Nortel Networks 411-2021-111 manual 4Power and Grounding Requirements

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5-4Power and Grounding Requirements

The input voltage for other communication equipment is typically -48 Vdc nominal. The voltage range at the Power Distribution Centre (or other type of a branch panel) shall not exceed the range between -43.75 Vdc to -55.80 Vdc.

The input power is usually obtained from a centralized plant, which may be shared with other systems or dedicated to the equipment.

Power plant batteries provide backup power for the equipment in case of power outage. The backup time is typically 8 hours at the site with no engine- alternator or 3 hours at the site with an emergency engine-alternator.

The grounding system of radio and transmission equipment typically conform to the Common Bonding Network (CBN) bonding topology.

Switching equipment conforms to the Isolated Bonding Network (IBN) grounding topology (typically, Star-IBN or Sparse-Mesh-IBN). Some systems also use a Star-IBN bonding topology where the Logic Return (LR) is isolated from the Framework Ground (FG) except at one clearly defined point.

411-2021-111 Standard 01.01 June 1996

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Contents

DualMode Metrocell Page Page Publication history JuneContents Power and Grounding Requirements Cell Site ComponentsDatafilling a Metro Cell Site AppendicesBlock diagram of a 120 Stsr Metrocell using one RF Frame List of tablesPage About this document Intended audience for this publicationHow this publication is organized Applicability of this publicationList of terms BandCarrier RF Cell DBmDBW DuplexerFilter Forward pathIsolation LossModulation OmniDqpsk Return lossSignal RF SectorSectorization Stsr Introduction Northern Telecoms DualMode MetrocellSystem architecture of a DualMode Metrocell Digital ready cellular productBasic components of a DualMode Metrocell Universal CE Frame Metro RF Frame800 MHz cellular band Channel assignment for 800 MHz cellular systemsChannel assignment Band a 416 channels Band B 416 channels Introduction 6Introduction Standard 01.01 June Cell Site Configurations Omni configurationOverview Sectorized configuration Omni N=7 frequency reuse plan120 N=7 sectorized frequency reuse plan 60 N=4 sectorized frequency reuse plan Omni cell site configuration Cell Site LayoutsControl Channel redundancy RF FrameCell Site Layouts 4Cell Site Layouts Transmit cabling TRU/DPA6Cell Site Layouts Receive cabling Component requirementNo. Frames TRUs ATCsStsr cell site configuration CE Frame Block diagram of a 120 Stsr Metrocell using one RF Frame RF FrameBlock diagram of a 120 Stsr Metrocell using three RF Frames 12Cell Site Layouts DPA 9 Port1 CCH ATC3 Port DPA 10 Port1 14Cell Site Layouts TRU/DPA ATC 16Cell Site Layouts Sector Sector Y Sector ZSector Y TX/RX, 3 RX Stsr cell site connection Control Channel Locate Channel Receiver SectorSector U Sector W22Cell Site Layouts Block diagram of a 60 Stsr Metrocell with two RF Frames 24Cell Site Layouts Block diagram of a 60 Stsr Metrocell with four RF Frames 26Cell Site Layouts Transmit cabling 28Cell Site Layouts TRU/DPA 30Cell Site Layouts Port2 ATC3 Port DPA Port1 RF Frame 32Cell Site Layouts Receive cabling 34Cell Site Layouts Sector Y 36Cell Site Layouts Component requirement 38Cell Site Layouts Standard 01.01 June Cell Site Components Major components of a DualMode Metrocell DescriptionNTAX98AA FRU Customer Service Operations 4Cell Site Components Standard 01.01 June Power and Grounding Requirements Safety requirementsPower and grounding requirements Power and Grounding Requirements 4Power and Grounding Requirements Frame power distribution Power distribution for the CE and RF Frames in a MetrocellSystem power protection Grounding UL/CSA approvalCEC par DC coupled signals Cable Identification 10Power and Grounding Requirements Standard 01.01 June Datafilling a Metro Cell Site Datafill OverviewTable Clli Table AcualmAlarm Points Metro RF Frame ATCCavities Fan Pwr Hsmo +27V a Rip Connector J206 Table VCHINV, CCHINV, LcrinvPort # Frequency Assignment Example Example of Metro TRU datafillExample of Metro ICRM/TRU hardwire configuration Icrm8Datafilling a Metro Cell Site Standard 01.01 June Appendix a DualMode Metrocell Cell Site Specifications System ConfigurationRadio Frequency Alarms Audio InterfaceDC Power Requirements Power Distribution RequirementsMechanical Packaging EnvironmentalRegulatory Electromagnetic Emissions Radiated EmissionsTelecom Compliance Product Safety Appendix B Frequency Plans =7 Frequency plan Band a=7 Frequency plan Band B =4 Frequency plan Band a =4 Frequency plan Band B10Frequency Plans Standard 01.01 June Page Cell Site Description