Download - GSM HUAWEI BTS3012 Hardware Structure
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Internal
HUAWEI BTS3012
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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 Typical configurationChapter 4 Typical configuration
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Location
MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller
HLR: Home Location Register AUC: Authentication Center EIR: Equipment Identity Register
MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center
VM: Voice Mailbox OMC: Operation and Maintenance Center
PSTN ISDN
PSPDN
Um Interface
BTS3012
BTS3012
BTS3012
BTS3012
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAPMAP
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 Typical configurationChapter 4 Typical configuration
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Hardware structure
TMA TMA
DTRU DAFU
Antenna and feeder subsystem
Forepart of RFSubsystem
TMA TMA
DTRU DAFU
TMA TMA
DTRU DAFU
Double transceiver subsystem
DATU
Um Interface
DATU
fiber
E1
Abis Interface
MELC
Common subsystem
NFCB
Metro 100
DTMU
DEMU
E1
BITSMonitor
TBUS/DBUS/CBUS
MS
FH_BUS
Extension cabinet
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BTS3012 Cabinet and Boards D D D D
Wiring & Air Inlet
Wiring
DDPU
DCOM
DCOM
DDPU
DCOM
DTRU
DTRU
DTRU
DTRU
DTRU
DTRU
Wiring
FAN
Air Inlet
MLC
Power and EMC
Transmission Unit
DDPU
ELC
ELC
SAC
Transmission Unit
DTMU
DTMU
DEMU
DC
CU
DC
SU
DAT
U
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BTS3012 Cabinet and Boards
Abbreviations Description
DTRU Double Transceiver Unit
DTMU Transmission & Timing & Management Unit for DTRU BTS
DCCU Cable Connection Unit for DTRU BTS
DAFU Antenna Front-end Unit for DTRU BTS
DDPU Dual Duplexer Unit for DTRU BTS
DCOM Combining Unit for DTRU BTS
DATU Antenna and TMA Control Unit for DTRU BTS
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
DCSU Combined cabinet Signal connection Unit for DTRU BTS
DEMU Environment Monitoring Unit for DTRU BTS
DCTB Cabinet Top Backplane for DTRU BTS
FAN Box NodeB Fan Controlling and monitoring Board
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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
Provides BITS synchronized clock inputs Provides data backup between the active and standby boards Provides the 10 Mbit/s Ethernet port for maintenance Supports four E1 inputs by default or eight E1 inputs if required Controls, maintains, and operates the BTS Downloads software for the BTS Provides fault management, configuration management, performance managem
ent, and security management Provides centralized clock distribution and management of the entire BTS, and th
e hot backup of the clock unit Provides backup for the E1 ports and the main control unit Provides eight digital alarm inputs, two of them being lightning arrester failure ala
rm inputs Provides four extended digital control signal outputs Monitors the external fan control board and the power modules
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Structure of DTMU
MCK
OML
DBUS
CBUS2
Clock
BIUDTRU
DTMU
BSC
MCUMMI
LMT
Abis
External
synchronizedclockSubrack number
and clock
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LEDs on the DTMU panel
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
LED Color Description Status Meaning
RUN Green Operating indicator of the board
Slow flash (on for 2s and off for 2s)
The OML is blocked.
Slow flash (on for 1s and off for 1s)
Normal
Fast flash at unfixed intervals
The BSC is loading data.
Off There is no power input for the board.
ACT Green Active/standby status indicator
Off Standby board
On Active board
PLL Green Clock status indicator
Off The clock is abnormal.
On Free-run
Fast flash (on for 0.125s and off for 0.125s)
Pull-in
Fast flash (on for 0.5s and off for 0.5s)
Locked
LIU1 Green Transmission status indicator of E1 port 1 or port 5
Off E1 port 1 is normal when SWT is off.
E1 port 5 is normal when SWT is on.
On E1 port 1 near end alarm occurs when SWT is off.
E1 port 5 near end alarm occurs when SWT is on.
Fast flash (on for 0.125s and off for 0.125s)
E1 port 1 remote end alarm occurs when SWT is off.
E1 port 5 remote end alarm occurs when SWT is on.
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LEDs on the DTMU panel
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
LED Color Description Status Meaning
LIU2 Green Transmission status indicator of E1 port 2 or port 6
Off E1 port 2 is normal when SWT is off.
E1 port 6 is normal when SWT is on.
On E1 port 2 near end alarm occurs when SWT is off.
E1 port 6 near end alarm occurs when SWT is on.
Fast flash (on for 0.125s and off for 0.125s)
E1 port 2 remote end alarm occurs when SWT is off.
E1 port 6 remote end alarm occurs when SWT is on.
LIU3 Green Transmission status indicator of E1 port 3 or port 7
Off E1 port 3 is normal when SWT is off.
E1 port 7 is normal when SWT is on.
On E1 port 3 near end alarm occurs when SWT is off.
E1 port 7 near end alarm occurs when SWT is on.
Fast flash (on for 0.125s and off for 0.125s)
E1 port 3 remote end alarm occurs when SWT is off.
E1 port 7 remote end alarm occurs when SWT is on.
LIU4 Green Transmission status indicator of E1 port 4 or port 8
Off E1 port 4 is normal when SWT is off.
E1 port 8 is normal when SWT is on.
On E1 port 4 near end alarm occurs when SWT is off.
E1 port 8 near end alarm occurs when SWT is on.
Fast flash (on for 0.125s and off for 0.125s)
E1 port 4 remote end alarm occurs when SWT is off.
E1 port 8 remote end alarm occurs when SWT is on.
SWT Green Indicates the transmission status of E1 links
When the DTMU supports eight E1 routes, the SWT status is slow flash (on for 10s and off for 10s).
When the SWT is off, LIU1 to LIU4 indicate the transmission status of E1 port 1 to 4.
When the SWT is on, LIU1 to LIU4 indicate the transmission status of E1 port 5 to 8.
When the DTMU supports four E1 routes, the SWT LED is always off.
LIU1 to LIU4 indicate the transmission status of E1 port 1 to 4.
ALM Red Alarm indicator
Off No board alarm
On An alarm is generated.
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Ports on the DTMU panel
Port Type Function
T2M SMA female connector 2 MHz reference clock, used to test and tune clock precision
FCLK SMA female connector 216.7 Hz frame clock
T13M SMA female connector 13 MHz reference clock, used to test and tune clock precision
MMI RJ45 connector Terminal maintenance port
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Functions of DEMU The DEMU guarantees the normal operation of the BTS by monitoring the
surrounding environment.
The DEMU performs the following functions:
Monitors the environment information sent from the smoke sensor,
water sensor, temperature and humidity sensor, infrared sensor, and
door control sensor.
Collects alarm information and reports it to the DTMU.
Provides 6 Boolean value outputs and 32 Boolean value inputs.
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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. The DCSU is a mandatory board.
Only one DCSU can be configured.
The DCSU performs the following functions:
Transmits clock signals, data signals, and control signals between the
main cabinet and the extension cabinet.
Transmits the clock signals, data signals, and control signals from the
DTMU to the DTRU ( for BTS3012Ⅱ) or QTRUs ( for 36TRXs).
Transmits the in-position signals of the DCOM, DDPU, or DFCU in th
e DAFU subrack to the DCMB. ( for BTS3012Ⅱ) Transmits the in-position signals of the DDPU located in the DAFU su
brack to the DCMB. ( for 36TRXs).
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Ports on the DCSU panel
CC_IN
CC_OUT
TO_DTRB
TOP2
DCSU
Silk-Screen
Type Description
CC_OUT MD64 female connector
Connects with the cable for combined cabinets when the cabinet serves as the main cabinet and connects with the RF cable when the cabinet serves as the extension cabinet
CC_IN MD64 female connector
Connects with the RF cable when the cabinet serves as the main cabinet and connects with the cable for combined cabinets when the cabinet serves as the extension cabinet
TO_DTRB MD64 female connector
Connects to the DTRB through cables
TOP2 DB26 female connector
Connects to the DCTB in the set-on-top subrack of the BTS3012 cabinet through cables
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GM51DCSU VERBSW6
SW9
SW14
SW13
SW12
SW7
SW10
SW8
SW5
SW4
SW3
SW11
SW2
SW1
Switches of DCSU
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DIP Switches
SW2–SW5 Function
All ON Main cabinet and
All OFF Extension cabinet
Remove the cable connected to the CC_IN of the DCSU of the Main
cabinet and plug it to CC_OUT of the main cabinet
Connect the DCS cable to the DCF port of the TOP of two cabinets
SW1 Description
All ON Main cabinet of the main cabinet group
All OFF Others
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Functions of DCCU The DCCU is placed in slot 6 of t
he DCMB in the common subrac
k. The DCCU is a mandatory boa
rd. Only one DCCU can be confi
gured.
The DCCU performs the followin
g functions:
Transfers E1 signals.
Transfers the control signals f
or the fans.
Transfers the clock signals from the DAFU subrack.
Processes the power inputs t
hrough the EMI filter, and the
n transmits the power to the c
ommon subrack.
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Ports on the DCCU panel
POWER
DCCU
To_FAN
TO_TOP1
TRAN
Port Type Description
TRAN MD64 female connector
Importing E1 signals
To_FAN DB26 female connector
Connecting to the fan box through cables
TO_TOP1 MD64 female connector
Connecting to the DCTB in the set-on-top subrack of the BTS3012 through cables
POWER 3V3 power connector
Importing power to the common subrack
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Functions of DATU
The DATU can be installed in slot 2, 3, 4, or 7 of the
DCMB in the common subrack. The DATU is an opti
onal board. A maximum of two DATUs can be config
ured.
The DATU performs the following functions:
Controls the RET antenna.
Provides power for the TMA over the feeder.
Reports alarms related to the control of the RET a
ntenna.
Monitors the current from the feeder.
DATU
RUN
ACT
ALM
ANT0
ANT1
ANT2
ANT3
ANT4
ANT5
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Relation between boards and slot numbers
Board Slot No.
DTMU Slots 0 and 1
DEMU Slots 2, 3, 4,or 7
DATU Slots 2, 3, 4,or 7
DCSU Slot 5
DCCU Slot 6
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Signal Protection 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
DC
F
CK
B2
CK
B1
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Functions of DMLC
The DMLC is configured in slot 0, 1, or 2 of the set-on-
top subrack. The DMLC is an optional board, which is
used with the DEMU. Only one DMLC is required in ful
l configuration.
The DMLC performs the following functions:
Provides lightning protection for Boolean input and
output signals.
Provides lightning protection for analog signals that
are transmitted from the smoke sensor, water sens
or, door control sensor, infrared sensor, humidity an
d temperature sensor.
SWIN
SWOUT
DMLC
AIN
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Functions of DELC
The DELC is configured in slot 0, 1, or 2 of the set-
on-top subrack. These three slots are shared by th
e DELC and DMLC. The DELC is a mandatory boa
rd. At least one DELC should be configured.
The DELC provides lightning protection for 4 routes
of E1 signals. A maximum of three DELCs can be c
onfigured to provide lightning protection for 12 rout
es of E1 signals.
The DELC performs the following functions:
Provides lighting protection for E1 signals.
Transmits E1 signals to the DCCU, through whi
ch the signals are sent to the DTMU for process
ing.
DELC
TR
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Functions of DSAC
The DSAC is placed in slot 3 of the set-on-top subrack.
The DSAC is a mandatory board. Only one DSAC is r
equired in full configuration.
The DSAC performs the following functions:
Provides six Boolean alarm inputs.
Provides two CBUS3 signal outputs.
Provides two lightning protection arrester failure ala
rm inputs of the power supply.
Provides lightning protection for BITS clock signals.
DSAC
CO
M1
EA
CS
YN
CC
OM
2S
1+
S1
-S2
+S
2-
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Double transceiver subsystem (BTS3012 )Ⅱ
DTRU (Double Transceiver Unit)
DTRB
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Functions of DTRU (BTS3012 )Ⅱ Baseband Processing Part
Processes the signaling, such as coding, decoding, interleaving, de-
interleaving, modulation, and demodulation.
Supports RF loop test and switchover when loop test of phase-lock fails.
Amplifies the output power.
RF Transmitting Part
Demodulates the RF signals into baseband signals, and performs
frequency hopping.
Divides the received RF signals and performs receive diversity.
RF Receiving Part
Demodulates the RF signals into baseband signals, and performs
frequency hopping.
Divides the received RF signals and performs receive diversity.
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Voice A/DA/D8KHz, 13bit Speech
codingSpeech coding
SegmentationSegmentation
20ms
13kbit/sChannel codingChannel coding
InterleavingInterleaving Burst formattingBurst formattingEncryptionEncryption
22.8kbit/s
ModulationModulation
33.8kbit/s
Transmission
Voice Signal Processing
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Functional structure of DTRU (BTS3012 )Ⅱ
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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Panels on DTRU (BTS3012 )Ⅱ
There are two types of
DTRU: type A and type
B. The four LEDs on th
e DTRU panel indicate
the operating status of
the DTRU and other fu
nctional subsystems.
DTRU (type A) has 10
ports and DTRU (type
B) has 8 ports. These
ports exchanges signal
s with the RF front-end
subsystem.
DTRU panel (type
A) DTRU panel (type B)
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LEDs on the DTRU panel
LED Color Description Status Remarks
RUN Green Operating and power-on indicator of the DTRU
On There is power supply. However, the module is faulty.
Off There is no power supply or the module is faulty.
Slow flash (on for 2 s and off for 2 s)
The module is starting.
Slow flash (on for 1 s and off for 1 s)
The module works normally.
Fast flash (on for 0.2 s and off for 0.2 s)
The DTMU is issuing configuration data to the DTRU.
ACT Green Operating indicator of the transceiver
On The DTRU is operating. (The DTMU issuing configuration data normally and the cells starts) All the channels on the two TRXs operate normally.
Off The communication between the DTRU and the DTMU is not established.
Slow flash (on for 1 s and off for 1 s)
A part of logical channels work normally (before and after TRX mutual aid).
ALM Red Alarm indicator On (including high-frequency flash)
Critical alarm (The module is faulty.)
Off The module is normal.
RF_IND Red RF indicator On There is voltage standing wave radio (VSWR) alarm.
Off Normal
Slow flash (on for 1 s and off for 1 s)
There is a radio link alarm.
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Ports on DTRU (type A) panel Port Type Remarks
TX1 N female connector
It is the output port for the signals from TRX1.• In transmit independency or transmit diversity mode, the TX port routes the signals
to the TX port of the module in the RF front-end subrack.• In PBT or wideband combination mode, the TX1 port routes the signals to the IN1
port.
IN1 SMA female connector
In PBT or wideband combination mode, the IN1 port is short-circuited with the TX1 port.
TCOM N female connector
In PBT or wideband combination mode, the TCOM port is used to output the combined signals from the IN1 and IN2 ports.
IN2 SMA female connector
In PBT or wideband combination mode, the IN2 port is short-circuited with the TX2 port.
TX2 N female connector
It is the output port for the signals from TRX2.• In transmit independency or transmit diversity mode, the TX port routes the signals
to the TX port of the module in the RF front-end subrack.• In PBT or wideband combination mode, the TX2 port routes the signals to the IN2
port.
RXM1 SMA female connector
• In receive independency or receive diversity mode, it is the input port for the main RF signal.
• In 4-way receive diversity mode, it is the input port for the diversity signal 1.
RXD1 SMA female connector
• In receive independency or receive diversity mode, it is the input port for the diversity RF signal.
• In 4-way receive diversity mode, it is the input port for the diversity signal 2.
RXM2 SMA female connector
• In receive independency mode, it is the input port for the main RF signal.• In 4-way receive diversity mode, it is the input port for the diversity signal 3.
RXD2 SMA female connector
• In receive independency mode, it is the input port for the diversity RF signal.• In 4-way receive diversity mode, it is the input port for the diversity signal 4.
PWR 3V3 power connector
Power input port
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Ports on DTRU (type B) panel
Port Type Remarks
TX1 N female connector It is the output port for the signals from TRX1.• In transmit independency or transmit diversity mode, the TX port routes the sig
nals to the TX port of the module in the RF front-end subrack.• In PBT or wideband combination mode, this port is suspended.
TCOM N female connector In PBT or wideband combination mode, the TCOM port is used to output the combined signals from the TX1 and TX2 ports.
TX2 N female connector It is the output port for the signals from TRX2.• In transmit independency or transmit diversity mode, the TX port routes the sig
nals to the TX port of the module in the RF front-end subrack.• In PBT or wideband combination mode, this port is suspended.
RXM1 SMA female connector
• In receive independency or receive diversity mode, it is the input port for the main RF signal.
• In 4-way receive diversity mode, it is the input port for the diversity signal 1.
RXD1 SMA female connector
• In receive independency or receive diversity mode, it is the input port for the diversity RF signal.
• In 4-way receive diversity mode, it is the input port for the diversity signal 2.
RXM2 SMA female connector
• In receive independency mode, it is the input port for the main RF signal.• In 4-way receive diversity mode, it is the input port for the diversity signal 3.
RXD2 SMA female connector
• In receive independency mode, it is the input port for the diversity RF signal.• In 4-way receive diversity mode, it is the input port for the diversity signal 4.
PWR 3V3 power connector
Power input port
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DTRU transmit modes
Transmit independency
Transmit diversity
PBT
Wideband combination
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DTRU transmit mode-transmit independency
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 combination
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
combinercombiner
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DTRU receive modes
Receive independency
Receive diversity
4-way receive diversity
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DTRU receive mode- Receive independency
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 (BTS3012 )Ⅱ
The DTRB is placed in the DTRU subra
ck. The DTRB provides six slots to hou
se the DTRUs.
The DTRB connects the DCSU with the
DTRU.
The DTRB performs the following functi
ons:
Provides bus connection between th
e common subsystem and the doubl
e-transceiver subsystem.
Specifies the slot number and rack
number of the DTRU.
Transmits the in-position signals of t
he DTRUs to the DCSU.
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RF Front-End Subsystem (BTS3012 )Ⅱ
The functions of the BTS3012 RF front-end subsystem are pⅡerformed by the boards in the DAFU subrack.
The DAFU subrack can be configured with the DDPU, DCOM,
DFCU, DFCB, or the combination of these modules.
DDPU (Dual Duplexer Unit for DTRU BTS)
DCOM (Combining Unit for DTRU BTS)
DFCU (Filter Combiner Unit for DTRU BTS)
DFCB (Filter Combiner Unit for DTRU BTS)
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Functions of DDPU (BTS3012 )Ⅱ
The DDPU is configured in the DAFU subrack with the DCOM. The
DDPU is an optional module. You can choose to configure DDPU or
DFCU. Generally, three DDPUs are configured. If the DCOM is not
configured, a maximum of six DDPUs can be configured.
The DDPU performs the following functions:
Provides lightning protection through the ANT port.
Detects VSWR alarms in the antenna system.
Receives the gain control signals for the low noise amplifier.
Transmits multiple routes of RF signals from the transmitter to th
e antenna.
Receives signals from the antenna, amplifies and quarters these
signals, and then transmits them to the receiver of the DTRU.
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LEDs on the DDPU panel
RUNALM
VSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTAANTB
LED Color Description Status Meaning
RUN Green Operating and power-on indicator of the DDPU
On There is power supply. However, the module is faulty.
Off There is no power supply or the module is faulty.
Slow flash (on for 1s and off for 1s)
The module works normally.
Fast flash (on for 0.2s and off for 0.2s)
The DTMU is issuing configuration data to the DDPU or the DDPU is loading software programs.
ALM Red Alarm indicator
On (including high-frequency flash)
Alarms (including VSWR alarm). This indicates that there are faults.
Off No alarm
Slow flash (on for 1s and off for 1s)
The DDPU is starting or loading the latest application.
VSWRA Red VSWR alarm indicator for channel A
Slow flash (on for 1s and off for 1s)
There is a VSWR alarm with channel A.
On There is a critical VSWR alarm with channel A.
Off There is no VSWR alarm with channel A.
VSWRB Red VSWR alarm indicator for channel B
Slow flash (on for 1s and off for 1s)
There is a VSWR alarm with channel B.
On There is a critical VSWR alarm with channel B.
Off There is no VSWR alarm with channel B.
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Ports on the DDPU panel
RUNALM
VSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTAANTB
Port Type Description
COM DB26 female connector Receiving control signals, communication signals, and clock signals from the DCTB of the BTS3012
POWER 3V3 power connector Power input port
TXA N female connector• It is the imput port for the signals received from the TX1 or TX2 po
rt from the DTRU.
TXB N female connector
• It is the input port for the combined signals from the TCOM port of the DTRU.
• It is the input port for the combined signals from the TX-COM port of the DCOM.
RXA1
SMA female connectorIt is the output port for the main RF signal received from the ANTA port. It is connected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.
RXA2
RXA3
RXA4
RXB1
SMA female connectorIt is the output port for the diversity RF signal received from the ANTB port. It is connected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.
RXB2
RXB3
RXB4
ANTA
DIN female connector
Antenna port for reception and transmission
• It is the input port for the RF signals received from the antenna.
ANTB
• It is the output port for the RF signals transmitted from the TXA port of the DDPU.
• It is connected to the indoor 1/2-inch jumper of the BTS3012 or to the Bias-Tee.
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Functions of the Fan Box The fan box forms a loop with the air inlet box to provide forced ventilation
and dissipation for the common subrack, DTRU subrack, and DAFU subra
ck.
The fan box performs the following functions:
Monitors the temperature at the air inlet of the cabinet and the tempera
ture in the fan subrack, and then adjusts the speed of the fans.
Communicates with the DTMU to adjust the speed of the fans and rep
ort alarms.
FANSTATE
COM
PWR
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LEDs on the fan box
LED Color Status Description
STATE Green Fast flash (on for
0.125 s and off
for 0.125 s)
The NFCB communicates with the
DTMU abnormally. There is no alarm.
Red Fast flash (on for
0.125 s and off
for 0.125 s)
An alarm is generated.
Green Slow flash (on for
1 s and off for 1
s)
The board operates normally.
Orange (red
and green)
On The software of the board is being
upgraded.
Green or red
or orange
Off There is no power supply or the board
is faulty.
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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 Typical configurationChapter 4 Typical configuration
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Signal Flow of the BTS3012 Ⅱ
The BTS3012 signal flow is associated with the traffic and Ⅱsignaling of the BTS.
The BTS3012 signal flow consists of:Ⅱ
DL traffic signal flow
UL traffic signal flow
Signaling processing signal flow
Signal flow for cabinet groups
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DL Traffic Signal Flow of the BTS3012 Ⅱ
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DL Traffic Signal Flow The DL traffic signal flow is as follows:
The BSC sends E1 signals to the DELC through E1 cables. The DELC provides lightning protection for the received E1 signals, and then send
s the E1 signals to the DCTB. The DCTB sends the E1 signals to the DCCU through the TOP signal cable conne
cting the DCTB with the DCCU/DSCU. The DCCU sends the E1 signals to the DTMU through the ECMB. On receiving the signals, the DTMU converts the E1 signals through the DBUS. Th
e DTMU also assigns the data based on the data configuration on the OML. Then, the signals are sent to the DCSU and the DTRUs in DTRU subrack 0 through the ECMB.
The DCSU sends the signals to the DTRB in DTRU subrack 1 through the signal cable between the DCSU and the DTRB.
The DTRB sends the signals to the DTRUs in DTRU subrack 1. After receiving the signals, the DTRUs in the two DTRU subracks perform digital fil
tering, up-conversion, and filter amplification, and then send the signals to the DDPU/DFCU/DFCB.
The duplexer in the DDPU/DFCU/DFCB filters the signals from the DTRU, and then sends the signals to the antenna subsystem for transmission.
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UL Traffic Signal Flow of the BTS3012 Ⅱ
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UL Traffic Signal Flow
The UL traffic signal flow is as follows:
The antenna receives the signals from the MS. After being amplified by the
TMA, the signals are transmitted to the DDPU/DFCU/DFCB through the fee
der. The TMA is optional. It is used to compensate the feeder loss and enha
nce receive sensitivity of the DDPU/DFCU/DFCB antenna port.
The DDPU/DFCU/DFCB receives the UL signals and transmits the signals t
o the DTRUs in the two DTRU subracks after they are filtered by the duplex
er and amplified by the lower noise amplifier (LNA).
The DTRU in DTRU subrack 1 receives the signals from the DDPU/DFCU/D
FCB and transmits the signals to the DTRB after amplification and down-co
nversion.
The DTRB sends the signals to the DCSU.
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UL Traffic Signal Flow
The DCSU sends the signals to the DTMU through the ECMB. In additi
on, the DTRU in DTRU subrack 0 receives the signals from the DDPU/
DFCU/DFCB, and transmits the signals to the DTMU through the ECM
B after amplification and down conversion.
The DTMU backs up the E1 signals and converts the E1 signals throug
h the DBUS. The DTMU then sends the converted signals to the DCCU
through the ECMB.
The DCCU sends the signals to the DCTB through the TOP signal cable
connecting the DCTB with the DCCU/DSCU.
The DCTB sends the signals to the DELC.
The DELC provides lightning protection for the signals. Then, it sends th
e signals to the BSC through the E1 cables.
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Signaling Flow of the BTS3012 Ⅱ
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Signaling processing flow
The signaling processing flow is as follows:
The BSC sends the signaling data to the DTMU of the BTS.
After processing the signaling, the DTMU sends the signaling to the
DTRU and DDPU (DFCU or DFCB).
The DTRU and DDPU (DFCU or DFCB) report their board status to
the DTMU.
The DTMU obtains the status of the BTS3012 by collecting and ana
lyzing the states of all the boards. Then, it transmits the information
to the BSC through the Abis interface.
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Signal Flow of BTS3012 Cabinet Groups Ⅱ The signal flow of BTS3012 cabinet groups refers to the signal flow
between the main cabinet group and the extension cabinet groups.
The signal flow of cabinet groups involves clock signals and control
signals.
Bus connection between BTS3012 cabinet groups is shown as Ⅱfollows:
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Clock Signals
DTMUBoards in main
cabinet
Boards in slavecabinet
A-bis
Clock distributioncable between
cabinets
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Clock Signals 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 di
vision on the clock signals to generate different clock si
gnals 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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Control Signals
The control signals refer to the CBUS1 signals, which are respo
nsible for the communication between the DTMUs in the main a
nd extension cabinet groups.
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Control Signals Description
The processing of CBUS1 signals is as follows:
The DTMU in the cabinet of the main cabinet group transmits t
he CBUS1 signals to the cabinets in the extension cabinet grou
ps, through signal conversion of relevant boards.
The cabinets in the extension cabinet groups transmit the CBU
S1 signals to the DTMUs in those cabinets, through signal con
version of relevant boards.
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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 Typical configurationChapter 4 Typical configuration
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Functions and features of BTS3012
BTS3012 hardware structure
System Signal Flow
Typical configuration
SummarySummary
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