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Information

Base Station System

Technical Description (TED:BSS)BS-240/241 II

A30808-X3247-K22-1-7618

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InformationBase Station System

!Important Notice on Product Safety

DANGER - RISK OF ELECTRICAL SHOCK OR DEATH - FOLLOW ALL INSTALLATION INSTRUCTIONS.

The system complies with the standard EN 60950 / IEC 60950. All equipment connected to the system must

comply with the applicable safety standards.

Hazardous voltages arepresent at the AC power supply lines in this electrical equipment. Some components may

also have high operating temperatures.

Failure to observe and follow all installation and safety instructions can result in serious personal injury

or property damage.

Therefore, only trained and qualified personnel may install and maintain the system.

The same text in German:

Wichtiger Hinweis zur ProduktsicherheitLEBENSGEFAHR - BEACHTEN SIE ALLE INSTALLATIONSHINWEISE.

Das System entspricht den Anforderungen der EN 60950 / IEC 60950. Alle an das System angeschlossenen

Gerte mssen die zutreffenden Sicherheitsbestimmungen erfllen.

In diesen Anlagen stehen die Netzversorgungsleitungen unter gefhrlicher Spannung. Einige Komponenten

knnen auch eine hohe Betriebstemperatur aufweisen.

Nichtbeachtung der Installations- und Sicherheitshinweise kann zu schweren Krperverletzungen oder

Sachschden fhren.

Deshalb darf nur geschultes und qualifiziertes Personal das System installieren und warten.

Caution:

This equipment has been tested and found to comply with EN 301489. Its class of conformity is defined in table

A30808-X3247-X910-*-7618, which is shipped with each product. This class also corresponds to the limits for aClass A digital device, pursuant to part 15 of the FCC Rules.These limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment.This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accor-

dance with the relevant standards referenced in the manual Guide to Documentation, may cause harmful inter-ference to radio communications.For system installations it is strictly required to choose all installation sites according to national and local require-

ments concerning construction rules and static load capacities of buildings and roofs.Forall sites, in particular in residential areas it is mandatory to observe all respectively applicableelectromagneticfield / force (EMF) limits. Otherwise harmful personal interference is possible.

Trademarks:

All designations used in this document can be trademarks, the use of which by third parties for theirown purposes

could violate the rights of their owners.

Copyright (C) Siemens AG 2002.

Issued by the Information and Communication Mobile Group

Hofmannstrae 51

D-81359 Mnchen

Technical modifications possible.

Technical specifications and features are binding only insofar as

they are specifically and expressly agreed upon in a written contract.

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Reason for Update

Summary:

First edition for release BR 5.5 and BR6.0

Details:

Chapter/Section Reason for Update

Issue History

Issue

Number

Date of issue Reason for Update

1 11/2002 First edition for release BR 5.5 and BR6.0

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This document consists of a total of 78 pages. All pages are issue 1.

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.2 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2 Hardware architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1 Board redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.1.1 AC/DC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.1.2 Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2 Nominal power amplifier output level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.2.1 Carrier Unit (CU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.2.2 Edge Carrier Unit (ECU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3 Rack configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192.4 Enhanced Observed Time Difference (E-OTD) . . . . . . . . . . . . . . . . . . . . . 24

2.4.1 Logical Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.4.2 LMU Interconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3 Modules Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.1 Core (COBA and COSA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.1.1 Core Basis (COBA2P8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.1.2 Core Satellite (COSA6P16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.2 Carrier Unit (CU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.3 Edge Carrier Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383.3.2 Mechanics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.3 Transmitter Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.4 Receiver Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.5 Local Test Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.6 Supported frequency range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.7 Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.8 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.9 Functional structure of the EDGE Carrier Unit. . . . . . . . . . . . . . . . . . . . . . 41

3.3.10 Main differences between ECU and CU . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.3.11 EDGE Power Amplifier and Tranceiver Unit(EPATRX) . . . . . . . . . . . . . . . 42

3.3.12 Signal processing unit (ESIPRO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433.3.13 EPSU (Power Supply Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.4 Duplexer Amplifier Multi Coupler (DUAMCO) . . . . . . . . . . . . . . . . . . . . . . . 45

3.5 DI(=2) Amplifier Multi Coupler (DIAMCO) . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.6 Filter Combiner (FICOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.7 Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.8 High Power Duplexer Unit (HPDU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.9 DC Panel (DCP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.10 DC Link Equipment Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.11 Alarm Collection Terminal (ACT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3.12 AC/DC converter (ACDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

3.12.1 DC and Battery Controller (DCBCTRL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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Technical Description(TED:BSS)BS-240/241 II


3.13 Overvoltage Protection and Tracer (OVPT). . . . . . . . . . . . . . . . . . . . . . . . . 50

3.14 Abis Link Equipment (LE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

3.15 Cover parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

3.16 Backup Battery (BATTERY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513.17 FAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

3.18 Heater Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4 Antenna combiners and receiving paths . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.1 Methods of combining. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.1.1 Typical combiner losses (Tx path) and output power level . . . . . . . . . . . . . 62

4.1.2 Parameters of Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . . 63

4.1.3 Examples of possible BTSE configurations . . . . . . . . . . . . . . . . . . . . . . . . . 65

4.2 Receiving paths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4.2.1 Antenna diversity techniques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4.2.1.1 Antenna System Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4.2.2 Receiver sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3 Transmit Diversity/Antenna Hopping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3.2 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

4.3.3 CU-Pools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

4.3.4 Algorithm for TX Diversity/Antenna Hopping. . . . . . . . . . . . . . . . . . . . . . . . 72

5 Power supply and battery backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.1 Support of emergency operation for 3rd party BBU system. . . . . . . . . . . . . 75

6 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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Illustrations

Fig. 2.1 BS-240 II indoor Cabinet (Base Rack). . . . . . . . . . . . . . . . . . . . . . . . . . 14

Fig. 2.2 Units and modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Fig. 2.3 Redundant COREs and their interfaces. . . . . . . . . . . . . . . . . . . . . . . . . 17

Fig. 2.4 BS-240 base rack and 2 extension racks . . . . . . . . . . . . . . . . . . . . . . . 20

Fig. 2.5 BS-241 base rack and 2 extension racks . . . . . . . . . . . . . . . . . . . . . . . 21

Fig. 2.6 Possible configuration of Service1-Rack . . . . . . . . . . . . . . . . . . . . . . . . 22

Fig. 2.7 Possible configuration of Service2-Rack . . . . . . . . . . . . . . . . . . . . . . . . 23

Fig. 2.8 BS-240/241 II fully equipped with 24 carriers . . . . . . . . . . . . . . . . . . . . 24

Fig. 2.9 E-OTD Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Fig. 2.10 LCS Logical Reference Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Fig. 2.11 LMU Connection to BTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Fig. 3.1 Backplane slot configuration of core. . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Fig. 3.2 COBA2P8 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Fig. 3.3 Structure of ACLK function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Fig. 3.4 COSA6P16 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Fig. 3.5 Carrier unit block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Fig. 3.6 PATRX block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Fig. 3.7 Principal data flow on SIPRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Fig. 3.8 Position of the ECU and CU in the BTS. . . . . . . . . . . . . . . . . . . . . . . . . 39

Fig. 3.9 Epatrix and Esipro function block diagram.. . . . . . . . . . . . . . . . . . . . . . 41

Fig. 3.10 EPATRIX INTERFACES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Fig. 3.11 Data flow in ESIPRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Fig. 3.12 Alarm collection terminal (ACTM and ACTP). . . . . . . . . . . . . . . . . . . . . 49

Fig. 3.13 Example of battery backup systems connected to the AC/DC . . . . . . . 51

Fig. 4.1 Overview of combining options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Fig. 4.2 DUAMCO 2:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Fig. 4.3 DUAMCO 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Fig. 4.4 DUAMCO 8:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Fig. 4.5 FICOM 8:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Fig. 4.6 DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Fig. 4.7 HPDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Fig. 4.8 Configuration with HPDU, DUBIAS and TMA. . . . . . . . . . . . . . . . . . . . 61

Fig. 4.9 Multi-cell (3,3,2): with 3 DUAMCO 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Fig. 4.10 Multi-cell (3,3,2): with 2 DUAMCO 4:2 and 1 DUAMCO 2:2. . . . . . . . . 66

Fig. 4.11 Single-cell (8,0,0): with FICOM and DIAMCO. . . . . . . . . . . . . . . . . . . . 66

Fig. 4.12 Single-cell (8,0,0): with 2 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . 67

Fig. 4.13 Multi-cell (2,2,2): with 3 DUAMCO 2:2. . . . . . . . . . . . . . . . . . . . . . . . . . 67

Fig. 4.14 Single-cell (11...16,0,0): FICOMs, DIAMCOs and HPDUs in 2 racks. . 68

Fig. 4.15 Initial Data Structure Necessary For Proposed Algorithm . . . . . . . . . . . 74

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Tables

Tab. 1.1 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Tab. 1.2 Frequency bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Tab. 2.1 Nominal Power Amplifier Output Level (CU). . . . . . . . . . . . . . . . . . . . . . 18

Tab. 2.2 Nominal Power Amplifier Output Level (ECU) . . . . . . . . . . . . . . . . . . . . 19

Tab. 3.1 Units and modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Tab. 3.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Tab. 4.1 Insertion loss of DUAMCOs, FICOMs, HPDU and TMA. . . . . . . . . . . . . 62

Tab. 4.2 S22 of the GSM and DCS/PCS FICOMs. . . . . . . . . . . . . . . . . . . . . . . . 62

Tab. 4.3 Parameters of 900 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . . 63

Tab. 4.4 Parameters of 1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . 64

Tab. 4.5 Parameters of 900/1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . 65

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1 IntroductionThis manual is common for both BR5.5 and BR6.0 releases. Below are listed the

features not supported in BR5.5 line:

Enhanced Observed Time Difference features

Edge Carrier Unit

Transmit Diversity/Antenna Hopping

850 MHz frequency

The BS-240/241 II is an evolution of the existing BSS products. Some modifications

have been introduced in the mechanical which represents the latest state of technology.

The RF performance of the BTSs is not affected by the modifications.The architecture

of BS-240/241 II provides maximum flexibility to develop higher capacity BTSs with

reduced volume and an expanded number of 24 TRXs in 3 racks with a modularity of 8

TRXs per rack. The provision of a full spectrum of combining equipment allows high

power and minimized number of antennae. High receiver sensitivity is also guaranteed.

The BS-240/241 II primarily consists of:

carrier oriented boards called carrier unit (CU),

core boards (COSA/COBA) and

combining equipment

The carrier unit(s) provide all analog and digital signal processing including an RF power

stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter-

face with the combining equipment on the one side and with the core modules on the

other.The core boards provide functions common to all carriers within the BS-240/241 II

(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different

carriers.

Up to 8 PCM lines can be connected to the core boards. In order to provide cost effectivesolutions for small and large BTSs, the core boards are scalable (COBA, /COSA). In

addition, the BS-240/241 II itself is scalable. It is possible to connect up to 2 extension

racks to a base rack.

The primary communication between the modules is provided by means of bi-directional

serial link communications between the carrier units (CU) and the core boards. The

serial link also provides an effective means to realize baseband frequency hopping.

Despite the fact that synchronization information is transported via the serial links, no

differential length constraints apply for the lines of the serial link.

All alarms, except the alarms generated in the core and in the CU boards, are trans-

ported via the CAN bus. Alarms of the CU boards are transmitted via CC-Link. Core

boards use their interface bus.

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1.1 Main features

The BS-240/241 II is designed for max. 24 carriers in 3 racks/shelters plus service

racks/shelters, if needed. The minimum configuration is one rack or one shelter with a

service shelter. Service racks/shelters can be configured to accommodate BackupBatteries and Link Equipment. A service rack/shelter can be equipped with AC/DC

Converters. Easy rack/shelter extension is possible with one or two Extension

Racks/Shelters.

The BS-240/241 II can be configured for the systems D850, D900, D1800 and D1900

with the following configurations:

Dual band: D900/D1800, D900/D1900, D850/D1800 and D850/D1900

GSM-DCS cell

mixed cell configuration to enlarge GSM cells with DCS frequencies

Common BCCH channel for GSM-DCS cell (dual band)

Single cell

Multi cell

Up to 6 cells per rack and up to 12 cells can be supported. A special case is the feature

concentric cell; one cell with 2 supply areas (inner and complete area). This feature

can be used in omnicells as well as in multicells with sectors.

The following combining options are supported:

antenna combining with duplexers (DUAMCO) can be applied for 2, 4 and 8 carriers.

RF amplifier and multicoupler for the RX path are integrated

antenna combining with Filter Combiners (FICOM) is possible for up to 8 carriers

onto one TX antenna

cascading of multicoupler equipment (DIAMCO) is possible for up to 24 carriers

High Power Duplexer (HPDU) for reduction of the necessary numbers of antennas

in case of FICOM per cell for up to 8 carriers can be applied every BTSE has core equipment in the Base Rack/Shelter

sensitivity is better than GSM requirements at the rack entry by using DUAMCO or

DIAMCO units

BTSplus sensitivity is better than GSM requirements at the antenna connector by

using Tower Mounted Amplifiers (TMA)

EDGE Carrier Units (ECU)

Mixed Configurations of Cells/Sectors applying both EDGE Carrier Units (ECU) and

normal Carrier Units (CU)

Traffic Channels:

Full-Rate (FR)

Half-Rate (HR) Enhanced Full-Rate (EFR)

Adaptive Multi Rate Codec (AMR)

Services:

GPRS

HSCSD

Frequency Hopping:

Baseband

Synthesizer

Redundancy:

SW Support of Core Redundancy

SW Support of BCCH Redundancy

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AC/DC n+1 redundancy. (n+1) AC/DC Converters work in load sharing, but n AC/DC

are able to supply the whole BS-240/241 II including Service Racks/Shelters

Abis interface:

Enhanced Full-Rate TCH Full-Rate and Half-Rate TCH

submultiplexing 4 x 16 kbit/s onto one 64 kbit/s timeslot for handling Full-Rate TCH

on Um interface

handling of 4x(2x8) kbit/s onto one 64 kbit/s timeslot for half-rate TCH on Um inter-

face

drop and Insert feature on 2 Mbit/s and 1.5 Mbit/s (T1) links is available on a 16 kbit/s

and a 64 kbit/s basis

star, loop and multidrop chain connections

cross connect function

change of PCM line configuration from star to multidrop or loop and vice versa is

possible without any interruption of service

multiple Abis LAPD links; load sharing and LAPD fault recovery

external clock synchronization

over-voltage protection with OVPT (optional feature)

Abis link media:

wire

fiber optic

Wave

Fault procedures:

Automatic Recovery procedure of faulty objects in BTS

Online RF Loopback

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1.2 Technical data

The BS-240/241 II family with 24 transceivers can be supplied in the following versions:

A BS-240 for indoor installation.

A BS-241 for outdoor installation (also equipped with: integrated power supply,battery, microwave equipment, integrated link equipment, heat exchanger and cross

connector).

BS-240/241 II consist in a split BTS architecture, with:

- 1 base rack

- 2 extension racks

- up to 5 service racks (service1 or service2).

Characteristics BS-240 (indoor) BS-241 (outdoor)

Max. TRX per BTSE 24 24

(in more than one rack)Max. TRX per cell 24 24

(in more than one rack)

Dimensions (mm) (HxWxD) 1600x600x450 (53x2x16) 1750x700x650 (59x24x22)

(Base Racks) (incl. Plinth)

Volume net 432 l 705 l796 l (incl. Plinth)

Maximum power consumption 1600 W 1750 W

Weight of Basic Rack / Shelter ca. 66 kg (146 Lbs) ca. 66 kg (146 Lbs)

Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)- 1 Frame for Battery incl. 1Battery (48V / 85 Ah) (ca. 140 kg/309Lbs)- 1 Mounting Kit for Link Equipment incl. 1 Frame NTPM, Frame forFan Unit and two FAN's (ca. 16 kg/ 35 Lbs)- 1 Rack (ca. 66 kg/146 Lbs)SUM: ca. 249 kg (549 Lbs)

Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)- 1 Mounting Kit for Link Equipment incl. 2 Frame NTPM, Frame forFan Unit and two FAN's (ca. 21 kg/46 Lbs)- 1 Rack (ca. 66 kg/146 Lbs)SUM: ca. 114 kg (251 Lbs)

Weight of sub-racks: Sub-rack with Battery ca. 140 kg (309 Lbs)Sub-rack AC/DC with 6 AC/DC Modules ca. 27 kg (60 Lbs)Sub-rack with 4 CU's and 2 MUCO's ca. 40 kg (88 Lbs)Sub-rack with 4 ACOM's ca. 40 kg (88 Lbs)Rack (empty) ca. 66 kg (146 Lbs)Shelter (empty) ca. 27 kg (60 Lbs)1 HEX ca. 5.6 kg (12 Lbs)

Temperature range (C) -5 C to +55 C+23 F to +131 F

-45 C to +50 C-49 F to +122 F

Tab. 1.1 Technical data

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Frequency-Band Uplink (MHz) Downlink (MHz)

GSM 850 824.2 - 848.8 869.2 - 893.8

P-GSM 900 890.2 - 914.8 935.2 - 959.8

E-GSM 900 880.2 - 914.8 925.2 - 959.8

R-GSM 900 876.2 - 914.8 921.2 - 959.8

GSM-RE 900 876.2 - 901.0 921.2 - 946.0

DCS 1800 1710.2 -1784.8 1805.2 -1879.8

PCS 1900 1850.2 -1909.8 1930.2 -1989.8

Tab. 1.2 Frequency bands

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2 Hardware architectureThe BS-240/241 II is designed to achieve commonality of boards to serve both

GSM850/GSM900 with its different deviates (DCS1800/PCS1900) and standards

selected for mobile communication systems. Moreover, the architecture of

BS-240/241 II provides maximum flexibility to develop large and small BTSs which have

similar costs per TRX. Fig. 2.1shows the base rack cabinet.

Fig. 2.1 BS-240 II indoor Cabinet (Base Rack)

The BTS functional blocks of the BS-240/241 II are shown in Fig. 2.2

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Fig. 2.2 Units and modules

CU 7

CU 0

CU 7

Base Rack

Service Rack

DUAMCO CU 0

COSA

ACTM

CAN BUS

CC-Links

FICOM

DIAMCO

HPDU

4xTX

RX

RXDIV

4xTX

RX

RXDIV

ACTC ACTP

LE 0 LE 1

BATTERY

TMA

DCB-

ACP

CTRL

ACTC

FAN

Cell 0

Cell 1

FICOM

DIAMCO

4xTX

4xTX

RX

RXDIV

Cell 1

RX

RXDIV

RX

RXDIV

ACTC ACTP

FAN

to next ext. rack

RXCA1RXCA0

BATTERY

DCB-CTRL

AC/DCAC/DC

DCP

DCP

DCP

Extension Rack

Cascading

DUBIAS

COBA

2 PCM

Ext. Sync.

2 PCM

4 PCM

Abis

Sync.

Abis

TMA

FAN

TMA

TMA

OVPT

OVPT

* not present in case of BTSE with reduced number of fan

*

*

*

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The architecture of BS-240/241 II provides maximum flexibility to develop large and

small BTSs which have similar costs per TRX.

The BS-240/241 II mainly consists of:

carrier oriented boards called carrier unit (CU), core boards (COSA/COBA) and

combining equipment

Up to 8 PCM lines can be connected to the core boards. In order to provide cost effective

solutions for small and for large BTSs, the core boards are scalable (COBA, /COSA). In

addition, also the BTS itself is scalable. It is possible to connect up to 2 extension racks

to a base rack.

The main communication between the modules is provided by means of bi-directional

serial link communications between the carrier units (CU) and the core boards. The

serial link also provides an effective means to realize baseband frequency hopping.

Despite the fact that synchronization information is also transported via the serial links,

no differential length constraints apply for the lines of the serial link.

All alarms, beside the alarms that are generated in the core and in the CU boards, are

transported via the CAN bus. Alarms of the CU boards are transmitted via CC-Link. Core

boards use their interface bus.

The carrier unit(s) provide all analog and digital signal processing including a RF power

stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter-

face with the combining equipment on the one side and with the core modules on the

other. The core boards provide functions common to all carriers within the BS-240/241 II

(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different

carriers.

AC/DC AC/DC converter DCBCTRL DC and Battery Controller

ACP AC Panel DCP DC Panel

ACTC Alarm Collection Terminal Connection module DIAMCO DI(2) Amplifier Multi Coupler

ACTM Optional Alarm Collection Terminal for Master Rack DUAMCO Duplex Amplifier Multicoupler

ACTP Alarm Collection Terminal for Slave Rack FICOM Filter Combiner

CAN Controller Area Network HPDU High Power Duplexer

COBA Core Basis (COBA2P8) LE Link Equipment

COSA Core Satellite (COSA6P16) TMA Tower Mounted Amplifier

CU Carrier Unit

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2.1 Board redundancy

Redundancy in the SBS ensures survival of the system even in the event of multiple fail-

ures. Modular architecture, in conjunction with the concept of split functions, guarantees

maximum survivability with a minimum of additional hardware.

2.1.1 AC/DC

Up to 6 AC/DC converters (only one Frame) can be equipped in the service1 rack which

provide N+1 redundancy. AC/DC converters work in load sharing, but n AC/DC are able

to supply the whole BS-240/241 II .

.

2.1.2 Core

The Core can consist of up to 2 (without redundancy) or up to 4 (with redundancy)

boards, which have a common backplane. The block diagram depicts the 2n CORE

redundancy and the embedding of the active and the passive CORE into the BTS, and

the interrelation of both COREs.

Fig. 2.3 Redundant COREs and their interfaces

Both COREs (COBA0/COSA0 and COBA1/COSA1) have link interfaces to the ABIS

lines, but only one (the active CORE) can physically be connected.

On the backplane of the BTS, one connector provides a link of the LMT to the current

active CORE. In the case of a CORE switch over, the switch logic switches that

connector to the new active CORE. The same holds for the CAN bus (alarm bus), i.e.,

both COREs have the same CAN bus address where at any time at most one CORE is

an active CAN bus node.

Both the active and the passive CORE have links to the carrier units (CU); in reverse,

each CU is linked with both COREs. The traffic data are transmitted transparently

through the active CORE. Signal processing takes place only within the CUs.

CUSELIC

SELIC

BISON

RDInterf.

SwitchLogic

FALC

CORE 0CLK

Route Clock

Redundancy Link

Switch Logic Link

Route Clock

(Frame Sync)

ABISCAN

LMT

P

CUSELIC

CUSELIC

SELIC SELIC SELIC

BISON

RDInterf.

SwitchLogic

FALC

CORE 1CLK

Route Clock

P

SELICSELIC

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The endpoints of each link are built up by SELIC ASICs (note: one SELIC contains

double functionality), where on the CU, one SELIC serves two COREs. In the case of a

switch over, the SELICs on the active CORE are disabled by the switch logic and the

SELICs on the passive one are enabled. The SELICs on the CORE have to know

whether they are on the active or on the passive CORE. For this reason the SELICs

need a active/passive pin, which is served by the redundancy switch logic. When a

switch over occurs, the switch logic sets the active/passive pin of the former active

SELICs to "passive" and that of the former passive SELICs to "active".

The SELICs on the CUs have to recognize automatically which link comes from the

active CORE and which link from the passive one, i.e. it has to recognize a CORE switch

over by itself.

The RD interface (redundancy interface) is realized as a 2 Mbit/s HDLC link which

provides a communication interface between the two main processors (mP).

The switch logic is a flip-flop distributed over the two COREs. It manages the HW part

of a switch over and enables the COREs to know about their states as active/passive.

The ACLK of the active CORE is connected with the one on the passive CORE. It allows

the passive ACLK to be synchronized to the active one.

NOTE: the redundancy is implemented in a cold-standby mode, i.e., all calls will get lost

if a CORE switch over occurs.

2.2 Nominal power amplifier output level

2.2.1 Carrier Unit (CU)

D900 output powerat PA output



60 Watt 40 Watt 40 Watt

Tab. 2.1 Nominal Power Amplifier Output Level (CU)

iGSM: minimum guaranteed output power CU = 50 Watt tolerance value: 47.0 dBm -47.6 dBm (50 W - 57.5 W) DCS/PCS: minimum guaranteed output power CU = 34 Watttolerance value: 45.3 dBm - 46.0 dBm (34 W - 39.5 W).The mentioned data are guaranteed form Module Factory Test only. The typical outputpower at CU output is for:GSM: 47,3 dBm DCS: 45.7 dBmTo verify the typical output power values in field measurements, the tolerance value ofthe used measurement equipment, environmental conditions and GSM 05.05 specifica-tions have to be considered.

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2.2.2 Edge Carrier Unit (ECU)

2.3 Rack configurationThe BS-240/241 II family, with 8 transceivers per rack, which is expandable up to 24

transceivers in 3 racks and can be supplied in two versions:

a BS-240 for indoor installation, and

a BS-241 for outdoor installation (also equipped with integrated link equipment,

battery backup and a cooling system).

There are 4 different types of rack:

Base Rack/Shelter (with Core modules)

Extension Rack/Shelter (for more then 8 CUs)

Service1 Rack/Shelter (with AC/DC modules)

Service2 Rack/Shelter (for LE and batteries)

It is possible to connect up to 3 Racks/Shelters together (1 Base Rack, 2 Extension

Racks; the more possible racks/shelters called Service Rack/Shelter are not part of a

Rack Extension in the proprietary sense) that realizes then the performance of a 24 TRX

BTSE as shown in Fig. 2.4and Fig. 2.5:

D850/D900 output power

at PA output

D1800 output power

at PA output

D1900 output power

at PA output

70 Watt GMSK44 Watt 8PSK



Tab. 2.2 Nominal Power Amplifier Output Level (ECU)

iGSM: minimum guaranteed output power ECU = 63 Watt (GMSK) / 40 Watt (8PSK).DCS/PCS: minimum guaranteed output power ECU = 50 Watt (GMSK) / 32 Watt(8PSK).The mentioned data are guaranteed from Module Factory Test only.

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Fig. 2.4 BS-240 base rack and 2 extension racks

ACOM

0

ACOM

1

ACOM

2

ACOM

3

DC-PANEL

ACT-C

CU2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-240SIEMENS

ACOM

0

ACOM

1

ACOM

2

ACOM

3

CU2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-240SIEMENS

C

OBA

0

C

OSA

0

C

OBA

1

C

OSA

1

FAN 0 FAN 1

ACOM

0

ACOM

1

ACOM

2

ACOM

3

DC-PANEL

ACT-C

CU2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-240SIEMENS

FAN 0 FAN 1

DC-PANEL

ACT-C

FAN 0 FAN 1

FAN 2 FAN 3

FAN 4 * FAN 5*

FAN 2 FAN 3

FAN 4* FAN 5*

FAN 2 FAN 3

FAN 4* FAN 5*

* not present in case of BTSE with reduced number of fans

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Fig. 2.5 BS-241 base rack and 2 extension racks

Fig. 2.8 shows one of the possible configurations. The Base Rack and the Extension

Racks can be located physically in any position.

The Service Rack (see Fig. 2.6 and Fig. 2.7) satisfies various applications depending

on number of CU units configured and/or number and kind of Network termination equip-

ment provided and the Battery Backup time required.

CU2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-241SIEMENS

COBA

0

COSA

0

COBA

1

COSA

1

DC-PANEL

ACT-C

FAN 0 FAN 1

FAN 2 FAN 3

FAN 4* FAN 5*

ACOM

0

ACOM

1

ACOM

2

ACOM

3

CU2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-241SIEMENS

DC-PANELACT-C

FAN 0 FAN 1

FAN 2 FAN 3

FAN 4* FAN 5*

ACOM

0

ACOM

1

ACOM

2

ACOM

3

CU

2

CU

3

CU

6

CU

7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-241SIEMENS

DC-PANELACT-C

FAN 0 FAN 1

FAN 2 FAN 3

FAN 4* FAN 5*

ACOM

0

ACOM

1

ACOM

2

ACOM

3

* not present in case of BTSE with reduced number of fans

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Fig. 2.6 Possible configuration of Service1-Rack

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Fig. 2.7 Possible configuration of Service2-Rack

On the digital side there is an extension of the CC links (connection between Core Back-

plane and the CUs not housed in the Base Rack) and the CAN Bus. The CAN Bus

connection cannot be shown in the right way because it strongly depends on the number

of Extension and Service Racks present.

On the RF side there is an extension in the RX path only for omni and specific sector

cell (e.g., 5/5/5) configurations and diversity reception with more than 8 TRX. Thus amaximum of 2 RF cables (cascading) are connected between two racks. There is no TX

combining over rack borders thus the TRXs of different racks is combined on air only.

Some configurations are not possible with 2 racks only e.g., 5/5/5 with FICOM because

of the number of available ACOM slots.

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Fig. 2.8 BS-240/241 II fully equipped with 24 carriers

For the BS-241 II outdoor cabinet only one type of the Shelter exists to be used for all

outdoor Base Shelter, Extension Shelters, Service1 and Service2 Shelters.

2.4 Enhanced Observed Time Difference (E-OTD)

In the GSM Location using an E-OTD Service, the LMUs (Location Measurement Unit)

are used to provide timing measurements of broadcast channel synchronization frames

(SCH). This is used within an E-OTD Service to provide location measurements for an

E-OTD equipped mobile station (MS).

In the E-OTD positioning method, the LMU measures the relative time of arrival of thesignals from several BTSs. The position of the MS is determined by deducing the

geometrical components of the time delays to an MS from the BTS. The Siemens LMU

measures real-time differences between synchronization bursts of BTS pairs. The accu-

racy of the location estimate depends on the MS being able to receive signals from a

sufficient number of BTSs whose timing is known.

An E-OTD location service works as follows:

The MS takes measurements of the time differences between the SCH of at least

three received BCCH. If it can see more than three BCCHs, it should take additional

measurements, as these will improve the accuracy of the result.

Extension Rack

Base Rack

Service1 Rack

Service2 Rack

Extension Rack

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communicate with the PLMN via a fixed, wired interface. Two potential interfaces are

provided, a CAN interface or a high speed serial interface.

The Siemens Type B LMU is a dual band unit operating over the GSM850 BCCH band

and the PCS1900 BCCH band.To improve measurement accuracy and allow for expendability, the LMU includes a

GPS receiver based on the SiRF chip set. Serial output of the GPS data can be enabled,

and a 1 PPS, TTL level signal is provided. The recommended GPS antenna for co-

located installation is the Trimble Bullet III. This has high immunity to jamming and

allows for both easier installation and less disruption of the GPS service.

For location services, the LMU sends and receives LLP messages compliant with the

ETSI standard, GSM 04.71.

2.4.1 Logical Architecture

The figure below shows the components of interest for the SMLC within the LCS logicalarchitecture. Siemens has adopted a BSS centric architecture for its LCS.

Fig. 2.10 LCS Logical Reference Architecture

LCS components of interest for the SMLC and their LCS-related functionalists:

BSC (Base Station Controller)

The BSC receives a location request for a particular MS from an LCS client via the

GMLC and MSC. It may append additional information and forward the request to a

BSS-based SMLC. It also transfers positioning related messages between the SMLC,

the target MS, and LMU. The BSC forwards the location response received from the

SMLC to the GMLC via the MSC.

BTS (Base Transceiver Station)

The BTS provides the radio interface to the MS.

GMLC (Gateway Mobile Location Center)

The GMLC provides external LCS clients with access to the GSM PLMN and its locationservice. There can be several GMLCs in one PLMN. The GMLC stores LCS subscription

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information on a per-LCS-client basis. It uses this information when receiving an LCS

request to identify the requesting LCS client and to authorize it to use the specified

request

LMU (Location Measurement Unit)

The LMU makes the radio measurements needed by different positioning methods and

supplies the data to the SMLC associated with it. The radio measurements can be

specific to one MS (location measurements) or specific to all MSs in a certain

geographic area (assistance measurements).

MSC/VLR (Mobile Switching Center/Visitor Location Registry)

With a BSS based SMLC, the MSC relays location requests and responses between the

GMLC and the BSC serving the MS to be located.

SMLC (Serving Mobile Location Center)The SMLC manages the overall coordination and scheduling of resources required to

position MSs in a PLMN. There may be more than one SMLC in one PLMN. The BSS-

based variant receives location requests from its associated BSCs. It determines the

positioning method to be used based on the QoS, the capabilities of the network, and

the MSs location capabilities. It can instigate location-related measurements in the MS

itself or in separate LMUs. The SMLC calculates the final location estimate and accu-

racy and returns it in a location response to the requesting BSC.

LCS Client

The LCS client provides location dependent services to the MS subscriber. It represents

a location application.

MS (Mobile Station)

The MS is the target to be located. For MS-assisted and MS-based positioning methods,

it generates additional measurement data or even calculates the location itself.

2.4.2 LMU Interconnection

The LMU module is controlled over the BTS CAN bus. The CAN bus will support LLP

messages, for the support of LCS, and O&M functions.

The LMU module is connected to external antennas and to the test signal ports of any

DUAMCOs, etc, that carry BCCH sniffer signals for the collocated BTS, as shown inFigure 2.10

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Fig. 2.11 LMU Connection to BTS

The LMU module is provisioned for the connection of two external GSM antennas. The

provisions for the use of a second antenna will cover those situations were a single

antenna would not acceptably receive all of the desired BCCH signals.

The LMU module is provisioned for the connection of an external GPS antenna.The LMU module is provisioned for the connection of three sniffer signals, one for each

sector. When multiple sniffer signals need to be combined then all of those serving a

particular sector will be combined into a single feeder cable using resistive combiners.

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3 Modules Description

iIn Tab. 3.1"x" indicates the frequency range: G =GSM, D =DCS, P = PCS

Name Freq.Var.

Remarks

Core modules:COBACOSA

Core basisCore satellite

no Up to 8 PCM lines with COBA and COSAequipped (COBA and COSA can beequipped only in the base rack/shelter).

Carrier related modules:CUxECUx

Carrier unit yes Carrier unit and edge carrier unit can beequipped only in the base and extensionracks/shelters (see also section 2.2)

Antenna system modules:DUAMCO2xDUAMCO4xDUAMCO8xDIAMCOxFICOMBxFICOMXxTMAxHPDUx

Duplexer 2:2Duplexer 4:2Duplexer 8:2Diversity multi couplerFilter combiner (base)Filter combiner (extension)Tower mounted amplifierHigh power duplexer

yes Antenna system modules can beequipped only in the base and extensionracks/shelters.DIAMCO, FICOM and HPDU are notavailable for the PCS band.DUAMCO 2:2, DUAMCO 4:2 and HPDUworking in shifted primary GSM band areavailable.A Diplexer can be used in all caseswhere GSM900 and DCS1800/PCS1900or GSM850 and DCS1800/PCS1900Feeder Cables have to be installed inparallel.

Alarm collection modules:ACTC (part of DC-Panel)ACTMACTP

Alarm collection terminals no ACTC is equipped in every rack/shelter.ACTM can be equipped only in the baserack/shelter. ACTP can be equipped inthe extension or service racks/shelters.

Power supply modules:ACDCDCBCTRL

ACDC converterDC battery controller

no ACDC controller used for AC power andsupervision of the ACDC converter canbe equipped only in the serviceracks/shelters.

OVPTOVPTCOAX

Over voltage protectionand tracer

no 100 / 120 symmetric line75 coaxial asymmetric line. The OVTPis an optional feature.

Abis Link Equipment:LE

Link Equipment no Link Equipment can be equipped only inservice1 and service2 racks/shelters

Tab. 3.1 Units and modules

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Fig. 3.1 Backplane slot configuration of core

For a configuration with less or equal 2 PCM30/24-interfaces and no Extension Rack

one COBA-board is required. The second slot can be used for an expansion of the BTSE

up to 8 Abis- and 24 CU-interfaces or it can be used for future expansions, e.g. a

GPS-Receiver for synchronization, better frequency-standards or other Abis-interfaces

than PCM30/24 (e.g., SDH, ATM).

The connection of the Abis- and CU-interfaces of the Core to the OVPT/Abis-interface

and the CUs is done via cables, which are plugged into the backplane.

The CU-interfaces of the Core and its redundancy are routed with separated wires via

the backplane and cables to the CUs (2 interfaces on one CU required).

The Abis-interface-ports of the Core and its redundancy-ports can only be switched to

the same wires. Only one transceiver at the same time is allowed to be switched to the

same wires (no simultaneous transmitting/receiving of Core and its redundancy on the

same Abis-port possible).

To find the physical place of a Abis-interface/CU out of the logical/memory-map

address, appropriate configuration-rules are created and considered!

Two Core-boards, COBA2P8 (see section 3.1.1) and COSA6P16 (see section 3.1.2),

are developed. The first digit gives the number of Abis-Interfaces, the following letter the

kind of Abis-interface (e.g. P for PCM30/24), and the following number the number of

CU-interfaces, e.g., COSA6P16 (6 PCM30/24 Abis-interfaces, 16 CU interfaces).

Hot Plug-in: A Hot Plug-in of the Core-boards (COBA and COSA) is possible. This

means that these boards can be plugged in/out with voltage switched on and no other

HW inside of the rack is disturbed (no loss of data on other boards) or a board is

destroyed.

CABLE

2 Abis 6 Abis

COBA COSA COBA red. COSA red.

2 Abis 6 Abis

Abis

8 CU 16 CU 8 CU 16 CU other

interfaces

Backplane Plugs

Extension

CUs

CUOVPT Rack

iA COBA-board can only be pulled out, if before the COSA-board is pulled out

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After plug-in of a Core-board, this board is in the reset-state and all bus-drivers of

external busses are in tristate. These drivers will be enabled not before initialization of

the devices, which serve the external busses (e.g., BISONs, SELICs).

3.1.1 Core Basis (COBA2P8)

The COBA is the central board of the core. The functionality of the advanced clock

generation (ACLK) and the base core controller (BCC) of the entire BTSE are inte-

grated. Additionally two PCM30/24 Abis-interfaces are available on the COBA2P8.

The controller maintains the SW of all BTSE units in FLASH-EPROMs, supervises the

SW download and terminates all internal system alarms. Beside the O&M functions, the

controller handles the signalling messages between the BSC (Abis) and CUs (CC-Link).

For interface and feature extensions the COBA can be expanded with one satellite

(COSA).

To fulfill the CORE redundancy aspects, the COBA board with its satellite COSA board

can be duplicated. In this case, one CORE (COBA+COSA) is "providing service" and

works as the master and the other CORE is "cold standby" or is "disabled" if HW prob-

lems have occurred. The redundancy switch is controlled by the COBA board. Special

links are provided for information exchange between the two board sets.

Fig. 3.2 COBA2P8 block diagram

The ACLK generates the system specific timing signals that are distributed by the

SELIC2s to the CUs. Fig. 3.3shows the structure of the ACLK function.

SMC2

SMC1

SMC4

SMC3

SMC2

TSA-SCC1SIU

BCC

MPC860MH

SESA

OASI

RDL

TPC

LMT/OTP

LAPD

ACLK

SELIC

SELIC

SELIC

SELIC

CUCU

CUCUCUCU

CU

CU

SELIC-BUS

Abis1

Abis2

BISON-BUS

SA

T-Interface

DC/DC Converter

SRAM16MB

FLASH3 X 8MB

CAN I/OBISON

RDLLOGIC WATCHDOGEEPROMsA/D-Conv. MUX

CAN-BUS, ALARMs LEDs, Redundancy Control,CU_DC_OFF ect.

Route clock

ext CLK sync

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Fig. 3.3 Structure of ACLK function

The tracking oscillator TOP synchronizes the oven controlled VCXO to the selected

frequency reference source. The TOP is realized as a phase/frequency locked loop. The

regulation parameters (P and I constant) are variable by SW. The regulating algorithm

is also implemented by SW. The output clock of the oscillator is called the master clock.The cut-off frequency of the TOP depends directly on the pulling gradient of the used

OCVCXO. Since the ACLK must synchronize to jittered lines, the scattering of the cut-off

frequency is very critical. The cut-off frequency must choose very low to eliminate lowest

frequency wander and is therefore near the range of the temperatures cut-off

frequency. To guarantee less deviation of the required cut-off frequency, also with

components from different manufactures (2nd and 3rd source), the OCVCXO is cali-

brated on the COBA in the factory. The pulling gradient is measured against an atomic

clock and the calibration values are stored on the COBA in a serial EEPROM. Uncali-

brated ACLKs must not work in the field. This can be achieved by the software, which

should check whether or not the ACLK is calibrated.

The clock line of the current select so synchronization source is also linked to the redun-dant ACLK function, which may also track this frequency. For redundancy switch-overs,

no warm up and only a short synchronization phase (because of the effects at the

switch-over) of the redundant ACLK is necessary.

The loadable timing generation hardware LTG is implemented in a FPGA device, which

can be loaded by the BCC with the current hardware function. In this stage, all neces-

sary system clocks and the master sync pulse are generated. Also, the master counter

is realized. The count value of the master counter is fed via a serial interface to the

SELIC. In active redundancy mode, the master sync pulse is forwarded to the standby

ACLK. In standby redundancy mode, the generator is synchronized with the master

sync pulse coming from the active ACLK function. Therefore, both redundant ACLKs

generate their clocks in alignment. If necessary, a very fast redundancy switch-over ispossible.

referenceclockdivider

masterclock

divider

phase/

frequency

detector

D

A

BCC interface

OCVCXO

32, 768 MHz

master clock

referenceclock input

TOPtrackingoscillatorprocessorcontrolled

master sync inputfrom redundant ACLK

LTG

loadabletiminggenerator

2

48

164096

1966080master counterBCC Interface

SYNC

16,384 MHz8,192 MHz

4,096 MHz2,048 MHz

8 kHz

60 ms

SYNC

Driver

Stage

systemclocks

master syncmaster counts

master sync to redundant ACLK

reference clock to redundant ACLK

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The FPGA is configured after a power-on reset from the BCC. Until the configuration has

finished, no output clocks are available, i.e., a communication via Abis or CUs is not

possible. The communication path from the LMT to the BCC is not affected, i.e., a

SW-download via the LMT is possible.

3.1.2 Core Satellite (COSA6P16)

The COSA6P16 board (COSA6P16) has the following functions:

6 PCM30/24-interfaces for Abis

16 CU-interfaces

The board is controlled from the COBA via the SAT-interface (satellite-interface; 32bit

data). Fig. 3.4shows a block diagram of the COSA6P16:

Fig. 3.4 COSA6P16 block diagram

The key-element of the PCM-interfaces is the FALC (Framing and Line InterfaceComponent for PCM30 and PCM24). It has the following tasks:

analogue receive and transmit circuitry for PCM30 and PCM24

data- and clock-recovery

frame alignment/synthesis

line-supervision

timing-adaptation to BISONs

Data arriving from the Abis-Interface via a PCM-port can be switched non-blocking and

bitwise (8 kbit/s and n x 8 kbit/s data-rate possible) with the BISONs to another

PCM-Port or via a SELIC2 to a CU.

SELIC

BISON

OVPT

FALC54 for PCM30/24&

PCMport5

PCMport6

Interfacesto COBA

Real-Time BUS (Hopping)Non-Real-Time BUS (O&M)

toCUs

BISONBUS

RouteClocks

RouteClock

Preselector

RCLK1-6

CLKX1-6

WorkingClocks

DC/DCConverter

SAT-Interface(32bit data)

SELIC

SELIC

SELIC

SELIC

SELIC

SELIC

SELIC

OVPT


PCMport1

PCMport2

OVPT


PCMport3

PCMport4

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The route-clocks of one FALC can be switched with the route-clock multiplexer to the

COBA for synchronization purposes. The COSA6P16 gets its working-clocks from the

COBA.

The COSA6P16 is switched with relays to the PCM-lines. In case of failures, thePCM-port 1(3)(5) and 2(4)(6) can be short-circuit with each other via appropriate relays.

There is a power-on device on the COSA6P16, which generates a reset at power-on

(board-reset). Via a line, the COSA6P16 can be reset from the COBA (board-reset).

Additionally, single devices on the COSA6P16 can be reset from the COBA via the

SAT-interface.

3.2 Carrier Unit (CU)

The Carrier Unit (CU) takes care for all carrier oriented tasks. In the uplink (UL) direction

two RF signals (diversity) are received and finally converted into TRAU frames and

signalling data. In the downlink (DL) direction, TRAU frames and signalling data arereceived and converted into a GMSK modulated RF signal, which is amplified to the

desired power level.

The CU consists of the following sub-units:

Power Amplifier and Transceiver Unit (PATRX)

Signal Processing Unit (SIPRO)

Power Supply Unit (PSU)

There are four variants of the CU for the frequency bands GSM850, R-GSM900,

DCS1800 and PCS1900. The differences of the variants arise mainly on the sub-unit

PATRX.

Fig. 3.5 Carrier unit block diagram

Power Amplifier and Transceiver Unit (PATRX)

PATRX provides the main analog functions of the CU:

receives the two (diversity) RF signals from the antenna combining equipment and

dawnconverts them to IF. The downconverted RF signals are then transmitted to

SIPRO where they are sampled and digitally downconverted to baseband.

receives the GMSK modulated signal from the SIPRO. The signal is then I/Q modu-

lated, upconverted, levelled, power amplified, and transmitted to the antenna

combining equipment.

supports the synthesizer frequency hopping provides an RF loop between downlink and uplink path for the unit test of the CU

SIPRO

PSU

PATRXCC-Link

-48V DC

Rx inputs

Tx output

Test PC/OMT, SCC,Layer 1 Trace, JTAG,PID, Vcce Loop

Display

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The power control loop implements 6 static power steps (each 2 dB) and an additional

15 dynamic power levels (each 2 dB). For low output power versions of the CU, a further

reduction of 2 dB is provided.

Fig. 3.6 PATRX block diagram

The functional sub-unit PATRX consists of three PCBs:

RXA:Analog receiver board with modules RXFEM, RXFED, RXLO and LTL

TXA:Analog transmitter board with modules MODUP, TXLO,and PWRDET

PWRSTG:Power stage including heat sink

Signal Processing Unit (SIPRO)

The SIPRO-Board is a part of the Carrier Unit. It contains all digital functions of the

carrier unit, including the following:

Signal Processing in uplink and downlink

Control of RF on PATRX

Baseband and synthesizer hopping

Channel Control

Radio Link Control

O&M parts relevant for carrier unit

Link to Core via CC linkAdditionally, following analog functions are located on SIPRO:

Analog to digital conversion (IF)

Digital to analog conversion (baseband)

Local clock of CU

Due to the analog functions, SIPRO is specific for the different frequency variants. There

are two types of SIPROs (one for GSM850/GSM900, and one for DCS1800/PCS1900).

Fig. 3.7illustrates the principal data flow on SIPRO:

receives two (diversity!) IF signals from the receiver, then analog to digital conver-

sion takes place. The next step is digital down conversion to the base band and

filtering. The output of the filter is equalized. The soft decisions from the equalizer

are then deciphered. Thedeciphered data stream is processed by thedecoder. After

to SIPRO for

LCLK from SIPRO

GMSK modulated

TXBB

Rx input

Tx output

RXFEM

RXFED

RXLO

TXLO

LTL

PWSTG MODUP

PWRDET

(diversity) downconversionto baseband

signal from SIPRO

RF Controlfrom SIPRO

from SIPRO

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decoding (including bad frame indication), the data stream is packed into TRAU

frames and sent to the TRAU. Signalling data (e.g., FACCH) are processed by layer

3 of BTS software

receives the TRAUframes or signalling data. The TRAU frames are unformatted and

sent to the coder. After encoding, data are ciphered. Now, baseband hopping takes

place. Training sequence is inserted in the data received via the hopping bus. These

bursts are sent to the GMSK modulator. This stream is converted into an analog

baseband signal leaving the SIPRO.

parallel to the data stream, the PLLs for synthesizer hopping are programmed.

Therefore, both for uplink and downlink, a data stream to the PLLs is generated.

Fig. 3.7 Principal data flow on SIPRO

Power Supply Unit (PSU)

The PSU is the DCDC converter for the CU for all applications. The PSU generates the

voltages +26/28V, +6V (only DCS/PCS), +12V, +5.3V and -5.3V for the analog circuitry

and +3.35V for the digital circuitry from a -48V primary input voltage. The PSU is

mechanically incorporated in the CU.

3.3 Edge Carrier Unit

The ECU unit is a modified CU using the same interfaces as CU but supporting EDGE

functionality in uplink and downlink. In downlink direction, the signalling and traffic data

are received from the core network and converted into GMSK or EDGE modulated

signal, which is amplified to the desired power level.

With the introduction of EDGE it is possible to mix EDGE and non EDGE timeslots on

the same carrier.

The ECU carries two independent receivers (normal and diversity channel) to provide

the antenna diversity function. In uplink direction, the received signal is converted to

IF-band. The IF-band is converted to a digital GMSK/8PSK-signal.

The 8PSK is a linear modulation, where three consecutive bits are mapped to symbol

as shown in table 3.2.

Uplink

Downlink

A

D

A

D

Hopping PLL

Hopping PLLControl

Central

diversity 2 2Digital Down-Conversion Equalization Deciphering Decoding

TRAU FrameFormatting

Signalling

TRAU FrameDeformatting

Signalling

CodingCipheringGMSK

Modulation

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With the 8PSK modulation, the payload/burst is three times more.

The mechanical design of ECU is identical to that of CU versions.

ECU and CU modules may be installed in any kind of mixed configurations concerning

BS-240/241 hardware (Base/Extension Cabinets). Further, any cell/sector configuration

with a mixture of EDGE CU and normal CUs can be implemented.

3.3.1 General

The EDGE Carrier Unit (ECU) takes care for all carrier oriented tasks of the BTS. In

uplink (UL) direction, two RF signals (diversity) are received and finally converted into

TRAU frames and signalling data. In downlink (DL) direction, TRAU frames and signal-

ling data are received and converted into a GMSK or EDGE modulated RF signal, which

is amplified to the desired power level.

An BTS rack can be equipped by any combination of ECU and CU (see fig 3.8)

Modulating bits Symbol

(1,1,1) 0

(0,1,1) 1

(0,1,0) 2

(0,0,0) 3

(0,0,1) 4

(1,0,1) 5

(1,0,0) 6

(1,1,0) 7

Tab. 3.2

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Fig. 3.8 Position of the ECU and CU in the BTS

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3.3.2 Mechanics

Mechanical design of the ECU 1800 is identical to that of CU versions for BTSplus. The

EPATRX , ESIPRO and PSU Blocks are integrated in one insert-card. In EPATRX Block

are situated the ERXA, ETXA and EPWRST groups.

3.3.3 Transmitter Function

In the downlink direction, the EPATRX receives from ESIPRO a GMSK-or 8PSK modu-

lated signal in baseband (I and Q modulated), which is upconverted to final transmit

frequency. Linearization of the transmitter is done by means of an adaptive predistor-

tion.

3.3.4 Receiver Function

The EPATRX carries two independent receivers (normal and diversity channel) to

provide the antenna diversity function. In uplink direction, the received signal is

converted via one frequency to IF-band. This IF-band signal is direct A/D converted to

a digital GMSK/8PSK-signal.

3.3.5 Local Test Loop

A local test loop allows a basic functional test of ECU (EPATRX and ESIPRO groups).

This test is initiated and controlled by ESIPRO group. In contrast to the CU, the LTL test

of the ECU includes the EPWRSTD.

3.3.6 Supported frequency range

PCS-band:

RX band:(1850 - 1910) MHz

TX band:(1930 - 1990) MHz

GSM-band:

RX band: (824 - 849) MHz

TX band: (869 - 894) MHz

3.3.7 Power Supply Unit

The ECU is supplied by -48 V DC and uses incorporated DC/DC converters.

3.3.8 Functional description

The ECU unit is a new developed and enhanced CU unit which supports the GMSK and

8PSK Modulation in uplink and downlink. It is a HW compatible to the CU unit and fits

into the BTSplus rack. A functional description of the whole receive and transmit path

including the EDGE Carrier Unit and the antenna combining equipment can be found in

[3.3.9].

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3.3.9 Functional structure of the EDGE Carrier Unit

The ECU (Figure 3.9) consists of following functional subunits:

Power Amplifier and Transceiver Unit (EPATRX)

Signal Processing Unit (ESIPRO)

EDGE Power Supply Unit (EPSU)

Fig. 3.9 Epatrix and Esipro function block diagram.

3.3.10 Main differences between ECU and CU

The design approach of this early ECU was to support the EDGE capability by mini-

mizing the changes to the CU HW. The following major changes to the CU HW weremade to support the EDGE functionality:

1. New Power Amplifier with better linearity and approximately 3 dB higher peak power

capability

2. New power levelling concept including a digital power control loop

3. New TX-VGA and PWRDET due to new power control

4. Adaptive predistortion to linearize the transmitter

5. New module Predistortion receiver (PDRX)

6. New IQDEM (IF-sampling ADC) with higher dynamic

7. RXA adaption to new IQDEM

8. New Power Supply Unit (EPSU) with higher power capability

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3.3.11 EDGE Power Amplifier and Tranceiver Unit(EPATRX)

EPATRX (figure 3.10) provides the main analog functions of the CU. In uplink direction,

two (diversity) preamplified and filtered RF signals are received from the antenna

combining equipment. These signals are down converted to IF and channel filtered inthe RXFE stage. The IF signals are then transmitted to ESIPRO, where they are

sampled and digitally down converted to baseband. In downlink direction, the GMSK or

8PSK modulated signal is received from the ESIPRO, I/Q modulated and up converted

by the MODUP stage, which also provides the levelling of the output power.

The obtained RF signal is then power amplified by the module EPWRST and transmitted

to the antenna combining equipment. A part of the transmitted power is fed to the

module PWRDET, which performs the power detection. This signal is used to close the

digital power loop.

The Predistortion Receiver (PDRX) down converts the transmit signal to the TX-IF for

the I/Q-Demodulation and adjusting the predistortion values. The transmitter is linear-

ized by means of an adaptive digital predistortion which is applied to the basebandsignals. For the introduction of the ECU (BR6.01), a static predistortion was choosen for

linearization of the transmit path. The HW is able to do adaptive predistortion, which can

be installed by SW update during BR 7.0. EPATRX is able to support synthesizer

frequency hopping by the implementation of the synthesizer modules RXLO and TXLO.

The unit test of the ECU is supported by the module LTL, which provides an RF loop

between downlink and uplink path.

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Fig. 3.10 EPATRIX INTERFACES

3.3.12 Signal processing unit (ESIPRO)

The ESIPRO-Board of the BTSPLUS is a part of the Carrier Unit. It contains all digital

functions of the Carrier Unit:

Signal Processing in uplink and downlink

Control of RF on EPATRX

Baseband and synthesizer frequency hopping

Channel Control

Radio Link Control

O&M parts relevant for carrier unit

Link to Core via ASIC SELIC

Digital Modulation

Predistortion signal processing

Digital part of Power control

Additonally, following analog functions are located on ESIPRO:

Analog to digital conversion (RXIF)

Digital to analog conversion (TX-baseband, TX-ramping)

Analog to digital conversion (PDRX)

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Analog to digital conversion of Diode voltage

Analog to digital conversion of temperature

Local clock of CU

To understand the functional structure of ESIPRO, knowledge of the principal data flow(see Figure 3.11) on ESIPRO is very useful.

In uplink direction, an IF-signal with a frequency of more than 100 MHz (GSM -

151.2MHz, DCS/PCS/GSM850 - 248.6MHz) arrives from ERXA at the ADC (Analog

Digital Converter). The ADC output is processed by a DDC (Digital Down Converter).

The DDC transforms the signal into baseband and filters the useful part of the signal.

The quasi analog signal at the output of the DDC is converted into bits with reliability

information (soft decisions) in the equalizer block. The soft decisions are deciphered

and decoded. Traffic channels (e.g., TCH/FS) are sent via TRAU/PCU frames to

TRAU/PCU. Signalling channels (e.g., SDCCH) are sent to the CORE of the BTS.In

downlink direction traffic channels arrive as TRAU/PCU frames from TRAU/PCU and

signaling data come from CORE. The data symbols are coded and ciphered. Afterwardsbase band hopping takes place via the CC link. ESIPRO sends the ciphered data to

another ECU and receives data to be transmitted. The received data are modulated as

GMSK or 8 PSK signals and given as a base band signal to ETXA.Both in uplink and

downlink direction PLLs have to be programmed once each burst to implement synthe-

sizer hopping.

Fig. 3.11 Data flow in ESIPRO

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3.3.13 EPSU (Power Supply Unit)

The EPSU is the DC/DC converter for the ECU for all applications. The EPSU generates

the voltages +26V/+28V, +12V, +5,3V and -5,3V for the analog circuitry and +3.3V for

the digital circuitry from a -48V primary input voltage. The only interface relevant changewas the change of the analog bias voltage for the EPWRSTD to +12V. The EPSU is

mechanically incorporated in the ECU.

The EPSU is a slightly modified version of the PSU of the GSM CU. In this document,

not all Interface names are changed to EPSU. Therefore, PSU can be seen as a

synchronym for EPSU in this document.

3.4 Duplexer Amplifier Multi Coupler (DUAMCO)

The DUAMCO consists of two identical modules. Every module contains a duplex filter,

which combines the RX and the TX path together, to be fed to a common antenna. The

DUAMCO combines 1 (see Fig. 4.2), up to 2 (see Fig. 4.3) or up to 4 (see Fig. 4.4)carriers to one antenna and consists of two branches constituted by:

a LNA (Low Noise Amplifier) which takes care of a low system noise figure

an attenuator (in case of installed TMAs, additional gains greather than the cable

losses must be adjusted by means of the attenuator)

a second low noise amplifier

a power splitter which distributes the received band to the CUs (Carrier Units)

a transmit path which consists of:

an isolator which protects the PAs (Power Amplifiers) inside the CUs from each

other in order to assure the required intermodulation suppression

a hybrid coupler which provides the reference signal for dynamic and static power

control. The corresponding not transmittedpower is terminated in a load including

a cooler (for DUAMCO 4:2 and DUAMCO 8:2)

an ASU (Antenna Supervision Unit) which is responsible for detecting certain

reflection factors at the antenna connector. The ASU detects the VSWR failure

and generates a failure information towards the O&M (CAN bus interface). This

information is subdivided in several levels with the following characteristics:

- VSWR < 2 neither generation of warning nor of an alarm

- 2 VSWR 3 generation of warning 'Antenna not Adjusted'

- VSWR > 3 generation of VSWR alarm 'Antenna Faulty'.

and a common part constituted by:

a PDU (Power Distribution Unit) for two TMAs (Tower mounted Amplifier) connected

to the TMAs by means of an antenna feeder cable

an O&M interface which transmits error messages to the BTS core via a slow O&M

bus (CAN bus)

The DUAMCO amplifier has two different operation modes:

the AMCO mode where no TMA is used

in case a TMA is used the DUAMCO is configured in the MUCO mode

The PDU provides the DC power supply and the alarm supervision of the TMAs. Alarm

monitoring is done with a signalling interface between DUAMCO and TMA, modulated

onto a IF carrier at 7.86 MHz.

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3.5 DI(=2) Amplifier Multi Coupler (DIAMCO)

For the uplink direction, the DIAMCO is used to filter and distribute the received signals

to the Carrier Units in one rack. The DIAMCO consists of two branches constituted by:

a receive filter a low noise amplifier (LNA) which takes care of a low system noise figure

an attenuator

a second low noise amplifier

a power splitter which distributes the received band to the CUs (Carrier Units)

and a common part constituted by:

a PDU (Power Distribution Unit) for two TMAs (Tower mounted Amplifier) connected

to the TMAs by means of an antenna feeder cable

an O&M interface which transmits error messages to the BTS core via a slow O&M

bus (CAN bus)

The DIAMCO RX amplifier has two different operation modes:

the AMCO mode where no TMA is used

in case a TMA is used the DIAMCO is configured in the MUCO mode

3.6 Filter Combiner (FICOM)

With the FICOM, it is possible to combine up to 8 frequencies in downlink direction (TX)

in one rack. For the uplink direction (RX), the DIAMCO has to be used to filter and

distribute the received signals to the Carrier Units. The FICOM consists of remote

tunable narrowband filters (TNF). The advantage of this filter combining technique is the

very low insertion loss, if e.g., 8 transmitters are combined to one antenna.

In principle, the FICOM offers the following functions:

RF Functions: RF Power Combining

Transmitter Spurious Signal Suppression

Isolation between inputs

Isolation output to input

Control / Monitoring Functions:

Antenna VSWR alarm thresholds setting and status reporting

Internal Performance Monitoring

Interfacing with BTSE

LED Display:

Antenna VSWR alarms

Tuning alarms Presence of DC

Lightning Protection at the RF output connector (7/16)

3.7 Tower Mounted Amplifier (TMA)

The TMA connects the antenna with the BTSE in order to amplify the receive signal and

pass through the transmit signal. The TMA contains two duplex filters, each on one RF

connector, to separate and combine the receive and transmit path inside of the TMA.

The TMA consists of the following:

RX parts of the duplex filter and

LNA (Low Noise Amplifier) that takes care of a low system noise figure of the RX part

TX parts of the duplex filter

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The DC power for the TMA is feed into the triplexer by the PDU (Power Distribution Unit)

functionality of the DUAMCO/DIAMCO.

The Encoder/Decoder units of the TMA signalling interface generate an alarm for each

TMA separately by supervising the DC current consumption of each unit.Note: When the TMA is used the DUAMCO/DIAMCO works in the so called MUCO

(multi coupler) mode. In the MUCO mode, the DUAMCO/DIAMCO mainly works as multi

coupler to split the receive signal for the following CUs.

3.8 High Power Duplexer Unit (HPDU)

The High Power Duplexer has the task of combining the TX- and the RX-path into one

antenna, in order to minimize the number of antennas when FICOM is used. The HPDU

contains a duplex filter for the transmit frequency band and for the receive frequency

band, but no Low Noise.

Amplifier in the RX path.If the TMA shall be used together with a HPDU a so calledBIAS-T (DUBIAS) for powering and signalling of the TMA is required. Up to two HPDU

can be integrated on top of the rack below the cover and also up to two HPDU could be

fit in the gap between the inner side wall and the sub-rack in the shelter.

Note: HPDU is available working in the GSM-PS Primary Shifted band.

3.9 DC Panel (DCP)

The DC Panel contains the circuit breakers to protect the DC power lines for the

modules, the ACTP, FAN units, HEX, LE units. The LMT connector is integrated into the

front of DC panel located in the Base rack.

The DC Mains Supply Unit is located at the EMI-Panel of the BS-240/241 II Base rack,Extension rack, and Service 2 rack.

The DC Mains Supply Unit comprises the lightning protection (optional feature), the

EMI-filter, and the terminal clamps for external DC supply cable (-48V, 0V).

The lightning protection element indicates a fault condition at an alarm output (Lightning

Protection Alarm - LPA). The LPA signal is linked to the Alarm Collection Terminal.

3.10 DC Link Equipment Panel

The DC Link Equipment Panel provides the distribution of the 48 V supply voltage to

the modules within the BS-240/241 II Service 2 Racks and integrates the required DC

breakers for the different circuits.

If link equipment is installed into Service 1A and Service 2 cabinets then the associated

DC:LE-panel can be equipped with breakers. The LE breakers can be plug-in during

installation of link equipment at the BTSE site.

At the front of panel, the high-current clamp terminals are located for connecting the DC

supply lines (-48V, 0V).

The Alarm Collection Terminal module (ACT-C) is also integrated into the DC:LE-Panel

assigned to Service 2 cabinet. The ACT-C module is capable for collecting up to 8

cabinet alarms, and the alarms generated by fan units, battery temperature sensors,

lightning protection alarm (LPA / OVP), and rack door open sensor.

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3.11 Alarm Collection Terminal (ACT)

The physical function of the ACT is to transfer the alarm and command signals from the

alarm command connectors of the BTSE subsystem via the CAN BUS to the Core

Controller.The ACT functionality is realised by a set of modules :

processor board - ACTP

interface board for external signals - ACTA

interface module for internal signals - ACTC

The interface of operator specify alarms (site inputs and site outputs) is allocated to the

Base rack. For this purpose, an ACT master module (ACTM) is installed into the Base

rack. The ACTM module consists of an ACTP board and an ACTA board.

The tasks of the ACTP are :

Interface to CAN BUS

Collection of alarms for units having no access to O&M bus or to the Core Controller;

Collection of so-called cabinet specific alarms (Door open, FAN0 to FANx, Smoke.. Temperature supervision via an external temperature sensor .

Rack address adjustment.

The special tasks of the ACTA are :

Collection of so-called operator available alarms (24 site inputs and 8 site outputs).

Indoor lightning protection

ACTC is installed once in each cabinet to collect all internal alarms. It has inputs for the

following alarm lines: rack door alarm, fan alarms, temperature alarms and internal

cabinet alarms, which can be defined by the operator. In the Base rack, the ACTC is

directly connected to the COBA.

For input of rack alarms, a 24-Pin WAGO terminal clamp is used on the ACTC-3. The

ACTC-3 board provides 4-pin connectors for DC output (-48 V) / alarm interface and2-pin connectors for alarm interface only.

Fan units

Smoke sensor

Location Measurement Unit (LMU)

Rack Door Open sensor

Temperature sensor

Lightning Protection Alarm (LPA, also called Over Voltage Protection - OVP)

Types of Alarm Collection Terminal Modules:

ACTMV2 Alarm Collection Terminal (ACT) Master

M:ACTPV3 ACT Processor Module

M:ACTC-3Vx ACT Collector Version

Different ACT, are available depending on the applications in the Base Rack/Shelter

(ACTM) or in the Service and Extension Rack/Shelter (ACTP) as shown in Fig. 3.12.

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Fig. 3.12 Alarm collection terminal (ACTM and ACTP)

3.12 AC/DC converter (ACDC)

Up to 6 AC/DC converters (only one Frame) can be equipped in the service1 rack which

provide N+1 redundancy. AC/DC converters work in load sharing, but n AC/DC are ableto supply the whole BS-240/241 II .

Each AC/DC rectifier has an integrated fan to force airflow through the module for

cooling purposes.

A local AC/DC supervision and management system has been implemented which is

accessible via RS232 interface and external PC.

The AC/DC system alarms are collected at the ACTC and through-wired to the ACTP

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