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Internal
OME201102 HUAWEI BTS3012
Hardware Structure
ISSUE 1.0
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Upon completion of this course, you will be able to:
Know the functions and features of BTS
Master the BTS hardware structure
Master the cable connection of BTS
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References
BTS3012 Technical Manual
BTS3012 Installation Manual
BTS3012 User Manual
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Chapter 1 OverviewChapter 1 Overview
Chapter 2 System ComponentsChapter 2 System Components
Chapter 3 Signal ProcessingChapter 3 Signal Processing
Chapter 4 Antenna and Feeder SystemChapter 4 Antenna and Feeder System
Chapter 5 Typical configurationChapter 5 Typical configuration
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Location
OMC: Operation and Maintenance CenterVM: Voice Mailbox
SMC: Short Message CenterVLR: Visitor Location RegisterMSC: Mobile Switching Center
EIR: Equipment Identity RegisterAUC: Authentication CenterHLR: Home Location Register
BSC: Base Station ControllerBTS: Base Transceiver StationMS: Mobile Station
PSTN
ISDNPSPDN
Um Interface
BTS3012
BTS3012
BTS3012
BTS3012
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAPM A P
TUP,ISUPMS
MS
MS
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Features and Functions
Support GSM800M、850M、900M、1800M、1900M
Support networking topology includes star, tree, chain and ring
Support A5/1 and A5/2 encryption/decryption
Support GPRS and EDGE
Support dynamic and static power control
Support the omni-directional coverage and directional
coverage
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Features and Functions
Double Transceiver Unit (DTRU). A single cabinet can support
up to 12 carriers. It can smoothly evolve into WCDMA Transmit diversity, 4-receive diversity
Support Power Boost Technology (PBT)
BTS3012 can share cabinet with WCDMA base station. The
module of WCDMA base station can be inserted in the
BTS3012 cabinet
Support more various transmission mode includes E1, STM-1,
microwave, and satellite transmission
The DTRU of the BTS3012 can be inserted into
BTS30/BTS312 with -48V DC power supply
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Chapter 1 OverviewChapter 1 Overview
Chapter 2 System ComponentsChapter 2 System Components
Chapter 3 Signal ProcessingChapter 3 Signal Processing
Chapter 4 Antenna and Feeder SystemChapter 4 Antenna and Feeder System
Chapter 5 Typical configurationChapter 5 Typical configuration
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Hardware structure
TMA TMA
DTRU DAFU
Antenna and feeder
subsystem
Forepart of RF
Subsystem
TMA TMA
DTRU DAFU
TMA TMA
DTRU DAFU
Double transceiversubsystem
DATU
Um Interface
DATU
fiber
E1
Abis Interface
M
E
L
C
Common subsystem
NFCB
Metro 100
DTMU
DEMU
E1
BITSMonitor
TBUS/DBUS/CBUS
MS
FH _BUS
Extension
cabinet
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
DDPU
D
COM
D
COM
DDPU
D
COM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
MLC
Power andEMC
Transmission Unit
D
DPU
ELC
ELC
SAC
Transmission Unit
DTM
U
DTM
U
DEM
U
DC
CU
DC
SU
DA
TU
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BTS3012 Cabinet and Boards
NodeB Fan Controlling and monitoring BoardFAN Box
Cabinet Top Backplane for DTRU BTSDCTB
Environment Monitoring Unit for DTRU BTSDEMUCombined cabinet Signal connection Unit for DTRU BTSDCSU
Signal Access Card for DTRU BTSDSAC
E1 Signal Lightning-Protection Card for DTRU BTSDELC
Monitor Signal Lightning-Protection Card for DTRU BTSDMLC
Antenna and TMA Control Unit for DTRU BTSDATU
Combining Unit for DTRU BTSDCOM
Dual Duplexer Unit for DTRU BTSDDPU
Antenna Front-end Unit for DTRU BTSDAFU
Cable Connection Unit for DTRU BTSDCCUTransmission & Timing & Management Unit for DTRU BTSDTMU
Double Transceiver UnitDTRU
DescriptionAbbreviations
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Common Subsystem
DTMU Transmission timing& management unit for DTRU BTS
DEMU Environment Monitoring Unit for DTRU BTS
DCSU Combined cabinet Signal connection Unit for DTRU
BTS
DCCU Cable Connection Unit for DTRU BTS
DATU Antenna and TMA control unit for DTRU BTS
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Functions of DTMU
Providing the external GPS input, the BITS synchronized clock
input Providing 4-route or 8-route E1 input,backup between the
active and standby boards
Providing local MMI maintenance of the 10 M network port
Controlling, maintaining, and operating the BTS
Providing fault management, configuration management,
performance management, and security management
Supporting 8-route digital alarm input. Two routes are lightningarrester failure alarm detection
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Structure of DTMU
MCK
OML
DBUS
CBUS2
Clock
BIU DTRU
DTMU
BSC
MCUMMI
LMT
Abis
External
synchronizedclockSubrack number
and clock
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Indicators on DTMU
E1 port 1 remote end alarm occurs when SWT is outE1 port 5 remote end alarm occurs when SWT is on
Fast flash (4 Hz)
E1 port 1 near end alarm occurs when SWT is outE1 port 5 near end alarm occurs when SWT is on
On
E1 port 1 is normal when SWT is outE1 port 5 is normal when SWT is on
OffIndicates thetransmission
status of E1port 1 and
port 5
GreenLIU1
LockFast flash (1 Hz)
Pull-inFast flash (4 Hz)
Free-runOn
AbnormalOffIndicates theclock status
GreenPLL
ActiveOn
StandbyOffIndicateswhether theboard isactive or
standby
GreenACT
Power failure of the boardOff
BSC data loadingFast flash at uncertainintervals
NormalSlow flash (0.5 Hz)
OML is blockedSlow flash (0.25 Hz)Indicatesoperation
GreenRUN
MeaningStatusDescriptionColorIndicator
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
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Hardware alarmOn
No hardware alarmOffAlarm indicatorsRedALM
LIU1 to LIU4 indicate the transmission status of E1 port5 to 8.
On
LIU1 to LIU4 indicate the transmission status of E1 port1 to 4.
OffIndicates handoverstatus of E1
GreenSWT
E1 port 4 remote end alarm occurs when SWT is out
E1 port 8 remote end alarm occurs when SWT is on
Fast flash (4
Hz)
E1 port 4 near end alarm occurs when SWT is outE1 port 8 near end alarm occurs when SWT is on
On
E1 port 4 is normal when SWT is outE1 port 8 is normal when SWT is on
OffIndicates thetransmission status of
E1 port 4 and port 8
GreenLIU4
E1 port 3 remote end alarm occurs when SWT is outE1 port 7 remote end alarm occurs when SWT is on
Fast flash (4Hz)
E1 port 3 near end alarm occurs when SWT is out
E1 port 7 near end alarm occurs when SWT is onOn
E1 port 3 is normal when SWT is outE1 port 7 is normal when SWT is on
OffIndicates thetransmission status ofE1 port 3 and port 7
GreenLIU3
E1 port 2 remote end alarm occurs when SWT is outE1 port 6 remote end alarm occurs when SWT is on
Fast flash (4Hz)
E1 port 2 near end alarm occurs when SWT is out
E1 port 6 near end alarm occurs when SWT is on
On
E1 port 2 is normal when SWT is out
E1 port 6 is normal when SWT is onOffIndicates the
transmission status ofE1 port 2 and port 6
GreenLIU2
MeaningStatusDescriptionColorIndicator
Indicators on DTMU
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
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Interface on the DTMU panel
Near end maintenance network portRJ45MMI
13M primary reference clockSMB (female)T13M
216.7 Hz frame clockSMB (female)FCLK
Outputs reference testing clockSMB (female)T2M
DescriptionTypeInterface
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Functions of DEMU
The DEMU is placed in slots 2 to 4 and slot 7 of the common subrack with
the DATU. The DEMU is an optional module. There is maximum one
DEMU under full configuration.
Monitoring variations in the smoke, water, temperature, humidity, infrared,
and access control ,Handling alarms
Guaranteeing normal operation of the equipment Output of 6-route Boolean value and input of 32-route main node alarms
DMLC DEMU
CBUS3Monitor signal
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Functions of DCSU
The Combined Cabinet Signal
Connection Unit for DTRU BTS(DCSU) is placed in slot 5 of the
common subrack, which is
located in the lower part of the
cabinet. There is only one DCSU
and it is mandatory
The DCSU transfers signals for
the combined cabinet and cabinet
group between the commonsubrack and the cabinet top
subrack
DCMB
DTMU
DCSU
DTRB
DCTB
DCCU
DEMU
DATU
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The interfaces on the DCSU panel
CC_IN
CC_OUT
TO_DTRB
TOP2
DCSU
Connecting to the cabinet top subrack throughcables
DB26 (female)TOP2
Connecting to the DTRB through cablesMD64 (female)To_DTRB
For cable input to the combined cabinetMD64 (female)CC_IN
For cable output from the combined cabinetMD64 (female)CC_OUT
DescriptionTypeSilk- Screen
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GM51DCSU VERBSW6
SW9
SW14
SW13
SW12
SW7
SW10
SW8
SW5
SW4
SW3
SW11
SW2
SW1
Switch of DCSU
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Functions of DCCU
The DCCU is placed in slot 6 of
the common subrack. There isonly one DCCU and it is
mandatory
Converting the input and output
signals of the common subrack.
Inputting the power of the
common subrack
Providing EMI filtering
DCMB
DTMU
DCCU
NFCB
DCTB
DCSU
DEMU
DATU
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The interfaces on the DCCU panel
POWER
DCCU
To_FAN
TO_TOP1
TRAN
For power input of the common unit3V3POWER
Connects to the cabinet top subrack through
cables
MD64
(female)TO_TOP1
Connects to the fan panel through cablesDB26(female)
To_FAN
For E1 signal inputMD64(female)
TRAN
DescriptionTypeSilk-
Screen
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Functions of DATU
The DATU is placed in slots 2 to 4 and slot 7 of the
common subrack with the DEMU. It is optional and
there are maximum two DATUs
Transmitting the remote electrical tilt unit (RET)
control signals
Feeding the TMA Communicating with the DTMU through CBUS3 for
control and alarm report
DATU
RUN
ACT
ALM
ANT0
ANT1
ANT2
ANT3
ANT4
ANT5
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Cabinet Top Access Subsystem
DMLC( Monitor Signal Lightning-Protection Card for DTRU BTS)
DELC(E1 Signal Lightning-Protection Card for DTRU BTS)
DSAC(Signal Access Card for DTRU BTS)
D
M
L
C
D
E
L
C
D
E
L
C
D
S
A
C
D C F
C K B 2
C K
B 1
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Function of DMLC
The DMLC is placed in slots 0 to 2 of the cabinet top
subrack with the DELC. There is only one DMLC and
it is optional DMLC
Thirty-two-route Boolean value input
Six-route Boolean value output
Four-route analog input
Smoke/water/access
control/infrared/humidity/temperature sensor signal
input
SWIN
SWOUT
DMLC
AIN
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Function of DELC
The DELC is placed in slots 0 to 2 of the cabinet
top subrack with the DMLC
The DELC is mandatory and there is one DELC
under minimum configuration
Without the DMLC, there are maximum three
DELCs, supporting up to 12 routes of protected E1signals
DELC
TR
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Function of DSAC
The DSAC is placed in slot 3 of the cabinet top
subrack. There is only one DSAC and it is mandatory
Six-route Boolean value input.
Two-route CBUS3 output
Two-route input of lightning protection arrester failure
alarm
Access protection of BITS clock input
DSAC
C
O M 1
E A C
S
Y N C
C O M 2
S 1 + S 1 - S 2 + S 2 -
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Double transceiver subsystem
DTRU(Double Transceiver Unit)
DTRB
DTRB
DTRU
DTRU
DTRU
DTRU
DTRU
DTRU
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Functions of DTRU
RF subsystem transmit part. Converts the basband signals on the two
TRXs to the RF signals. Supports up-frequency conversion of the signals
and RF frequency hopping.Filters, amplifies, and outputs the combined
signals
RF subsystem receive part.Devides and modulates the RF signals on the
two TRXs.Supports transmit receive and RF frequency hopping Baseband processing part.Processes signals.Supports coding and
decoding, interleaving and de-interleaving, modulation and
demodulation.Supports voice fax services.Supports data services in
Phase II, GPRS services, and EDGE services.Supports transmit diversityand 4-way receive diversity.Amplifies the output power
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Functional structure of DTRU
DTRU Baseband and RF Unit (DBRU)
DTRU Power Amplifier Unit (DPAU)
DTRU Power Supply Unit (DTPS)
DTMU
DTPS
DTRU
- 48V DC
DPAU
DBRUDAFU
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Indicators on DTRU
RL alarmSlow flash (0.5 Hz)
NormalOff
Standing wave alarmOnRF interfaceindicators
RedRF_IND
The board is normal.Off
Critical alarm occurs to the board.On (including
high-frequencyflash)
Indicates alarmRedALM
Only parts of the logic channels are working
normally (including after TRX mutual aid).
Slow flash (0.5Hz)
Communication between DTRU and DTMU isnot set up
Off
The board is running (the DTMU sendsconfiguration parameters to the DTRU
correctly and the cell is starting). All thechannels on the two carriers can worknormally.
OnIndicates the TRX isworking
GreenACT
The DTMU is sending configuraiton
parameters to the DTRU.Fast flash (2.5 Hz)
The board is running.Slow flash (0.5 Hz)
The board is starting.Slow flash (0.25Hz)
There is no power supply and the board is
faulty.Off
There is power supply or the board is faulty.OnIndicates the runningand power-on of the
DTRU
GreenRUN
MeaningStatusDescriptionColorIndicator DTRU
TX1
IN1
TCOM
IN2
TX2
RSTRUN
ACT
ALM
RF_IND
PWR
RXM1
RXD1RXM2
RXD2
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Indicators on DTRU
Power supply3V3PWR
Diversity receive port of carrier 2 or Diversity 4 receive port of
carrier 1
SMA (female)RXD2
Main receive port of carrier 2 or Diversity 3 receive port of carrier 1SMA (female)RXM2
Diversity 1 or 2 receive port of carrier 1SMA (female)RXD1
Main or diversity 1 receive port of carrier 1SMA (female)RXM1
TX2 output signals:
Output to the forepart of the RF when not in combiner
Output to IN2 in combiner
N (male)TX2
Connects to TX2 in combinerSMA (female)IN2
Combines and outputs IN1 and IN2 or implements PBT combined
output
N (male)TCOM
Connects to TX1 in combinerSMA (female)IN1
TX1 output signals:
Output to the forepart of the RF when not in combiner
Output to IN1 in combiner
N (male)TX1
DescriptionTypeInterface DTRU
TX1
IN1
TCOM
IN2
TX2
RSTRUN
ACT
ALM
RF_IND
PWR
RXM1
RXD1
RXM2
RXD2
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DTRU transmit mode
Transmit independence
Transmit diversity PBT
Wideband transmit combination
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DTRU transmit mode-transmit independence
TCOM
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
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DTRU transmit mode-transmit diversity
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Man made multi way
combinercombiner
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DTRU transmit mode-PBT
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Same phase
combinercombiner
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DTRU transmit mode-wideband transmit combination
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1TCOM
IN2
TX2
combinercombiner
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DTRU receive mode
Receive independence
Receive diversity
4-way receive diversity
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DTRU receive mode- Receive independence
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
dividerdivider
combinercombiner
dividerdivider
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DTRU receive mode- Receive diversity
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
dividerdivider
dividerdivider
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DTRU receive mode- 4-way receive diversity
TRX0TRX0
TX
TRX1TRX1
TXdividerdivider
dividerdivider
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
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Intra structure of DTRU
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
dividerdivider
dividerdivider
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Functions of DTRB
The DTRB is placed in the DTRU
subrack. It has six slots, each
holding one DTRU
The DTRB provides connections
between the DCSU and the DTRU.
All the onsite signals are provided to
the DCSU through the DTRB
DTRB
DTRU
DTRU
DTRU
DTRU
DTRU
DTRU
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Front-End of the RF Subsystem
DDPU (Dual Duplexer Unit for DTRU BTS)
DCOM (Combining Unit for DTRU BTS)
NBBI
D
C
O
M
D
D
P
U
D
C
O
M
D
D
P
U
D
C
O
M
D
D
P
U
1 2 3 4 50
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Functions of DDPU
The DDPU is intermixed with the DCOM in the DAFU subrack
of the forepart of RF subsystem. It is indispensable. Generally,
the number of DDPU is one at least and three at most. Without
the DCOM, there can be at most six DDPUs
Sending multi RF signals from the transceiver in the DTRU to
the antenna through the duplexer
Sending signals from the antenna after amplifying and
quartering them to the transceiver in the DTRU
Detecting standing wave alarms in the Antenna Feeder system
Receiving the gain control of the low noise amplifier
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Functional structure of the DDPUANTB
TXA
TXB
RXA4
duplexerduplexer dividerdivider duplexerduplexer dividerdivider
ANTA
RXA1
RXA2RXA3
RXB1
RXB2RXB3RXB4
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Indicators on DDPU
No standing wave alarm occur to Channel BOff
Standing wave critical alarm occurs toChannel B
On
Standing wave alarm occurs to Channel BSlow flash (0.5 Hz)Indicates a standingwave alarm of ChannelB
RedVSWRB
No standing wave alarm occurs to Channel AOff
Standing wave critical alarm occurs to
Channel AOn
Standing wave alarm occurs to Channel ASlow flash (0.5 Hz)Indicates a standingwave alarm of Channel
A
RedVSWRA
The board is starting or loading the newest
application programsSlow flash (0.5 Hz)
No faultOff
There is alarm(including standing wave alarm)
and the board is faulty.
On (including high-
frequency flash)
Indicates an alarmRedALM
The DTMU is sending configurationparameters to the DDPU or the DDPU is
loading software programs.
Fast flash (2.5 Hz)
The board is running normally.Slow flash (0.5 Hz)
There is no power supply or the board is
faulty.Off
There is power supply and the board is faulty.OnIndicates the DDPU isrunning and powerd on
GreenRUN
MeaningStatusDescriptionColorIndicator
RUN
ALMVSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
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Interface on DDPU
RF jumper portDIN (female)ANTB
RF jumper portDIN (female)ANTA
Diversity 4 output portSMA (female)RXB4Diversity 3 output portSMA (female)RXB3
Diversity 2 output portSMA (female)RXB2
Diversity 1 output portSMA (female)RXB1
Main 4 output portSMA (female)RXA4
Main 3 output portSMA (female)RXA3
Main 2 output portSMA (female)RXA2
Main 1 output portSMA (female)RXA1
Input of the TX signals sent from the DTRUInput of the DCOM combining signals
N (male)TXB
Input of the TX signals sent from the DTRUInput of the DCOM combining signals
N (male)TXAPower supply input3V3POWER
Sends to the DDPU control signals, communication signals,
clock signals and subrack number
DB26
(female)COM
DescriptionTypeInterface
RUN
ALMVSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
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Functions of DCOM
The DCOM is placed in the DAFU subrack
with the DDPU
The DCOM is optional and there are a
maximum three DCOMs. The DTRU
combines two carriers into one channel. The
DCOM is required when the DTRUs are
insufficent
The DCOM combines the 2-route DTRU
transmission signals and outputs them to the
DDPU
DCOM
TX-COM
TX2
TX1
ONSHELL
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Interfaces on DCOM
TX signal input from the DTRU to DCOMN (male)TX2
TX signal input from the DTRU to DCOMN (male)TX1
Output of combining signals from the DCOM
to DDPU
N (male)TX—
COM
For indentification of the board type of DCOM
and on-site status
DB26
(female)
ONSHEL
L
DescriptionTypeInterface
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Functions of FAN BOX
The FAN BOX forms a loop with the air inlet box to provide forced
ventilation and dissipation for the common subrack, the DTRU subrack,
and the DAFU subrack
The FAN Box is mandatory with four independent axial flow fans. The
fans' speed and running status are controlled by the Fan Controlling and
Monitoring Board
FANSTATE
COM
PWR
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Indicators on FAN BOX
There is no power supply and the
board is faulty
OffGreen or red or
orange
The board software is being ungradedOnOrange (red
and green)
The board is running normallySlow flash (0.5
Hz)
Green
Alarm occurs to the boardFast flash (4 Hz)Red
Communication between the NFCB
and the DTMU is abnormal. There is
no alarm
Fast flash (4 Hz)GreenSTATE
MeaningStatusColorIndicator
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Chapter 1 OverviewChapter 1 Overview
Chapter 2 System ComponentsChapter 2 System Components
Chapter 3 Signal ProcessingChapter 3 Signal Processing
Chapter 4 Antenna and Feeder SystemChapter 4 Antenna and Feeder System
Chapter 5 Typical configurationChapter 5 Typical configuration
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System Signal Flow
the signal flow of the service and signaling includeDL Signal Flow
UL Signal Flow
Signaling Processing Signal Flow
Clock Signal Flow
Combined Cabinet Signal Flow
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DL Signal Flow
DD
PU
Um
BSC
BTS3012 Cabinet
MSAntennaFeeder
Abis
DT
RU
DTMU
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DL Signal Flow
The DL signal flow includes the following steps:
The DTMU receives the service data from the BSC,
exchanges and processes it, and then transfers it to the
DTRU
The DTRU performs digital filtering, up conversion, and
filter amplification of the signals and sends the signals tothe DDPU
The duplexer in the DDPU filters the signals sent from the
DTRU and transmits the signals through antennas and
feeders
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UL Signal Flow
DA
FU
Um
BSC
BTS3012 Cabinet
MSAntennaFeeder
Abis
DT
RU
DTMU
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UL Signal Flow
The UL signal flow includes the following steps:
The antenna receives the signals transmitted from the MS. After being
amplified by the TMA, the signals are transmitted to the DDPU through
the feeder.The TMA is optional. It is used to compensate the feeder loss
and enhance receiver sensitivity of the DDPU antenna port
The DDPU receives the signals and transmits the signals to the DTRUafter they are filtered by the duplexer and amplified by the LNA
The DTRU receives the signals and transmits the signals to the DTMU
after amplification and down conversion. The DTMU then transmits the
signals to the BSC through the Abis interface
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Signaling Processing Signal Flow
BTS3012
DDPUDTRUDTMU
BSCAbis
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Signaling Processing Signal Flow
The signaling processing signal flow includes the following steps:
The Abis interface board receives the signaling data from the BSC
and transmits the data to the DTMU
The DTMU performs decision and processing on the signaling and
transmits the signaling to the DTRU and DDPU
The DTRU and DDPU report board status to the DTMU
The DTMU obtains the status of the BTS3012 by collecting and
analyzing the status of all boards and transmits the information to
the BSC through the Abis interface
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Clock Signal Flow
DTMUBoards in main
cabinet
Boards in slavecabinet
A-bis
Clock distributioncable between
cabinets
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Clock Signal Flow Description
The clock signal flow includes the following steps:
The external reference clock is transmitted to the clock
module in the DTMU through the Abis interface
The clock module performs phase lock and frequency
division on the clock signals to generate different clock
signals for BTSs The clock signals are transmitted to the modules in the
main cabinet such as the DTRU and the DDPU
The clock signals are transmitted to the modules in the
slave cabinets through the clock distribution cable
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Chapter 1 OverviewChapter 1 Overview
Chapter 2 System ComponentsChapter 2 System Components
Chapter 3 Signal ProcessingChapter 3 Signal Processing
Chapter 4 Antenna and Feeder SystemChapter 4 Antenna and Feeder System
Chapter 5 Typical configurationChapter 5 Typical configuration
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Antenna Feeder subsystem
Antenna
TMA
Antennasupport
Jumper
JumperFeeder
Jumper
AntennaFeeder
JumpersTMA
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Antenna In mobile communications systems, the antenna consists of an
array of element antennas, as shown in Figure
Element
antenna
Feeding
network
Antenna
connector
Directional antenna Omnidirectional antenna
Feeding
network
Element
antenna
Feeding
network
Antennaconnector
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Antenna
BTS3012 antennas are classified:
By radiation features in horizontal directions: omnidirectional
antennas and directional antennas
By polarization features: single polarization antennas and dual
polarization antennas
Omnidirectional
antennaSingle p olarization
antenna
Dua l polarization
antenna
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Lightning Arrester is used to
prevent the equipment from being
damaged by the lightening current
inducted by the core line of the
feeder
feeder
jumper
Lightning Arrester
Lightning Arrester
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Types of Main Feeder
7/8 inch
Cable loss=0.043dB/m
5/4 inch
Cable loss=0.032dB/m
1/2 inch jumper
Cable loss=0.11dB/m
Used between the antenna and the main feeder
Between the antenna and the tower-top amplifier
Between the cabinet and the lightning arrester
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TMA
The tower mounted amplifier (TMA) is a low noise amplification module
installed on the tower top. The TMA is optional. The triplex TMA is usually
used and installed close to the antenna. The triplex TMA consists of triplexfilter, low noise amplification, and feeder
Lowernoise
amplific-ation
Sending
filter
Receivingfilter
Bypass
DC
BTS
TMA
Feeder
Receivingfilter
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Antenna Pattern
The antenna pattern describes the radiating abilities of
antennas in all directions
360°
Omni Antenna Directional antenna
120° 90° 65°
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Polarization Two main types of polarization
Vertical polarization
Horizontal polarization
The types of antenna divided by
polarization
Single polarized antenna
− Vertical polarization for GSM
− One port for one feeder
Dual polarized antenna− +45 degree and -45 degree
− Two ports for two feeders
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Chapter 1 OverviewChapter 1 Overview
Chapter 2 System ComponentsChapter 2 System Components
Chapter 3 Signal ProcessingChapter 3 Signal Processing
Chapter 4 Antenna and Feeder SystemChapter 4 Antenna and Feeder System
Chapter 5 Typical configurationChapter 5 Typical configuration
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Configuration Principles
The configuration principles of the BTS3012 cabinet are as follows:
The minimum antenna rule
use as few as possible antennas for cell configuration.
The minimum cabinet rule
use as few as possible cabinets for cell configuration.
The complete synchronous cell ruleall TRXs of a synchronous cell are configured in the same cabinet group
The basic cabinet priority rule
TRXs are configured in the basic cabinet in preference, and the number
of TRXs in the basic cabinet is not less than that in any extension cabinet
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Configuration Principles
The BTS3012 supports the omnidirectional coverage and the directional
coverage.
The BTS3012 supports the combination of two cabinets to form one group
and the combination of three cabinet groups.
The BTS3012 supports the transmit diversity and 4-way diversity receive.
The DCOM combines two carriers into one channel (the two-into-onefunction). The DCOM is required when the DTRUs are not sufficient.
The BTS3012 uses DTRU. One single cabinet supports up to 12 TRXs in
full configuration.
The maximum number of carriers is eight in a cell with a pair of dual
polarization antennas or two omnidirectional antennas of a single
sectorized cell
Typical configuration S1/1/1
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yp g
(transmit independence mode)
S1/1/1 transmit independence mode,
Each cell is configured one DTRU and
one DDPU.
The connection for one cell is showed
in the right slide
BSC data configuration should be :
transmit independence mode ,receive
independence mode
Cabinet Top power(dBm):(46 or
47.8)-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
Typical configuration S1/1/1
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(transmit diversity+4-way receive diversity)
S1/1/1 transmit diversity+4-way
receive mode,each cell is
configured one DTRU and twoDDPU
BSC data configuration should be :
transmit diversity mode
4-way receive mode
Cabinet Top power(dBm):
(46 or 47.8)-1.0
DTRU
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
Typical configurationS2/2/2
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(transmit independence mode)
S2/2/2 transmit independence mode,
Each cell is configured one DTRU and
one DDPU
The connection for one cell is showed in
the right slide
BSC data configuration should be :
transmit independence mode ,receive
diversity mode
Cabinet Top power(dBm):(46 or
47.8)-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
Typical configurationS2/2/2
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(PBT mode)
S2/2/2 PBT mode,each cell is
configured two DTRU and oneDDPU
The connection for one cell is
showed in the right slide
BSC data configuration should be :
PBT mode
receive independence mode
Cabinet Top power(dBm):49
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
Typical configuration S4/4/4
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( wideband transmit combination mode)
S4/4/4 wideband transmit combination
mode ,each cell is configured two
DTRU and one DDPU
BSC data configuration should be :
wideband transmit combination
mode ,receive diversity mode
Cabinet Top power(dBm):(46 or
47.8)-3.3-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical Configuration S1/2/1
S1/2/1,cell1 and cell 3 need
share one DTRU, cell 2 need
configure one DTRU and oneDDPU.
BSC data configuration
should be :
DTRU1:transmit
independence mode,receive
independence mode;
DTRU2:transmit
independence mode ,
receive independence
diversity mode DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical configuration S8/8/8
S8/8/8 cell 1 and cell 3
are configured 4
DTRU,2 DCOM and 1DDPU
BSC data configuration
should be :wideband
transmit combination
mode ,receive diversity
mode
Cabinet top power
(dBm):(46 or 47.8)
-3.3-3.3-1.0DTRU
TX 1
TCOM
TX 2
IN2
IN 1
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
Typical configuration S8/8/8
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S8/8/8 cell2 is
configured 4 DTRU,2
DCOM and 2 DDPU, cell
2 need cross the cabinet
BSC data configuration
should be:wideband
transmit combinationmode ,receive diversity
mode
Attention:only support
frequency hopping
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
RF-EX1
RF-EX2
RF-EX3
RF-EX4
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
RF-EX1
RF-EX2
RF-EX3
RF-EX4
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Combined Cabinet Signal Flow
The connection of the signal cables of the combined cabinet is as
follows:The main and slave cabinets are connected by the data cables,
control cables, and clock cables
The main and slave combined cabinets are connected by the clock
cables and control cablesThe main and slave cabinets and combined cabinets require the
DIP switches
Slave
cabinet
of main
cabinet
group
Main
cabinet
of main
cabinet
group
Main
cabinet
of
slave
cabinet
group
Slave
cabinet
of
slave
cabinet
group
Data cable
Clock cable
Control cable
Clock cable
Control cableData cable
Clock cable
Control cable
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Functions and features of BTS3012
BTS3012 hardware structure
Antenna and feeder system
Typical configuration
SummarySummary
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