Nortel Networks 411-2021-111 manual Stsr cell site connection, Sector U, Sector W

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Cell Site Layouts 3-21

60° STSR cell site connection

The Metrocell in a 60° STSR configuration uses at least three equipment frames, one CE Frame and two RF frames (see Figure 3-8). Each TRU/DPA Shelf and its associated ATC on one of the two RF frames support one of the six sectors. With only two RF frames, the maximum number of Voice Channels (VCH) supported by each sector is six since two of the eight TRUs on the TRU shelf have to be assigned as the Control Channel (CCH) and the Locate Channel Receiver (LCR). A 60° STSR Metrocell with two RF Frames requires twelve antennas; one TX/RX antenna and one RX only antenna for each sector (see Figure 3-10). As traffic grows, two additional RF frames can be added to accommodate more VCHs per sector (see Figure 3-9).

A 60° STSR Metrocell with four RF Frames has 16 channels for one sector (including the CCH and the LCR) and each sector requires two TRU/DPA shelves and two ATCs. It also requires twelve antennas; one TX/RX antenna and one RX only antenna for each sector. The outputs of the two ATCs for each sector are combined through one phasing transformer and connected to a duplexer. The output of duplexer is then connected to the main TX/RX Antenna of that sector. The diversity RX antenna of each sector is connected directly to the Receive Multicoupler (RMC) of that sector. Figure 3-9 shows the frame layout and Figure 3-11 shows the block diagram of a 60° STSR Metrocell with four RF Frames.

Control Channel redundancy

Control Channel (CCH) redundancy is commonly provided with a Locate Channel Receiver (LCR) backup. With two RF Frames, the CCH of each sector is assigned to position 1 on the TRU/DPA Shelf of that sector and the LCR is assigned to position 4 on the same shelf. With four RF Frames, a typical assignment of the CCH and LCR for each sector is listed below:

 

Control Channel

Locate Channel Receiver

 

 

 

Sector X

RF Frame 1/TRU Shelf 1/Position 1

RF Frame 1/TRU Shelf 1/Position 4

 

 

 

Sector Y

RF Frame 2/TRU Shelf 1/Position 1

RF Frame 2/TRU Shelf 1/Position 4

 

 

 

Sector Z

RF Frame 2/TRU Shelf 3/Position 1

RF Frame 2/TRU Shelf 3/Position 4

 

 

 

Sector U

RF Frame 3/TRU Shelf 1/Position 1

RF Frame 3/TRU Shelf 1/Position 4

 

 

 

Sector V

RF Frame 4/TRU Shelf 1/Position 1

RF Frame 4/TRU Shelf 1/Position 4

 

 

 

Sector W

RF Frame 3/TRU Shelf 3/Position 1

RF Frame 3/TRU Shelf 3/Position 4

 

 

 

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.

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 organizedCarrier RF List of termsBand Duplexer CellDBm DBWLoss FilterForward path IsolationReturn loss ModulationOmni DqpskSectorization Signal RFSector 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 FrameChannel 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 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 ClliCavities Fan Pwr Alarm PointsMetro RF Frame ATC Hsmo +27V a Port # Rip Connector J206Table VCHINV, CCHINV, Lcrinv Example of Metro TRU datafill Frequency Assignment ExampleIcrm Example of Metro ICRM/TRU hardwire configuration8Datafilling a Metro Cell Site Standard 01.01 June Radio Frequency Appendix a DualMode Metrocell Cell Site SpecificationsSystem Configuration Audio Interface AlarmsMechanical DC Power RequirementsPower Distribution Requirements Environmental PackagingTelecom 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 a10Frequency Plans Standard 01.01 June Page Cell Site Description
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