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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
HUAWEI BTS3900 Hardware Structure
Page2Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Foreword
The BTS3900 developed by Huawei is an indoor macro BTS. The BTS3900 mainly consists of the BBU and DRFUs. Compared with traditional BTSs, the BTS3900 features simpler structure and higher integration.
In this slide, we’ll mainly introduce the hardware system structure, application scenarios, basic functions of modules, networking mode and typical configuration of the BTS3900
Page3Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
References
《 BTS3900 System Description 》 《 BTS3900 Hardware Description 》
Page4Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
Upon completion of this course, you will be able to:
Know the application scenarios of BTS3900
Grasp the hardware structure of BTS3900
Grasp the functions of the modules
Master typical configuration of BTS3900
Know the networking topology of BTS3900
Page5Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. BTS3900 Overview
2. BTS3900 Hardware Components 2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
3. Configurations of the BTS3900 3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
Page6Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900 Overview
2. BTS3900 Hardware Components
3. Configurations of the BTS3900
Page7Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Location of BTS3900
PSTN ISDN
PSPDN
Um Interface
BTS3900
BTS3900
BTS3900
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAPMAP
TUP,ISUPMS
MS
MS
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
Page8Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Some Functions and Features It adopts the unified BTS platform developed by Huawei Wireless and
enables the smooth evolution from 2G to 3G. It supports the Abis IP/FE interface in hardware and enables Abis over
IP through software upgrade if required. It shares the BBU, which is the central processing unit, with the DBS39
00 to minimize the number of spare parts and reduce the cost. It can be flexibly installed in a small footprint and easily maintained w
ith low cost. It supports transmit diversity and PBT. It supports 2-antenna and 4-antenna receive diversity to improve the
uplink coverage. It supports the GPRS and EGPRS.
Page9Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Some Functions and Features It supports the hierarchical cell, concentric cell, and micro cell. It supports multiple network topologies, such as star, tree, chain, r
ing, and hybrid topologies. It supports the A5/3, A5/2, and A5/1 encryption and decryption alg
orithms. It supports coexistence with the BTS3012. A single cabinet supports up to 12 carriers in the maximum cell co
nfiguration of S4/4/4. Multiple cabinets support up to 72 carriers in the maximum cell co
nfiguration of S24/24/24. Receiver sensitivity on TCH/FS is -113 dBm
Page10Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900 Overview
2. BTS3900 Hardware Components
3. Configuration of the BTS3900
Page11Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900 Hardware Components
2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
Page12Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Structure of the BTS3900 Cabinet
-48V Cabinet-48V Cabinet
(1) Double radio filter unit(2) Fan box(3) GSM antenna and TMA control module(4) Baseband unit(5) Direct current distribution unit
Page13Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Structure of the BTS3900 Cabinet
+24V or +220V Cabinet +24V or +220V Cabinet
(1) Double radio filter unit(2) Fan box(3) Baseband unit(4) Direct current distribution unit(5) Cable in/out unit (6) Power supply unit
Page14Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Board/ module
Full Name Quantity
FullConfiguration
MinimumConfiguration
BSBC Universal BBU Subrack Backplane type C (2U) 1 1
UEIU Universal Environment Interface Unit 1 0
GTMU GSM Transmission and Management Unit for BBU 1 1
UELP Universal E1/T1 Lightning Protection Unit 1 0
UBFA Universal BBU Fan unit type A (2U) 1 1
UPEU Universal Power and Environment interface Unit 2 1
DRFU Double Radio Filter Unit 6 1
DCDU Direct Current Distribution Unit 1 1
GATM GSM Antenna and TMA Control Module 1 0
DPMU Power and Environment Monitoring Unit 1 0
PSU(AC/DC) Power Supply Unit (AC/DC) 3 0
PSU(DC/DC) Power Supply Unit (DC/DC) 4 0
Fan box Fan box 1 1
Abbreviations
Page15Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Logical Structure and Signal Flow
Page16Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Stack Mode
When two BTS3900 cabinets (-48
V) are stacked, the BBU is
installed only in the lower cabinet
and serves as the baseband
control unit for the two cabinets.
Page17Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Stack Mode
When the BTS3900 cabinet (-48 V) is stacked on the BTS3900 cabinet (220 V or +24V), a maximum of nine DRFUs can be configured.
When two cabinets are stacked, the BBU is installed only in the lower cabinet and serves as the baseband control unit for the two cabinets.
Page18Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900 Hardware Components
2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
Page19Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
BBU The typical power consumption of BBU is 35W
The weight of the BBU is 12 kg at most.
All the boards can be inserted from the front panel
The Permissible range of power input is –38.4 V DC to –57 V DC
Page20Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Working Principles of the BBU
Page21Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Boards and Modules in BBU
BSBC: The universal BBU subrack backplane type C GTMU: The GSM Transmission, Timing and Management Unit UBFA: The universal BBU fan unit type A UPEU: The universal power and environment interface unit UELP: The universal E1/T1 lightning protection unit UEIU: The universal environment interface unit
Page22Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
BSBC Board The BSBA provides slot 6 for the GTMU, slot 7 for a main control
board that supports 3G, and slots 0 to 5 as common slots. The GTMU is 1 U high. Therefore, from the view of the front panel, the GTMU is located in slots 5 and 6.
Provide backplane interfaces, communication channels, distribute clock signal and +12V power supply for the other boards
Page23Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
GTMU Controls, maintains, and operates the BTS
Supports fault management, configuration management, performance management, and security management
Monitors the fan module and the power supply module
Distributes and manages BTS clock signals
Provides clock input for testing
Provides the Ethernet port for terminal maintenance
Supports four E1 inputs
Provides the CPRI ports for communication with the DRFU
Page24Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
GTMU Ports
Port Type Corresponding cable Description
CPRI0 ~CPRI5
DLC Optical fiber between BBU and DRFU
Connected to DRFU for the optical signal transmission
ETH RJ45 Special Ethernet cable Terminal maintenance and commissioning
FE0 RJ45 Ethernet cable A reserved port that performs the
following function: Connects the BBU to
a routing device in the equipment room
through the Ethernet cable for
transmission
FE1 DLC Optical fiber
USB USB - A reserved port that performs the
following function: Automatically
upgrades the software through the USB
disk
TEST USB - Tests the output clock signals with a tester
E1/T1 DB26 male
BBU E1/T1 Provides the input and output of the four E1/T1 signals between the GTMU and the UELP or between the GTMU and the BSC
Page25Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
GTMU Indicators
Indicator
Color Status Description
RUN Green On Board has fault
Green Off Not power input or the board is faulty
Green Slow flash(1s on, 1s off) The board is operational.
Green Slow flash (2s on, 2s off) OML is abnormal
Green Fast flash (0.125s on, 0.125s off)
Board is loading software
ALM Red On A fault occurs in the running board.
Off No fault
ACT Green On The board is operational.
Off Board has fault
LIU0~LIU3
Green On E1/T1 local alarm
Fast flash (0.125s on, 0.125s off)
E1/T1 remote alarm
Off Not used or alarm has disappeared
CPRI0~CPRI5
Green On CPRI link is functional
Red On CPRI link is abnormal
Page26Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
GTMU Toggle Switch
Toggle switch
StatusDescription1 2
SW1 ON ON The E1 impedance is set to 75 Ω.
OFF ON The E1 impedance is set to 120 Ω.
ON OFF The T1 impedance is set to 100 Ω.
Toggle switch
Status
Description1 2 3 4
SW2 ON ON ON ON The E1 cable is grounded.
OFF OFF OFF OFF The E1 cable is not grounded.
Page27Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
GTMU toggle switch
Toggle switch
Status Description
1 2 3 4
SW4 ON ON ON ON The E1 link can be bypassed.
OFF OFF OFF OFF The E1 link cannot be bypassed.
Toggle
switch
Status Description
1 2 3 4
SW5 ON ON ON ON The E1 link cannot be bypassed.
OFF ON ON OFF The E1 link of the Level 1 cascaded BTS can be bypassed.
ON OFF ON OFF The E1 link of the Level 2 cascaded BTS can be bypassed.
OFF OFF ON OFF The E1 link of the Level 3 cascaded BTS can be bypassed.
ON ON OFF OFF The E1 link of the Level 4 cascaded BTS can be bypassed.
OFF ON OFF OFF The E1 link of the Level 5 cascaded BTS can be bypassed.
Page28Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UBFA The universal BBU fan unit type A (2U) (UBFA) works with the air inlet box
of the cabinet to form a ventilation circuit, thus cooling the entire cabinet.
The UBFA module communicates with the GTMU to regulate the
temperature, adjust the fan speed, and report alarms. The UBFA module is
hot swappable. Indica
torColor Status Description
STATE Green Fast flash(0.25s on , 0.25s off)
Can not communicate with the board and there is no alarm generated
Red On There is alarm
Green Slow flash(1s on, 1s off)
Runs normally
Page29Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UPEU The universal power and environment interface unit type A (–48
V) (UPEU) supports the –48 V DC power input, supplies power to
the boards, modules, and fan in the BBU, and provides access to
multiple environment monitoring signals. Port Type Description
MON0
RJ45 Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol
MON1
RJ45 Reserved
EXT-ALM0
RJ45 Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry contact
EXT-ALM1
RJ45 Reserved
PWR 3V3 -48V DC input
Page30Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UEIU UEIU is the environment interface board of BBU , it can support
multi-route monitoring signal input UEIU is optional and is only used when more ports are needed
Port Type Description
MON0
RJ45 Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol
MON1
RJ45 Reserved
EXT-ALM0
RJ45 Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry contact
EXT-ALM1
RJ45 Reserved
Page31Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UELP UELP is the E1/T1 signal lightening protection unit of BBU
and it can provide protection for 4 route E1/T1 signal
Port Type Relative cables
Description
INSIDE DB25 male
E1 transferring cable
Transfers the four E1/T1 signals between the UELP and the GTMU
OUTSIDE DB26 male
E1/T1 cable Provides the input and output of the four E1/T1 signals between the BBU and the BSC
Page32Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900 Hardware Components
2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
Page33Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
DCDU Panel
a: Power switch b: Power output ports
Page34Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of DCDU The functions of the DCDU are:
Receiving -48 V DC power input
Distributing the -48 V DC power of 10 outputs for boards and modules in the cabinet
Providing surge protection of 10 kA in differential mode and 15 kA in common mode and providing dry contact for surge protection failure
Page35Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Ports and Switches of DCDU
Name Label Description
Power input terminal NEG(-) DCDU low level input terminal
RTN(+) DCDU high level input terminal
Power output port SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power ports supplying the 10 outputs of power to the BBU, DRFU, GATM, and fan box
Power switch SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power switch controlling the 10 outputs for the BBU, DRFU, GATM, and fan box
Alarm output port SPD ALM Dry contact alarm output port
Page36Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
DPMU and PSU The wiring unit is connected to the external power supply through
the terminals for L and N wires, and leads the power to the PSU
through the backplane.
The PSU converts the input power into the -48 V DC power.
The DPMU monitors the operating status of the PSU.
The wiring unit provides -48 V DC power outputs through LOAD1(-),
LOAD2(-), and RTN(+).
1) DPMU2) PSU 3) Wiring unit
Page37Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of PSU There are 2 kinds of Power Supply Unit (PSU), AC/DC and DC/DC. AC/
DC PSU converts 220V to -48V; DC/DC PSU converts +24V to -48V The AC/DC and DC/DC PSU monitor alarms related to module faults
(such as output overvoltage, no output, and fan faults), alarms related to module protection (such as overtemperature protection, and input overvoltage/undervoltage protection), and power failure alarm
Page38Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of PSU
input LED (top) Green On Normal.
Off There is no AC power input or the fuse is damaged.
Power protection LED (middle)
Yellow Off Normal.
On Power protection for the PSU is being triggered, for example, upon input undervoltage/overvoltage or overtemperature.
Power failure LED (bottom)
Red Off Normal.
On Irrecoverable fault occurs inside the PSU. For example, the fault can be output overvoltage, no outputs, or fan fault.
Page39Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of PMU The power and environment monitoring unit (DPMU)
Communicates with the central processing unit through the
RS232/RS422 serial port
Manages the power system and the battery charging and
discharging
Detects and reports water damage alarms, smoke alarms, door
status alarms, and standby Boolean value alarms; reports ambient
humidity and temperature, battery temperature, and standby
analog values
Detects power distribution and reports alarms, and also reports dry
contact alarms
Page40Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Ports of PMU
1. LEDs2. Power supply test ports 3. RS232/RS422 ports 4. Battery control switch 5. COM port
Ports Function
RS232/RS422 port Used in communication with the central processing unit
Battery switch The battery switch has two control ports ON and OFF, which are used for switching on and switching off the battery.•Press and hold the port ON for 5-10 seconds to switch on the battery. •Press and hold the port OFF for 5-10 seconds to switch off the battery.
Power supply test port
Two power supply test holes -48V and 0V are available for measurement through an ordinary multimeter.
COM port Used in connection to the external signal transfer board
Backplane port Used in connection to the backplane
Page41Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Distribution Mode 1 The BTS3900 cabinet can use three types of power inputs, namely, -
48 V DC, +24 V DC, and 220 V AC.
If the external -48 V DC power input is used, no additional power
system is required. The external -48 V DC power input is directly
connected to the power input terminals on the DCDU (10 outputs).
Then, the DCDU distributes the -48 V DC power to each module in
the cabinet.
Page42Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Distribution Mode 2 When the external +24 V DC power or +220V AC power is used, PSUs an
d a cable in/out unit are configured in the cabinet. The PSUs convert the external power into the -48 V DC power and supply the -48 V DC power to the DCDU Then, the DCDU distributes the -48 V DC power to each module in the cabinet.
Page43Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Distribution Mode 3 This is the power distribution when a -48 V DC cabinet is stacked on a
+24 V DC cabinet or +220V AC cabinet. The PSUs convert the external +24 V DC or +220VAC power into the -48 V DC power and supply -48 V DC power to the DCDUs in both cabinets. Then, the DCDUs distribute the -48 V DC power to the modules in both cabinets.
Page44Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900 Hardware Components
2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
Page45Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of GATM The GSM antenna and TMA control module (GATM) is a module
that controls the antenna and TMA. The GATM is optional.
Controls the RET antenna
Feeds power to the TMA
Reports the RET control alarm signals
Monitors the current from the feeder
Page46Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Ports on the GATM Ports Connector Function
ANT0 SMA female Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT1 SMA female Providing power for the antenna
ANT2 SMA female Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT3 SMA female Providing power for the antenna
ANT4 SMA female Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT5 SMA female Providing power for the antenna
COM1 RJ45 Used in connection to the BBU
COM2 RJ45 Providing the extended RS485 port to be cascaded with other devices
-48 V 7W2 Receiving the -48 V power input
Page47Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
LEDs on the GATM LED Color Description Status Meaning
RUN Green Indicator of the board running status
Blinking once every four seconds
There is power supply but the communication with the BBU is abnormal.
Blinking once every two seconds
The board is running normally and the communication with the BBU is normal.
Off There is no power supply or the module is faulty.
ACT Green Indicator of the service running status
On The AISG link is normal.
Off The AISG link is abnormal.
Blinking frequently and irregularly
The AISG link is transmitting data.
ALM Red Alarm indicator
On An alarm is generated, such as an overcurrent alarm.
Off The module runs normally.
Page48Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Features and Functions of Fan Box Provides forced ventilation and dissipation for the cabinet
Supports two modes of adjusting the rotation speed of the fans: adjustment based on the temperature and adjustment controlled by BBU
Detects the temperature
Communicates with BBU unit to report alarms and the adjusted rotation speed of the fans to BBU
Stops the rotation of the fans when the ambient temperature is low
A fan box is configured with one NFCB and four fans. The fans are configured in N+1 mode. When one fan fails, the other fans rotate at full speed.
Page49Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connectors and LEDs of Fan Box
Type Silk-Screen Connector Description
Power port -48 V 7W2 Used to introduce the -48 V DC power
Temperature sensor port
SENSOR RJ45 Used in connection to the external temperature sensor
Communication port
COM OUT RJ45 Used in connection to the lower-level cascaded fan box
COM IN RJ45 Used in communication with the central processing unit
LED Color Status Description
RUN Green Blinking four times per second
The communication with the central processing unit is not established but the module runs normally.
Blinking once every two seconds
The communication with the central processing unit is established and the module runs normally.
Off There is no power input and the module is faulty.
ALM Red Blinking once every two seconds
An alarm is generated.
Off No alarm is generated.
Page50Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of DRFU One double radio filter unit (DRFU) provides two TRXs
The DRFU performs modulation and demodulation between
baseband signals and RF signals, processes data, and combines
and divides signals.
Page51Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Working Principles of the DRFU
The DRFU consists of the high-speed interface unit,
signal processing unit, power amplifier, and dual-
duplexer.
Page52Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Internal Structure 2 TRXs and 2 duplexers are integrated in DRFU module which can be connect
ed to antenna directly The RX_IN/OUT port of DRFU can support the receiving signal interconnecti
on between 2 DRFUs, so that it can support the diversity receiving between 2DRFUs
Interface Processing U
nit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
Page53Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Ports of the DRFU Type Connector Ports Description
Port for transmitting and receiving RF signals
N female connector
ANT1 Used in connection to the antenna subsystem
ANT2
CPRI port SFP female connector
CPRI0 Used in connection to the BBU, or in connection to the upper-level cascaded DRFU
CPRI1 Used in connection to the lower-level cascaded DRFU
Port for transmitting RF signals between DRFUs
QMA female connector
RX1 in Input port for diversity signals in antenna channel 1
RX1 out Output port of diversity signals in antenna channel 1
RX2 in Input port for diversity signals in antenna channel 2
RX2 out Output port of diversity signals in antenna channel 2
Power port 7W2 power connector
PWR Receives power input
Page54Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of the DRFU LED Status Meaning
RUN On The power input is normal, but the BBU is faulty.
Off There is no power supply or the module is faulty.
Blinking once every two seconds
The module is functional.
Blinking four times per second
The module is loading software or is not started.
ALM On A fault alarm is generated.
Off No alarm is generated.
ACT On The module is functional and is correctly connected to the BBU.
Off The connection with the BBU is not established.
Blinking once every two seconds
The DRFU is being tested on the Site Maintenance Terminal.
Page55Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of the DRFU VSWR Off (red) No VSWR alarm is detected.
Blinking once every two seconds (red)
The VSWR alarm is generated on only the ANT2 port.
Blinking four times per second (red)
The VSWR alarms are generated on the ANT1 and ANT2 ports.
On (red) The VSWR alarm is generated on only the ANT1 port.
CPRI0 On (green) The CPRI link is functional.
On (red) The interface module fails to receive signals.
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
CPRI1 On (green) The CPRI link is functional.
On (red) The interface module fails to receive signals.
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
Page56Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900 Hardware Components
2.1 BTS3900 basic structure
2.2 BBU hardware structure
2.3 Power supply system of BTS3900
2.4 Other boards and modules
2.5 Cables connection of the cabinet
Page57Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Cable Connection of -48V Cabinet
Cable Number
Cable Name Quantity
R1-R12 RF Jumpers 12
P1-P2 External Power Cables (-48 V) 2
P3-P8 Power Cables Between the DCDU and DRFUs 6
P9 Power Cable Between the DCDU and Fan Box 1
P10 Power Cable Between the DCDU and BBU 1
P11-P12 Reserved 2
S1-S6 CPRI Signal Cables Between the BBU and DRFU
6
S7 E1 Transfer Cable of the BBU 1
S8 Monitoring Signal Cables for the DCDU 1
S9 Monitoring Signal Cable for the Fan Box 1
S10 E1/T1 Cable of the BBU 1
Page58Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Cable Connection of +24V Cabinet
Cable Name
R1-R12 RF Jumpers 12
P1–P2 Power Cables Between the PSU (DC/DC) and DCDU
2
P3-P8 Power Cables Between the DCDU and DRFUs 6
P9 Power Cable Between the DCDU and Fan Box 1
P10 Power Cable Between the DCDU and the BBU 1
P11-P12 Reserved 2
P13-P14 External Power Cables (+24 V) 4
S1-S6 CPRI Signal Cables Between the BBU and DRFU
6
S7 E1 Transfer Cable of the BBU 1
S8 Monitoring Signal Cables for the DCDU 1
S9 In-Position Signal Cable for the PSU (DC/DC) 1
S10 Monitoring Signal Cable for the Fan Box 1
S11 E1/T1 Cable of the BBU 1
Cable number
Quantity
Page59Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Cable Connection of +220V CabinetCable
NumberCable Name Qua
ntity
R1-R12 RF Jumpers 12
P1–P2 Power Cables Between the PSU (AC/DC) and the DCDU
2
P3-P8 Power Cables Between the DCDU and the DRFUs 6
P9 Power Cable Between the DCDU and the Fan Box 1
P10 Power Cable Between the DCDU and the BBU 1
P11-P12 Reserved 2
P13-P14 External Power Cables (220 V) 2
S1-S6 CPRI Signal Cables Between the BBU and DRFU 6
S7 E1 Transfer Cable of the BBU 1
S8 Monitoring Signal Cable for the DPMU 1
S9 Monitoring Signal Cables for the DCDU 1
S10 Monitoring Signal Cable for the Fan Box 1
S11 E1/T1 Cable of the BBU 1
Page60Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900 Overview
2. BTS3900 Hardware Components
3. Configuration of the BTS3900
Page61Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. Configuration of the BTS3900
3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
Page62Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Antenna Modes Single antenna
The DRFU module has 1 working feeder so there is no receive diversity or transmit diversity
Single antenna, double receivers The DRFU module has 1 working TX/RX feeder and 2 way receive
diversity, one of the receiver is from the another DRFU
Double antennas The DRFU module has 2 working TX/RX feeders and 2 way receive
diversity
Double antennas, 4 receivers The DRFU has 2 working TX/RX feeders and 4 way receive diversity
Page63Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Output Power in the BTS3900
Operating Frequency Band
Work Mode Output Power (GMSK/8PSK)
900 MHz Non-combination 45 W/30 W
900 MHz Combination 20 W/14 W
900 MHz PBT 71 W/47 W
1800 MHz Non-combination 40 W/26 W
1800 MHz Combination 18 W/12 W
1800 MHz PBT 63 W/42 W
Page64Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Transmit Mode and Receive Mode DRFU transmit mode
Transmit independency or combining
PBT
Dynamic PBT
Transmit diversity
DRFU receive mode
Two way receive diversity
Four way receive diversity
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Transmit Independency or Combining In transmit independency or combining mode, the system
decides which mode will work actually
In independency mode, TRX 0 occupies channel A while TRX1
occupies channel B
Interface P
rocessing Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
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Transmit Independency or Combining
Interface Processing
Unit DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
In transmit independency or combining mode, the system decides which mode will work actually In transmit combining mode ,the two TRXs will be combined and transmitted through channel A
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PBT In PBT mode, only the first TRX can work PBT mode can improve the transmitting power In PBT mode , only channel A is used by downlink signal
Interface P
rocessing Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
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Dynamic PBT Dynamic PBT is a mode based on the operation of timeslots,
compared with static PBT, it brings the balance between capacity and coverage and does not cause the 50% decrease of capacity.
The subscriber occupies a TS under the detection of measure report. When the quality is lower than a threshold, the same No. of TS of the adjacent TRX will be used as the secondary TS by the subscriber to start PBT. (The former subscriber in the secondary TS will handover) When the quality is higher than a threshold, the PBT will be canceled and the secondary TS will be released.
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Dynamic PBT
TimeslotsTimeslots TRXsTRXs
Good qualityGood quality
Poor qualityPoor quality
Signal qualitySignal quality
No signalNo signal
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Transmit Diversity
In this mode, only the first TRX can work Transmit diversity mode improves the quality of downlink signal In this mode , the signal from the first TRX is divided to 2 channels a
nd be transmitted through channel A and channel B
Interface P
rocessing Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
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Two Way Receive Diversity In this mode , both of the 2 TRXs can work Each TRX receives the signal from 2 feeders In the following figure , the TRX gets the receiving signal from channel
A and B of the single DRFU It is also possible for TRX to use the channel A receiver of another DRFU
Interface P
rocessing U
nit DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
From RX-in, TRX can also use the channel A of the other DRFU, so channel B of the two DRFUs are canceled
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Four Way Receive Diversity In this mode, only the first TRX can work The working TRX gets the uplink signal from 4 feeders of 2 DRF
Us
Interface P
rocessing
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
Interface P
rocessing
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
2 channels from the
other DRFU
Page73Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. Configuration of the BTS3900
3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
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Typical Configuration 1
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Typical Configuration 2
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Typical Configuration 3
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Typical Configuration 4
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Typical Configuration 5
Page79Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. Configuration of the BTS3900
3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
Page80Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Cable Connection 1 One DRFU module
One dual-polarized antenna
Cell Type Supported
TRX Mode Antenna Mode
S1 (without transmit diversity)
Transmit Independency or Combining
Double Antenna
S1 (with transmit diversity)
Transmit Diversity
Double Antenna
S2 (without transmit diversity)
Transmit Independency or Combining
Double Antenna
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RF Cable Connection 2 (1) Two DRFU modules
One dual-polarized antenna
Cell Type Supported
TRX Mode Antenna Mode
S2 (PBT) PBT Single Antenna
Double Receiver
S3 (without transmit diversity)
Transmit Independency or Combining
Single Antenna
Double Receiver
S4 (without transmit diversity)
Transmit Independency or Combining
Single Antenna
Double Receiver
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RF Cable Connection 2 (2) Two DRFU modules
One dual-polarized antenna
Cell Type Supported
TRX Mode Antenna Mode
S2 (with transmit diversity)
Transmit Diversity
Single Antenna
Double Receiver
S2 (4-way receive diversity)
4-Way Receive Diversity
Single Antenna
Double Receiver
S4 (transmit independency)
Transmit Independency or Combining
Single Antenna
Double Receiver
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RF Cable Connection 3 Three DRFU modules
Two dual-polarized antennas
Cell Type Supported
TRX Mode Antenna Mode
S5 (without transmit diversity)
DRFU0: Single Antenna
Double Receiver
DRFU1: Single Antenna
Double Receiver
DRFU2: Double Antenna
S6 (without transmit diversity)
DRFU0: Single Antenna
Double Receiver
DRFU1: Single Antenna
Double Receiver
DRFU2: Double Antenna
Transmit Independency or Combining
Transmit Independency or Combining
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RF Cable Connection 4
Cell Type Supported
TRX Mode
Antenna Mode
S7 (without transmit diversity)
Single Antenna Double
Receiver
S8 (without transmit diversity)
Single Antenna Double
Receiver
Transmit Independency or Combining
Transmit Independency or Combining
Four DRFU modules
Two dual-polarized antennas
Page85Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. Configuration of the BTS3900
3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
Page86Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900 Topologies - Star The star topology applies to common
areas, especially densely populated areas, such as cities.
Advantages In the star topology, each site is directly
connected to the BSC. It has the following features:
Easy networking
Easy project implementation
Easy network maintenance
Easy network expansion
High network reliability
Disadvantages Compared with other topologies, the star
topology requires more transmission cables.
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BTS3900 Topologies - Chain The chain topology applies to sparsely populated areas in strip-like terra
in, such as areas along highways and railway tracks. Advantages
The chain topology reduces cost in transmission equipment, construction, and transmission link lease.
Disadvantages As signals pass through many nodes, the transmission reliability in the chain topolo
gy is reduced. The faults in the upper-level BTSs may affect the lower-level BTSs. The number of levels in a chain network should not exceed five.
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BTS3900 Topologies - Tree The tree topology applies to areas where network
structures, site distribution, and subscriber distribution are complicated, for example, an area where large-scale coverage overlaps hot spot or small-scale coverage.
Advantages The tree topology requires fewer transmission ca
bles compared with the star topology. Disadvantages
As signals pass through many nodes, the transmission reliability is reduced. This makes it difficult for maintenance and engineering.
The faults in the upper-level BTSs may affect the lower-level BTSs.
Capacity expansion is difficult. The number of levels in the tree should not excee
d five.
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BTS3900 Topologies - Ring The ring topology applies to common scenarios. Due to its strong self-healin
g capability, the ring topology is preferred if permitted by the routing. Advantages
If there is a breaking point in the ring, the ring breaks into two chains at the breaking point automatically. In this way, the BTSs preceding and following the breaking point can work normally despite the breaking point; thus improving the robustness of the system.
Disadvantages In the ring topology, there is always a link section that does not transfer data.
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DRFU Topologies Configuration
The DRFU supports
various network
topologies: star, chain,
and ring.
Page91Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. Configuration of the BTS3900
3.1 Key parameters in BTS3900 configuration
3.2 Typical configuration
3.3 RF cable connection configuration
3.4 Topology configuration
3.5 Configuration principles
Page92Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Basic Configuration Principles A single BTS3900/BTS3900A cabinet provides up to 12 carriers with th
e maximum cell configuration of S4/4/4, and supports the dual-band application.
Minimum cost Smooth upgrade of configuration Antenna configuration principles Minimum number of DRFUs Minimum number of BBUs Highest reliability Mode of configuring two TRXs in one sector
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RF Configuration Principles A maximum of three levels of DRFUs can be connected to one BBU. For S4/4/4 cell configuration and lower configurations, the star topology is recom
mended between the BBU and the DRFU; for the configuration higher than the S4/4/4 cell configuration, the ring topology is recommended between the BBU and the DRFU.
Minimum number of antennas. Each sector of the BTS must be configured with the minimum number of antennas. For the 2-antenna receive diversity, each sector has two antenna channels; for the 4-antenna receive diversity, each sector has four antenna channels.
Non-combination in the transmit channel. The non-combination configuration is recommended for the DRFU to avoid the power loss in combination and to reduce the power consumption of the BTS. If combination is required, the cavity combiner must be configured outside the DRFU and one combination is recommended.
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Configuration Principles of the BBU Minimum number of trunk cables. You can determine the numbe
r of trunk cables as required, and take the existing configuration for saving transmission resources into account in networking.
Minimum number of UPEUs. The configuration of a single UPEU is recommended. The redundancy backup mode can be configured if required.
One BBU supports six CPRI ports. The star topology is recommended between DRFUs.
Page95Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Summary
BTS3900 functions and features
BTS3900 hardware structure and components
Working mode, typical configurations, RF cable
configurations, topology configurations,
configuration principles
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