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Base Station System
Technical Description (TED:BSS)BS-240/241 II
A30808-X3247-L22-6-7618
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!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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Technical Description (TED:BSS)BS-240/241 II
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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Technical Description (TED:BSS)BS-240/241 II
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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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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Technical Description (TED:BSS)BS-240/241 II
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
Carriers. RF amplifier and multicoupler for the RX path are integrated
Antenna combining with duplexers (FDUAMCO and COAMCO) can be applied for 8
Carriers. RF amplifier and multicoupler for the RX path are integrated
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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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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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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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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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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Fig. 2.7 Possible Configuration of Service1-Rack
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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
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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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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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InformationBase Station System
Technical Description (TED:BSS)BS-240/241 II
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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Technical Description (TED:BSS)BS-240/241 II
InformationBase Station System
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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Technical Description (TED:BSS)BS-240/241 II
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
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