4Motion Installation Manual, Ver.3.5 - Alvarion

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Chapter 2 - Safety and PrecautionsLightning Protection Guidelines2.3.2.3 Grounding Outdoor UnitsThe Alvarion Outdoor Unit, consisting of a Radio Frequency Unit and Antenna, includes a groundingpoint for connection to the grounding system. See Section 2.3.1.INFORMATIONFor standard communication sites with the following characteristics, grounding of the outdoor units isnot required (although such grounding will increase the level of protection):• The pole/tower is grounded• A standard Air Termination lightning rod is installed• Coaxial (IF/RF) cables are grounded at the facility entrance• The resistance between the Air Terminal and the Earth Termination is less than 5.2.3.2.4 Earth Termination SystemThe Earth Termination System is the part of external LPS that conducts and disperses lightning current toearth. See Figure 2-2.2.3.2.5 Lightning Protectors (Surge Arrestors)Lightning Protectors provide an additional protection to the Alvarion equipment embedded protectors,in places where lightning occurs frequently.Electrical surges are composed of two elements: voltage and quantity of charge. A very high voltagesurge can damage electronic equipment by breaking down the insulating medium between the circuitelements, or between the circuit elements and ground. In order to protect an electronic circuit fromdamage, a Lightning Protector (or Surge Arrestor) must conduct sufficient charge from the surge inorder to lower the surge voltage to a safe level. It must also conduct fast enough in order to prevent thecircuit insulation from breaking down.Alvarion products contain embedded Lightning Protectors at their IF input ports.Robust surge protection devices (SPD) are part of internal circuits, and are mounted on I/O portsconnecting Indoor and Outdoor units via outdoor cables.The BTS IDU and ODU IF ports are protected by high current capability TVSs mounted on board.If additional protection is required, for example, in high lightning activity (Keraunic) areas, externalLightning Protectors can be installed at strategic points at the site.INFORMATIONKeraunic maps are available at various links when searching for “Worldwide map of Keraunic levels”.A Lightning Protector will “clip” any excessive surge voltage that may be present on the centerconductor.4Motion Installation Manual20
Chapter 2 - Safety and PrecautionsLightning Protection GuidelinesFor Alvarion’s IF solutions, only “Gas Gap” Lightning Protectors types, designed to cover the IF frequencyrange, must be used. Only “Gas Gap” Lightning Protectors are capable of passing the DC currentrequired to power the Outdoor Unit.2.3.2.6 Installation Practices for an IF-Type SystemThis section relates to BTS outdoor installation practices. Figure 2-3 illustrates radio equipment installedon a tower.Referring to Figure 2-3, an Air Terminal (Lightning Rod) is attached to the top of the tower. The AirTerminal connects to a Down-Conductor that runs to an Earth Termination at the foot of the tower.Figure 2-3: Radio Equipment Mounted on a TowerINFORMATIONThe ground system must be maintained and checked periodically in accordance with local regulations.4Motion Installation Manual21
Page 1 and 2: 4Motion ®Installation ManualReleas
Page 3 and 4: Document HistoryTopic Description R
Page 5: Legal RightsDisclaimerLimitation of
Page 10 and 11: About This ManualAbout This ManualT
Page 12 and 13: ContentsContentsChapter 1 - Introdu
Page 14 and 15: Contents5.5.3 Connecting the Ethern
Page 16 and 17: Contents8.4.2 Connecting the Ground
Page 18 and 19: ContentsB.6.1 Installing an H-Brack
Page 20 and 21: FiguresFigure 4-13: Macro Indoor BT
Page 22 and 23: FiguresFigure 7-16: Mounting the Tw
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Page 26 and 27: TablesTablesTable 1-1: ODU Port Con
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Chapter 8 - IF CombinerInstallation
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Chapter 9 - Antenna InstallationInt
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Chapter 10 - GPS Installation“GPS
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Chapter 12 - MaintenanceODU and Ant
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Appendix A - InstallationReportIn T
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GlossaryAAAAISGANSIASCIIATMATPCAUAV
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4Motion Installation Manual, Ver.3.5 - Alvarion

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