Siemens BS-240, BS-241 Technical Description

Information

Base Station System
Technical Description (TED:BSS)

BS-240/241

A30808-X3247-L14-2-7618

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

Information

Base 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.
HazardousvoltagesarepresentattheACpowersupplylinesinthiselectricalequipment.Somecomponentsmay
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
Geräte müssen die zutreffenden Sicherheitsbestimmungen erfüllen.
In diesen Anlagen stehen die Netzversorgungsleitungen unter gefährlicher Spannung. Einige Komponenten
können auch eine hohe Betriebstemperatur aufweisen.

Nichtbeachtung der Installations- und Sicherheitshinweise kann zu schweren Körperverletzungen oder
Sachschäden führen.
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 a
Class 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 accor­dance with the relevant standards referenced in the manual “Guide to Documentation”, may cause harmful inter­ference to radio communications.
For system installations it is strictly required to choose all installation sites according to national and local require­ments concerning construction rules and static load capacities of buildings and roofs.
Forallsites,inparticular in residential areas it is mandatory to observe all respectively applicable electromagnetic
field / force (EMF) limits. Otherwise harmful personal interference is possible.

Trademarks:
Alldesignationsused in this document can be trademarks, the use of which bythirdpartiesfor their own purposes

could violate the rights of their owners.

Copyright (C) Siemens AG 2003.

Issued by the Information and Communication Mobile Group
Hofmannstraße 51
D-81359 München

Technical modifications possible.
Technical specifications and features are binding only insofar as
they are specifically and expressly agreed upon in a written contract.

2

A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

Reason for Update

Summary:

Second Edition for Release BR7.0

Details:

Chapter/Section Reason for Update
All New Release BR7.0

Revised Chapter

Issue History

Issue
Number

1 07/2003 First Edition for new Release BR7.0
2 12/2003 Second Edition for Release BR7.0

Date of issue Reason for Update

A30808-X3247-L14-2-7618

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

Information

Base Station System

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A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

This document consists of a total of 70 pages. All pages are issue 2.

Contents

1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1 Main Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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

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

2.1 Board Redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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

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

2.2 Power Amplifier Output Level (typical values) . . . . . . . . . . . . . . . . . . . . . . 18

2.3 Rack Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3 Description of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.1 Core (COBA and COSA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1.1 Core Basis (COBA2P8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.1.2 Core Satellite (COSA6P16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

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

3.4 GMSK Carrier Units (GCU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.5 Duplexer Amplifier Multi Coupler (DUAMCO). . . . . . . . . . . . . . . . . . . . . . . 37

3.6 DI(=2) Amplifier Multi Coupler (DIAMCO). . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.7 Filter Combiner (FICOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.8 Tower Mounted Amplifier (TMA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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

3.10 DC Panel (DCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.11 Alarm Collection Terminal (ACT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.12 AC/DC Converter (AC/DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

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

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

3.14 Abis Connection Module (ABISCON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.15 Abis Link Equipment (LE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.16 Cover Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.17 Backup Battery (BATTERY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.18 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.19 Heat Exchanger (HEX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

A30808-X3247-L14-2-7618

4 Antenna Combiners and Receiving Paths . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.1 Methods of Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.1.1 Typical Combiner Losses (TX path) and Output Power Level . . . . . . . . . . 52

4.1.2 DUAMCO - DIAMCO GAIN (RX Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4.1.3 Parameters of Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . 55

4.1.4 Examples of possible BTSE configurations . . . . . . . . . . . . . . . . . . . . . . . . 57

4.2 Receiving Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.2.1 Antenna diversity techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.2.1.1 Antenna System Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.2.2 Receiver Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

4.3 Transmission Diversity Time Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

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TechnicalDescription(TED:BSS)
BS-240/241

4.3.1 Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

4.4 FCC Issues (for US Market only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

5 Power Supply and Battery Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

5.1 Support of Emergency Operation for 3rd Party BBU System . . . . . . . . . . . 67

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

Information

Base Station System

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A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

Illustrations

Fig. 2.1 BS-240 Indoor Cabinet and BS-241 Outdoor Cabinet (Base Racks) . . 14

Fig. 2.2 Functional Blocks of the BS-240/241. . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

Fig. 2.4 BS-240 Base Rack and 2 Extension Racks. . . . . . . . . . . . . . . . . . . . . . 20

Fig. 2.5 BS-241 Base Rack and 2 Extension Racks. . . . . . . . . . . . . . . . . . . . . . 21

Fig. 2.6 Possible Configuration of Service1 Rack and Service2 Rack . . . . . . . . 22

Fig. 2.7 BS-240/241 fully Equipped with 24 Carriers . . . . . . . . . . . . . . . . . . . . . 23

Fig. 3.1 Backplane Slot Configuration of Core . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Fig. 3.2 COBA2P8 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Fig. 3.3 Structure of ACLK Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Fig. 3.4 COSA6P16 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Fig. 3.5 Carrier Unit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Fig. 3.6 PATRX Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Fig. 3.7 Principal Data Flow on SIPRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Fig. 3.8 EPATRX and ESIPRO Function Block Diagram . . . . . . . . . . . . . . . . . . 34

Fig. 3.9 Data Flow in ESIPRO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Fig. 3.10 Alarm Collection Terminal (ACTM and ACTP). . . . . . . . . . . . . . . . . . . . 40

Fig. 3.11 Example of Battery Backup Systems Connected to the AC/DC . . . . . . 43

Fig. 4.1 Overview of Combining Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Fig. 4.2 DUAMCO 2:2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Fig. 4.3 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Fig. 4.4 DUAMCO 8:2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fig. 4.5 FICOM 8:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Fig. 4.6 DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Fig. 4.7 HPDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Fig. 4.8 Configuration with HPDU, DUBIAS and TMA . . . . . . . . . . . . . . . . . . . . 52

Fig. 4.9 Multi-cell (3,3,2): with 3 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . . 57

Fig. 4.10 Multi-cell (3,3,2): with 2 DUAMCO 4:2 and 1 DUAMCO 2:2 . . . . . . . . . 58

Fig. 4.11 Single-cell (8,0,0): with FICOM and DIAMCO . . . . . . . . . . . . . . . . . . . . 58

Fig. 4.12 Single-cell (8,0,0): with 2 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . 59

Fig. 4.13 Multi-cell (2,2,2): with 3 DUAMCO 2:2. . . . . . . . . . . . . . . . . . . . . . . . . . 59

Fig. 4.14 Single-cell (11...16,0,0): FICOMs, DIAMCOs and HPDUs in 2 Racks. . 60

Fig. 4.15 Capacity Downlink Improvements for TX Diversity . . . . . . . . . . . . . . . . 63

Fig. 4.16 BTS Rack Cabling for Transmitter Diversity Operation . . . . . . . . . . . . . 64

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

Tables

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

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

Tab. 2.1 Power Amplifier Output Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Tab. 3.1 Units and Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Tab. 3.2 GMSK/8PSK Linear Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Tab. 4.1 Insertion loss of DUAMCOs, FICOMs, HPDU and TMA. . . . . . . . . . . . . 52

Tab. 4.2 Parameters of DUAMCO - DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Tab. 4.3 Parameters of 900 MHz Tower Mounted Amplifier. . . . . . . . . . . . . . . . . 55

Tab. 4.4 Parameters of 1800 MHz Tower Mounted Amplifier. . . . . . . . . . . . . . . . 56

Tab. 4.5 Parameters of 900/1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . 57

Tab. 4.6 Maximum RF Power Output Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Tab. 4.7 Maximum RF Power Output Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Information

Base Station System

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A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

1 Introduction

The architecture of BS-240/241 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
doesn’t involve service interruption.The provision of a full spectrum of combining equip­ment allows high power and minimized numberof antennas. High receiversensitivity is
also guaranted.

The modular architecture and the flexible internal structure, enables the BS-240/241 to
provide new 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 primarily consists of:

• Carrier oriented boards called carrier unit (CU),

• Core boards (COSA, COBA) and

• Combining equipment

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9

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

1.1 Main Features

The BS-240/241 is designed for max. 24 carriers in 3 Racks/Shelters plus Service
Racks/Shelters, if needed. The minimum configuration is one Rack or one Shelter with
a Service Rack/Shelter. Service Racks/Shelters can be configured to accommodate
Backup Batteries and Link Equipment. A Service Rack/Shelter can be equipped with
AC/DC Converters. Easy Rack/Shelter Extension is possible with one or two Extension
Racks/Shelters.

The BS-240/241 can be configured for the systems GSM 850, GSM 900, GSM 1800 and
GSM 1900 with the following configurations:
– Single band
– Dualband: GSM 900, GSM 1800; GSM 900, GSM 1900; GSM 850, GSM 1800 and

GSM 850, GSM 1900 :
– GSM 900, GSM 1800 cell mixed frequencies
– Common BCCH channel for GSM 900, GSM 1800 cell (dual band)
– Single cell
– Multi cell

Up to 6 cells per Rack and up to 12 cells can be supported. A special case is the feature
“concentric cell”; one cell with 2 supply areas (inner and complete area). This feature
can be used in omnicells as well as in multicells with sectors.

The following combining options are supported:
– Antenna combining with CU pairs to apply transmission diversity time delay.
– Antennacombining withduplexers(DUAMCO) can be appliedfor 2, 4 and8carriers.

RF amplifier and multicoupler for the RX path are integrated
– Antenna combining with Filter Combiners (FICOM) is possible for up to 8 carriers

onto one TX antenna
– Cascading of multicoupler equipment (DIAMCO) is possible for up to 24 carriers
– High Power Duplexer (HPDU) for reduction of the necessary numbers of antennas

in case of FICOM per cell for up to 8 carriers can be applied
– Every BTSE has core equipment in the Base Rack/Shelter
– Sensitivityis better than GSM requirements at the Rack entry by using DUAMCO or

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

using Tower Mounted Amplifiers (TMA)
– EDGE Carrier Units (ECU)
– Mixed Configurations of Cells/Sectors applying both EDGE Carrier Units (ECU) and

“normal” Carrier Units (CU)
Traffic Channels:

– Full-Rate (FR)
– Half-Rate (HR)
– Enhanced Full-Rate (EFR)
– Adaptive Multi Rate Codec (AMR)

Services:
– GPRS
– HSCSD
– EDGE

Frequency Hopping:
– Baseband
– Synthesizer

Information

Base Station System

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A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

Redundancy:
– SW Support of Core Redundancy
– SW Support of BCCH Redundancy
– AC/DC n+1 redundancy. (n+1) AC/DCConverterswork in load sharing, butn AC/DC

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

Abis interface:
– Enhanced Full-Rate TCH
– Full-Rate and Half-Rate TCH
– AMR TCH
– Submultiplexing4x16kbit/s onto one 64 kbit/s timeslot for handling Full-Rate TCH

on Um interface

– Handling of 4x(2x8) kbit/s onto one64 kbit/s timeslot for half-rate TCH on Uminter-

face

– Drop and insert feature on 2 Mbit/s (E1) and 1.5 Mbit/s (T1) links is available on a

16 kbit/s and a 64 kbit/s basis
– Star, loop and multidrop chain connections
– Cross connect function
– Change of PCM line configuration from star to multidrop or loop and vice versa is

possible without any interruption of service
– Multiple Abis LAPD links; load sharing and LAPD fault recovery
– External clock synchronisation
– Over-Voltage Protection with OVPT

Abis link media:
– Wire
– Fiber optic
– Micro-Wave

Fault procedures:
– Automatic Recovery procedure of faulty objects in BTS
– Online RF Loopback

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

1.2 Technical Data

The BS-240/241 family with 24 transceivers can be supplied in the following versions:
– A BS-240 for indoor installation.
– A BS-241 for outdoor installation (also equipped with: integrated power supply,

battery, microwave equipment, integrated link equipment, heat exchangerand cross
connector).
BS-240/241 consist in a split BTS architecture, with:

- 1 Base Rack

- Up to 2 Extension Racks

- Up to 2 Service Racks (Service1 or Service2).

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

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

Information

Base Station System

Dimensions (mm) (HxWxD) 1600x600x450 (5’3”x2’x1’6”) 1750x700x650 (5’9”x2’4”x2’2”)
(Base Racks) (incl. Plinth)
Volume net 432 l 705 l

796 l (incl. Plinth)
Maximum power consumption 1600 W 1750 W
Weight of Basic Rack empty ca.60 kg (132 Lbs) ca.60 kg (132 Lbs)
Weight of Shelter empty ca.110 kg (242 Lbs)
Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)

- 1 Frame for Battery incl. 1Battery (48V / 85 Ah) (ca. 140 kg/309
Lbs)

-1 Mounting Kitfor Link Equipmentincl. 1 Frame NTPM, Frame for
Fan Unit and two FAN's (ca. 16 kg/ 35 Lbs)

- 1 Rack (ca. 60 kg/132 Lbs)
Sum: ca. 243 kg (536 Lbs)

Weight of Service1 Rack equipped with: - 2 Frames AC/DC and

- 2 Frames for Battery
Not possible: max. 3 Frames pro Rack / Shelter can be equipped.

Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)

-1 Mounting Kitfor Link Equipmentincl. 2 Frame NTPM, Frame for
Fan Unit and two FAN's (ca. 21 kg/46 Lbs)

- 1 Rack (ca. 60kg/132 Lbs)
Sum: ca. 108 kg (238 Lbs)

Weight of Frame: Frame with Battery ca. 140 kg (309 Lbs)

FrameAC/DC with 6 AC/DC Modules ca. 27 kg (60 Lbs)
Frame with 4 CU's and 2 MUCO's ca. 40 kg (88 Lbs)
Frame with 4 ACOM's ca. 40 kg (88 Lbs))
1 HEX ca. 5.6 kg (12 Lbs)

Tab. 1.1 Technical Data

12

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Information
Base Station System

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

Technical Description (TED:BSS)

BS-240/241

Temperature range (˚C) -5 °C to +55 °C

+23 °F to +131 °F

Tab. 1.1 Technical Data

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
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

-45 °C to +50 °C

-49 °F to +122 °F

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

2 Hardware Architecture

The BS-240/241 is designed to achieve commonality of boards to serve both GSM 850,
GSM 900 with its different deviates (GSM 1800, GSM 1900) and standards selected for
mobile communication systems. Moreover, the architecture of BS-240/241 provides
maximum flexibility to develop large and small BTSs which havesimilar costs per TRX.

Fig. 2.1 shows the Base Rack Cabinets.

Information

Base Station System

Fig. 2.1 BS-240 Indoor Cabinet and BS-241 Outdoor Cabinet (Base Racks)

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

14

A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

Cell 0

Cell 1

Cell 1

TMA

TMA

TMA

DUBIAS

TMA

Base Rack

DUAMCO

H
P
D
U

RXCA0

FICOM

DIAMCO

FICOM

4xTX

RX

RXDIV

4xTX

RX

RXCA1

RXDIV

4xTX

RXDIV

RX

CU 0

CU 7

CU 0

CC-Links

ACTC

2 PCM

COBA

COSA

FAN

Ext. Sync.

2 PCM

4 PCM

to next ext. rack

*

ACTM

DCP

Extension Rack

O
V
P

O
V
P

T

T

Abis

Sync.

Abis

4xTX

Cascading

DIAMCO

RX

RXDIV

RX

RXDIV

CU 7

Service Rack

ACP

AC/DC

DCB­CTRL

BATTERY

AC/DC

DCB­CTRL

BATTERY

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

FAN

FAN

CAN BUS

*

DCP

*

ACTC

LE 0

ACTC

ACTP

DCP

LE 1

ACTP

Fig. 2.2 Functional Blocks of the BS-240/241

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

AC/DC AC/DC converter DCBCTRL DC and Battery Controller
ACP AC Panel DCP DC Panel
ACTC Alarm Collection Terminal Connection module DIAMCO DI(2) Amplifier Multi Coupler
ACTM Optional Alarm Collection Terminal for Master Rack DUAMCO Duplex Amplifier Multicoupler
ACTP Alarm Collection Terminal for Slave Rack FICOM Filter Combiner
CAN Controller Area Network HPDU High Power Duplexer
COBA Core Basis (COBA2P8) LE Link Equipment
COSA Core Satellite (COSA6P16) TMA Tower Mounted Amplifier
CU Carrier Unit

The architecture of BS-240/241 provides maximum flexibility to develop large and small
BTSs.

The BS-240/241 mainly consists of:
– carrier oriented boards called carrier unit (CU),
– core boards (COSA, COBA) and
– combining equipment

Up to 8PCM linescan beconnected to the core boards. In order to provide cost effective
solutions, the core boards are scalable (COBA, COSA). In addition, also the BTS itself
is scalable. It is possible to connect up to 2 Extension Racks to a Base Rack.

The main communication between the modules is provided by means of bi-directional
serial link communications between the carrier units (CU) and the core boards. The
serial link also provides an effective means to realize baseband frequency hopping.
Despite the fact that synchronization information is also transported via the serial links,
no differential length constraints apply for the lines of the serial link.

All alarms, beside the alarms that are generated in the core and in the CU boards, are
transported via theCAN bus. Alarms of the CU boards are transmitted via CC-Link.Core
boards use their interface bus.

The carrier unit(s) provide all analog and digital signal processing including a RF power
stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter­face with the combining equipment on the one side and with the core modules on the
other. The core boards provide functions common to all carriers within the BS-240/241
(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different
carriers.

Base Station System

Information

16

A30808-X3247-L14-2-7618

Information
Base Station System

2.1 Board Redundancy

2.1.1 AC/DC

2.1.2 Core

Technical Description (TED:BSS)

BS-240/241

Redundancy in the SBS ensures survival of the system even in the event of multiple fail­ures. Modular architecture, in conjunction with the concept of split functions, guarantees
maximum survivability with a minimum of additional hardware.

Up to 6 AC/DC converters 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.

The Core can consist of up to 2 (without redundancy) or up to 4 (with redundancy)
boards, which have a common backplane. The block diagram depicts the 2n CORE
redundancy and the embedding of the active and the passive CORE into the BTS, and
the interrelation of both COREs.

CU

SELIC

SELIC

BISON

FALC

ABIS

CAN

LMT

Fig. 2.3 Redundant COREs and their Interfaces

Both COREs (COBA0/COSA0 and COBA1/COSA1) have link interfaces to the ABIS
lines, but only one (the active CORE) can be connected.

On the backplane of the BTS, one connector provides a link of the LMT to the current
active CORE. In the case of a CORE switch over, the switch logic switches that
connector to the new active CORE. The same holds for the CAN bus (alarm bus), i.e.,
both COREs have the same CAN bus address where at any time at most one CORE is
an active CAN bus node.

Both the active and the passive CORE have links to the carrier units (CU); in reverse,
each CU is linked with both COREs. The traffic data are transmitted transparently
through the active CORE. Signal processing takes place only within the CUs.

The endpoints of each link are built up by SELIC ASICs (note: one SELIC contains
double functionality), where on the CU, one SELICserves two COREs. In thecase of a

SELIC SELIC SELIC

RD
Interf.

µP

Switch

Logic

Route Clock

CLK

CORE 0

CU

SELIC

Redundancy Link

Switch Logic Link

Route Clock

(Frame Sync)

RD

Interf.

Switch

Logic

CLK

SELICSELIC

µP

Route Clock

CORE 1

CU

SELIC

BISON

FALC

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

switch over, the SELICs on the active CORE are disabled by the switch logic and the
SELICs on the passive one are enabled. The SELICs on the CORE have to know
whether they are on the active or on the passive CORE. For this reason the SELICs
need a active/passive pin, which is served by the redundancy switch logic. When a
switch over occurs, the switch logic sets the active/passive pin of the former active
SELICs to "passive" and that of the former passive SELICs to "active".

The SELICs on the CUs have to recognize automatically which link comes from the
active CORE and which link from the passive one, i.e. it has to recognise a CORE switch
over by itself.

The RD interface (redundancy interface) is realized as a 2 Mbit/s HDLC link which
provides a communication interface between the two main processors (mP).

The switch logic is a flip-flop distributed over the two COREs. It manages the HW part
of a switch over and enables the COREs to know about their states as active/passive.

The 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.

Information

Base Station System

2.2 Power Amplifier Output Level (typical values)

Modulation Output Power

(dBm)

GSM 900 CUGV3 GMSK 47.3 53.7
GSM 900 CUGV4 GMSK 47.3 53.7
GSM 1800 CUDV3 / CUDV4 GMSK 45.7 37.1
GSM 1900 CUPV4 GMSK 45.7 37.1

GSM 900 GCUGV2 GMSK 47.3 53.7
GSM 1800 GCUDV2 GMSK 47.3 53.7

GSM 850 ECU 850 HPV2 GMSK 48.3 67.6
“ “ “ “ 8PSK 46.3 42.7
GSM 850 ECU 850 V3 GMSK 48.3 67.6
“ “ “ “ 8PSK 46.3 42.7
GSM 900 ECU GV3 GMSK 48.3 67.6

Output Power

(Watt)

“ “ “ “ 8PSK 46.3 42.7
GSM 1800 ECU DV2 GMSK 47.3 53.7
“ “ “ “ 8PSK 45.3 33.9
GSM 1800 ECU DHPV3 GMSK 48.3 67.6

Tab. 2.1 Power Amplifier Output Level

18

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Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

“ “ “ “ 8PSK 45.3 33.9
GSM 1900 ECU PV2 GMSK 47.3 53.7
“ “ “ “ 8PSK 45.3 33.9
GSM 1900 ECU PHPV2 GMSK 48.3 67.6
“ “ “ “ 8PSK 45.3 33.9
GSM 1900 ECU PHPV3 GMSK 48.3 67.6
“ “ “ “ 8PSK 45.3 33.9

Tab. 2.1 Power Amplifier Output Level

Carrier Unit (CU )

GSM 900: minimum guaranteed output power CU = 50 Watt tolerance value: 47.0 dBm

i

- 47.6 dBm (50 W - 57.5 W); GSM1800, GSM1900: minimumguaranteed outputpower
CU = 34 Watt tolerance value: 45.3 dBm - 46.0 dBm (34 W - 39.5 W).
The mentioned data are guaranteed from Module Factory Test only. The typical output
power at CU output is for:
GSM 900: 47,3 dBm GSM 1800: 45.7 dBm
To verify the typical output power values in fieldmeasurements, the tolerance value of
the used measurement equipment, environmental conditions and GSM 05.05 specifica­tions have to be considered.

Modulation Output Power

(dBm)

Output Power

(Watt)

Carrier Unit (GCU )

GSM 900: minimum guaranteed output power GCU = 50 Watt (GSMK); GSM 1800:

i

minimum guaranteed output power GCU = 50 Watt (GSMK).
The GSM 1800 variant of the GCU V2 offers higher output power than the correspond­ing CU (about 15 Watt): the increased output power of the GSM 1800 GCU V2,
has to be taken into consideration in the radio network planning.

EDGE Carrier Unit (ECU )

GSM 850, GSM 900: minimum guaranteed output power ECU = 63 Watt (GMSK) / 40

i

Watt (8PSK); GSM 1800, GSM 1900: minimum guaranteed output power ECU = 50
Watt (GMSK) / 32 Watt (8PSK).
The mentioned data are guaranteed from Module Factory Test only.

2.3 Rack Configuration

The BS-240/241 family, with 8 transceivers per Rack, which is expandable up to 24
transceivers in 3 Racks and can be supplied in two versions:
– a BS-240 for indoor installation, and
– a BS-241 for outdoor installation (also equipped with integrated link equipment,

Battery Backup and a cooling system).

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

There are 4 different types of Rack:
– Base Rack/Shelter (with Core modules)
– Extension Rack/Shelter (for more then 8 CU’s)
– 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. 2.4 and Fig. 2.5:

Information

Base Station System

SIEMENS

ACOM

0

CU
2

CU
0

FAN 0

ACOM

FAN 2

CU
3

FAN 4 *

CU

1

1

ACOM

MUCO 1

MUCO 0

1

0

0

DC-PANEL

ACT-C

FAN 1

ACOM

2

FAN 3

CU

6

FAN 5*

CU
4

1

3

CU
7

CU

BS-240

5

SIEMENS

ACOM

0

CU
2

CU

0

FAN 0

FAN 2

CU
3

FAN 4*

CU
1

ACOM

1

ACOM

0

MUCO

DC-PANEL

ACT-C

FAN 1

ACOM

2

FAN 3

CU

1

6

MUCO

FAN 5*

CU

4

3

BS-240

CU
7

CU
5

SIEMENS

ACOM

0

CU
2

CU

0

FAN 0

FAN 2

CU

3

FAN 4*

CU

1

ACOM

1

ACOM

0

MUCO

DC-PANEL

ACT-C

FAN 1

ACOM

2

FAN 3

CU

1

6

MUCO

FAN 5*

CU
4

BS-240

3

CU
7

CU

5

COSA

COBA

COSA

COBA

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

Fig. 2.4 BS-240 Base Rack and 2 Extension Racks

20

A30808-X3247-L14-2-7618

Information
Base Station System

Technical Description (TED:BSS)

BS-240/241

SIEMENS

CU
0

CU

2

ACOM

0

FAN 0

CU
1

FAN 2

CU
3

FAN 4*

ACOM

1

1

0

0

COBA

COSA

COBA

MUCO 0

ACOM

DC-PANEL

ACT-C

FAN 1

CU
4

1

COSA

FAN 3

CU

6

MUCO 1

FAN 5*

ACOM

2

CU
5

CU
7

3

BS-241

SIEMENS

CU

0

CU
2

ACOM

0

FAN 0

CU
1

FAN 2

CU

3

FAN 4*

ACOM

1

DC-PANEL

MUCO 1

MUCO 0

ACOM

2

ACT-C

FAN 1

CU
4

FAN 3

CU

6

FAN 5*

ACOM

CU
5

CU
7

3

BS-241

SIEMENS

CU
0

CU

2

ACOM

0

FAN 0

CU
1

FAN 2

CU

3

FAN 4*

ACOM

1

DC-PANEL

MUCO 1

MUCO 0

ACOM

2

ACT-C

FAN 1

CU
4

FAN 3

CU

6

FAN 5*

ACOM

BS-241

CU
5

CU
7

3

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

Fig. 2.5 BS-241 Base Rack and 2 Extension Racks

Fig. 2.7 shows the max possible configurations. The Base Rack and the Extension

Racks can be located physically in any position.
The Service Rack (see Fig. 2.6 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.

All AC/DC frames are housed in the same Service Rack thus there are two basic kinds
of the Service Rack, one being connected to the AC mains (Service1 Rack) and one
being connected to DC only (Service2 Rack).

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