38840325 a 13-2-4 technical description bs241 ii

5/20/2018 38840325 a 13-2-4 Technical Description BS241 II

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Information

Base Station System

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

A30808-X3247-L22-6-7618


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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 Produktsicherheit

LEBENSGEFAHR - 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 2005.

Issued by the Communications 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:

Sixth Edition for Release BR 7.0

Details:

Chapter/Section Reason for Update

1 The Chapter Has Been Improved

3 The Chapter Has Been Improved

Issue History

Issue

Number

Date of issue Reason for Update

1 07/2003 First Edition for New Release BR 7.0

2 12/2003 Second Edition for Release BR 7.0

3 03/2004 Third Edition for Release BR 7.0

4 08/2004 Fourth Edition for Release BR 7.0

5 06/2005 Fifth Edition for Release BR 7.0

6 09/2005 Sixth Edition for Release BR 7.0


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This document consists of a total of 70 pages. All pages are issue 6.

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1 Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.2 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2 Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1 Board Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.1.1 AC/DC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.1.2 Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.2 Rack Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3 Module Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1 Core (COBA and COSA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.1.1 Core Basis (COBA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.1.2 Core Satellite (COSA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.1.3 Core Link Extension (COREXT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.2 Carrier Unit (CU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.3 EDGE Carrier Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.4 GMSK Carrier Units (GCU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.5 Carrier Unit Output Power Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.6 Duplexer Amplifier Multicoupler (DUAMCO). . . . . . . . . . . . . . . . . . . . . . . . 35

3.7 Flexible Duplexer Amplifier Multicoupler (FDUAMCO) . . . . . . . . . . . . . . . . 36

3.8 Co-Duplexer and Multicoupler Extension for 8:2 (COAMCO8). . . . . . . . . . 38

3.9 Dual Integrated Amplifier Multicoupler (DIAMCO) . . . . . . . . . . . . . . . . . . . 383.10 Filter Combiner (FICOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.11 Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.12 High Power Duplexer Unit (HPDU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.13 DC Panel (DCP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.14 DC Link Equipment Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.15 Alarm Collection Terminal (ACT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.16 AC/DC Converter (AC/DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.16.1 DC and Battery Controller (DCBCTRL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.17 Overvoltage Protection and Tracer (OVPT). . . . . . . . . . . . . . . . . . . . . . . . 41

3.18 Abis Connection Module (ABISCON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.19 Abis Link Equipment (LE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423.20 Cover Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.21 Backup Battery (BATTERY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.22 Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.23 Heater Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4 Antenna Combiners and Receiving Paths . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1 Methods of Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1.1 TX Attenuation of Combiner Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

4.1.2 DUAMCO - DIAMCO GAIN (RX Path). . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.1.3 FDUAMCO GAIN (RX Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.1.4 Parameters of Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . 594.1.5 Examples for BTSE Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61


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


4.2 FCC Issues (for US Market Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5 Power Supply and Battery Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.1 Support of Emergency Operation for 3rd Party BBU System . . . . . . . . . . . 68

6 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69


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Illustrations

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

Fig. 2.2 BS-241 II outdoor Cabinet (Base Rack). . . . . . . . . . . . . . . . . . . . . . . . . 15

Fig. 2.3 Functional Blocks of the BS-240/241 II. . . . . . . . . . . . . . . . . . . . . . . . . 16

Fig. 2.4 Redundant COREs and their Interfaces . . . . . . . . . . . . . . . . . . . . . . . . 18

Fig. 2.5 BS-240 II Base Rack and 2 Extension Racks. . . . . . . . . . . . . . . . . . . . 20

Fig. 2.6 BS-241 II Base Shelter and 2 Extension Shelters . . . . . . . . . . . . . . . . . 21

Fig. 2.7 Possible Configuration of Service1-Rack. . . . . . . . . . . . . . . . . . . . . . . . 22

Fig. 2.8 Possible Configuration of Service2-Rack. . . . . . . . . . . . . . . . . . . . . . . . 23

Fig. 2.9 BS-240/241 II Fully Equipped with 24 Carriers. . . . . . . . . . . . . . . . . . . 24

Fig. 3.1 Connections of Major Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Fig. 3.2 COBA internal architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Fig. 3.3 Core Satellite Board (COSA) internal architecture. . . . . . . . . . . . . . . . . 29

Fig. 3.4 System with COBA4P12 and COREXT. . . . . . . . . . . . . . . . . . . . . . . . . 30

Fig. 3.5 Internal Components of the Carrier Unit. . . . . . . . . . . . . . . . . . . . . . . . 31

Fig. 3.6 FDUAMCO Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Fig. 3.7 Example of Battery Backup Systems Connected to the AC/DC . . . . . . 43

Fig. 4.1 Overview of Combining Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Fig. 4.2 DUAMCO 2:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fig. 4.3 DUAMCO 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fig. 4.4 DUAMCO 8:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Fig. 4.5 FICOM 8:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Fig. 4.6 DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Fig. 4.7 HPDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Fig. 4.8 Configuration with HPDU, DUBIAS and TMA. . . . . . . . . . . . . . . . . . . . 54

Fig. 4.9 Configuration with Diplexer (Example) . . . . . . . . . . . . . . . . . . . . . . . . . 55

Fig. 4.10 Multi-cell (3,3,2): with 3 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . . 61

Fig. 4.11 Multi-cell (3,3,2): with 2 DUAMCO 4:2 and 1 DUAMCO 2:2. . . . . . . . . 61

Fig. 4.12 Single-cell (8,0,0): with FICOM and DIAMCO. . . . . . . . . . . . . . . . . . . . 62

Fig. 4.13 Single-cell (8,0,0): with 2 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . 62

Fig. 4.14 Multi-cell (2,2,2): with 3 DUAMCO 2:2. . . . . . . . . . . . . . . . . . . . . . . . . . 63

Fig. 4.15 FDUAMCO Configuration 2:2 or 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Fig. 4.16 Configuration of FDUAMCO / COAMCO8 . . . . . . . . . . . . . . . . . . . . . . . 64Fig. 4.17 Single-cell (11...16,0,0): FICOMs, DIAMCOs and HPDUs in 2 Racks. . 65


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Tables

Tab. 1.1 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Tab. 1.2 Frequency Bands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Tab. 3.1 Units and Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Tab. 3.2 Carrier Unit Output Power Level (Typic. and Guarant. Values) per TRX 35

Tab. 4.1 Insertion loss of FICOMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Tab. 4.2 Insertion loss of FDUAMCOs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Tab. 4.3 Insertion loss of DUAMCOs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Tab. 4.4 Insertion loss of HPDU and TMA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Tab. 4.5 Parameters of DUAMCO - DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Tab. 4.6 Parameters of FDUAMCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Tab. 4.7 Parameters of 900 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . . 59

Tab. 4.8 Parameters of 1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . 60

Tab. 4.9 Maximum RF Power Output Values at Antenna Port. . . . . . . . . . . . . . . 66

Tab. 4.10 Maximum RF Power Output Values at Antenna Port. . . . . . . . . . . . . . . 67


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

have been introduced in the mechatronics which represent the latest state of tech-

nology.

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. Any operation for rack extension or TRX substitution doesnt involve

service interruption. The provision of a full spectrum of combining equipment allows high

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

The modular architecture and the flexible internal structure, enables the BS-240/241 II

to provide GSM features such as EDGE; this platform ensures that network evolution is

as smooth as possible.

The use of the latest technology reduces power consumption and improves reliability;the reliability is also increased by the redundancy of all core modules. Easy integration

is possible in the already installed sites, for the backward compatibility with existing

SIEMENS SBS systems. High Site efficiency is assured for composite transmit power

with minimal footprint requirements.

Homogenous service throughout the network is assured by common BTS SW running

on all the platforms.

The BS-240/241 II primarily consists of:

Carrier oriented boards called Carrier Unit (CU),

Core boards COSA, COBA and

Combining equipment


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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. Service Racks/Shelters can be configured to accommodate

Backup Batteries and Link Equipment. A Service Rack/Shelter can be equipped withAC/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 GSM 850, GSM 900, GSM 1800

and GSM 1900 with the following configurations:

Single band

Dual band: GSM 900, GSM 1800; GSM 900, GSM 1900; GSM 850, GSM 1800 and

GSM 850, GSM 1900

Mixed cell configuration to enlarge GSM 900 cells with GSM 1800 frequencies, or

GSM 850 cells with GSM 1900 frequencies.

Single cell

Multi cell

Up to 6 cells per Rack and up to 12 cells per BTSE 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 duplexers (FDUAMCO) can be applied for 2, 4 and 8


Antenna combining with duplexers (FDUAMCO and COAMCO) can be applied for 8


Antenna combining with Filter Combiners (FICOM) is possible for up to 8 Carriersonto 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

Mixed Configurations of Cells/Sectors applying all types of carrier units: normal

Carrier Units (CU) and EDGE Carrier Units (ECU) .

Traffic Channels:

Full-Rate (FR)

Half-Rate (HR)

Enhanced Full-Rate (EFR) Adaptive Multi Rate Codec (AMR)

Services:

GPRS

HSCSD

EDGE

Frequency Hopping:

Baseband

Synthesizer

Redundancy:

Support of Core Redundancy Support of BCCH Redundancy


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Abis interface configurations:

Star, cross connect, loop and multidrop configurations are possible

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

possible without any interruption of service

External Abis link media can be connected:

Wire

Fiber optic

Micro-Wave


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1.2 Technical Data

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

BS-240 for indoor installation.

BS-241 for outdoor installation ( integrated power supply, battery, link equipment.)BS-240/241 II consist in a BTS architecture, with:

- 1 Base Rack

- Up to 2 Extension Racks

- Up to 4 Service Racks (1 Service1A and 3 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)

Typical Power Consumption Base Rack 1370 W with CU1950 W with ECU

1370 W with CU1950 W with ECU

Typical Power Consumption Extension Rack 1285 W with CU1860 W with ECU

1285 W with CU1860 W with ECU

Weight of Basic Rack in typical Configuration ca. 190 kg (419 Lbs) ca. 240 kg (529 Lbs)

Weight of Extension Rack in typical Configu-ration

ca. 190 kg (419 Lbs) ca. 240 kg (529 Lbs)

Weightof Service 1 in Configuration: AC/DC;F:Battery 1x (type A400/85)

ca. 264 kg (582 Lbs) ca. 314 kg (692 Lbs)

Weight of Service 2 in Configuration:F:Battery 3x (type A400/85)

ca. 490 kg (1080 Lbs) ca. 540 kg (1190 Lbs)

Temperature Range -5 C to + 45 C+23 F to +113 F

-33C to + 50C-27 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 (Primary) 890.2 - 914.8 935.2 - 959.8

E-GSM 900 (Extension) 880.2 - 914.8 925.2 - 959.8

PS-GSM 900 (Shifted to E-GSM) 880.2 - 905.0 925.2 - 950.0

R-GSM 900 (Railway) 876.2 - 914.8 921.2 - 959.8

GSM-RE 900 (Railway Extension) 876.2 - 901.0 921.2 - 946.0

GSM 1800 1710.2 -1784.8 1805.2 -1879.8

GSM 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 GSM

850, GSM 900 with its different deviates (GSM 1800, GSM1900) and standards selected

for mobile communication systems. Fig. 2.1 shows the indoor Base Rack Cabinet.

Fig. 2.2shows the outdoor Base Rack Cabinet.

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


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Fig. 2.2 BS-241 II outdoor Cabinet (Base Rack)


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The BTS functional blocks of the BS-240/241 II are shown in Fig. 2.3

Fig. 2.3 Functional Blocks of the BS-240/241 II

CU 7

CU 0

CU 7

Base Rack

Service Rack

DUAMCO CU 0

COSA

ACTM

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

AC/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

CAN BUS


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

small BTSs.

The BS-240/241 II mainly consists of:

carrier oriented boards called Carrier Unit (CU), core boards (COSA, COBA) and

combining equipment

The communication between the CU and CORE modules is provided by means of bi-

directional CC-link.

The communication between all other modules and the CORE Unit is provided by the

CAN bus.

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 Multicoupler

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 LE Link Equipment

COSA Core Satellite TMA Tower Mounted Amplifier

CU Carrier Unit


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18 A30808-X3247-L22-6-7618



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 Service1A 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 CORE redun-

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

interrelation of both COREs.

Fig. 2.4 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 be connected.

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.

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

provides a communication interface between the two main processors.

CUSELIC

SELIC

RD

Interf.

SwitchLogic

CORE 0CLK

Route Clock

Redundancy Link

Switch Logic Link

Route Clock

(Frame Sync)

ABISCAN

LMT

P

CUSELIC

CUSELIC

SELIC SELIC SELIC

RD

Interf.

SwitchLogic

CORE 1CLK

Route Clock

P

SELICSELIC

PCMSwitch

PCMSwitch

PCMLinkTerm.

PCMLinkTerm.


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A30808-X3247-L22-6-7618 19



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

the passive CLK 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 Rack Configuration

The BS-240/241 II family, with 8 transceivers per Rack, is expandable up to 24 trans-

ceivers in 3 Racks and can be supplied in two versions:

a BS-240 for indoor installation

a BS-241 for outdoor installation

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. 2.5and Fig. 2.6:


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20 A30808-X3247-L22-6-7618



Fig. 2.5 BS-240 II Base Rack and 2 Extension Racks

ACOM

0

ACOM

1

ACOM

2

ACOM

3

DC-PANEL

ACT-C

CU

2

CU3

CU6

CU7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-240SIEMENS

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-240SIEMENS

COBA

0

COSA

0

COBA

1

COSA

1

FAN 0 FAN 1

ACOM

0

ACOM

1

ACOM

2

ACOM

3

DC-PANELACT-C

CU

2

CU

3

CU

6

CU

7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-240SIEMENS

FAN 0 FAN 1

DC-PANELACT-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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A30808-X3247-L22-6-7618 21



Fig. 2.6 BS-241 II Base Shelter and 2 Extension Shelters

Fig. 2.9 shows the max possible configurations. The Base Rack and the Extension

Racks can be located physically in any position.

The Service Rack (see Fig. 2.7 and Fig. 2.8 for possible configuration) satisfies various

applications depending on number of CU units configured and/or number and kind of

Network termination equipment provided and the Battery Backup time required.

CU

2

CU

3

CU

6

CU

7

MUCO0

MUCO1

CU

0

CU

1

CU

4

CU

5

BS-241SIEMENS

COBA

0

COSA

0

COBA

1

COSA

1

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

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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22 A30808-X3247-L22-6-7618



Fig. 2.7 Possible Configuration of Service1-Rack


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A30808-X3247-L22-6-7618 23



Fig. 2.8 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.


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24 A30808-X3247-L22-6-7618



Fig. 2.9 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, Service1A and Service2 Shelters.

BS-241 II - DC (DC supplied version of BS-241 II)

The Shelter of this BTS version are externally DC supplied; in this application only using

a Service 2 Rack without Service 1 Rack.

Extension Rack

Base Rack

Service1A Rack

Service2 Rack

Extension Rack


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A30808-X3247-L22-6-7618 25



3 Module Description

Name Freq.Var.

Remarks

Core modules:COBACOSACOREXT

Core basisCore satelliteCore link extension board

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 canbe equipped in the Base and ExtensionRacks/Shelters.

Antenna system modules:DUAMCO / FDUAMCO2x

DUAMCO / FDUAMCO4xDUAMCO / FDUAMCO8xDIAMCOxFICOMBxFICOMXxTMAxHPDUxCOAMCO8

Duplexer 2:2

Duplexer 4:2Duplexer 8:2Diversity multicouplerFilter combiner (base)Filter combiner (extension)Tower mounted amplifierHigh power duplexerCo-Duplexer and Multicou-pler Extension for 8:2

yes Antenna system modules can beequipped in the Base and Extension

Racks/Shelters.DIAMCO, FICOM and HPDU are notavailable for the GSM 1900 band.DUAMCO / FDUAMCO and HPDUworking in shifted primary GSM 900 bandare available.A Diplexer can be used in all caseswhere GSM 900 and GSM 1800, GSM1900 and GSM 850, Feeder Cableshave to be installed in parallel.

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

ACTMACTP

Alarm Collection Terminals no ACTC is equipped in every Rack/Shelter.ACTM can be equipped in the Base

Rack/Shelter. ACTP can be equipped inthe Extension or Service Racks/Shelters.

Power supply modules:AC/DCDCBCTRL

AC/DC converterDC battery controller

no AC/DC controller used for AC power andsupervision of the ACDC converter canbe equipped in the Service Racks/Shel-ters.

OVPTOVPTCOAXABISCON

Over Voltage Protectionand tracerAbis Connection Module

no 100 / 120 balanced line75 coaxial line. The OVTP is anoptional feature.ABISCON can be installed as alternativeto the OVPT

Abis Link Equipment:LE

Link Equipment no Link Equipment can be equipped inService1 and Service2 Racks/Shelters

Cover Parts:CP:ACOMCP:CUCP:ACDCCP:DIAMCOCP:COBA, COSACP:ACT

Cover Parts have to beinserted if the respectiveactive module is notneeded in a configuration

no the air flow inside the Frame or Shelter isnot affected

Tab. 3.1 Units and Modules


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26 A30808-X3247-L22-6-7618



3.1 Core (COBA and COSA)The Core has the following tasks inside of the BTSE:

local controlling of the entire BTSE

generation of system clocks

providing of up to 8 Abis-interfaces to BSC or other BTSEs

routing of Abis-data to up to 24 CUs

providing an interface to the LMT Evolution/OMT

handling and processing of O&M-messages

Therefore, the Core can consist of up to 2 (without redundancy) or up to 4 (with redun-

dancy) boards. The following illustration shows the connection of the CU units and Abis

lines to the CORE units:

Battery Backup Battery systems no up to 4 battery systems can be equipped(only in the Service1A or Service2Racks/Shelters)

Fan Central Fan unit no for forced convection cooling

Heater:MEF Single Heater

no Heater can be equipped in all types ofShelters

Shelter Shelter of the Cabinet no Base, Extension, Service1A andService2 with MEF

Name Freq.Var.

Remarks

Tab. 3.1 Units and Modules


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A30808-X3247-L22-6-7618 27



Fig. 3.1 Connections of Major Modules

If more then 12 Carrier Units in the Base Rack or an Extension Rack are installed in

addition to the COBA module, a COSA module is mandatory.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.

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.

3.1.1 Core Basis (COBA)

Two COBA boards are developed:

COBA2P8

COBA4P12

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 digit the number of CU-inter-

faces, e.g., COBA2P8 (2 PCM30/24 Abis-interfaces, 8 CU interfaces).

The COBA4P12 board permits to optimise the split of CU-links and Abis interfaces.

The primarily concepts of the COBA2P8 / COBA4P12 cards are:

Low impact on O&M software Pin compatibility

Abis Abis

COBA COSA COBA red. COSA red.

Abis Abis

Abis

other

interfaces

Extension Racks

CUs

CUOVPT

8/12

8/6

8/6

Base Rack

CU

CC-Link CC-Link CC-Link CC-Link

6/4

2/4

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


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28 A30808-X3247-L22-6-7618



Maintenance of the current functionality (same feature, same redundancy concept)

Maintenance of the current LEDs signalling philosophy

The COBA is the central board of the core. The main components of this board are the

Base Core Controller (BCC), the Advanced CLock Generation (ACLK), the SErial Link

Interface Controller (SELIC) that manage the external interface towards the Carrier

Units, the PCM30/24 Abis interfaces, the internal system alarm interface and also an

interface to one satellite board (COSA) to expandi the COBA.

The most important functionalities of the COBA are the local controlling of the BTSplus,

the generation of the systems clocks, the management of all the internal/external inter-

faces and the routing of data to the CU. In addition the COBA handles all the O&M

messages and it manages the SW download functionality.

To fulfill the CORE redundancy aspects a redundant COBA can be installed. It works instandby mode. In case of a serious fault to the active COBA, the redundancy algorithm

switches over the redundant one. The redundancy implemented is a "cold" one. This

means that when the "cold" COBA goes in service there is no synchronization of data

with the faulty one, the service is interrupted during the transition phase and all the

active calls are therefore lost. In the next "Fig. 3.2 COBA internal architecture." the

internal components of the COBA are represented.

Fig. 3.2 COBA internal architecture.

The Advanced CLock Generation (ACLK) generates also the system specific timing

signals that are distributed to the external Carrier Units (CU).

i

A mixed configuration with COBA2P8 and COBA4P12 in the same BTSE is not

supported.

Abis1

Abis2

SAT-Inter

face

DC/DC Converter

SRAM

RDLLOGIC

WATCH

DOG

EEPROMsA/D-Conv. Mux

CAN-BUS, ALARMS LEDs, Redundancy Control,

Route clock

external CLK sync

CONTROLLER

BASE CORE ADVANCED

CLOCK

GENERATOR

Links to

LMT Interface

to

COSA

AlarmInterface

Flash Memory Input/Output PCM Switch

Internal Core Controller Bus

CUs

SERIAL

LINK

INTERFACE

CONTROLLER


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A30808-X3247-L22-6-7618 29



3.1.2 Core Satellite (COSA)

Two COSA boards are developed:

COSA6P16

COSA4P12

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 digit the number of CU-inter-

faces, e.g., COSA4P12 (4 PCM30/24 Abis-interfaces, 12 CU interfaces).

The primarily concepts of the COSA6P16 / COSA4P12 cards are:

Low impact on O&M software

Maintenance of the current functionality (same feature, same redundancy concept)

Pin compatibility

Maintenance of the current LEDs signalling philosophy

The main task of the COSA board is to increase the number of the Abis-interfaces and

CC-links of the Core Board (COBA) in order to provide in total up to 8 PCM30/24 ports

and up to 24 Carrier Units (CU).

The COSA is controlled via a satellite interface by the COBA and receives the

working-clock from the COBA.

The next "Fig. 3.3 Core Satellite Board (COSA) internal architecture" shows the internal

components and interfaces of the COSA board:

Fig. 3.3 Core Satellite Board (COSA) internal architecture

3.1.3 Core Link Extension (COREXT)

The COREXT board has to be used inside the COSA slot if no COSA is used and more

than 2 PCM interfaces or 8 CC-links (8 CUs ) shall be used with the COBA4P12.

Internal PCM Bus

Internal Core Controller Bus

SatelliteInterface

To COBA

PCM30/24ports

SerialLinkInterfaceController

To CUs

DC/DC converter Route ControlPreselector

Bus interface to COBA

PCMSwitch

AbisInterface


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30 A30808-X3247-L22-6-7618



The Core Link Extension board connects 4 CU ports and 2 Abis ports located at

COBA4P12 board via core backplane to the appropriate interfaces.

The COREXT is only a passive board without DC supply interface.

Two external Abis (PCM) lines are connected directly to the COREXT board. These Abis(PCM) lines are routed to the COBA4P12.

If Core redundancy is required, two COREXT boards shall be installed.

To apply the feature cross connect, either COSA4P12 or COREXT board must be

installed in Base Rack together with COBA4P12.

Fig. 3.4 System with COBA4P12 and COREXT

3.2 Carrier Unit (CU)

The Carrier Unit (CU) is composed by an analogue receive and transmit part with aSynthesiser and Power Amplifier (PA), by a SIgnal PROcessing unit (SIPRO) as well as

a Power Supply Unit (PSU). It has two receive inputs, one for the normal path, the other

for the diversity path. The CU contains all the functions that make up one carrier and

include synthesiser hopping and advanced equalizer functions for high speed applica-

tions.Besides it takes care for all carrier oriented tasks. In the uplink (UL) direction two

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

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

ling data are received and converted into a GMSK modulated RF signal, which is ampli-

fied to the desired power level.

There are three variants of the CU for the different frequency bands R-GSM 900, GSM

1800 and GSM 1900. The differences of the variants arise mainly on the Power Ampli-fier.


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A30808-X3247-L22-6-7618 31



Fig. 3.5 Internal Components of the Carrier Unit.

Power Amplifier and Transceiver Unit (PATRX)

The Power Amplifier and Transceiver Unit provides the main analog functions of the

CU:

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

converts them down to IF. The downconverted RF signals are then transmitted to

Signal Processing Unit where they are sampled and digitally downconverted to

baseband.

It receives the GMSK modulated signal from the Signal Processing Unit. The signal

is then I/Q modulated,upconverted, levelled, power amplified, and transmitted to the

antenna combining equipment.

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

Signal Processing Unit (SIPRO)

The Signal Processing Unit contains all the digital functions of the carrier unit, including

the following:

Signal Processing in uplink and downlink.

Control of RF on the Power Amplifier.

Baseband and synthesizer hopping.

Channel Control.

Radio Link Control.

O&M parts relevant for the carrier unit.

Link to the Core Board (COBA) via the CC link.

Additionally, also the following analog functions are managed:

Analog to digital conversion (IF).

Digital to analog conversion (baseband).

Management of CU local clock.

Due to the analog functions, the Signal Processing Unit is specific for the different

frequency variants. (one type for the GSM 900, and one for the GSM 1800, GSM 1900).

Power Supply Unit (PSU)

The Power Supply Unit is the DC/DC converter for the CU for all applications. It gener-

ates the voltages +26/28V, +6V (only GSM 1800, GSM 1900), +12V, +5.3V and -5.3V

cc-link

-48V DC

Rx inputs

Tx output

PowerAmplifier

SignalProcessingUnit

Power Supply Unit


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32 A30808-X3247-L22-6-7618



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 UnitThe EDGE Carrier Unit (ECU) is a modified CU that uses the same interfaces as the

CU but supporting the EDGE functionality in uplink and downlink. In downlink direction,

the signalling and traffic data are received from the Core and converted into GMSK or

8-PSK modulated signal, which is amplified to the desired power level.

With the ECU 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 the

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

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

The ECU and CU modules may be installed in any kind of mixed configurations. Further,any cell/sector configuration with a mixture of EDGE CU and normal CUs can be imple-

mented.

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 or PCU frames and signalling data. In downlink (DL) direction, TRAU or PCU

frames and signalling data are received and converted into a GMSK or 8-PSK modu-

lated RF signal, which is amplified to the desired power level.

Functional Structure of the EDGE Carrier Unit

The ECU consists of following functional subunits:

EDGE Power Amplifier and Transceiver Unit (EPATRX).

EDGE Signal Processing Unit (ESIPRO).

EDGE Power Supply Unit (EPSU).

EDGE Power Amplifier and Transceiver Unit ( EPATRX)

The EDGE Power Amplifier and Transceiver Unit provides the main analogic 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 in the RXFE stage. The IF signals are then transmitted to

ESIPRO, where they are sampled and digitally down converted to baseband. In down-

link direction, the GMSK or 8PSK modulated signal is received from the ESIPRO, I/Qmodulated 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 baseband

signals. For the introduction of the ECU,a static predistortion was choosen for lineariza-

tion of the transmit path. The HW is able to do adaptive predistortion, which can beinstalled by SW update. EPATRX is able to support synthesizer frequency hopping by


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A30808-X3247-L22-6-7618 33



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, tested ECU/GCU sends on the chosen test frequency with maximum power

on one timeslot.

EDGE Signal Processing Unit (ESIPRO)

The Signal Processing Unit board of the BTSplus is a part of the EDGE Carrier Unit. It

contains the following functions of the EDGE 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

Analog to digital conversion (RXIF)

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

Analog to digital conversion (PDRX)

Analog to digital conversion of Diode voltage

Analog to digital conversion of temperature

Local clock of CU

EDGE Power Supply Unit (EPSU)

The EPSU is the DC/DC converter for the ECU for all applications. The EPSU generatesthe 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 EPSU is mechanically incor-

porated 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.


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34 A30808-X3247-L22-6-7618



3.4 GMSK Carrier Units (GCU)

The GCU is a resembled ECU (the main sub-units are similar) which supports GMSK

modulation only, like the CU.

GCUs and CUs differ in the RF output power value for the GSM 1800 frequency band:

GCU: 54 W; CU: 37 W.

There are different variants of GCUs for the frequency bands GSM 900 and GSM 1800.

The types of GCU are the following:

GCUGV2 GMSK Carrier Unit for GSM 900 MHz

GCUDV2 GMSK Carrier Unit for GSM 1800 MHz


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A30808-X3247-L22-6-7618 35



3.5 Carrier Unit Output Power Level

The typical and guaranteed values of RF output power level are listed below for CUs,

GCUs and ECUs, dependent on its frequency bands and modulation types (GMSK and

8PSK).

3.6 Duplexer Amplifier Multicoupler (DUAMCO)

The DUAMCO consists of two identical modules. Each 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 with the following elements:

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

an attenuator (in case of installed TMAs, additional gains greater 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 heat sink (for DUAMCO 4:2 and DUAMCO 8:2)

an ASU (Antenna Supervision Unit) which is responsible for detecting certainreflection factors at the antenna connector. The ASU detects the VSWR failure

FrequencyBand

Carrier Unit Type TypicalRF Output Power

GuaranteedRF Output Power

GMSK 8PSK GMSK 8PSK

dBm Watt dBm Watt dBm Watt dBm Watt

CU/GCU GSM 900 CUGV3 / V4 47.3 54 -- -- 47.0 50 -- --

GCUGV2 47.3 54 -- -- 47.0 50 -- --

GSM 1800 CUDV3 / V4 45.7 37 -- -- 45.4 35 -- --GCUDV2 47.3 54 -- -- 47.0 50 -- --

GSM 1900 CUPV4 45.7 37 -- -- 45.4 35 -- --

ECU GSM 850 ECU850HPV2 48.3 68 46.3 43 48.0 63 46.0 40

ECU850V3 / V3A 48.3 68 46.3 43 48.0 63 46.0 40

GSM 900 ECUGV3 / V3A 48.3 68 46.3 43 48.0 63 46.0 40

GSM 1800 ECUDV2 47.3 54 45.3 34 47.0 50 45.0 32

ECUDHPV3 / V3A 48.3 68 45.3 34 48.0 63 45.0 32

GSM 1900 ECUPV2 47.3 54 45.3 34 47.0 50 45.0 32

ECUPHPV2 48.3 68 45.3 34 48.0 63 45.0 32

ECUPHPV3 / V3A 48.3 68 45.3 34 48.0 63 45.0 32

Tab. 3.2 Carrier Unit Output Power Level (Typic. and Guarant. Values) per TRX


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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 consisting of:

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, modulatedonto a IF carrier at 7.86 MHz.

3.7 Flexible Duplexer Amplifier Multicoupler (FDUAMCO)

The combining module FDUAMCO used for CUs, GCUs, ECUs and FCUs was

designed for the following configurations:

two cells with one carrier

one cell with up to 2 Carriers

one cell with up to 4 Carriers

one cell with up to 8 Carriers (with COAMCO module)

For each system GSM 850, GSM 900, GSM 1800 and GSM 1900 one type ofFDUAMCO is available.

The types of FDUAMCO are the following:

FDUAMCO850VX Flexible Duplexer Amplifier Multicoupler for GSM 850 MHz

(allows the integration of the SMR filter functionality)

FDUAMCOPGVx Flexible Duplexer Amplifier Multicoupler for P-GSM 900 MHz

FDUAMCOPS5Vx Flexible Duplexer Amplifier Multicoupler for PS-GSM 900 MHz

FDUAMCOEGVx Flexible Duplexer Amplifier Multicoupler for E-GSM 900 MHz

FDUAMCODVx Flexible Duplexer Amplifier Multicoupler for GSM 1800 MHz

FDUAMCOPVx Flexible Duplexer Amplifier Multicoupler for GSM 1900 MHz

Up to BR 7.0 max. 4 TRX can be connected to the FDUAMCO, or 8 TRX with

FDUAMCO/COAMCO8 8:2. Each half of the FDUAMCO can be configured inOne-To-One mode (like DUAMCO 2:2) and Two-To-One mode (like DUAMCO 4:2)

by means of jumper cables, which bypass the 3 dB hybrid or not. One-To-One means

that the hybrid is bypassed, Two-To-One means that the hybrid is used.

The FDUAMCO has a CAN bus interface and supports one frequency band. (see

Fig. 3.6)

A mix of 2 frequency bands within one FDUAMCO is not possible. The compatibility of

the frequency bands of the combiner and the carrier units must be checked by the

customer.

The FDUAMCO provides identical VSWR alarms and CAN bus connection as known

from the DUAMCO modules.

The integrated TMA interface is identical to the interface like in the DUAMCO modules.


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A30808-X3247-L22-6-7618 37



The use of the integrated hybrid is optional (use of jumper cables).

For more information about the FDUAMCO please refer to page 49.

Fig. 3.6 FDUAMCO Block Diagram

FDUAMCO

Tri-plexer

VSWRPROC

ANT1Testout1

RXout1

RXin1

Tri-plexer

VSWRPROC

ANT0Testout0

RXout0

RXin0

RXCA1RX0 RX2

RX1 RX3

RXCA0 RX3RX1

RX2RX0

TMASignall.

TMADC/DC

Convert.

DC/DC

Convert.

PID

CANControl.

DIPSwitch0

DIPSwitch1

Module0 Module1

1 ACOM Slot

TX1 TX0 TX1 TX02 1 4 3 2 1 4 3

3 dB Hybrid3 dB Hybrid

CAN Bus

RX TX

Filter Fil ter

TX RX

Fil ter Fi lter

LNA LNA

LNALNA


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3.8 Co-Duplexer and Multicoupler Extension for 8:2(COAMCO8)

A COAMCO8 unit consist of two identical Modules (0/1), each having a transmit and a

receive path. The COAMCO8 is used in conjunction with a FDUAMCO in 4:2 configura-

tion to provide an 8:2 configuration. (see Fig. 4.16)

The COAMCO8 combines 2 additional Carriers per module with the 2 Carriers from the

four output of the FDUAMCO.

3.9 Dual Integrated Amplifier Multicoupler (DIAMCO)

The installation of a DIAMCO Unit is required to implement two cells/sectors with RX

diversity in a Base or Extension Rack.

For the uplink direction, the DIAMCO module is used to split the RX antenna signal to

several receiver inputs.Therefore it filters and distributes the received signals to theCarrier 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

3.10 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


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A30808-X3247-L22-6-7618 39



Tuning alarms

Presence of DC

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

3.11 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

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

functionality of the DUAMCO or FDUAMCO or 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 or FDUAMCO or DIAMCO works in the so

called MUCO (multicoupler) mode. In the MUCO mode, the DUAMCO or FDUAMCO or

DIAMCO mainly works as multicoupler to split the receive signal for the following CUs.

3.12 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 frequencyband, but no Low Noise Amplifier in the RX path.

If the TMA shall be used together with a HPDU a so called BIAS-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 Frame in the Shelter.

Note: HPDU is available for working in the P-GSM 900, GSM 1800 and GSM-PS 900.

3.13 DC Panel (DCP)

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

modules, the ACTP, FAN units, LE units. The LMT Evolution connector is integrated intothe front of the 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.


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3.14 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.

3.15 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 interface of operator specific alarms (site inputs / outputs) is located in

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

into the Base cabinet.

The ACT functionality is realized by a set of modules:

Processor module -ACTP

Processor module with interface board for external signals -ACTM

Interface module for internal signals -ACTC

The tasks of the ACTP are:

Interface to CAN Bus for alarms collected by ACTC

Rack address adjustment

The ACTM module consists of a processor board and an interface board (ACTA) and is

applied for following tasks:

Iinterface to CAN Bus

Collection of so-called operator available alarms (48 site inputs)

Indoor lightning protection

ACTC is installed once in each cabinet to collect all internal alarms. It has inputs for 16

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

cabinet alarms, which can be defined by the operator. In the base cabinet, the ACTC isdirectly connected to the COBA.

For input of rack alarms, a 24-Pin spring pressure terminal clamp is used on the ACTC.

The ACTC board provides 4-pin connectors for DC output (-48 V) / alarm interface and

2-pin connectors for alarm interface only to following units:

Fan units

Smoke sensor

Rack Door Open sensor

Temperature sensor

Lightning Protection Alarm


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A30808-X3247-L22-6-7618 41



3.16 AC/DC Converter (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 .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 has external alarms outputs to be connected to the ACTC.

The AC/DC tasks are:

output supplying all -48V consumers within the BS-240/241 II; input supplying of

230V AC 1 phase system for the world market and 208V AC 2 phase system (208V

phase to phase) for the US market.

supplying external equipment with -48V.

charging and supervising of different battery backup types with different capacities. supervising rectifiers, batteries and alarm messaging.

switching off DC outputs (rectifiers as well as battery) in case of under and over

temperature.

hot plug in/out.

operation of two Frames in parallel.

The AC/DC and the backup batteries work as an Uninterruptable Power Supply System

(UPS).

The nominal DC output power of one AC/DC converter module is:

1600 W for +50C ambient temperature environment (+122F).

Two AC/DC converter modules shall be installed into the AC/DC Frame of the

BS-240/241-II Service1 Rack at least (minimum configuration).

Up to six AC/DC Converters may be installed into the AC/DC Frame depending on the

effective DC power consumption required by the BTSplus subsystem.

3.16.1 DC and Battery Controller (DCBCTRL)

The DC and Battery Controller is the supervision unit for the AC/DC Converters installed

in the Frame AC/DC and for the Batteries charging of this set of AC/DCs.

A serial data link (RS-232) is provided for downloading the DCBCTRL set-up data (likethe nominal battery capacity of the connected battery systems).

3.17 Overvoltage Protection and Tracer (OVPT)

The OVPT is responsible for lightning protection of the PCM24/PCM30 ports of the Abis

interface and the external synchronization clock input of the BS-240/241 II against over

voltage. Additionally, the OVPT provides interfaces to connect PCM tracers without

interruption for monitoring the Abis lines. The OVPT is located outside the EMI shield in

order to terminate possible overvoltages before it enters the EMI protected area inside

the Rack.

The board performs the following tasks: lightning protection of PCM lines


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provision to connect external monitoring equipment without interruption. The lines

are de-coupled by resistors in order to prevent distortions.

supporting 75 coax or 100 /120 balanced lines

for 75 coax only a second version of the OVPT is available

provides grounding facility for the external cable shielding

provides stress relief for the external cables

3.18 Abis Connection Module (ABISCON)

The Abis Connection module provides the interface between the base cabinet and the

peripheral Abis-cables. The Abis Connection module also provides the feature for moni-

toring the Abis lines.

The type of Abis Connector depends on the used cable for the Abis interface symmetrical lines with 100/120 Ohm impedance

coaxial lines 75 Ohm impedance

The ABISCON module can be installed only as alternative to the Over Voltage Protec-

tion and Tracer module (OVPT).

3.19 Abis Link Equipment (LE)

The Link Equipment acts as front end to provide the Abis interface. Different equipment

can be used for wire or radio transmission depending on customer requirements. If a

Link Equipment is available at the telecommunications site, no additional Link Equip-

ment is necessary inside the BTSE. If the BS-240/241 II is installed away from a tele-communications site, the Link Equipment can be installed inside the Service

Rack/Shelter. If radio transmission is required, microwave equipment can be used.

Direct connections of the PCM24/30 links are also possible.

3.20 Cover Parts

All unequipped slots in the Frames of a Rack/Shelter must be equipped with Cover

Parts, to reach a balanced airflow. If the complete Frame is empty, it is not necessary to

cover all the empty slots.

3.21 Backup Battery (BATTERY)The BTS-240/241 II can be equipped with Backup Batteries that have to be installed in

the Service Racks/Shelters only. The backup time of each BTS-240/241 II can be

increased by additional batteries installed in the Service2 rack(s)/shelter(s) and/or using

the feature "Emergency Configuration". When the AC mains breaks down the battery

takes over the supply of the BTESplus. To hold the system in operation mode for an

extended time it is necessary to switch to this configuration after a predefined time

interval. In this operation mode only the TRX configured by the user remains in opera-

tion. All the other TRX(s) of the installed CUs are switched off. The core modules and

the optional transmission equipments are supplied with DC voltage until the backup

battery is disconnected from the system load by the Low Voltage Detection Circuit.

iIn the BS-240/241 II system, the Over-Voltage Protection of the Abis Interface is an

optional feature.


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One frame AC/DC can be connected to two battery systems with two independent

connecting leads. One battery system can consist of up to three battery groups (one

group can consist of up to four batteries) which are always in the same Rack/Shelter due

to temperature control issues.

Fig. 3.7 Example of Battery Backup Systems Connected to the AC/DC

The maximum DC-Output-Power of one Frame AC/DC is limited to 7800W. The

maximum current out of one battery system is limited to 50A (respectively 2400W at

48V). All battery systems connected to frame AC/DC should have the same battery

capacity.

3.22 Fan

The Fan Unit is responsible for creating a sufficient airflow in order to cool the inner elec-

tronics using all the effects of forced convection cooling.

In order to keep both the acoustic noise and the power consumption of all fans at the

lowest level possible, the fan speeds are (independently of each other) temperature

controlled via integrated sensors that monitor the critical hotspots to keep them in an

acceptable range.

Furthermore, each fan delivers a fan good/fan bad signal that is processed by the COBA

board (routed via ACTC board in case of a Base Rack/Shelter or the ACTC board andCAN Bus in case of an Extension-/Service Rack/Shelter).

Mandatory fan units:

Six fan units shall be installed into

- BS-240-II Base Rack,

- BS-240-II Extension Rack,

- BS-241-II Base Shelter

- BS-241-II Extension Shelter.

Two fan units shall be installed into

Battery 0

Base Frame for AC/DC Converter

D

C

B

C

T

R

L

AC

DC

-AC

DC

-AC

DC

-AC

DC

-AC

DC

-AC

DC

-

Battery System 0

DCline

DCline

Battery System 1

Battery 1 Battery 2

Battery 0 Battery 1 Battery 2

M

o

d

u

l

e

M

o

d

u

l

e

M

o

d

u

l

e

M

o

d

u

l

e

M

o

d

u

l

e

M

o

d

u

l

e


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-- BS-240-II Service 1A Rack,

- BS-241-II Service 1A Shelter.

- BS-241-II Service 2 Shelter.

Optional fan units:

Two additional fan units shall be installed into

- BS-240-II Service 1A Rack if more than 6 HU for LE (> 600 W) are provided there.

Two fan units shall be installed into

- BS-240-II Service 2 Rack if any HU for LE is provided there.

Four fan units shall be installed into

- BS-240-II Service 2 Rack if more than 12 HU for LE (> 1 kW) is provided there.


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A30808-X3247-L22-6-7618 45



3.23 Heater Unit

The operating range of the BS-241 II is from 33C to +50C ambient temperature.

The task of the heater is to warm up the BTSEplus, if the temperature inside the shelter

is below the specified operating temperature range of the integrated modules.

The heater is an optional unit. The utilisation of heater unit depends on the climatic

conditions at the BTSE site if low temperature operation is expected.

For ambient temperatures below 5C, each Rack needs one heater unit.

If the heater is faulty, the BTSEplus will operate as long as the temperature inside the

shelter stays within defined operating range. If the temperature falls below the lower

threshold of the defined range, all AC/DC converters will be switched off and the BTSE-

plus Carriers go down. If the internal temperature rises into the defined operating range

again, the system starts automatically with operation.

In case of Shelter:

The membrane filter, and its integral frame which is made of a corrosion resistant mate-

rial, is fitted to the inside of the door to prevent dust particles or water from being drawn

in, and which may accumulate at the exposed exterior. The current design of the filter is

such that an accumulation of particles may reduce the cooling effects but only to a level

within the BTS environmental specification.


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4 Antenna Combiners and Receiving Paths

4.1 Methods of CombiningIn order to serve cells with different carrier numbers, certain combinations of combining

modules are required. These configurations provide the necessary performance in an

effective way.

For the UL (Up Link) path, antenna diversity is always considered. The required splitting

factor only depends on the maximum carrier number per cell without yielding a reason-

able technical penality.

With respect to the DL (Down Link), a trade off exists between the number of antennas

and the insertion loss for a given carrier number. Increasing the antenna number

decreases the DL insertion loss introduced by hybrid combining of Carriers to one

antenna port. For high carrier numbers per cell (5) filter combining becomes advanta-

geous with respect to insertion loss but suffering from incompatibility to synthesizer

frequency hopping.

Nevertheless, for urban sites where the cell sites are usually small a configuration with

a DUAMCO 8:2 supports synthesizer frequency hopping and there is no need for addi-

tional antennas. Fig. 4.1 the different combining options are shown. The relationship

between labels and components is shown in Fig. 2.3.

Fig. 4.1 Overview of Combining Options

2:2

2x

4:2

4x

8:2

8x

TMA

Tower Mounted

2:1

RX

High Power Duplexer

Duplex Combining

Filter Combining

HPDU2:1

TX

8x 8x

2x8 DUBIAS

and BIAS-T

Amplifier


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A30808-X3247-L22-6-7618 47



DUAMCO (Duplexer Amplifier Multicoupler)

The DUAMCO x:y modules contain duplex filters in order to combine the transmit and

receive path to one antenna connector. The receive and transmit part of the duplex filter,

respectively, provide the substantial part of the receive and transmit band filteringrequired by GSM 05.05, 11.21 and JTC J-STD-007.

The receive path consists of a LNA (Low Noise Amplifier) and a power splitter. The LNA

takes care of a low system noise figure and consists of two branches. In case of

malfunction of one amplifier, the RX gain of the DUAMCO decreases by about 6 dB. The

power splitter distributes the received band to the CUs (Carrier Units). A splitting factor

of 4 (or 8 in case of DUAMCO 8:2) is implemented in order to feed 4 (8) CUs.

The DUAMCO amplifier has two different operation modes which can be selected by

e.g. DIP switches. In the following, mode 1 is called AMCO mode and the second mode

is called MUCO mode. In the AMCO mode where no TMA (Tower mounted Amplifier) is

used, the DUAMCO gain is around 19 dB. In case a TMA is used, the DUAMCO is

configured in the MUCO mode. In the MUCO mode, the gain is reduced to about 0 dB.This adjustment is only done once during the installation of the BTSE by the service

personal. The selected mode can be read by O&M SW via CAN bus interface.

The transmit path consists of isolators, a hybrid coupler with load (for some modules)

and an ASU (Antenna Supervision Unit). The isolators have to protect the PAs (Power

Amplifiers) inside the CUs from each other in order to assure the required intermodula-

tion suppression. Two different hybrid couplers (2:1, 4:1) combine up to 4 Carriers to one

antenna. The corresponding not transmitted power is terminated in a load including

cooler. The ASU is responsible for detecting certain reflection factors at the antenna

connector and is connected to the O&M interface.

The O&M interface of the DUAMCO transmits error messages to the BTS core via a

slow O&M bus (CAN bus).

The DUAMCOs x:y are named depending on the number x of transmit connectors fed

by the CUs and the number y of antenna connectors. The following figures show the

different DUAMCOs implemented by a set of equal sub-modules.

The DUAMCOs are implemented for seven different frequency bands: GSM 850,

P-GSM 900, GSM 1800 (DUAMCO 2:2 , DUAMCO 4:2 and DUAMCO 8:2); E-GSM 900,

R-GSM 900, GSM-RE 900, GSM 1900 ( DUAMCO 2:2 and DUAMCO 4:2). The division

of the GSM 900 band (39 MHz) in two interleaved sub-bands (25 MHz each, P-GSM and

GSM-RE) results from the required filter volume for the whole band.(see Tab. 1.2)


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Fig. 4.2 DUAMCO 2:2

Fig. 4.3 DUAMCO 4:2

Rx Tx

ASU

LNA

RXCA to Rx fromTx

Control

CAN

DC interf.

TMA

DC/DC

TMA

Signall.

Rx Tx

ASU

LNA

RXCAto Rx from

Tx

AMCO

MUCO

AMCO

MUCO

LNALNA

bus

BiasTEE

BiasTEE

Module 0 Module 1

Antenna 0 Antenna 1

Antenna 0

Rx Tx

ASU

LNA

RXCAto Rx

fromTx

Control

CAN busDC interf.

TMA

DC/DC

TMASignall.

Rx Tx

LNA

RXCA

to RxfromTx

Antenna 1

Coupler

to/from core

ASU

Coupler

AMCO

MUCO

AMCO

MUCO

LNA LNA

BIASTEE

BIASTEE

Module 0 Module 1


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A30808-X3247-L22-6-7618 49



Fig. 4.4 DUAMCO 8:2

FDUAMCO (Flexible Duplexer Amplifier Multicoupler) / DUAMCO

The FDUAMCO modules contain duplex filters in order to combine the transmit and

receive path to one antenna connector. The receive and transmit part of the duplex filter,

respectively, provide the substantial part of the receive and transmit band filtering

required by GSM 05.05, 11.21 and JTC J-STD-007.

The receive path consists of a LNA (Low Noise Amplifier) and a power splitter. The LNA

ensures a low system noise figure and consists of two branches. In case of malfunction

of one amplifier, the RX gain of the FDUAMCO decreases by about 6 dB. The power

splitter distributes the received band to the carrier units. A splitting factor of 4 is imple-

mented in order to feed up to 4 Carriers. Additionally, the FDUAMCO has a cascade

output.

The FDUAMCO amplifier has two different operation modes which can be selected byDIP switches. One mode is called AMCO mode and the other is called MUCO mode. In

the AMCO mode where no TMA is used, the FDUAMCO gain is around 19 dB. In case

a TMA is used, the FDUAMCO is configured in the MUCO mode. In the MUCO mode,

the gain is reduced to about 0 dB. The exact gain of the FDUAMCO to compensate the

cable losses can be adjusted for this mode with a DIP switch. This adjustment is only

done once during the installation of the BTSE by the service personal. The selected

mode can be read by O&M software via CAN bus interface.

The transmit path consists of isolators, a hybrid coupler depending on jumper setting

and an ASU (Antenna Supervision Unit). The isolators have to protect the PAs (Power

Amplifiers) inside the carrier units from each other in order to assure the required inter-

modulation suppression. By usage of a hybrid coupler up to 4 Carriers are combined toone antenna. The corresponding not transmitted power is terminated in a load including

Rx Tx

ASU

LNA

RXCA

to RxfromTx

Control

CAN busDC interf.

TMA

DC/DC

TMA

Signall.

Rx Tx

LNA

RXCA

to RxfromTx

Coupler

to/from core

ASU

Coupler

AMCO

MUCO

AMCO

MUCO

LNA LNA

BIASTEE

BIASTEE

Module 0 Module 1

Antenna 0 Antenna 1

5/20/2018 38840325 a 13-2-4 Technical Descript

38840325 a 13-2-4 technical description bs241 ii

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