based on the data rate and the type of antenna.

Figure 1-1 Fresnel Zone and Line of Sight Clearance

Total Distance

Radius

If a significant part of the Fresnel Zone is obstructed, a portion of radio energy is lost, resulting in reduced performance. For optimal performance, ensure that the antenna products you choose, in combination with the height of the antenna installation above ground, provide sufficient clearance to allow your antenna installation to cover the distance between the two sites.

Obstacles within the line of sight can significantly reduce the distance and performance. Obstructions include neighboring buildings, trees, and power lines, as shown in Figure 1‐2.

RoamAbout Antenna Site Preparation and Installation Guide 1-5

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Contents RoamAbout Page Page Page Contents Figures Appendix a SpecificationsTables RBTES-L200 Intended Audience About This GuideGetting Help Related DocumentsSupport@enterasys.com Techpubs@enterasys.comFollowing conventions are used in this guide Conventions Used in This GuideConventions Used in This Guide About This Guide Site Preparation Wireless Network Description Antenna Type Configuration Choosing Antennas for Wireless Network ConfigurationsAntennas for Wireless Network Configurations Distances with Cables Signaling GHz Antenna Cables used Rate Throughput MilesDetermining the Antenna Locations RBTES-AH-P23M/M0M GHz Antenna Cables used Signaling Throughput Miles RateFresnel Zone and Line of Sight Clearance Line of SightPotential Obstacles to Line of Sight not to scale Large Reflecting Surfaces Other Factors That Can Reduce Antenna RangeAdditional Location Requirements RBT-4102 Indoor/Outdoor Antenna Options Antenna ModelsRBT-4102 Indoor Only Antenna Option RBT-4102Model Number Name Frequency Restrictions RBT-1602 Indoor/Outdoor Antenna OptionsRBT-1602 Lightning Protector Cable OptionsCable Options and Model Numbers Lightning ProtectorPigtail Options Model Number Description Cable ConfigurationRoamAbout Pigtail Connection Options Mounting Requirements Contacting an Antenna Installation CompanyLightning Protection Installation Requirements Determining the Location of the AP AP Placement and ConfigurationRBT-4102 Overview of Connecting Cables to the Access PointRBT-4102 Installation Components RBT-4102 to Antenna Installation ComponentsComponent # ComponentRBT-1602 RBT-1602 to Antenna Installation ComponentsRBT-1602 Installation Components Page Antenna Installation Installation Overview Grounding System Lightning Protector Installation Lightning Protector Installation Selecting a Mast Mounting the AntennaRoamAbout Antennas Mast Diameters Antenna Part Number Mast DiameterAntenna Polarization Mount Mounting the Antenna Mounting on a Wide Mast Mounting the RoamAbout 2.4 GHz Directional Antenna# Component Mounting On a Narrow Mast Mounting the Antenna Mounting Sector Panel Antenna Wide Mast Mounting the RoamAbout 2.4 GHz Sector Panel Antenna# Component Mounting the Antenna RBT-1602 Antennas Solid Wall Installation Pole InstallationPart number RBTES‐BG‐S07120 Mounting On a Mast Mounting On a Wall Mounting the Antenna to a Wall Mounting the RoamAbout 5.8 GHz Panel AntennaAttaching the Antenna Bracket to the Antenna Mounting the Antenna to a Wall Attaching the Mast Brackets to the Antenna Bracket Mounting the Antenna to a MastMounting the Antenna Attaching the Bracket to the Antenna Mounting the 5.8 GHz Panel Antenna to the Mast Mounting the RoamAbout 4.9 to 5.9 GHz Sector Panel Antennas # Component External flap Screw and washer Using the Ceiling Mount Mounting the Antenna Component Connectors Connecting the Antenna CablesUsing the Female Pigtail 21 Male Pigtail Cable With Lightning Protector Using The Male PigtailAntenna Cable Route Connecting the CablesRoutine Maintenance Page Specifications Specification Value Electrical Table A-1 2.4 GHz Omni-Directional Antenna SpecificationsMechanical MountingRoamAbout 2.4 GHz Directional Panel Antenna RoamAbout 2.4 GHz Sector Panel Antenna Environmental RoamAbout 2.4 GHz 6 dBi 180 Degree Sector Panel AntennaRoamAbout 2.4 GHz 7 dBi 120 Degree Sector Panel Antenna RoamAbout 2.4 GHz 10 dBi 60 Degree Sector Panel Antenna Part number RBTES‐AW‐S10180 Part number RBTES‐AW‐S12120 Part number RBTES‐AW‐S1460 RoamAbout 5.3 GHz 10db Omni-Directional Antenna Table A-10 5.3 GHz Omni-Directional Antenna SpecificationsRoamAbout 5.8 GHz 10 dBi Omni-Directional Antenna Table A-11 5.8 GHz Omni-Directional Antenna SpecificationsEnvironmental Temperature RoamAbout 5.8 GHz Panel Antenna Table A-12 RoamAbout 5.8 GHz Panel Antenna SpecificationsSpecification Value Environmental RoamAbout 4.9 to 5.9 GHz Sector Panel Antenna Temperature To 75 C To 167F802.11a/b/g Range Extender Omni-Directional Antenna Specification ValueSpecification Value Mechanical Table A-15 Pigtail Connection SpecificationConnector Type RoamAbout Pigtail ConnectionLow-Loss Antenna Cable Table A-16 RBTES-L200 Cable SpecificationCable Loss Feet Table A-17 RBTES-L400 Cable SpecificationsTable A-18 RBTES-L600 Cable Specifications RoamAbout Lightning Protector Table A-19 Lightning Protector SpecificationsRoamAbout Lightning Protector Specifications
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