Introduction | Nortel Networks 411-2021-111 specification

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Introduction

Northern Telecom's DualMode Metrocell

As cellular systems evolve to the digital format, service providers and mobile subscribers are confronted by a mixture of analog and digital technologies. Northern Telecom (Nortel)’s dual mode cellular product allows a smooth transition from analog to digital technology. It uses Time Division Multiple Access (TDMA) technology for digital systems and Advanced Mobile Phone Service (AMPS) technology for analog systems. This evolutionary strategy enables service providers to gradually upgrade their cellular systems to digital while providing support of existing analog equipment.

The Nortel cellularsystem supporting dual mode service includesthe following components:

•the DMS-MTX switch containing the Intelligent Cellular Peripheral (ICP) unit at the mobile switching office

•dual mode cell sites with the configurable DualMode Radio Units (DRU) on a Radio Frequency (RF) Frame and the Integrated Cellular Remote Module (ICRM), on a Common Equipment (CE) Frame at the cell site

•external and internal interface links.

The Nortel DualMode Metrocell serves as the intelligent interface between a Digital Multiplex Switch - Mobile Telephone Exchange (DMS-MTX) and its registered cellular mobiles. It is a dual mode cell that works in both the analog (AMPS) mode and the digital (TDMA) mode.

The Metrocell is designed for high density, small radius cells in areas where large traffic capacity is required. It can exist independently or it can be added to existing cells for increased coverage. The Metrocell provides a reduced power output for urban applications. The typical power output of the Power Amplifier (PA) is 22 watts (43.5 dBm).

Figure 1-1 shows the architecture of a DualMode Metrocell system and

Figure 1-2 is a block diagram of the product of the system.

DMS-MTX DualMode Metrocell Cell Site Description

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Nortel Networks 411-2021-111 manual Introduction, Northern Telecoms DualMode Metrocell

Contents

DualMode Metrocell Page Page June Publication history Contents Cell Site Components Power and Grounding RequirementsDatafilling a Metro Cell Site Appendices List of tables Block diagram of a 120 Stsr Metrocell using one RF FramePage Intended audience for this publication About this document Applicability of this publication How this publication is organized Carrier RF List of termsBand DBm CellDBW Duplexer Forward path FilterIsolation Loss Omni ModulationDqpsk Return loss Sectorization Signal RFSector Stsr Northern Telecoms DualMode Metrocell Introduction Digital ready cellular product System architecture of a DualMode Metrocell Metro RF Frame Basic components of a DualMode Metrocell Universal CE Frame Channel assignment Band a 416 channels Band B 416 channels 800 MHz cellular bandChannel assignment for 800 MHz cellular systems Introduction 6Introduction Standard 01.01 June Overview Cell Site ConfigurationsOmni configuration Omni N=7 frequency reuse plan Sectorized configuration 120 N=7 sectorized frequency reuse plan 60 N=4 sectorized frequency reuse plan Cell Site Layouts Omni cell site configuration RF Frame Control Channel redundancy Cell Site Layouts 4Cell Site Layouts TRU/DPA Transmit cabling 6Cell Site Layouts Component requirement Receive cablingNo. Frames TRUs ATCs Stsr cell site configuration CE Frame RF Frame Block diagram of a 120 Stsr Metrocell using one RF Frame Block 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 Y Sector Y TX/RX, 3 RX Control Channel Locate Channel Receiver Sector Stsr cell site connectionSector U Sector W 22Cell 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 Components NTAX98AA FRU Customer Service Operations 4Cell Site Components Standard 01.01 June Safety requirements Power and Grounding Requirements Power and grounding requirements Power and Grounding Requirements 4Power and Grounding Requirements Power distribution for the CE and RF Frames in a Metrocell Frame power distribution Grounding UL/CSA approval System power protection CEC par DC coupled signals Cable Identification 10Power and Grounding Requirements Standard 01.01 June Datafill Overview Datafilling a Metro Cell Site Table Acualm Table Clli Cavities Fan Pwr Alarm PointsMetro RF Frame ATC Hsmo +27V a Port # Rip Connector J206Table VCHINV, CCHINV, Lcrinv Example of Metro TRU datafill Frequency Assignment Example Icrm Example of Metro ICRM/TRU hardwire configuration 8Datafilling a Metro Cell Site Standard 01.01 June Radio Frequency Appendix a DualMode Metrocell Cell Site SpecificationsSystem Configuration Audio Interface Alarms Mechanical DC Power RequirementsPower Distribution Requirements Environmental Packaging Telecom Compliance Regulatory Electromagnetic EmissionsRadiated Emissions 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 a 10Frequency Plans Standard 01.01 June Page Cell Site Description