Nortel Networks 411-2021-111 manual Control Channel redundancy, RF Frame

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3-2Cell Site Layouts

(ATC 1 and ATC 2) are combined through one phasing transformer (located at ATC 2) and then connected to Duplexer position 2 and the main TX/RX Antenna. The output of the upper ATC (ATC 3) is connected to Duplexer position 3 and the diversity TX/RX Antenna. This arrangement is used to meet the requirement of a minimum of 21 channel spacing (630 kHz) between the channels in one RF Frame. This configuration requires a TX/RX antenna to perform the diversity receive function of the cell. See Figure 3-3.

Control Channel redundancy

Control Channel (CCH) redundancy is commonly provided with a Locate Channel Receiver (LCR) backup. The CCH is assigned to position 1 on the TRU/DPA Shelf 1 and the LCR is assigned to position 4 on the same shelf. This arrangement will have the CCH and the LCR supplied on a different DC power feed and a TCM card. No RF coaxial switch is required since the cavity of the LCR position on the ATC will tune to the CCH frequency when backup is required.

Figure 3-1

Frame layout of an omni Metrocell with one RF frame (front view)

CE Frame

CE RIP

DRUM

ACU

HSMO

CSM2

RMC 1

Blank Panel

ICRM

Blank Panel

Base

RF Frame 1

RF RIP

Duplexer Duplexer Duplexer

Position 3 Position 2 Position 1

 

 

ATC 3

 

 

 

 

 

 

 

 

 

 

 

21

22

DPA

DPA

23

24

 

17TRU

18TRU

19TRU

20TRU

TRU/DPA

11

 

12

 

 

 

 

 

TRU

TRU

DPA

DPA

TRU

TRU

Shelf 3

9

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ATC 2

 

 

 

 

 

 

 

 

 

 

 

13

14

DPA

DPA

15

16

 

TRU9TRU

10TRUTRU

11TRUTRU

12TRUTRU

 

7

 

8

TRU/DPA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DPA

DPA

 

 

Shelf 2

 

 

5

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

ATC 1

 

 

 

 

 

 

 

 

 

 

 

5

6

DPA

DPA

7

8

 

TRU

TRU

TRU

TRU

TRU/DPA

3

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

Shelf 1

1

2

DPA

DPA

3

4

TRU

TRU

1

 

2

TRU

TRU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Base

Note: For a frame with up to 20 channels, only one duplexer (located in position 2) is required.

For a frame with 21 channels or more, two duplexers (located in positions 2 and 3) are required.

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 publicationBand List of termsCarrier RF Cell DBmDBW DuplexerFilter Forward pathIsolation LossModulation OmniDqpsk Return lossSector Signal RFSectorization 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 FrameChannel assignment for 800 MHz cellular systems 800 MHz cellular bandChannel assignment Band a 416 channels Band B 416 channels Introduction 6Introduction Standard 01.01 June Omni configuration Cell Site ConfigurationsOverview 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 AcualmMetro RF Frame ATC Alarm PointsCavities Fan Pwr Hsmo +27V a Table VCHINV, CCHINV, Lcrinv Rip Connector J206Port # Frequency Assignment Example Example of Metro TRU datafillExample of Metro ICRM/TRU hardwire configuration Icrm8Datafilling a Metro Cell Site Standard 01.01 June System Configuration Appendix a DualMode Metrocell Cell Site SpecificationsRadio Frequency Alarms Audio InterfacePower Distribution Requirements DC Power RequirementsMechanical Packaging EnvironmentalRadiated Emissions Regulatory Electromagnetic 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
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