Ome201102 huawei bts3012 hardware structure issue2.0

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Internal
HUAWEI BTS3012
Hardware Structure
ISSUE 2.0

HUAWEITECHNOLOGIES CO., LTD. Page 2All rights reserved
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

References
 BTS3012 Technical Manual
 BTS3012 Installation Manual
 BTS3012 User Manual

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

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
MAP
M
AP
TUP,ISUPMS
MS
MS

Features and Functions (for 12TRXs)
 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

 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

Features and Functions (BTS3012 - for 18TRXs)Ⅱ
 One cabinet can hold up to 18 TRXs and multiple cabinets can hold up to
54 TRXs.
 Power Boost Technology (PBT): The maximum output power of the TRX
can reach up to 100 W.
 The static sensitivity of the TCH/FS is -112.5 dBm (typical value in normal
temperature).
 Transmit diversity and four-way receive diversity
 Baseband frequency hopping and RF frequency hopping
 Multiple transmission modes: E1, T1, STM-1, microwave, and satellite
transmission
 Multiple frequency bands: 850MHz, 900MHz, 1800MHz, and 1900MHz.
The cabinet can meet the deployment requirements in different regions.

 Holds up to 36 TRXs per cabinet.
 Supports the Hub BTS function.
 Supports soft synchronization on the Um interface.
 Supports rapid switchover of the ring topology.
 Supports Flex Abis networking.
 Supports optimized Abis transmission.
 Supports local switching.
 Supports Abis over IP.
 Supports clock over IP.
 The static sensitivity of the TCH/FS is -113 dBm (typical value in
normal temperature).
 Supports various transmission modes: E1, FE, T1, STM-1,
microwave, and satellite transmission.
 Supports the 900 MHz frequency band.

Hardware structure (for 12TRXs)
TMA TMA
DTRU DAFU
Antenna and feeder
subsystem
Forepart of RF
Subsystem
TMA TMA
DTRU DAFU
TMA TMA
DTRU DAFU
Double transceiver
subsystem
DATU
Um Interface
DATU
fiber
E1
Abis Interface
M
E
L
C
Common subsystem
NFCB
Metro 100
DTMU
DEMU
E1
BITS
Monitor
TBUS/DBUS/CBUS
MS
FH_BUS
Extension
cabinet

BTS3012 Cabinet and Boards (for 12TRXs)
D D D D
Wiring & Air Inlet
Wiring
D
D
P
U
D
C
O
M
D
C
O
M
D
D
P
U
D
C
O
M
D
T
R
U
D
T
R
U
D
T
R
U
D
T
R
U
D
T
R
U
D
T
R
U
Wiring
FAN
Air Inlet
M
L
C
Power and
EMC
Transmission Unit
D
D
P
U
E
L
C
E
L
C
S
A
C
Transmission Unit
D
T
M
U
D
T
M
U
D
E
M
U
D
C
C
U
D
C
S
U
D
A
T
U

BTS3012 Cabinet and Boards (for 18TRXs & for 36TRXs )
For 18 TRXs For 36 TRXs

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

Subrack Board/Module Full Name Configuration Quantity in One
Cabinet
Full
Configuration
Minimum
Configuration
Common subrack
DTMU Transmission/Timing/Management Unit for DTRU BTS 2 1
DEMU Environment Monitoring Unit for DTRU BTS 1 0
DATU Antenna and TMA Control Unit for DTRU BTS 2 0
DCSU Combined cabinet Signal connection Unit for DTRU BTS 1 1
DCCU Cable Connection Unit for DTRU BTS 1 1
ECMB Enhanced Common Module Backplane for DTRU BTS 1 1
Set-on-top
subrack
DELC E1 Signal Lightning-Protection Card for DTRU BTS 3 1
DMLC Monitor Signal Lightning-Protection Card for DTRU BTS 1 0
DSAC Signal Access Card for DTRU BTS 1 1
DCTB Cabinet Top Backplane for DTRU BTS 1 1
DTRU subrack
DTRU Double-Transceiver Unit 9 1
DTRB Double-Transceiver Unit Backplane 1 1
DAFU subrack
DCOM Combining Unit for DTRU BTS 3 0
DDPU Dual-Duplexer Unit for DTRU BTS 6 0
DFCU Filter Combiner Unit for DTRU BTS 3 0
DFCB Filter Combiner Unit for DTRU BTS 1 0
Fan subrack Fan box Fan Module 1 1

Subrack Board/
Module
Full Name Number of Boards or Modules
Configured in a Single Cabinet
Full
Configuration
In Minimum
Configuration
Common
subrack
DTMU Transmission/Timing/Management Unit for DTRU BTS 2 1
DEMU Environment Monitoring Unit for DTRU BTS 1 0
DATU Antenna and TMA Control Unit for DTRU BTS 2 0
DPTU Packet Transmission Unit 2 0
DABB Abis Bypass Board for DTRU BTS 1 0
DCSU Combined cabinet Signal connection Unit for DTRU BTS 1 1
DCCU Cable Connection Unit for DTRU BTS 1 1
DCMB Common Module Backplane for DTRU BTS 1 1
Set-on-top
subrack
DELC E1 Signal Lightning-Protection Card for DTRU BTS 3 1
DMLC Monitor Signal Lightning-Protection Card for DTRU BTS 1 0
DSAC Signal Access Card for DTRU BTS 1 1
DCTB Cabinet Top Backplane for DTRU BTS 1 1
QTRU subrack
QTRU Quadruple-Transceiver Unit 6 1
DTRB Double-Transceiver Unit Backplane 1 1
DAFU subrack DDPU Dual-Duplexer Unit for DTRU BTS 3 1
Power subrack
(only for the
cabinet using
+24 V DC
power)
PSU Power Supply Unit 4 1
Fan subrack Fan box Fan Module 1 1

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
 DPTU Packet Transmission Unit (For 36 TRXs)
 DABB Abis Bypass Board for DTRU BTS (For 36 TRXs)

Comparison of Component Boards
For 12 TRXs For 18 TRXs For 36 TRXs
Component
Boards of
Common
Subsystem
DTMU DTMU DTMU
DEMU DEMU DEMU
DCSU DCSU DCSU
DCCU DCCU DCCU
DATU DATU DATU
ECMB DPTU
DABB

Functions of DTMU
 Provides external GPS inputs
 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
management, and security management
 Provides centralized clock distribution and management of the entire BTS, and
the 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
alarm inputs
 Provides four extended digital control signal outputs
 Monitors the external fan control board and the power modules

Structure of DTMU
MCK
OML
DBUS
CBUS2
Clock
BIU
DTRU
DTMU
BSC
MCU
MMI
LMT
Abis
External
synchronized clock
Subrack number
and clock

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/stand
by 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 Transmissio
n 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.

LEDs on the DTMU panel
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
n status
indicator of
E1 port 2 or
port 6
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.
n status
indicator of
E1 port 3 or
port 7
off for 0.125s)
n status
indicator of
E1 port 4 or
port 8
off for 0.125s)
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.

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

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.

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 BTS3012 ) or QTRUs ( for 36TRXs).Ⅱ
 Transmits the in-position signals of the DCOM, DDPU, or DFCU in
the DAFU subrack to the DCMB. ( for BTS3012 )Ⅱ
 Transmits the in-position signals of the DDPU located in the DAFU
subrack to the DCMB. ( for 36TRXs).

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

GM51DCSU VERB
SW6
SW9
SW14
SW13
SW12
SW7
SW10
SW8
SW5
SW4
SW3
SW11
SW2
SW1
Switches of DCSU (for 12TRXs)

Functions of DCCU
 The DCCU is placed in slot 6 of
the DCMB in the common
subrack. The DCCU is a
mandatory board. Only one
DCCU can be configured.
 The DCCU performs the
following functions:
 Transfers E1 signals.
 Transfers the control signals
for the fans.
 Transfers the clock signals
from the DAFU subrack.
 Processes the power inputs
through the EMI filter, and
then transmits the power to
the common subrack.

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

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
optional board. A maximum of two DATUs can be
configured.
 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
antenna.
 Monitors the current from the feeder.
DATU
RUN
ACT
ALM
ANT0
ANT1
ANT2
ANT3
ANT4
ANT5

Functions of ECMB (for 18TRXs)
 The ECMB is the backplane for the common subrack and DTRU subrack 0. The
ECMB is a mandatory board. There are 10 slots on the ECMB.
 The ECMB provides power and signal circuits for the boards in the common
subrack and DTRU subrack 0. The ECMB transmits signals from the boards in the
common subrack to the DCCU. The ports on the DCCU then transmit the signals to
the boards in other subracks. The ECMB transmits the in-position signals of the
DTRUs in DTRU subrack 0 to the DTMU.
 The ECMB performs the following functions:
 Provides signal circuits for connecting the boards in the common subrack.
 Provides –48 V power circuits for the boards in the common subrack.
 Provides bus connection between the common subsystem and the double-
transceiver subsystem.
 Specifies the slot number and rack number of the DTRUs in DTRU subrack 0.
 Transmits the in-position signals of the DTRUs in DTRU subrack 0 to the
DCCU.

Functions of DPTU (for 36TRXs)
 The DPTU is packet transmission unit. The DPTU is
mandatory. A maximum of two DPTUs can be configured. The
DPTU can be installed in slot 3 or 4 (from left to right) in the
common subrack. You can configure two DPTUs in
active/standby mode. When the DABB is configured, the DPTU
cannot be configured.
 The DPTU performs the following functions:
 Provides the interface for Abis over IP.
 Provides the BTS with the convergence function of a Hub.
 Provides the functionality of Clock Over IP.
 Provides the functionality of transmission QoS.

Working Environment of the DPTU (for 36 TRXs)
 Working Environment of the DPTU in the BTS3012
 The DPTU accesses external E1 signals.
 The DPTU transmits E1 signals for the DTMU.

 Working Environment of the DPTU with Transmission Over IP
 The DPTU accesses the transmission network through the
FE signal cable.
 The DPTU transmits E1 signals through the BUS E1 cable.
 The DPTU transmits and converges signals for the lower-
level BTS through E1 cable.

 Working Environment of the DPTU with HubBTS
 The DPTU transmits E1 signals for the BTS main cabinet group
through BUS E1cable, and transmits E1 signals for the BTS
extension cabinet group through E1 cable.
 The DPTU enables the BTS to be connected to the BSC in the form
of HDLC Over E1 or IP Over FE.
 The DPTU enables the lower-level BTSs to be connected in the
form of HDLC Over E1.

LEDs on the DPTU panel
RUN Green Operating
indicator of
the board
Steady on The power input is normal,
but the board is faulty.
Steady off There is no power supply
or the board is faulty.
Slow flash (on for 1s
and off for 1s)
The board is operational.
Slow flash (on for 2s
and off for 2s)
The board is being tested.
Fast flash (on for
0.125s and off for
0.125s)
The board is loading
software.
ACT Green Active/stand
by status
indicator
Steady off Standby board
Steady on Active board
ALM Red Indicates
whether
there are
alarms
Steady off No board alarm
On (including high-
frequency flash)
An alarm is generated.

Ports on the DPTU panel
Port Type Function
FE0 RJ45 connector Connects the transmission equipment or the
BSC so that 100 Mbit/s signals can be
transmitted and received.FE1
E1/T1 TRAN MD64 female
connector
Receives eight E1 inputs
E1/T1 MS MD64 female
connector
Port for short-circuiting active and standby
DPTUs

Functions of DABB (for 36TRXs)
 The DABB is the bypass board for E1 signals. It is an optional board.
Only one DABB can be configured. When the DABB is configured, the
DPTU cannot be configured.
 The functions of the DABB include:
 Bypass Function
− In chain topology, when the BTS where the DABB is located is
power off, the DABB can immediately set up the connection
between BTSs. Thus, the services will not be disrupted. In chain
topology, the BSC can identify the transmission disruption and
BTS power failure.

Functions of DABB （ for 36TRXs ）
 Terminal Loopback
− When the DABB is configured in the BTS of the lowest level in
chain topology, you can perform E1 loopback. When the BTS is
power off, you can set the DIP switch of the DABB to short-circuit
the transmission cable. In this way, you can perform remote
loopback on transmission cables to locate faults.
 Function of Bypass Board In Position Report
− The DABB provides the DTMU with DABB type and in-position
information of the DABB. Thus, the DTMU can determine the
assignment mode of the OML timeslots.

Working Environment of the DABB (for 36 TRXs)
 Working Environment of the DABB in the BTS3012
 When the BTS3012 is working normally, the DABB transfers
E1 signals for the DTMU.

 Working Environment of the DABB With Bypass Function
 The figure below shows the working environment of the
DABB when the BTS3012 is working normally.

 Working Environment of the DABB With Bypass Function
 When the BTS3012 is power off, the DABB supports the bypass
function to transfer E1 signals so that the upper-level BTS and
lower-level BTS can be connected.
 The figure below shows the working environment of the DABB when
the BTS3012 is power off.

 Working Environment of the DABB With Terminal Loopback Function
 When the DABB is configured the lowest level in the chain topology,
you can perform terminal loopback on the DABB through DIP switch
so that the transmission path between the BTSs can be formed.

LEDs on the DABB panel
PWR Green Power
indicator
Steady on The power supply to the DABB is
normal.
Steady off The DABB is power off.
ACT Green Status
indicator
Steady on The E1 cable is not bypassed.
Steady off The board is bypassed.
TEST Red Test indicator Steady on The key TEST is pressed.
Steady off The key TEST is not pressed.

Ports on the DABB panel
Port Type Function
TRAN MD64 female connector Importing E1 signals

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
DPTU (for 36TRXs) Slots 3 and 4
DABB (for 36TRXs) Slots 2, 3, 4,or 7

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
DCF
CKB2
CKB1

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 full
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
sensor, door control sensor, infrared sensor,
humidity and temperature sensor.
SWIN
SWOUT
DMLC
AIN

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
the DELC and DMLC. The DELC is a mandatory
board. 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
configured to provide lightning protection for 12
routes of E1 signals.
 The DELC performs the following functions:
 Provides lighting protection for E1 signals.
 Transmits E1 signals to the DCCU, through
which the signals are sent to the DTMU for
processing.
DELC
TR

Functions of DSAC
 The DSAC is placed in slot 3 of the set-on-top
subrack. The DATU is a mandatory board. Only one
DSAC is required 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
alarm inputs of the power supply.
 Provides lightning protection for BITS clock signals.
DSAC
COM1EACSYNCCOM2S1+S1-S2+S2-

Double transceiver subsystem (BTS3012 )Ⅱ
 DTRU (Double Transceiver Unit)
 DTRB

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.

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
DBRU
DAFU

Panels on DTRU (BTS3012 )Ⅱ
 There are two types of
DTRU: type A and type
B. The four LEDs on
the DTRU panel
indicate the operating
status of the DTRU
and other functional
subsystems.
 DTRU (type A) has 10
ports and DTRU (type
B) has 8 ports. These
ports exchanges
signals with the RF
front-end subsystem.
DTRU panel (type
A)
DTRU panel (type B)

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.
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.
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
and off for 1 s)
There is a radio link alarm.

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.
RXM2 SMA female
connector
• In receive independency mode, it is the input port for the main RF signal.
RXD2 SMA female
connector
• In receive independency mode, it is the input port for the diversity RF signal.
PWR 3V3 power
connector
Power input port

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
signals 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
signals 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
main RF signal.
RXD1 SMA female
connector
diversity RF signal.
RXM2 SMA female
connector
• In receive independency mode, it is the input port for the main RF signal.
RXD2 SMA female
connector
• In receive independency mode, it is the input port for the diversity RF signal.
PWR 3V3 power
connector
Power input port

DTRU transmit modes
 Transmit independency
 Transmit diversity
 PBT
 Wideband combination

DTRU transmit mode-transmit independency
TCOM
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner

DTRU transmit mode-transmit diversity
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Man made multi way
combinercombiner

DTRU transmit mode-PBT
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Same phase
combinercombiner

DTRU transmit mode-wideband combination
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
combinercombiner

DTRU receive modes
 Receive independency
 Receive diversity
 4-way receive diversity

DTRU receive mode- Receive independency
TRX1TRX1
TRX0TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
dividerdivider
combinercombiner
dividerdivider

DTRU receive mode- Receive diversity
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
dividerdivider
dividerdivider

DTRU receive mode- 4-way receive diversity
TRX0TRX0
TX
TRX1TRX1
TX
dividerdivider
dividerdivider
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner

Intra structure of DTRU
TRX0TRX0
TX
TRX1TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combinercombiner
dividerdivider
dividerdivider

Functions of DTRB (BTS3012 )Ⅱ
 The DTRB is placed in the DTRU
subrack. The DTRB provides six slots
to house the DTRUs.
 The DTRB connects the DCSU with the
DTRU.
 The DTRB performs the following
functions:
 Provides bus connection between
the common subsystem and the
double-transceiver subsystem.
 Specifies the slot number and rack
number of the DTRU.
 Transmits the in-position signals of
the DTRUs to the DCSU.

BTS3012 Multi-Transceiver Subsystem (for 36TRXs)
 The functions of the BTS3012 multi-transceiver subsystem are
performed by the QTRU subrack. These functions are the signal
modulation and demodulation and power amplification.
 QTRU (Quadruple-Transceiver Unit)
 DTRB (Double-Transceiver Unit Backplane)

 The multi-transceiver subsystem transmits RF signals, receives RF
signals, and processes baseband signals.
 The transmitting part of the RF signals performs the following functions:
 Modulates the baseband signals into RF signals and performs up-
conversion, filtering, and radio frequency hopping.
 Amplifies RF signals.
 The receiving part of the RF signals performs the following functions:
 Performs down-conversion and radio frequency hopping.
 Receives RF signals.
 The baseband processing part performs the following functions:
 Processes the signaling, such as coding, decoding, interleaving, de-
interleaving, modulation, and demodulation.
 Supports voice and fax services.
 Supports Phase II data services, GPRS services, and EDGE services.
Functions of the BTS3012 Multi-Transceiver Subsystem (for 36
TRXs)

Functions of QTRU (for 36TRXs)
 The QTRU is placed in the multi-transceiver subsystem of the BTS. One
QTRU provides one to six TRXs.
 The QTRU functionally consists of the baseband processing part, RF
transmitting part, and RF receiving part.
 Baseband Processing Part
− Processes signaling, coding and decoding, interleaving and de-
interleaving, modulation and demodulation.
− Supports RF loop test.
 RF Transmitting Part
− Modulates the baseband signals into RF signals and performs up-
conversion, filtering, DA conversion, and RF hopping.
− Amplifies downlink signals.
 RF Receiving Part
− Amplifies uplink signals.
− Modulates the RF signals into baseband signals and performs
down-conversion, filtering, AGC controlling, and DA conversion.

Working Environment of the QTRU
 The working environment of the QTRU is as follows:
 Receives clock signals, control signals, and data signals from the
DTRB.
 Modulates the baseband signals into RF signals, and then transmits
the RF signals to the DAFU subrack through RF signal cables.
 Receives RF signals from the DAFU subrack, and then demodulates
the RF signals into baseband signals.

LEDs on the QTRU panel
LED Color Description Status Description
RUN Green Operating
and power-
on indicator
of the QTRU
On There is power supply. However, the module is
faulty.
Slow flash (on for
2s and off for 2s)
The module is starting.
Slow flash (on for
1 second and off
for 1 second)
Fast flash (on for
0.2s and off for
0.2s)
The DTMU is issuing configuration data to the
QTRU.
ACT Green Operating
indicator of
the
transceiver
On The QTRU is operating. (The DTMU issuing
configuration data normally and the cells starts) All
the channels on the TRXs operate normally.
Off The communication between the QTRU and the
DTMU is not established.
Slow flash (on for
1 second and off
for 1 second)
A part of logical channels work normally (before and
after TRX mutual aid).
ALM Red Indicates
whether
there are
alarms
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 second and off
for 1 second)
There is a radio link alarm.

Ports on the QTRU panel
TX N female connector It is the output port for the signals.
RXM SMA female connector Input port for the main RF signal
RXD SMA female connector Input port for the diversity RF signal
PWR 3V3 power connector Power input port

RF Transmit Mode/Receive Mode
 The QTRU supports one TX signal and two RX signals at the same time, as
shown in the above figure.
 The signals from multiple TRXs are transmitted from one RF output port.
 Two receive signals serve as the main and diversity of each TRX.

Functions of DTRB (for 36TRXs)
 The DTRB performs the following
functions:
Provides bus connection between
the common subsystem and the
transceiver subsystem.
Specifies the slot number and rack
number of the QTRUs.
Transmits the in-position signals of
the QTRUs to the DCSU.
 The DTRB is placed in the QTRU subrack. The DTRB provides six slots to
house the QTRUs.
 DTRB board provides connection between the DCSU with the QTRUs. All
the in-position signals of the QTRUs are transmitted to the DCSU through
the DTRB.

RF Front-End Subsystem (BTS3012 )Ⅱ
 The functions of the BTS3012 RF front-end subsystem areⅡ
performed 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)

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
the antenna.
 Receives signals from the antenna, amplifies and quarters these
signals, and then transmits them to the receiver of the DTRU.

Functional structure of the DDPU

LEDs on the DDPU panel
RUN
ALM
VSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
RUN Green Operating
and power-
on indicator
of the DDPU
On There is power supply. However, the module is faulty.
Slow flash
(on for 1s
and off for
1s)
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.

Ports on the DDPU panel
RUN
ALM
VSWRA
RXA1
RXA2
RXA3
RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
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
port 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 connector
It 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
It 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.

Functions of DCOM (BTS3012 )Ⅱ
 The DCOM is placed in the DAFU subrack. It
can be inserted in the DAFU subrack with the
DDPU.
 The DCOM is optional and up to three
DCOMs can be configured. The precondition
for configuring the DCOM is that the wideband
combination function in the DTRU must be
used when there is an additional requirements
for the combination of signals.
 The DCOM combines two routes of TX signals
from the DTRU, and then sends them to the
DDPU.
DCOM
TX-COM
TX2
TX1
ONSHELL

Ports on the DCOM panel
ONSHELL DB26 female connector
It exports the in-position signals of the
DCOM to the DCTB of the BTS3012.
TX-COM N female connector
It is the output port for the signals combined
from the TX1 and TX2 ports of the DCOM.
TX1 N female connector
It is the input port for the combined signals
from the DTRU to the DCOM.
TX2 N female connector

Functions of DFCU (BTS3012 )Ⅱ
 The DFCU is located in the DAFU subrack of the RF front-end
subsystem. The DFCU is optional. The BTS3012 can be configured withⅡ
the DDPU or the DFCU.
 The DFCU performs the following functions:
 Transmits multiple routes of RF TX signals from the DTRU transmitter
to the antenna through the duplexer after combination.
 Transmits the received signals from the antenna to the duplexer and to
the low noise amplifier (The DFCU also controls the gain of the
amplifier), divides the signals into several routes, and transmits them
to the receivers of the DTRUs.
 Provides four-in-one signal combination or six-in-one signal
combination once connected with the DFCB.
 Detects the frequencies of the input signals and performs automatic
tuning.
 Detects the VSWR alarms of the antenna system and provides the
function of the VSWR alarms whose thresholds are adjustable.

Functional structure of the DFCU

LEDs on the DFCU panel
RUN Green Power
indicator
On There is power input.
Off There is no power input.
VSWR Red VSWR alarm
indicator of
the
TX/RX_ANT
port
On There is a level 2 VSWR
alarm.
Slow flash
(on for 1 s
and off for
1 s)
There is a level 1 VSWR
alarm.
Off There is no VSWR alarm.
LNA Red LNA alarm
indicator
On There is an LNA alarm.
Off There is no alarm.
TUNING Red Tuning fail
alarm
indicator
On There is a tuning failure alarm.
Slow flash
(on for 1 s
and off for
1 s)
Tuning

Ports on the DFCU panel
TX/RX-ANT 7/16 DIN female connector
Antenna port for reception and transmission
• It is the output port for the RF signals transmitted from the TX-DUP
port.
RXD-ANT 7/16 DIN female connector Diversity receive antenna port
DBUS DB26 female connector Input/output port for DBUS signals
DC-IN –48 V 3V3 power connector DC power input port
TX-COM N female connector Combination output port for the signals transmitted from the TX1, TX2,
TX3, TX4, and COM-IN ports; It is connected to the TX-DUP port.
TX-DUP N female connector Input port for the RF signals from the duplexer; It is connected to the TX-
COM port.
COM-IN N female connector Extended combination port; It is connected to the output port of the RF
signals from the DFCB.
TX1
N female connector Input port for the RF signals; It is connected to the TX1 or TX2 port on the
DTRU panel.
TX2
TX3
TX4
RX1
It is the output port for the RF signals received from the TX/RX-ANT port.
It is connected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU
panel.
RX2
RX3
RX4
It is the output port for the RF signal received from the HL-IN port. It is
connected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.
RX5 • If the HL-IN port connects with the RXD-OUT port, it serves as the
output port for the diversity RF signals received by the RXD-ANT.
RX6 • If the HL-IN port connects with the HL-OUT port, it serves as the output
port for the RF signals received by the TX/RX-ANT port.

Ports on the DFCU panel
HL-OUT SMA female connector Output port for high-level signals; It can be connected to the
HL-IN port.
HL-IN SMA female connector Input port for the high level signals; It is connected to the HL-
OUT or RXD-OUT port.
RXD-ANT SMA female connector Output port for the diversity received signals; When the RXD-
ANT is used, the RXD-OUT is connected to the HL-IN port.
PR out1 SMA female connector Reverse power sampling output port 1; It is connected to the
PR in1 port.
PR out2 SMA female connector Reverse power sampling output port 2; It is connected to the
PR in1 or PR in2 port on the DFCB panel.
PF out1 SMA female connector Forward power sampling output port 1; It is connected to the
PF in1 port.
PF out2 SMA female connector Forward power sampling output port 2; It is connected to the
PF in1 or PF in2 port on the DFCB panel.
PR in1 SMA female connector Reverse power sampling input port 1
PF in1 SMA female connector Forward power sampling input port 1

Functions of DFCB (BTS3012 )Ⅱ
 The DFCB is located in the DAFU subrack of the RF front-end subsystem. It is
an optional module. The BTS3012 can be configured with the DDPU or theⅡ
DFCU/DFCB.
 The DFCB receives the UL signals from the antenna, divides the signals, and
then sends the signals to the DTRU. It also receives DL signals from the DTRU,
filters and amplifies the signals, and then sends the signals to the antenna. The
DFCB must be connected with the DFCU.
 The DFCB performs the following functions:
 Combines one route or two routes of RF TX signals from the transmitter of
the DTRU , and then transmits them to the antenna through a duplexer.
 Transmits the received signals from the antenna to the duplexer and LNA
(The DFCU also controls the gain of the amplifier), divides the signals into
several routes, and then transmits them to the receivers of the DTRUs.
 Detects the VSWR alarms of the antenna system and provides the function
of the VSWR alarms whose thresholds are adjustable.

Functional structure of the DFCB

LEDs on the DFCB panel
RUN Green Power indicator On There is power input.
Off There is no power input.
VSWR Red VSWR alarm
indicator of the
TX/RX_ANT
port
On There is a level 2 VSWR alarm.
Slow flash
(on for 1 s
and off for 1
s)
There is a level 1 VSWR alarm.
Off There is no VSWR alarm.
LNA Red LNA alarm
indicator
On There is an LNA alarm.
TUNING Red Tuning fail
alarm indicator
On There is a tuning failure alarm.
Slow flash
(on for 1 s
and off for 1
s)
Tuning

Ports on the DFCB panel
Port Type Function
TX/RX-ANT 7/16 DIN female connector Antenna port for reception and transmission
• It is the output port for the RF signals transmitted from the TX-DUP port.
RXD-ANT 7/16 DIN female connector Diversity receive antenna port
DBUS DB26 female connector Input/output port for DBUS signals
DC-IN –48 V 3V3 power connector DC power input port
COM1 N female connector It is the output port for the signals combined from the TX1 and TX2 ports.
TX-DUP N female connector Input port for the RF signals from the duplexer; It is connected to the COM1 or
COM2 port.
COM2 N female connector It is the output port for the signals combined from the TX3 and TX4 ports.
TX1 N female connector Input port for the RF signals; It is connected to the TX1 or TX2 port on the
DTRU panel.
TX2
TX3
TX4
RX1 SMA female connector It is the output port for the RF signals received from the TX/RX-ANT port. It is
RX2
RX3
RX4 SMA female connector It is the output port for the RF signal received from the HL-IN port. It is
RX5 • If the HL-IN port connects with the RXD-OUT port, it serves as the output
port for the diversity RF signals received by the RXD-ANT.
RX6 • If the HL-IN port connects with the HL-OUT port, it serves as the output
port for the RF signals received by the TX/RX-ANT port.

Ports on the DFCB panel
Port Type Function
HL-OUT SMA female connector Output port for high-level signals; It can be connected to the HL-IN port.
HL-IN SMA female connector Input port for the high level signals; It is connected to the HL-OUT or
RXD-OUT port.
RXD-ANT SMA female connector Output port for the diversity received signals; When the RXD-ANT is
used, the RXD-OUT is connected to the HL-IN port.
PR out1 SMA female connector Reverse power sampling output port 1
PR out2 SMA female connector Reverse power sampling output port 2
PF out1 SMA female connector Forward power sampling output port 1
PF out2 SMA female connector Forward power sampling output port 2

BTS3012 RF Front-End Subsystem (for
36TRXs)
 The functions of the BTS3012 RF front-end subsystem are performed by
the modules in the DAFU subrack. These functions are transmit/receive
duplex, low-noise amplification of receive signals, and related control
functions.
 The functions of the RF front-end subsystem are performed by the
DDPUs in the DAFU subrack.
 DDPU (Dual-Duplexer Unit for DTRU BTS)

 The BTS3012 RF front-end subsystem duplexes the received signals and
the signals transmitted from the TRX, combines the signals for
transmission, divides the received signals, and amplifies the received
signals with the LNA.
 The RF front-end subsystem performs the following functions:
 Combines multiple routes of RF TX signals for transmission
 Transmits and receives signals through a duplexer
 Detects and reports antenna Voltage Standing Wave Ratio (VSWR)
alarms and low noise amplification alarms
 Controls the low noise amplification gain
 Detects and reports the transmit power on the antenna ports
 Detects and reports the temperature of the boards
 Detects whether a board is in position
 Supports online software upgrade
Functions of the BTS3012 RF Front-End Subsystem (for
36TRXs)

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
subrack.
 The fan box performs the following functions:
 Monitors the temperature at the air inlet of the cabinet and the
temperature in the fan subrack, and then adjusts the speed of the
fans.
 Communicates with the DTMU to adjust the speed of the fans and
report alarms.
FANSTATE
COM
PWR

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.

Signal Flow of the BTS3012 Ⅱ
 The BTS3012 signal flow is associated with the traffic andⅡ
signaling 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

DL Traffic Signal Flow of the BTS3012 Ⅱ

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
sends the E1 signals to the DCTB.
 The DCTB sends the E1 signals to the DCCU through the TOP signal cable
connecting 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.
The 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
filtering, 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.

UL Traffic Signal Flow of the BTS3012 Ⅱ

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
feeder. The TMA is optional. It is used to compensate the feeder loss and
enhance receive sensitivity of the DDPU/DFCU/DFCB antenna port.
 The DDPU/DFCU/DFCB receives the UL signals and transmits the signals
to the DTRUs in the two DTRU subracks after they are filtered by the
duplexer and amplified by the lower noise amplifier (LNA).
 The DTRU in DTRU subrack 1 receives the signals from the
DDPU/DFCU/DFCB and transmits the signals to the DTRB after
amplification and down-conversion.
 The DTRB sends the signals to the DCSU.

UL Traffic Signal Flow
 The DCSU sends the signals to the DTMU through the ECMB. In
addition, the DTRU in DTRU subrack 0 receives the signals from the
DDPU/DFCU/DFCB, and transmits the signals to the DTMU through the
ECMB after amplification and down conversion.
 The DTMU backs up the E1 signals and converts the E1 signals
through 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
the signals to the BSC through the E1 cables.

Signaling Flow of the BTS3012 Ⅱ

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
analyzing the states of all the boards. Then, it transmits the
information to the BSC through the Abis interface.

Signal Flow of BTS3012 Cabinet GroupsⅡ
 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 asⅡ
follows:

Clock Signals
DTMU
Boards in main
cabinet
Boards in slave
cabinet
A-bis
Clock distribution
cable between
cabinets

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
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

Control Signals
 The control signals refer to the CBUS1 signals, which are
responsible for the communication between the DTMUs in the
main and extension cabinet groups.

Control Signals Description
 The processing of CBUS1 signals is as follows:
 The DTMU in the cabinet of the main cabinet group transmits
the CBUS1 signals to the cabinets in the extension cabinet
groups, through signal conversion of relevant boards.
 The cabinets in the extension cabinet groups transmit the
CBUS1 signals to the DTMUs in those cabinets, through signal
conversion of relevant boards.

Signal Flow of the BTS3012 (for 36TRXs)
 The BTS3012 (for 36TRXs) signal flow consists of the traffic flow and
signaling flow of the BTS.
 The BTS3012 (for 36TRXs) signal flow consists of :
 DL traffic signal flow
 UL traffic signal flow
 Signaling flow
 Signal flow of combined cabinets and cabinet groups

DL Traffic Signal Flow of the BTS3012 (for 36TRXs)

DL traffic signal flow (for 36TRXs)
 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 E1 signals, and then sends the
E1 signals to the DCTB.
 The DCTB sends the signals to the DPTU.
 The DPTU sends the signals to the DTMU through the DCMB.
 The DTMU receives the signals from the DPTU and then converts those signals
through the data bus (DBUS) on the DCMB. The DTMU also assigns the data
based on the data configuration on the OML. The signals are then sent to the
DCSU through the DCMB.
 The DCSU sends the signals to the DTRB.
 The DTRB sends the signals to the QTRU.
 After receiving the signals, the QTRU performs digital filtering, up-conversion,
filtering and amplification, and then sends the signals to the DDPU.
 The duplexer in the DDPU filters the signals from the QTRU, and then sends the
signals to the antenna subsystem for transmission.

UL Traffic Signal Flow of the BTS3012 (for 36TRXs)

 The UL traffic signal flow is as follows:
 The antenna receives the signals from the MS. After being amplified by
the TMA, the received signals are transmitted to the DDPU through the
feeder.
− NOTE: The TMA compensates the feeder loss and enhances the
receiver sensitivity at the antenna port of the DDPU. The TMA is
optional.
 The DDPU receives the UL signals, performs signal filtering and low-noise
amplification, and then transmits the signals to the QTRU.
 The QTRU receives the signals from the DDPU, demodulates and
amplifies the signals, performs down-conversion, and then transmits the
signals to the DTRB.
UL traffic signal flow (for 36TRXs)

 The DTRB sends the signals to the DCSU through the signal cable
between the DTRB and the DCSU.
 The DCSU sends the signals to the DTMU through the DCMB.
 The DTMU backs up the E1 signals and converts the E1 signals through
the DBUS on the DCMB. The DTMU then sends the converted signals to
the DPTU through the DCMB.
 The DPTU sends the signals to the DCTB.
 The DCTB sends the signals to the DELC.
 The DELC provides lightning protection for the signals. Then, it sends the
signals to the BSC through the E1 cables.
UL traffic signal flow (for 36TRXs)

Signaling Flow of the BTS3012 (for 36TRXs)

Signaling Flow (for 36TRXs)
 The signaling flow is as follows:
 The BSC sends the signaling data to the DTMU in the BTS.
 After processing the signaling, the DTMU sends the signaling to the
QTRU and DDPU.
 The QTRU and DDPU report their board status to the DTMU.
 The DTMU obtains the status of the BTS3012 by collecting and
analyzing the states of all the boards. Then, it transmits the
information to the BSC over the Abis interface.

Signal Flow of BTS3012 Combined Cabinets and Cabinet Groups (for
36TRXs)
 The signal flow of the BTS3012 cabinet groups refers to the signal flow
between the main cabinet group and the extension cabinet groups. The
signal flow of combined cabinets refers to the signal flow between the
main cabinet and the extension cabinet in one cabinet group. The signal
flows of the combined cabinets and cabinet groups involve clock signals,
data signals, and control signals. The three types of signal flow are
transferred over the signal cables for the combined cabinets and cabinet
groups.
 The signal flow associated with combined cabinets and cabinet groups
is as follows:
 The signals between the main cabinet and the extension cabinet
consist of the data signals, control signals, and clock signals.
 The signals between the main cabinets belonging to different cabinet
groups consist of the clock signals and control signals.

Signal Flow of BTS3012 Combined Cabinets and Cabinet Groups (for
36TRXs)
 The figure below shows the bus connection between BTS3012
combined cabinets and cabinet groups.

Configuration Principles for the BTS3012 Ⅱ
 Configure the BTS3012 according to the following principles:
 Use a minimum number of antennas.
 Use a minimum number of cabinets.
 Configure all the TRXs that belong to one synchronized cell in one
cabinet group.
 Adhere to the following principles when configuring the BTS3012 cabinets:
 If less than 18 TRXs are required in the synchronized cells of a site, use
one cabinet to configure the site.
 If more than 18 TRXs are required in the synchronized cells of a site, use
cabinet groups to configure the site.

Configuration Features for the BTS3012 Ⅱ
 The BTS3012 has the following features in terms of configuration:
 Supports omnidirectional cell coverage and directional cell coverage
 Supports the grouping of three cabinets
 The RF TX mode supports wideband combining, PBT, transmit diversity,
and non-combining. The DTRU connected to the DFCU does not support
the wideband combining mechanism.
 The RF RX mode supports the receive diversity, independent receive,
and four-way receive diversity.

Typical Configuration of One BTS3012 Cabinet S2/2/2Ⅱ
 The right figure shows
the cabling of RF cables
in an S2/2/2 cell. The RF
TX cable is blue, the RF
RX cable is red, and the
combining short-
circuiting signal cable is
black.

in an S6/6/6 cell.
Typical Configuration of One BTS3012 CabinetⅡ
S6/6/6

Typical Configuration of BTS3012 Cabinet GroupsⅡ
 Configuration of the DTMU
 All the cabinets should be configured with the DTMUs when the
cabinet groups are used.
 Configuration of the DTRU/DDPU/DCOM/DFCU/DFCB
 In an S4 or a smaller site, use the DDPU.
 In S5-S8 sites, use the DDPU+DCOM combination mode or the
DFCU.
 In S9-S18 sites, use the DDPU+DCOM or DFCU+DFCB
combination mode.

Configuration Principles and Features for the BTS3012 (for 36TRXs)
 Configure the BTS3012 according to the following principles:
 Use a minimum number of antennas.
 Use a minimum number of cabinets.
 Configure all the TRXs that belong to one synchronized cell in one
cabinet group.
 The BTS3012 has the following features in terms of configuration:
 One QTRU supports one to six TRXs.
 Supports omnidirectional cell coverage and directional cell coverage.
 The RF TX mode supports the transmit independency mode.
 The RF RX mode supports the receive independency mode.

in an S6/6/6 cell.
Typical Configuration of One BTS3012 Cabinet S6/6/6 (for 36TRXs)

 The right
figure shows
the cabling of
RF cables in
an S12/12/12
cell.
Typical Configuration of One BTS3012 Cabinet S12/12/12 (for
36TRXs)

Typical Configuration of BTS3012 Combined Cabinets and
Cabinet Groups (for 36TRXs)
 Configuration of the DTMU
 When the combined cabinets are used, the main cabinet should
be configured with the DTMUs, the extension cabinet should not
be configured with the DTMU.
 When the cabinet groups are used, the main cabinets of all the
cabinets should be configured with the DTMUs, the extension
cabinets of all the cabinets should not be configured with the
DTMU.

 Functions and features of BTS3012
 BTS3012 hardware structure
 System Signal Flow
 Typical configuration
SummarySummary

Ome201102 huawei bts3012 hardware structure issue2.0

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Ome201102 huawei bts3012 hardware structure issue2.0