03 Mn1780eu09mn 0001 Btsplus Architecture

BTSplus Architecture Siemens

MN1780EU09MN_0001 © 2001 Siemens AG

1

Contents

1 Overview 3

1.1 Introduction 6

1.2 Key Features 10

2 Architecture 13

2.1 Functional Structure 18

2.2 Modules 20

2.3 Rack Layout, Rack Extension and Service Racks 38

2.4 Rack Extension and Numbering 42

2.5 Power Supply 44

2.6 Compatibility 46

2.7 Comparison between BS2x/6x and BS24x Modules 46

2.8 EDGE Carrier Unit 46

3 Configuration Examples 48

3.1 Two Cells 48

3.2 Three Cells 49

3.3 Six Cells 49

4 BS240XL Details 51

4.1 Overview 52

4.2 Affected Modules 53

4.3 BS240XL Configuration Examples 54

5 Technical Data 59

6 Exercises 61

BTSplus Architecture

Siemens BTSplus Architecture

MN1780EU09MN_0001

© 2001 Siemens AG

2



3

1 Overview

Fig. 1 BS240 Base Rack (left) and BS241 Base Shelter (right)


MN1780EU09MN_0001

© 2001 Siemens AG

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Fig. 2 BS240XL (Base Rack)



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Fig. 3 BS40 Rack (left) and BS41 Shelter (right)


MN1780EU09MN_0001

© 2001 Siemens AG

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1.1 Introduction

Beside the e-MicroBTS and the picoBTS, the new BTSplus family of base stations includes

��BS240/241 with max. 24 TRX in 3 (carrier) racks,

��BS40/41 as an "all-in-one" base station with max 4 TRX in a single rack and

��BS240XL providing 24 TRX in 2 (carrier) racks only.

Dual band operation for these base stations in the GSM900 and GSM1800/GSM1900 frequency bands is possible.

Filter and duplex combiners offer high output power and a minimized number of antennas, respectively. A TMA (tower mounted amplifier) for highest receiver sensitivity is available.

All BTSplus base stations offer GPRS (General Packet Radio Service) and are prepared for EDGE (Enhanced Data Rates for GSM Evolution).



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1,5

5 m

air in let air in let



CU CU CU CU

CU CUCU CU

CBONONONONONON ONONONONONONFP

BS-241

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

DIAMCO

DIAMCO

s

Plinth

0,2

m

1,6

0 m

a ir in le t a ir in le t



C U C U C U CU

CU CUC U C U

CBO NO NO NO NO NON O NO NO NO NO NO NFP

B S -240

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

DIAMCO

DIAMCO

s

Fig. 4 Layout for BS240 Base Rack (left) and BS241 Base Shelter (right)


MN1780EU09MN_0001

© 2001 Siemens AG

8

2025 m

m

C

O

B

A

C

O

S

A

C

O

B

A

C

O

S

A

air inlet air inlet

CU CU CU CU

DIAMCO

DIAMCO

air inlet air inlet

CU CU CU CU

air inlet air inlet

CBFP

BS-240XL

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

ON

ON ON

ON ON ON

ONON ON

ON ON

ON

air inlet air inlet

CU CU CU CU

DIAMCO

DIAMCO

Fig. 5 Layout for BS240XL (indoors only)



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1.6

0 m

air inlet air inlet

CU

A

C

O

M

A

C

O

M DIAMCO Standard

Battery

Module

CBFP

BS-40

ON

ON ON

ON ON ON

ONON ON

ON ON

ON

CU CU CU

C

O

B

A

air inlet air inlet

AC/DC

AC-P

anel

air inlet air inlet

C

O

S

A

C

O

B

A

C

O

S

A

AC/DC

AC/DC

µWave (2HU)

1.7

5 m

A

C

O

M

A

C

O

M DIAMCO

Standard

Battery

Module

air inlet air inlet

CBFP

BS-41

ON

ON ON

ON ON ON

ONON ON

ON ON

ON

CU CU CU CU

C

O

B

A

C

O

S

A

C

O

B

A

C

O

S

A

AC/DC

AC-P

anel

AC/DC

AC/DC

air inlet air inlet

µWave (2HU)

air inlet air inlet

Plinth

Fig. 6 Layout for BS40 (left) and BS41 (right)


MN1780EU09MN_0001

© 2001 Siemens AG

10

1.2 Key Features

The BS24x/BS4x key features are:

��Compatibility with SBS on Abis interface, i.e. full integration in existing multidrop or loop configurations

��Frequency bands: GSM900 (P, E, R, RE, PS bands), GSM1800, GSM1900

��Dual Band GSM900/1800/1900 in the same rack

��Rack extension for BS240/241 and BS240XL: (max.) 24 TRX/site, 24 TRX/cell, 6 cells/rack, 12 cells/site

��BS40/41 up to 3 / 4 cells (with / without diversity)

��Carrier Units with 50 W output power for GSM900

��Carrier Units with 35 W output power for GSM1800/1900

��Up to -116 dBm Rx sensitivity

��Core redundancy, AC/DC (n+1) redundancy, BCCH reconfiguration

��Filter and duplex combiners

��Antenna diversity

��Tower Mounted Amplifier TMA

��Integrated Abis cross-connect (on 64 kbit/s level)

��Space for integration of NTPM and microwave equipment

��Battery backup (in service rack, integrated in BS4x)

��up to 57 external alarms (per rack)

��Temperature range: -5ºC...+55ºC indoor

Temperature range: -45ºC...+50ºC outdoor

��High site efficiency (especially BS240XL)

��Service racks

��Rack extension without service interruption

��Hot plug-in of modules

��Frequency hopping (base band and synthesizer hopping)



11

GSM Variant Frequency Band

Uplink (MHz)

Frequency Band

Downlink (MHz)

GSM900 “Primary” 890 - 915 935 - 960

GSM900 “Extended” 880 - 915 925 - 960

GSM900 “Railway” 876 - 915 921 - 960

GSM900 RE 876 - 901 921 - 946

GSM900 PS 880 – 905 925 - 950

GSM1800 ("DCS") 1710 – 1785 1805 - 1880

GSM1900 ("PCS") 1850 – 1910 1930 - 1990


MN1780EU09MN_0001

© 2001 Siemens AG

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13

2 Architecture


MN1780EU09MN_0001

© 2001 Siemens AG

14

The BS24x / 4x serves both GSM900 and its variants (GSM1800 / GSM1900). Moreover, the BS24x is the basis from which the Enhanced-MicroBTS and the picoBTS are derived (BTSplus family).

The main BTSplus components are

��core boards (COBA/COSA),

��carrier-oriented boards called carrier units (CU) and

��combining equipment (DUAMCO, FICOM, and DIAMCO).

Up to 8 PCM lines can be connected to the two core boards. The BTSE itself is scalable: Up to two (one) extension racks carrying radio equipment may be connected to a BS24x (BS240XL) base rack.

The main communication between the modules runs via a bi-directional serial link between the carrier units and the core boards (CC-Link). The serial link is also used for base band frequency hopping. All non-CU boards (e.g. DUAMCO) report their alarms to COBA via the CAN bus. Alarms of the CU boards are transmitted via CC-Link.



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1,6

0 m

air in let air inlet

a ir in let air inlet

a ir in let air inlet

CU CU CU CU

CU CUCU CU

CBONONONONONON ONONONONONONFP

BS-240

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

DIAMCO

DIAMCO

s

Fig. 7 BS240 Base Rack


MN1780EU09MN_0001

© 2001 Siemens AG

16

2025 m

m

C

O

B

A

C

O

S

A

C

O

B

A

C

O

S

A

air inlet air inlet

CU CU CU CU

DIAMCO

DIAMCO

air inlet air inlet

CU CU CU CU

air inlet air inlet

CBFP

BS-240XL

A

C

O

M

A

C

O

M

A

C

O

M

A

C

O

M

ON

ON ON

ON ON ON

ONON ON

ON ON

ON

air inlet air inlet

CU CU CU CU

DIAMCO

DIAMCO

Fig. 8 BS240XL Base Rack



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1.6

0 m

air inlet air inlet

CU

A

C

O

M

A

C

O

M DIAMCO Standard

Battery

Module

CBFP

BS-40

ON

ON ON

ON ON ON

ONON ON

ON ON

ON

CU CU CU

C

O

B

A

air inlet air inlet

AC/DC

AC-Panel

air inlet air inlet

C

O

S

A

C

O

B

A

C

O

S

A

AC/DC

AC/DC

µWave (2HU)

Fig. 9 BS40 Base Rack


MN1780EU09MN_0001

© 2001 Siemens AG

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2.1 Functional Structure

COBA

OVPT

OVPT

4 x Abis

4 x Abis

48 Site Inputs

CC-Links

-48 V

ACTP

LE 0 LE 1

230 V AC

CAN-BUS

Alarms

TX

RX

RXDIV

TMA

TMA

RX

RXDIV

DUAMCO

DIAMCO

FICOM

CU 0CC

CU 7CC

CU 0

CU 7

2 PCM

2 PCM

4 PCM

RXCA 0

DIAMCO

RXCA 1

FICOM

RX

RXDIV

TX

RX

RXDIV

ANT 0

Cascading

to

next

Ext. Rack

CC-Links

ANT 1

ANT 0

ANT 1

ANT 1

Cell 0

Cell 1

Cell 1

Cell 1

COSA

1 x Ext. Sync. CLK

FAN DCP

ACTM

-48 V

16 AL

TempDoor

ACTCDoor

Temp

FAN-48 V

ACTP

DCP

DCB-CTRL

DCB-CTRL

Alarms

ACTCDoor

Temp

AC/DC AC/DC

ACP

FAN

Fan

-48 V

230 V AC

DCP

Fan

CAN-BUS

CAN-BUS

Extension Rack / Shelter

Service Rack / Shelter

Base Rack / Shelter

ACTC

Alarms

Battery Battery

Ext. Sync.

H

P

D

U

ANT 0

Fig. 10 Functional structure of BS24x



19

COBA

OVPT

OVPT

4 x Abis

4 x Abis

48 Site Inputs

8 Site Outputs

ACTP

LE 0 LE 1

CAN-BUS

TX

RX

RXDIV

TMA

TMA

RX

RXDIV

DUAMCO

DIAMCO

FICOM

CU 0CC

CU 2CC

2 PCM

2 PCM

4 PCM

TX

RX

RXDIV

ANT 0

ANT 1

ANT 1

Cell 0

Cell 1

Cell 1

COSA

1 x Ext.

Sync. CLK

FAN

ACTM

16 AL

TempDoor

DCB-

CTRL

Alarms

ACTCDoor

Temp

FAN

Fan

Service Rack / Shelter

Base Rack / Shelter

-48 V

DCP

ACTC

Alarms

Battery

Ext. Sync.

H

P

D

U

ANT 0

DCP

Battery230 V AC

AC/DC ACP

230 V AC

- 48 V

Fig. 11 Functional structure of BS4x


MN1780EU09MN_0001

© 2001 Siemens AG

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2.2 Modules

2.2.1 Carrier Unit

The carrier unit CU contains all analog and digital signal processing units (including a RF power stage) to provide a single GSM / EDGE carrier (with 8 time slots). The carrier unit interfaces to the combining equipment (via semi-rigid cabling) and to the core modules (via CC-Link).

Frequency Range Output power (W)

GSM900 50

GSM1800 35

GSM1900 35

The carrier unit is composed of the following units:

Power Amplifier and Transceiver Unit PATRX provides the main analogue functions of the CU. In uplink direction two (diversity) pre-amplified and filtered RF signals are received from the antenna combining equipment. These signals are converted to IF and channel filtered. The IF signals are then transmitted to SIPRO, where they are sampled and digitally converted to base band.

In downlink direction the GMSK modulated signal is received from the SIPRO, I/Q modulated and converted. The resulting RF-signal is then power amplified and transmitted to the antenna combining equipment.

PATRX supports synthesizer frequency hopping.

The power control loop implements 6 static power steps (each 2 dB, BSC database) and additional 15 dynamic power levels (each 2 dB).

Power Supply Unit PSU is the DC/DC converter for the CU. The PSU generates the voltages +26/28V, +6V (only GSM1800/GSM1900), +12V, +5.3V and -5.3V for the analogue circuitry and +3.35V for the digital circuitry from a -48V primary input voltage.

The SIPRO performs

��digital to analogue conversion (and back)

��(local) clock supply

�� Signal processing in uplink and downlink (encoding, ciphering, interleaving, burst formation)

�� Control of RF on PATRX

�� Base band and synthesizer hopping

�� Radio link and channel control

�� O&M functions (incl. CC-Link handling)



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PATRX SIPRO

PSU

RX input

TX output

CC Link

-48V

CU

Fig. 12 Carrier Unit structure


MN1780EU09MN_0001

© 2001 Siemens AG

22

2.2.2 Core Base / Core Satellite

The main functions of Core Base COBA and Core Satellite COSA are:

��local control of entire BTSE

��generation of system clock

��providing max 8 Abis interfaces to BSC and other BTSE

��routing Abis data to max 24 CU

��providing T-interface to LMT

��handling and processing of O&M messages

COBA stores the BTSE SW on Flash-EPROM, supervises the SW download and terminates all internal system alarms. Beside the O&M functions (LPDLM) the COBA handles the signaling messages between BSC (Abis) and CU (LPDLR). COBA can be expanded with the core satellite COSA board.

COBA supports max 2 PCM30/PCM24 interfaces and 8 CU. COSA is required for expanding the BTSplus capacity with an additional 6 Abis and 16 CU. The cabling between Abis OVPT and CU and the core unit is done via the backplane.

For core redundancy, the COBA and its satellite are duplicated. In this case one of the board pairs (COBA+COSA) is active, working as the master. The other pair has inactive/(cold) standby status. COBA controls the switchover between active and inactive boards.

Central boards can be hot-plugged; i.e. there is no need to switch off power first. Note: COBA can only be removed after COSA has been removed first (mechanical provision).

COSA provides

��6 PCM30/24 interfaces for Abis,

��16 CU interfaces,

��Cross-connect functionality.

COSA is controlled from the COBA via the satellite interface.

The key element of the PCM30/24 interface is the FALC (Framing and Line Interface Component). The FALC performs

��analogue receive and transmit circuitry,

��data and clock recovery,

��frame alignment/synthesis,

��line supervision.

Other essential components are SELIC (Serial Link Interface Controller) and BISON (Bit-Switch for Optimized Network Architecture, between SELIC and FALC).

Between port pairs (0 and 1, 2 and 3 etc.) relays short-circuit the ports of the same pair in case of failure.



23

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 x Abis

PCM24/30

6 x Abis

PCM24/30

8 x CCLinks

to CU

16 x CCLinks

to CU

CC-Link

Clock

Core - CPU

Redund. Logic

Abis-Link

COBACOSA

Interfaces

Alarms

Abis-Link

CC-Link

LMT

Fig. 13 Structure of COBA/COSA


MN1780EU09MN_0001

© 2001 Siemens AG

24

2.2.3 Combining Configurations

For downlink transmission, there is a trade-off between the number of antennae and the insertion loss for a given number of carriers: Increasing the number of antennae decreases the DL insertion loss.

When there are many carriers per cell, filter combining becomes advantageous with respect to insertion loss. However, filter combiners are more expensive than duplex combiners and do not support synthesizer frequency hopping.

When insertion losses are unimportant, e.g. in micro cells, a configuration with DUAMCO 8:2 minimizes cost (incl. the number of antennae) and also supports synthesizer frequency hopping.

8:22:2 4:22x 4x 8x

Duplex Combining: DUAMCO

Tower Mounted

Amplifier (opt.)TMA

2:1 2:1

FICOM

2x8

8x 8x

DIAMCO

Filter Combining

HPDU

High Power

Duplexer (opt.)

Fig. 14 Combining options - overview



25

2.2.4 Combining Modules

2.2.4.1 Duplexer Amplifier Multicoupler DUAMCO

Antenna #0

Rx Tx

LNAASU

Coupler

Control

CAN bus

DC i / f

to/from corefrom

Tx

Rx Tx

LNA

ASU

Coupler

to Rx

Antenna #1

from

Txto Rx

ESN

RXCA RXCA

Triplexer Triplexer

TMA

DC/DC

TMA

Signall.

DUAMCO 4:2

Fig. 15 DUAMCO 4:2

DU AM CO 8:2

CTRLDC O&M

C A N-B us-48V

Module 0 Module 1

Antenna # 0

RXCA

0

TX

0

TX

1

RX

0

RX

1

RX

2

RX

3

Coup ler

RX

4

RX

5

RX

6

RX

7

TX

2

TX

3

LNA

LNA

Mode

AMCO

MUCO

RX TX

Triplexer

ASU

TMADC + Sign.

Antenna #1

RXCA

1

TX

0

TX

1

RX

0

RX

1

RX

2

RX

3

RX

4

RX

5

RX

6

RX

7

TX

2

TX

3

Coup ler

LNA

LNA

Mode

AMCO

MUCO

RX TX

ASU

Triplexer

Fig. 16 Internal structure of DUAMCO 8:2


MN1780EU09MN_0001

© 2001 Siemens AG

26

The DUAMCO x:y are named according to the number x (x=2, 4, 8) of transmit connectors fed by the CU and the number y (always y=2) of antenna connectors.

The DUAMCO contain duplexers for routing both transmit and receive path over the same antenna. In addition, there are filters for transmit and receive signal.

All DUAMCO are composed of two independent sub-modules operating in the same frequency band (but which can be assigned to different cells).

The receive path consists of a LNA (Low Noise Amplifier) and a power splitter. The LNA provides for a low system noise and consists of two branches (for redundancy). 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 carrier units (splitting factors 2, 4 and 8 are available, depending on the type of DUAMCO).

The transmit path contains isolators, a hybrid coupler (with heat sink) and an ASU (Antenna Supervision Unit, for measuring the Voltage Standing Wave Ratio VSWR). The isolators have to protect the power amplifiers inside the CU from each other i. e. they provide the required inter-modulation suppression. Two different hybrid couplers (2:1, 4:1) combine up to 4 carriers to one antenna. The power, which is not transmitted, is terminated in a load including cooler. The O&M interface of the DUAMCO transmits error messages to the BTSE core via the CAN bus.

The Antenna Supervision Units measure the amount of reflection on the antenna cable, the Voltage Standing Wave Ratio VSWR. Three ranges are distinguished:

��VSWR<2: normal operation

��2<VSWR<3: warning "antenna not adjusted"

��3<VSWR: alarm "antenna faulty"

For "antenna faulty", a red LED on DUAMCO is lit and the connected CU modules are switched off automatically.

For Operation & Maintenance, the DUAMCO building blocks ("managed objects")

��antenna supervision DUVSWR,

��low noise amplifier DULNA and

��TMA remote power supply DUDCTMA

are fixedly assigned to the respective plug-in position (" ACOM slot"):

ACOM Slot No. DUVSWR No. DULNA DUDCTMA

0 0, 1 0, 1 0, 1

1 2, 3 2, 3 2, 3

2 4, 5 4, 5 4, 5

3 6, 7 6, 7 6, 7



27

The DUAMCO amplifier has two different operation modes, which are selected by DIP switches:

In AMCO mode where no TMA (Tower Mounted Amplifier) is used the DUAMCO gain is around 19 dB.

Together with a TMA the DUAMCO works in MUCO mode. In MUCO mode the gain is reduced to about 0 dB. The exact gain of the DUAMCO to compensate the cable losses are adjusted with DIP switches. The service personnel only do this adjustment once during the installation of the BTSE.

If both branches of TMA fail, a "fail save compensation" takes effect: the DUAMCO switches automatically from MUCO mode to AMCO mode and operation continues with performance degradation.

DUAMCO are available for the frequency bands P-GSM900, GSM-RE900, GSM1800 and GSM1900.

Insertion losses for the different DUAMCO types are given in the following table:

Combiner type Insertion loss (downlink, dB)

DUAMCO 8:2 8.4

DUAMCO 4:2 5.7

DUAMCO 2:2 2.5

Notes

DUAMCO 8:2 occupies two ACOM slots. It can be installed in ACOM slot no. 0 or in slot no. 2.

DUAMCO 2:2 does not contain a hybrid coupler.


MN1780EU09MN_0001

© 2001 Siemens AG

28

2.2.4.2 Filter Combiner FICOM

With FICOM up to 8 TX (in one rack) may be combined. FICOM contains tunable narrow-band filters (TNF) making it unsuitable for synthesizer frequency hopping. The advantage of filter combining is the very low insertion loss.

Two different types of modules are available:

��Base module 2:1

��Expansion module 2:1

Each of the two modules combines 2 carriers. But only the base module has an antenna connector (7/16 connector) and reports the VSWR. A special RF connection cable connects base and extension modules. Additionally, there is a test output at every base module.

The number of base modules is equal to the number of cells. The number of expansion modules per cell, however, depends on the total number of carriers per cell (max 8).

The FICOM offers the following functions:

��Radio Frequency: RF power combining, transmitter spurious signal suppression, isolation between inputs and between input and output

��Control / Monitoring: VSWR alarm thresholds setting and status report, internal performance monitoring, interface to BTSE

��LED: VSWR alarms, tuning alarms, presence of DC

��lightning protection at RF output connector (7/16)

The insertion losses for FICOM are given in the following table:

Number of combined carriers /frequency offset

Maximum insert loss (dB)

2/600 2.7

4/600 3.2

6/600 3.7

8/600 4.2

For Operation & Maintenance, the FICOM components ("managed objects") antenna supervision VSWR and tunable narrowband filter TNF are fixedly assigned to the plug-in position ("ACOM slot"):

ACOM Slot No FICOM-VSWR No. FICOM TNF No.

0 0 0, 1

1 1 2, 3

2 2 4, 5

3 3 6, 7



29

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

from

Tx

Control

CAN bus

DC interf.

from

Tx

from

Tx

Control

CAN bus

DC interf.

from

Tx

from

Tx

Control

CAN bus

DC interf.

from

Tx

from

Tx

Control

CAN bus

DC interf.

from

Tx

Base 2:1 Exp 2:1 Exp 2:1 Exp 2:1

Antenna

VSWR

supervision

TNF TNF TNF TNF TNF TNF TNFTNFESN ESN ESN ESN

Filter Combiner FICOM

Fig. 17 FICOM in 8:1 configuration


MN1780EU09MN_0001

© 2001 Siemens AG

30

2.2.4.3 Di-Amplifier Multicoupler DIAMCO

The DIAMCO provides multi-coupling. It consists of two independent sub-modules with receive filters, low noise amplifiers and power splitters.

The LNA provides for a low system noise and consists of two branches. In case of malfunction of one amplifier the RX gain of the DIAMCO decreases by about 6 dB. The power splitter distributes the received band to max 8 carrier units. Additionally, the DIAMCO has a cascading output, which is used for rack extension.

The DIAMCO contains a PDU (Power Distribution Unit) for two TMA. The PDU provides DC power supply and alarm supervision of the TMA. Alarm monitoring is done with a signaling interface between DIAMCO and TMA, modulated onto an IF carrier at 7.86 MHz: This interface is identical to the interface between DUAMCO and TMA.

For Operation & Maintenance, the DIAMCO components ("managed objects")

��TMA remote power supply DIDCTMA and

��low-noise amplifier DILNA

are fixedly assigned to the DIAMCO slot:

DIAMCO Slot No DIDCTMA No DILNA No

0 0, 1 0, 1

1 2, 3 2, 3

The DIAMCO RX amplifier has two different operation modes, depending on the existence of TMA. The modes are selected with a DIP switch.

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

Together with a TMA the DIAMCO is configured in MUCO mode. In MUCO mode the gain is reduced to about 0 dB. The exact gain of the DIAMCO to compensate the cable losses is adjusted for the MUCO mode with DIP switches. The service personnel only do this adjustment once during the installation of the BTSE.

As the TMA status information is available for the DIAMCO processor, the DIAMCO itself switches the RX mode according to the TMA status (c.f. DUAMCO operation with TMA):

DIAMCO transmits error messages to the BTSE core only via the CAN bus.

Note: For rack extension the first DIAMCO works in the AMCO mode and the following DIAMCO sub modules in the MUCO mode. Cascading can be done max. twice.

DIAMCO noise figure (dB) Gain (dB)

< 3 19.5�1.5



31

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RXCA

to Rxto/from

core

Antenna #0

Rx

LNA

to Rx

Control

CAN bus

DC interf.

LNA

Antenna #1

Rx

ESN

RXCA

TMA

DC/DC

TMA

Signall.

Triplexer Triplexer

DIAMCO

Fig. 18 DIAMCO internal structure


MN1780EU09MN_0001

© 2001 Siemens AG

32

2.2.4.4 Tower Mounted Amplifier TMA

The TMA contains two duplex filters for combining transmit and receive path to a single antenna and, in addition, an amplifier for the receive signal. The DUAMCO / DIAMCO in this case is used in the MUCO mode, i.e. the DUAMCO / DIAMCO mainly works as multi coupler to split the receive signal for the following CU.

The receive path consists of the RX part of the duplex filter and a LNA (Low Noise Amplifier) including a fail save switch. The LNA provides for a low system noise and consists of two branches (for redundancy). In case of malfunction of one amplifier the RX gain of the TMA decreases by about 6 dB. If both amplifiers fail, they are bypassed by a fail save switch.

The transmit path consists of the two TX parts of the duplexer.

The power distribution unit located in DUAMCO/DIAMCO provides the DC power for the TMA.

Type Noise figure (dB) Gain (dB)

TMA <2.5 28��1

Bypass < -2

RX gain (dB) max. TX power (W)

P - GSM900 28 45

RE - GSM900 28 45

GSM1800 28 35

GSM1900 28 35

Note: TMA, though functionally a part of BTSE, is usually located some distance away from the BTSE rack, close to the antenna.



33

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

To antenna

RX TX

RX TXTMA

Triplexer

Auto-

matic

fail save

switch

TMA Signaling

To DUAMCO /

DIAMCO

Fig. 19 Tower mounted amplifier - structure


MN1780EU09MN_0001

© 2001 Siemens AG

34

2.2.4.5 High Power Duplexer HPDU

The High Power Duplexer is a RF module supporting max. 8 carriers which can be used in two configurations:

��Only two antennas per cell (instead of three, with diversity reception) when using FICOM as antenna combiner

��Only one antenna per cell (instead of two, without diversity reception) when using FICOM

The main functions of HPDU for the TRX path are:

��Filtering of the overall TX signal coming from the rack

��Feeding the overall TX signal to the TX/RX antenna

and for the RX path:

��Filtering of the overall RX signal coming from the TX/RX antenna

As shown in the block diagram below, the HPDU consists of a TX Filter, an RX Filter,

a matching network (always terminated with 50 � load) and a Low Pass Filter (LPF) for the RX path.

Three different HPDU versions are provided for P/PS-GSM900 and GSM1800 bands.

Variant max. input power (W)

P - GSM900 8 x 30

GSM1800 8 x 18 W

Max. two HPDU units can be installed per rack (below cover on top for indoor rack, into sidewalls for outdoor shelter).

RXFILTER TXFILTER

RXMATCH

50 Ohm

ANTENNA

LPF

RXOUTTXIN

Fig. 20 Functional Structure of HPDU



35

f1 f2

FICOM 1

FICOM 2

TX/RX ANTENNA 1TX/RX ANTENNA 2

F

EEDE

R

F

EEDE

R

RX MAIN RX DIVf8

HPDU

HPDU 2

HPDU 1

TX/RX ANTENNA 1

DIAMCO 1

f10 f16f9

RX MAIN RX DIV

DIAMCO 2

ExpExp

Fig. 21 16 TRX per cell using two antennas (with diversity)


MN1780EU09MN_0001

© 2001 Siemens AG

36

2.2.4.6 BIAS-T (DUBIAS)

If the TMA is used together with a HPDU, a DUBIAS for

��TMA powering and

��TMA signaling

is required.



37

FICOM

HPDU

DUBIAS

TMA

TX/RX antenna

DIAMCO

TMA

CU1CU2 CU8 RX1RX2 RX8

Fig. 22 DUBIAS together with HPDU and TMA


MN1780EU09MN_0001

© 2001 Siemens AG

38

2.3 Rack Layout, Rack Extension and Service Racks

Rack extension enables the operator to build large sites with up to 24 transceivers (BS24x and BS240XL) by extending the master rack with up to two slave racks (one slave rack for BS240XL). The extension racks are controlled by the core in the base rack.

In addition to base and extension racks, up to five service racks for BS240/241 and BS240XL (and four service racks for BS40/41) can be installed. They provide battery backup, AC/DC converters and microwave and/or link termination equipment. A service rack is not dedicated to a master / slave rack. The service racks can be equipped freely. All services racks which are equipped with AC/DC modules are called service rack 1 (i.e. “type 1"), the others are called service rack 2 (“type 2”). The service racks can house up to 3 battery systems in as many shelves, composed of four units each.

Equipment BS240/241 Base and Extension Rack / Shelter

Module Minimum Number Maximum Number

DC Panel 1 1

Core Modules (base only) 1 4

CU 1 8

DIAMCO 0 2

DUAMCO/FICOM 0 4

Subracks 3 3

Heat Exchanger (BS241 only) 1 1

Membrane Filter (BS241 only) 1 1

Equipment BS240/241 Service Rack / Shelter


DC Panel 1 1

Subracks 0 3

Battery 0 3 (MEM) / 2 (HEX)

AC / DC Modules 0 12

Microwave 0 18

Heat Exchanger (BS241 only) 1 1

Membrane Filter (BS241 only) 1 1



39

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

CO

BA

0

CO

SA

0

CO

BA

1

CO

SA

1

Rack 0

Base Rack

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNETONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

CO

BA

0

CO

SA

0

CO

BA

1

CO

SA

1

Rack 1

Extension Rack

Rack 0

Base Rack

AC + DC Distribution

AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNE T

Rack 3

Service1 Rack

++

++

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

CO

BA

0

CO

SA

0

CO

BA

1

CO

SA

1

Rack 0

Base Rack

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNE T

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNETONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

CO

BA

0

CO

SA

0

CO

BA

1

CO

SA

1

Rack 1

Extension Rack

Rack 2

Extension Rack

Rack 0

Base Rack

Rack 4

Service2 Rack

Rack 3

Service1 Rack


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

Rack 3

Service1 Rack

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNET

Rack 1

Extension Rack

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

ACOM

# 0

CU

# 0

CU

# 1

CU

# 5

CU

# 2

CU

# 3

CU

# 6

CU

# 7

ACOM

# 1

ACOM

# 2

ACOM

# 3

CU

# 4

MU

CO

# 0

MU

CO

# 1

CO

BA

0

CO

SA

0

CO

BA

1

CO

SA

1

Rack 0

Base Rack

Product portfolio.dfsRainer, CA MR EF108.05.00

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNET

++

++

++

++

Rack 4

Service2 Rack


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

AC/

DC

# 10

AC/

DC

# 11

AC/

DC

# 12

AC/

DC

# 13

AC/

DC

# 14

AC/

DC

# 15

AC/

DC

CTRL

1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNET

++

++

AC/

DC

# 00

AC/

DC

# 10

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNE T

++

++

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

++

++

1/4Battery

set

1/4Battery

set

1/4

Batteryset

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

1/4Battery

set

Fig. 23 Configuration Examples for BS240


MN1780EU09MN_0001

© 2001 Siemens AG

40

Equipment BS240XL Base and Extension Rack


DC Panel 1 1

Core Modules (base only) 1 4

CU 1 12

DIAMCO 0 4

DUAMCO/FICOM 0 4

Subracks 4 4

Equipment BS240XL Service Rack


DC Panel 1 1

Subracks 0 4

Battery 0 3

AC / DC Modules 0 12

Microwave 0 4

Equipment BS40/41 Base Rack / Shelter


DC Panel 1 1

Core Modules 1 4

CU 1 4

DIAMCO 0 1

DUAMCO 0 2

AC / DC Module 0 3

Battery 0 1

Subracks 3 3



41


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

AC/

DC

# 10

AC/

DC

# 11

AC/

DC

# 12

AC/

DC

# 13

AC/

DC

# 14

AC/

DC

# 15

AC/

DC

CTRL

1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THERNET

++

++

Battery Battery

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

++

++

Battery Battery


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

AC/

DC

# 06

AC/

DC

# 07

AC/

DC

# 08

AC/

DC

# 09

AC/

DC

# 10

AC/

DC

# 11

AC/

DC

CTRL

1

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNE T


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

ONONONON ONONONONON

ACT-C

DC-PANELLMT

E THE RNE T

++

++

Battery Battery

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

++

++

Battery Battery

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

++

++

Battery Battery

++

++

Battery Battery

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHE RNE T

++

++

Battery Battery

++

++

Battery Battery


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

++

++

Battery Battery

++

++

Battery Battery

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET


AC/

DC

# 00

AC/

DC

# 01

AC/

DC

# 02

AC/

DC

# 03

AC/

DC

# 04

AC/

DC

# 05

AC/

DC

CTRL

0

ONONONON ONONONONON

ACT-C

DC-PANELLMT

ETHERNET

Service Rack 2 Service Rack 2 Service Rack 2 Service Rack 2

Service Rack 1 Service Rack 1 Service Rack 1 Service Rack 1 Service Rack 1

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 6

LE 7

LE 8

LE 9

LE 10

LE 11

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 6

LE 7

LE 8

LE 9

LE 10

LE 11

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 6

LE 7

LE 8

LE 9

LE 10

LE 11

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

LE 0

LE 1

LE 2

LE 3

LE 4

LE 5

Fig. 24 Different types of service racks


MN1780EU09MN_0001

© 2001 Siemens AG

42

2.4 Rack Extension and Numbering

For BS240/241, the base rack can be extended with up to two extension racks, all controlled from the COBA. BS240XL supports a single extension rack. Rack extension is not foreseen for BS40/41. Rack 0 is created automatically by SW, the other racks (e.g. extension "1" and "2") are created by the operator.

The following configuration rules must be observed:

1. A rack houses up to 6 cells.

2. The maximum number of TRX per cell is 24.

3. The maximum number of cells per site is 12.

Due to its limited capacity the corresponding values for BS40/41 are max. 4 TRX in max. 3 (with diversity) or 4 cells (without diversity).

A multi-rack configuration (BS240/241 and BS240XL) contains the following units:

��carrier units CU on the master rack and the extension racks

��combining equipment on the master rack and the extension racks

��core boards, i.e. the COBA board and the COSA board, on the master rack only

The CU in the extension racks are controlled by the COSA on the master rack.

Irrespective of rack extension, service racks may be used together with the base and extension racks.

For BS24x/BS240XL and BS40/41 the max. number of service racks are 5 and 4, respectively.

Fully equipped BS24x/BS240XL and BS4x comprise 8/7 and 5 racks, respectively.

The following table summarizes the racks and their numbering for BS24x/BS4x:

Rack No. Rack Type BS40/41 BS240/241 BS240XL

0 Base yes yes yes

1 extension #0 no yes yes

2 extension #1 no yes no

3 service type 1 no yes yes

4 service type 2 yes yes yes






43

Service racks are represented from rack number 3 (BS24x and BS240XL, AC/DC modules mandatory) and rack number 4 on (BS40/41, only service rack 2 allowed). A service rack may contain:

��AC/DC converter (service rack 1 only)

��battery back-up

��microwave/link equipment

If, exceptionally, the base and the extension racks cannot be located side by side, the following points must be observed:

��TX combining is always done inside the borders of a single rack/shelter

��expansion of RX paths beyond the borders of a rack or a shelter is possible by cascading the multicoupling devices (DIAMCO or RX path of DUAMCO)

Given this restriction, the maximum allowed separation between base and extension racks / shelters is 3 m. The separation of service racks / shelters is not so critical but the cables to the base and extension racks have to be protected against lightning.

If a rack / shelter is separated from another all interrack cabling must be located in a closed metal earthed duct to protect against EMI, lightning and vandalism.


MN1780EU09MN_0001

© 2001 Siemens AG

44

2.5 Power Supply

The mains input voltage for BS24x and BS240XL are

��-48 V DC (not for BS241)

��400 V, 50 Hz, 3-phase (3 x 230 V ac, single phase)

��207 V, 60 Hz, 2-phase (2 x 120 V ac, single phase, US market)

For BS40/41 only

��230 V, 50 Hz, single phase

��207 V, 60 Hz and 240 V, 60 Hz, two phase (2 x 120 V ac)

are available.

A backup battery module is installed in BS40/41 base rack. Backup batteries for BS24x and BS240XL and additional backup batteries for BS40/41 can be installed in service racks / shelters.

Maximum 3 AC/DC modules are installed in BS40/41. For BS240/241, two frames with 6 AC/DC modules (and a DC battery controller) each can be housed in service rack 1. Max two battery systems (same capacity, located in the same rack) may be connected to the same AC/DC frame. The service racks can house up to 3 battery systems in as many shelves, composed of four units each.

The number of AC/DC modules needed depends on the configuration of the BTSE (CU, core, ACOM etc) including the service racks (link equipment). The AC/DC modules are designed for a primary voltage of 230 V AC and a DC output power of 800 W (temperature limit +50 °C; for 720 W limit is +55 °C). N+1 AC/DC modules work in load sharing: in case one of the AC/DC modules fails, the remaining n AC/DC can supply the whole BTSE.

The max. DC output power of one AC/DC subrack is limited to 4000 W. The backup batteries are available with capacities 80 Ah, 85 Ah and 100 Ah for BS24x and 12 Ah (integrated in base) for BS4x.



45

Type of Module Typical Power Consumption (per Module, W)

Core 17

CU 135 ("power step 0")

Note: EDGE-CU has max 200 W

DUAMCO 25

DIAMCO 12

Subrack (fans) 60

DC-Panel 10

Heat Exchanger 30

Microwave Equipment 90

Battery 20


MN1780EU09MN_0001

© 2001 Siemens AG

46

2.6 Compatibility

With new BTSplus existing networks may easily be expanded:

��BTSplus and BS-20/21/60/61 are compatible on Abis level; i.e. they can be connected to the same BSC, but cannot be interconnected (e.g. with the rack extension feature).

��A mixture at the same site is allowed if BS-60/61 and BS-240/241 have their own Abis line (e.g. multidrop configuration) and are configured as two logical BTSE.

��Software features run on all mainline BTS types (BS-2x, BS-6x, and BS24x).

��OMC presentation of the mainline BTS types is different.

Mixed service of all BTSE types is possible (star, multidrop, loop or cross-connect configuration).

2.7 Comparison between BS2x/6x and BS24x Modules

The following table contains a rough comparison between BTSplus and BTSone modules.

BS24x modules BS2x/6x modules

CU HPA, TPU2, BBSIG44, DCPA, DCTPU

COBA & COSA CCTRL, MCLK, ALCO, LIPA

DUAMCO DUCOM, 2 x RXAMCO, GPSU

DIAMCO 2 x RXMUCO (or 2 x RXFIL, 2 x RXAMCO), GPSU

FICOM FICOM

TMA RXAMOD

Note: HYCOM is only available for BS6x and BS20.

2.8 EDGE Carrier Unit

Both the BTSone and the BTSplus family support GPRS (General Packet Radio Service) since release BR5.5. For the Base Transceiver Stations, no hardware upgrade is required, i.e. GPRS can be introduced simply by a software download (new PPCU/PPXX modules are required for BSC, however).

For the new GSM phase 2+ feature EDGE (Enhanced Data Rates for GSM Evolution), new CU are introduced for BTSplus. The EDGE CU hardware is available with BR6.0. Software supporting EDGE is planned for BR7.0.



47

BSC

BS-240XL

BS-240

BS-61BS-41BS-20BS-40

BS-60

BS-241to MSC

TRAU

Fig. 25 Mixed configurations of BTSone (BS2x, BS6x) and BTSplus (BS24x, BS4x)


MN1780EU09MN_0001

© 2001 Siemens AG

48

3 Configuration Examples

Multicoupling beyond the rack borders (but not combining!) is allowed and can be achieved by cascading of multicoupling equipment.

Cascading is realized by wiring the cascading output of a DUAMCO or DIAMCO to the antenna input of a DUAMCO or a DIAMCO. Cascading should not be done more than twice in series.

Diversity reception mixing DUAMCO and DIAMCO is allowed.

3.1 Two Cells

CU0 CU1 CU2 CU3

RX TXRX TX RX TX RX TX

Cell 0

DUAMCO 2:2 DUAMCO 2:2

CU0 CU1 CU2

Cell 0

CU3

DUAMCO 4:2

RX TXRX TX

Fig. 26 Two cells



49

3.2 Three Cells

RX TX

RX TX

AFS

CU0 CU1 CU2 CU3 CU4 CU5 CU6 CU7

Cell 0 Cell 1 Cell 2

DUAMCO#2 DUAMCO#3 DIAMCO#1DIAMCO#0FICOM#0, #1 DIAMCO#1 DIAMCO#0 FICOM#0, #1 FICOM#2, #3

CU8 CU9 CU10 CU12 CU13 CU14 CU15CU11

RackBorder

RX TX

Rack 0 Rack 1

RX RX RX RX RXTXTXTX

RX TX

RX TX

AFS

RX TX

RX TX

AFS

RX TX

RX TX

AFS

RX TX

RX TX

AFS

RX TX

RX TX

AFS

RX TXRX

RX TX RX TXRX RX

TMA0 TMA1 TMA2 TMA3 TMA4 TMA5

Fig. 27 Three cells

3.3 Six Cells

CU0 CU1 CU2 CU3 CU4 CU5

RX RX

CU6 CU7

RX RX

Cell 0 Cell 1 Cell 2 Cell 3 Cell 4 Cell 5

DUAMCO #0 DUAMCO #1 DUAMCO #2 DUAMCO #3DIAMCO #0 DIAMCO #1

RX TX RX TX RX TX RX TX RX TX RX TX RX TXRX TX

Fig. 28 Six cells



51

4 BS240XL Details


MN1780EU09MN_0001

© 2001 Siemens AG

52

4.1 Overview

BS240XL features a new rack type used for all cabinets (base, extension, and service). This rack has the same footprint (600 x 450) as the BS240 rack but increased height (2025 vs. 1600 mm). Thus, an additional subrack (in total 4 instead of 3 subracks) can be mounted increasing the capacity (per rack) by 4 CU and 2 DIAMCO.

The following table summarizes the changes:

Module Type BS240XL

Max No. (per Rack)

BS240

Max No. (per Rack)

Carrier Unit CU 12 8

Fan 8 6

Di-Amplifier Multicoupler DIAMCO 4 2

Tower Mounted Amplifier TMA 16 12

Extension Racks 1 2

Mixing of BS240 and BS240XL racks is possible in principle, will be implemented, however, on project-specific request only. In general, back-to-back installation is preferred, as for the side-by-side installation a special EMI-shielded "tube" carrying the inter-rack cabling is required.



53

4.2 Affected Modules

The following modules are affected by the introduction of BS240XL:

Rack

There is only one type of hardware used indoors for the base, extension and service racks. Their flexible configuration is achieved by different cabling kits and EMI panels. Cabling access is from the top: ACOM are located in the highest subrack, the core modules are placed in the lowest shelf. Fully equipped, a BS240XL is made up of 7 racks (base, extension, service rack 1 and 4 service rack 2).

Subrack for Carriers

A new frame is used for both base and extension racks. The modification concerns the new DIAMCO backplane necessary for the extended DIAMCO address range (0 to 3 vs. 0 to 1).

Power Supply

A new subrack (for AC/DC modules) is used in BS240XL service rack 1 due to a change in DC cabling. The extension frame for additional 6 AC/DC modules is the same as for the ("small") service rack.

The Mains Supply Unit MSU containing lightning protection, EMI filter and connection terminal is modified to support a higher DC current (new EMI filter with capacity 80 A). This MSU is required for external DC power only (not in service rack 1).

For base and extension racks only, different types of EMI panels are introduced (service racks use the same panel as in BS240). The EMI panel is for feeding through the rack-top cabling. It contains spaces for OVPT, MSU and ACTM.

The DC panels are modified to provide additional CU breakers (in base and extension racks) and breakers to support 80 A mains capacity (in service rack 1).

TRX Related Equipment

As the amount of DIAMCO per rack is increased (from 2) to 4, the address range changes accordingly and must be supported by the DIAMCO firmware. Thus, the "version 3" DIAMCO cannot be used in BS240XL. The newer versions (4 and later) can be used both in BS240 and BS240XL. A coding keyway system makes sure that only correct versions of DIAMCO can be installed.

FICOM can be used in BS240XL. However, fully equipped (4 ACOM positions), max. 8 TRX are combined. As combining beyond rack borders is not allowed, the (CU) capacity of BS240XL cannot be fully used in this case. In consequence, the installation of FICOM, HPDU and DUBIAS is of limited use in BS240XL.

No modification of carrier units CU is required, only their max. number per rack is increased from 8 to 12.


MN1780EU09MN_0001

© 2001 Siemens AG

54

4.3 BS240XL Configuration Examples

As an example, several cell configurations using DUAMCO8:2 and DUAMCO4:2, respectively, are given in the following tables (for the TRX indicated by *, additional DIAMCO modules must be installed for diversity).

DUAMCO8:2 (12 TRX)

TRX assigned to ACOM Slot

Configuration TRX / cell 0 1 2 3

1 Cell (12) 12 1...6 7...12

2 Cells (6/6) 6

6

1...6

7...12

4 Cells (3/3/3/3) 3

3

3

3

1...3*

4...6*

7...9*

10...12*

DUAMCO8:2 (24 TRX)


Configuration TRX per cell 0 (Base) 2 (Base) 0 (Exten.) 2 (Exten.)

2 Cells (12/12) 12

12

1...8 7...12

1...4

5...12

3 Cells (8/8/8) 8

8

8

1...8

7...12

1...4

5...12

6 Cells (4/4/4/4/4/4) 4

4

4

4

4

4

1...4*

5...8*

9...12

1...4*

5...8*

9...12



55

DUAMCO4:2 (12 TRX)


Configuration TRX / cell 1 2 3 4

1 Cell (12) 12 1...4 5...8 9...12

2 Cells (6/6) 6

6

1...4 5...6*

7...8*

9...12

2 Cells (4/8) 4

8

1...4

5...8

9...12

3 Cells (4/4/4) 4

4

4

1...4

5...8

9...12

3 Cells (6/4/2) 6

4

2

1...4 5...6*

7...8*

9...12

4 Cells (3/3/3/3) 3

3

3

3

1...3

4...6

7...8

9...12

6 Cells (2/2/2/2/2/2) 2

2

2

2

2

2

1...2*

3...4*

5...6*

7 8*

9...10*

11...12*


MN1780EU09MN_0001

© 2001 Siemens AG

56

BS-240XL Base Rack

BS-240XL

Extension Rack

4

44

RX TX RX TX

DUAMCO 8:2

RX RX TX

DIV

4 x CU

RX RX TX

DIV

4 x CU

44 4

RX RX TX

DIV

4 x CU

4 4

RX TX RX TX

DUAMCO 8:2

RX RX

DIAMCO

44

Cell 0 / 4 Carriers

Cell 1 / 4 Carriers

Cell 2 /

4 Carriers

3 Cells with

4 Carriers each

same

HW configurationas in

base rack:

2x DUAMCO8:2

1x DIAMCO

12x CU

Fig. 29 Example Configuration (4/4/4/4/4/4) in two Racks with 4 DUAMCO8:2 and 2 DIAMCO

Cell 0 / 8 Carriers Cell 2 / 8 CarriersCell 1 / 8 Carriers

DUAMCO 8:2

RX TX

4

4

4 x CU

RX RX

DIV

TX

4

DUAMCO 8:2

RX TX RX TX

4 484

4 x CU

RX RX

DIV

TX

4

RX TX

48

DUAMCO 8:2

RX TXRX TX

4 488

8 x Carrier Units

RXDIV TX RX TX

BS-240XL Base Rack BS-240XL Extension Rack

DUAMCO 8:2

RX TXRX TX

4 4 8 8

8 x Carrier Units

RXDIV TX RX TX

Fig. 30 Example Configuration (/8/8) in two Racks with 4 DUAMCO8:2



57

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Cell 0 / 12 Carriers Cell 1 / 12 Carriers

DUAMCO 8:2

RX TX

4

4

4 x CU

RX RX

DIV

TX

4

DUAMCO 8:2

RX TX RX TX

4 4 8 4

4 x CU

RX RX

DIV

TX

RX TX

48

DUAMCO 8:2

RX TXRX TX

4 484

8 x Carrier Units

RXDIV TX RX TX

BS-240XL Base Rack BS-240XL Extension Rack

DUAMCO 8:2

RX TXRX TX

4 44 8

8 x Carrier Units

RX TX RX

DIV

TX

44 44 4

Fig. 31 Example Configuration (12/12) in two Racks with 4 DUAMCO8:2



59

5 Technical Data

BS240/241

BS240 (BS240XL) BS241 (outdoor)

Carriers per Rack 8 (12) 8

Height x width x depth (mm) 1600 x 600 x 450

(2025 x 600 x 450)

1750 (incl. splinth) x 700 x 650

Volume net (l) 432 (547) 705

Weight (kg) 210 (250) 265

Operation acc. to ETSI 3.1E ETSI 4.1E

Temp. range (incl. solar radiat.) -5° to +55° C -45° to +50° C

Power consumption max. (kW) 1.3 (2.8) 1.85

Output Power GSM900 (W) 50 50



Battery backup Integrated Integrated

Space for microwave equipm. Available Available

BS40/41

BS40 (indoor) BS41 (outdoor)

Carriers per Rack 4 4

Height x width x depth (mm) 1600 x 600 x 450 1750 (incl. splinth) x 700 x 650

Volume net (l) 432 705

Operation acc. to ETSI 3.1E ETSI 4.1E

Temp. range (incl. sol. radiat.) -5° to +55° C -45° to +50° C

Power consumption max. (kW) 0.7 1.07




Battery backup Integrated Integrated

Space for microwave equipm. Available Available



61

6 Exercises



63

��Which base station types belong to the BTSplus family?

��How many carriers does a fully equipped BS240 support? How many racks are required for this configuration? What is the minimum equipment for a BS240?

��How many racks are required if the same configuration is realized with BS240XL? Are there restrictions in using BS240 modules in BS240XL? Is an "XL" available for outdoor use?

��How many cells does a fully equipped BS41 support with/without diversity? Can BS240 modules be re-used in BS41?

��Which types of power supply are available for BS24x/BS4x? Where are the corresponding modules (incl. batteries) located?

��How many service racks are supported by BS240, BS240XL, BS40? Which of these belong to type 1 or type 2? Explain the difference between a service rack of type 1 and type 2?

��Which types of redundancy is supported by BTSplus?

��Which modules form the BTSE "core"? What are their main functions?

��How many core modules in BTSplus are required for 6, 12, 18, 24 TRX (with and without core redundancy)? Which is the capacity (in 64 kbit/s time slots) required to support these carriers on the terrestrial side (PCMB)?

��How many physical ports are available on COBA / COSA? How many (terminating) PCMB lines are supported by COBA / COSA?

��BS4x supports max 4 TRX, yet it can be equipped with COSA. Why?

��What is the name of the link between core modules and CU? How is the core connected to the combining equipment?

��Which type of combining equipment is available for BTSplus? Compare the two main options and their advantages.

��Which types of DUAMCO and FICOM are available? How many CU and antennae may be connected? Does one combiner module support more than one cell?

��What is a TMA and where is it located? Which types of combiners support TMA operation? Which module is responsible for TMA supervision and TMA powering?

��What is the difference between MUCO and AMCO mode? For which modules is it relevant to set MUCO and AMCO mode and how is it done?

��How many external alarms (in total) are available for BTSplus?

��Which modules are required in BTSplus to offer EDGE?

��Compare the BTSone and the BTSplus hardware: How many modules form the core? How many modules are required to provide one carrier? What are the differences in the combining equipment available?

03 Mn1780eu09mn 0001 Btsplus Architecture

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