Nortel Networks 411-2021-111 manual Cell Site Layouts, Omni cell site configuration

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Cell Site Layouts

This chapter provides information on the layout and cabling of the different DualMode Metrocell configurations.

Important

For ALL Metrocell cell site configurations, the frequency plan used should have a minimum of 21 channel spacing (630 kHz) between the channels in one RF Frame.

Note: The DualMode Metrocell supports only Transmit Receive Units (TRU) with Product Engineering Code (PEC) NTAX98AA. No other radios can be used. The NTAX98AA TRU supports full digital and analog transmissions in accordance with IS-54 and IS-41 standards.

Omni cell site configuration

The Metrocell in an omni configuration uses at least two equipment frames, one CE Frame and one RF frame (see Figure 3-1). With only one RF frame, the maximum number of Voice Channels (VCH) supported by the cell site is 22 since two of the 24 TRUs have to be assigned as the Control Channel (CCH) and the Locate Channel Receiver (LCR). As traffic grows, four additional RF frames can be added to the site to accommodate up to a maximum of 120 channels, including the CCH and the LCR.

An RF Frame with up to 20 channels requires only one duplexer in the RF Frame and one TX/RX antenna. The outputs of the three AutoTune Combiners (ATC) are combined through one phasing transformer (located at ATC 2) and then connected to Duplexer position 2. This configuration requires a RX only antenna for the diversity receive function of the cell. See Figure 3-2.

An RF Frame with 21 channels or more requires two duplexers in the RF Frame and two TX/RX antennas. The outputs of the lower and middle ATCs

DMS-MTX DualMode Metrocell Cell Site Description

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Contents DualMode Metrocell Page Page June Publication historyContents Appendices Power and Grounding RequirementsCell Site Components Datafilling a Metro Cell SiteList of tables Block diagram of a 120 Stsr Metrocell using one RF FramePage Intended audience for this publication About this documentApplicability of this publication How this publication is organizedList of terms BandCarrier RF Duplexer CellDBm DBWLoss FilterForward path IsolationReturn loss ModulationOmni DqpskSignal RF SectorSectorization Stsr Northern Telecoms DualMode Metrocell IntroductionDigital ready cellular product System architecture of a DualMode MetrocellMetro RF Frame Basic components of a DualMode Metrocell Universal CE 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 Omni N=7 frequency reuse plan Sectorized configuration120 N=7 sectorized frequency reuse plan 60 N=4 sectorized frequency reuse plan Cell Site Layouts Omni cell site configurationRF Frame Control Channel redundancyCell Site Layouts 4Cell Site Layouts TRU/DPA Transmit cabling6Cell Site Layouts Frames TRUs ATCs Receive cablingComponent requirement No.Stsr cell site configuration CE Frame RF Frame Block diagram of a 120 Stsr Metrocell using one 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 Z Sector YSector Y TX/RX, 3 RX Sector W Stsr cell site connectionControl Channel Locate Channel Receiver Sector Sector U22Cell 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 Major components of a DualMode Metrocell Description Cell Site ComponentsNTAX98AA FRU Customer Service Operations 4Cell Site Components Standard 01.01 June Safety requirements Power and Grounding RequirementsPower and grounding requirements Power and Grounding Requirements 4Power and Grounding Requirements Power distribution for the CE and RF Frames in a Metrocell Frame power distributionGrounding UL/CSA approval System power protectionCEC par DC coupled signals Cable Identification 10Power and Grounding Requirements Standard 01.01 June Datafill Overview Datafilling a Metro Cell SiteTable Acualm Table ClliAlarm Points Metro RF Frame ATCCavities Fan Pwr Hsmo +27V a Rip Connector J206 Table VCHINV, CCHINV, LcrinvPort # Example of Metro TRU datafill Frequency Assignment ExampleIcrm Example of Metro ICRM/TRU hardwire configuration8Datafilling a Metro Cell Site Standard 01.01 June Appendix a DualMode Metrocell Cell Site Specifications System ConfigurationRadio Frequency Audio Interface AlarmsDC Power Requirements Power Distribution RequirementsMechanical Environmental PackagingRegulatory Electromagnetic Emissions Radiated EmissionsTelecom Compliance Product Safety =7 Frequency plan Band a Appendix B Frequency Plans=7 Frequency plan Band B =4 Frequency plan Band B =4 Frequency plan Band a10Frequency Plans Standard 01.01 June Page Cell Site Description