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Bts3900a
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2008-05
www.huawei.com
HUAWEI Confidential
Security Level: Internal Use
HUAWEI GSM-R BTS3900A
Hardware Structure
ISSUE4.0
Wireless Case and training
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 2
The BTS3900A developed by Huawei is an outdoor macro
BTS that performs the same tasks as the BTS3900. The
BTS3900A mainly consists of the BBU and DRFUs. Compared
with traditional BTSs, the BTS3900A features simpler structure
and higher integration.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 3
Know the functions and features of BTS3900A
Master the Hardware structure and function of BTS3900A
Master the Network topologies of BTS3900A
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 4
BTS3900A Product DescriptionV301R013)
BTS3900A Hardware DescriptionV301R013)
BTS3900A Installation GuideV301R013)
APM30 User Guide
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 5
Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A Network Topology
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 6
Location
MS
PSTN
ISDN PSPDN
Um Interface
BTS3900A
BTS3900A
BTS3900A
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAP
TUP,ISUP 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 DBSDistributed Base Station
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 7
Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A Network Topology
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 8
Component
Board/
Module
Full Spelling Parts Configured in a Single Cabinet
Full Configuration Minimum Configuration
UEIU Universal Environment Interface Unit 1 0
GTMU GSM Transmission & 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 2 2
FMUA Fan Environment Monitor 1 1
FAN Fan Module 2 2
- Door Status Sensor 1 1
- Smoke Sensor 1 1
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 9
Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Outdoor BTS3900A Ver.D cabinet
Page 10
BTS3900A (AC) Ver,D BTS3900A (DC) Ver,D
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Outdoor IBBS200D/IBBS200T Ver.D
cabinet
Page 11
IBBS200D Ver,D IBBS200T Ver,D
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 12
BTS3900A Local Structure
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 13
Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
Section 4 DRFU Work Mode
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 14
Power Distribution Cabinet Hardware Components
BBU
Power Frame (AC/DC)
APMI
AFMU
PDU
Heater
Battery
Sensors
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 15
BBU Logical Structure
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 16
BBU Hardware Structure
The BBU is a small box with all the external ports on the front panel.
The BBU3900 boards consist of the UEIU, GTMU, and UELP; the BBU3900
modules consist of the UBFU and the UPEU.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 17
BBU Board--GTMU
The GSM transmission, timing, and management unit for BBU (GTMU)
controls and manages the entire BTS. It provides interfaces related to
the reference clock, power supply, OM, and external alarm collection.
The GTMU performs the following functions: Controls, maintains, and operates the BTS.
Supports fault management, configuration management, performance
management, and security management.
Supports the monitoring of the fan module and power supply module.
Distributes and manages BTS3900 clock signals. Provides clock input for testing.
Provides port for terminal maintenance.
Supports four E1 inputs.
Provides CPRI ports for communication with the RF modules .
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 18
BBU Board--GTMU
Ports on the Panel
Port Type Description
CPRI0CPRI5
SFP
connector
Provides the input and output of optical and electrical transmission
signals
ETH RJ45
connector
Local maintenance and commissioning
FE0 RJ45
connector
A reserved port that performs the following function:
Connects the BBU to a routing device in the equipment room through
the Ethernet cable to transmit network information
FE1 DLC
connector
A reserved port that performs the following function:
Connects the BBU to a routing device in the equipment room through
the optical cable to transmit network information
USB USB
connector
A reserved port that performs the following function:
Automatically upgrades the software through the USB disk
TST USB
connector
Testing of the output clock signals by using a tester
E1/T1 DB26 male
connector
Provides the input and output of the four E1/T1 signals between the
GTMU and the UELP or between the GTMU and the BSC.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 19
BBU Board--GTMU LEDs on the board
LED Color Status Description
RUN Green On The board is faulty.
Off There is no power supply or the board is
faulty.
Blinking once every two seconds The board is operational.
Blinking once every four seconds The OML link is abnormal.
Blinking four times per second The board is loading software.
ALM Red On A fault occurs in the running board.
Off An alarm is not generated.
ACT Green On The board is operational.
Off The board is faulty.
LIU0LIU3 Green On A local E1/T1 alarm is generated.
Blinking four times per second A remote E1/T1 alarm is generated.
Off This link is not used or the alarm is cleared.
CPRI0CPRI5
Green On The CPRI link is functional.
Red On The reception of the optical module is
abnormal and an alarm is generated.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 20
BBU Board--GTMU
DIP Switch
DIP Switch DIP Status Description
1 2
SW1 ON ON The E1 impedance is set to 75 .
OFF ON The E1 impedance is set to 120 .
ON OFF The T1 impedance is set to 100 .
DIP Switch DIP Status Description
1 2 3 4
SW2 ON ON ON ON The E1 cable is grounded.
OFF OFF OFF OFF The E1 cable is not grounded.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 21
BBU Board--GTMU
DIP Switch
DIP
Switch
DIP 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.
DIP
Switch
DIP 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.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 22
BBU Module--UBFA
The universal BBU fan unit type A (2U) (UBFA) communicates with the
GTMU to regulate the temperature, adjust the fan speed, and report
alarms. The UBFA module is hot swappable.
LED Color Status Description
STATE Green Blinking twice
per second
The board is not securely
connected. An alarm is not
generated.
Red On An alarm is generated.
Green Blinking once
every two
seconds
The board operates normally.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 23
BBU Module--UPEU
The universal power and environment interface unit type A/B ((UPEU)
supports the 48 V DC(UPEA)/+24V(UPEB) power input, supplies
power to the boards, modules, and fan in the BBU, and provides
access to multiple environment monitoring signals.
The UPEU performs the following functions:
Supplies power to the boards, modules, and fans.
Introduces environment monitoring signals to the BBU.
Reports fault signals, in-position signals, and version information
associated with the boards and modules.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 24
BBU Module--UPEU
Ports on the Panel
Label Connector Description
PWR 3V3 +24 V/-48 V DC power input
EXT-ALM1 RJ45 Transmitting eight dry contact alarms
EXT-ALM0 RJ45
MON1 RJ45 Transmitting two RS485 environment monitoring signals
MON0 RJ45
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 25
BBU Board--UEIU
The universal environment interface unit (UEIU) supports multiple
environment monitoring signals. The UEIU supports eight Boolean
alarm signals and two RS485 environment monitoring signals.
The UEIU is optional. It is configured when the environment interfaces
are insufficient.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 26
BBU ModuleUEIU
Ports on the Panel
Label Connector Description
EXT-ALM1 RJ45 Transmitting eight dry contact alarms
EXT-ALM0 RJ45
MON1 RJ45 Transmitting two RS485 environment monitoring signals
MON0 RJ45
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 27
BBU Board--UELP
The universal E1/T1 lightning protection unit (UELP) provides lightning
protection for four E1/T1 signals.
Port Type Cable Description
INSIDE DB25 male
connector
E1 transfer cable
of the BBU
Transfers the four E1/T1 signals between the UELP
and the GTMU
OUTSIDE DB26 male
connector
E1/T1 cables of
the BBU
Provides the input and output of the four E1/T1
signals between the BBU and the BSC
The UELP has one DIP switch, which is used to set the impedance on the
E1/T1 port. There are four DIP bits on the DIP switch.
DIP Switch DIP Status Description
1 2 3 4
S1 ON ON ON ON The E1 impedance is set to 75 ohms. The E1
is grounded (unbalanced mode).
OFF OFF OFF OFF Other modes
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 28
BBU Cable connection
The BBU3900 cables are classified into the PGND cable, -48VDC
power cable, E1/T1 cable, E1 transfer cable, environment monitoring
signal cable, CPRI signal cable between the BBU and the RRU, and
BBU monitoring signal cable.
The cable connection relations of the BBU are as follows:
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 29
BBU Cables
The cables figure of the BBU
-48VDC power cables E1 transfer cable
FE cable CPRI optical cable
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 30
BBU Cables
The cables figure of the BBU
(1)RJ45 Connector (2) Cord end terminal
Monitoring signal cable between the APM and the BBU
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 31
Power Subrack (AC/DC)
Power Subrack (AC/DC) connects with external 220VAC power input.
The 220VAC power is converted to -48VDC power and then connects
with DCDU module.
PMU (Power and Environment Monitoring Unit) module manages the power
supply and batteries. The DPMU is the core of the power monitoring system.
PSU (Power Supply Unit) module Converts the 220 V AC power into the -48 V
DC power.
Wiring unit is used to connect with 220VAC power input cable and connects the
cable from DCDU module.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 32
Power Subrack (AC/DC)PMU Module The DPMU manages the power supply and batteries. The DPMU is
the core of the power monitoring system.
The DPMU performs the following functions:
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.
(1) LEDs (2) Power supply test ports
(3) RS232/RS422 ports (4) Battery control switch
(5) COM port - (1) Backplane port (2) DIP switch
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 33
Power Subrack (AC/DC)PMU Module Ports on the panel
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 multi-meter.
COM port Used in connection to the external signal transfer board.
Backplane
port
Used in connection to the backplane.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 34
Power Subrack (AC/DC)PMU Module LED on the module
LED Color Status Meaning
RUN Green Blinking once every
two seconds
The module is functional, and the communication with
the central processing unit is normal.
Blinking four times
per second
The module is functional, but the communication with
the central processing unit fails.
Steady on/steady off The module is faulty (not in the power-on self-check
state).
ALM Red On The following alarms are generated:
Mains over-voltage or under-voltage alarm
Busbar over-voltage or unde-rvoltage alarm
Battery charging over-current alarm
Battery shutdown alarm
Batteries loop failure alarm
Ambient temperature alarm
Ambient humidity alarm
Water damage alarm
Smoke alarm
Power module alarm
Load shutdown alarm
Off No alarm is generated.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 35
Power Subrack (AC/DC)PMU Module DIP Switch
Bit 3 Bit 2 Bit 1 Bit 0 Monitoring Address
0 0 0 0 0000
0 0 0 1 0001
0 0 1 0 0010
0 0 1 1 0011
0 1 0 0 0100
0 1 0 1 0101
0 1 1 0 0110
0 1 1 1 0111
1 0 0 0 1000
1 0 0 1 1001
1 0 1 0 1010
1 0 1 1 1011
1 1 0 0 1100
1 1 0 1 1101
1 1 1 0 1110
1 1 1 1 1111
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 36
Power Subrack (AC/DC)PSU Module The PSU (AC/DC) has the following functions:
Converts the 220 V AC power into the -48 V DC power
Monitors 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
Monitors the charging and discharging of the batteries
LED Color Status Meaning
Power 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.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 37
Power Subrack (AC/DC)Wiring Unit The power subrack works in the following environment:
The wiring unit is connected to the external power supply through the terminals
L and N wires, and leads the power to the PSU (AC/DC) through the
backplane.
The PSU (AC/DC) converts the input AC power into the -48 V DC power.
The DPMU monitors the operating status of the PSU (AC/DC).
The wiring unit provides -48 V DC power outputs through LOAD1(-), LOAD2(-),
and RTN(+).
(1) PMU Module (2) PSU Module (AC/DC) (3) Wiring Unit
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 38
APMI Board The APMI board refers to APM Power Monitor unit Interface board. The
APMI board is located at the upper left corner of the APM30 cabinet,
and performs the following functions:
Transfers the APM30 serial port communication signals, Boolean
input/output signals, and EMI signals.
Protects the dry contact input/output signals and RS485 signals
(connected to the BBU/BTS)
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 39
APMI Board Port on the panel
Port Connector Type Quantity Function
RS422 RJ45 connector 1 Connecting the monitoring signal cable
between the PMU and the APMI
TX+, TX-,
RX+, RX-
2-pin molex connector 2 Connecting the monitoring signal cable
between the APMI and the BBU
IN1-IN3 2-pin molex connector 3 Connecting the dry contact alarm input cable
OUT1 2-pin molex connector 1 Connecting the optical coupling alarm output
cable
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 40
AFMU Board The AFMU board refers to APM Fan Monitor unit Interface Board. The
AFMU board is located at the upper right corner of the APM30 cabinet,
and performs the following functions:
Provides DC power supply to the APMI and AFMU boards through the DC
power port
Supplies DC power to the two fans at the top of the cabinet and reports the
alarms of the fans
Reports the alarms of the internal ambient temperature sensor, air inlet
temperature sensor, and air outlet temperature sensor
The alarm signals of the AFMU board is transported to the APMI board
through
the signal transfer cable and then is reported to the BBU.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 41
AFMU Board Ports and LED on the Panel
SN Port Function
1 ALM Connecting the monitoring signal
cable between the AFMU and the
APMI
2 DC
INPUT
Connecting the DC power cable
of the AFMU
LED Silkscreen Color Status Description
Operation
LED
RUN Green ON steady About 1 minute after the AC or DC power-on
Blinking for 1s ON
and 1s OFF
The system is working properly.
Blinking for 0.125s
ON and 0.125s OFF
The serial port communication is disrupted.
The other communication is normal.
OFF steady The system is not powered on.
Alarm LED ALM Red ON steady An alarm is generated.
OFF steady No alarm is generated, or the system is not
powered on.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 42
PDU Module The PDU (short for Power Distribution Unit) performs AC or DC power
distribution.
The AC distribution functions of the PDU are as follows:
Supplies two AC power outputs with the maximum current of 10 A to the heaters
of the power cabinet and the heating film of the battery cabinet.
Reports the surge protection alarms of the AC input power .
The DC distribution functions of the PDU are as follows:
Provides 10 DC power outputs to meet the DC power requirements of t
he distributed base station or the separated base station
Reports the surge protection alarms of the DC output power
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 43
PDU Module The port on the panel
SN Description
1 AC wiring terminals
For the 110 V dual-live-wire input, use L2
For the single-phase 220 V/three-phase 220 V input, use N1 and N2
2 AC wiring terminals
For the 110 V dual-live-wire input, use L1
For the single-phase 220 V/three-phase 220 V input, use L1, L2 and L3
3 AC output wiring terminals (Lout1, Lout2)
4 AC output wiring terminals (Nout1, Nout2)
5 AC input MCB
6 AC output MCB (controls the power supply to the heating film or heaters)
7 DC output MCBs (SW0-SW9)
8 DC output wiring terminals (LOAD0-LOAD9)
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 44
Heater
The heater functions in the low-temperature environment to provide
suitable working temperature for the batteries in the power cabinet or
transmission cabinet. When the working temperature is lower than the
temperature specification for the battery, the battery capacity declines.
So the heater is installed in the battery cabinet to provide the optimal
working temperature for the batteries.
The technical specifications of the heater are as follows:
A heater keeps the cabinet temperature higher than 10. When the internal
temperature of the cabinet is lower than 5, the heater starts to work; when
the internal temperature is higher than 15, the heater stops working.
The maximum power consumption of a 220 V heater is 300 W.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 45
Battery
The power cabinet can house 1 to 3 groups of -48 V 12 AH batteries,
which can form the -48 V 12 AH battery group system, the -48 V 24 AH
system, or the -48 V 36 AH system. The details are as follows:
The -48 V 12 AH or -48 V 24 AH battery group is installed in the 3 U space
at the bottom, and the remaining 5 U space can be used to install the user
devices.
The -48 V 36 AH battery group is installed
in the 6 U space at the bottom, and the
remaining 2 U space can be used to install
the user devices.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 46
Sensors Door Status Sensor
The door status sensor is made up of two parts, the magnet part and the switch part.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 47
Sensors Temperature Sensor
The temperature sensors of the APM30 consist of the air inlet temperature
sensor, internal ambient temperature sensor, and the air outlet temperature sensor.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 48
Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
Section 4 DRFU Work Mode
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 49
RF Cabinet Hardware Components
DRFU
DCDU
FAN Unit
FMUA
Battery
Door Sensor
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 50
MRFUd Logical Structure
The MRFUd performs modulation and demodulation between baseband
signals and RF signals, processes data, and combines and divides
signals.
The MRFUd consists of the high-speed interface unit, signal processing
unit, power amplifier, and dual-duplexer.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Appearance and Interfaces
Page51
CPRI interface capacity item quota
CPRI interface quantity 2
CPRI interface rate 1.25Gbit/s or 2.5Gbit/s
supporting CPRI networking
mode
binary star mode
Interface type
Connectors type
quantity
instruction
RF interface
DIN
2
for connecting the antenna feeder system
RF receipt signal interconnection interface
QMA female
2
for RF module interconnection
CPRI interface
SFP female
2
for connecting to BBU3900
power interface
3V3
1
-48V power input
monitor interface
RJ45
1
monitor and maintenance
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 52
MRFUd Board
LEDs on the Board
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 MRFUd is being tested on the Site
Maintenance Terminal.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 53
MRFUd Board
LEDs on the Board
LED Status Meaning
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.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 54
DCDU Module
The direction current distribution unit (DCDU) provides -48V DC
power of 10 outputs.
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.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 55
DCDU Module
Panel of the DCDU (10 outputs)
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, MRFUd, and fan box
Power
switch
SPARE2, SPARE1, BBU,
FAN, and RFU5-RFU0
Power switch controlling the 10 outputs for the
BBU, MRFUd, and fan box
Alarm
output port
SPD ALM Dry contact alarm output port
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 56
Fan Module The fan module performs the heat dissipation for the cabinet. One
fan module is installed with two fans.
The fan module performs the following functions:
Providing forced ventilation and dissipation for the cabinet
Reporting the temperature and rotation speed of the fans to the fan monitoring
board.
Interface
There is one interface on the panel. It is used to connect FMUA-FAN monitor
signal cable. The information of FAN temperature and speed will be sent to
FUMA with this interface. It also provide the power to FAN .
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 57
FMUA Board The FMUA (Fan Environment Monitor) is a fan environment monitoring
unit.
The FMUA performs the following functions: Leading -48 V DC power supply to the cabinet and supplying -48 V DC power supply
for the fan module.
Collecting environment alarm information in the cabinet. The environment alarm is
classified into temperature alarm, humidity alarm, smoke alarm, water immersion alarm,
and door status alarm.
Collecting surge protection alarm information of the DC power distribution unit.
Monitoring the operating status of fans. Supporting two modes of adjusting the rotation
speed of the fans: adjustment based on the temperature and adjustment controlled by
the main control unit.
Controlling the fan rotation. Stopping the rotation of the fans when the ambient
temperature is low.
Supporting the detection and reporting of the temperature.
Supporting the cascading and extension of RS485 ports. FMUAs can be cascaded.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 58
FMUA Board LED on the board
LED Color Description Status Description
RUN Green Indicates the
running status of
the board
Blinking once every
two seconds
The board is running normally and the
communication with the BBU is normal.
Blinking four times
per second
There is power supply but the
communication with the BBU is
abnormal.
Off No power input is available.
ALA
RM
Red Indicates
whether there
are alarms
Blinking four times
per second
There are alarms from both the fans on
the left and right half subracks.
Blinking once every
two seconds
There is an alarm from the fan on the
right half subrack.
On There is a alarm from the fan on the left
half subrack
Blinking once every
four seconds
Other alarms
Off No power input is detected.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 59
FMUA Board Ports on the panel
Type Ports Connector Description
Power port -48 V 7W2 power connector 48 V DC power input
RS485 port COM IN RJ45 connector Used in connection to the BBU or the
monitoring port on the upper-level FMUA
COM OUT RJ45 connector Used in connection to the lower-level FMUA
TEM RJ45 connector Cabinet temperature monitoring port
TEM_HUM
ARRESTER
RJ45 connector Used in connection to the surge protection
failure alarm port of the power distribution
unit
Fan port FAN0 4-pin connector Used in connection to the fan module on the
left half subrack FAN1
FAN2 4-pin connector Used in connection to the fan module on the
right half subrack FAN3
Boolean
port
The first group
(from left to right)
Dry contact connectors Extended Boolean ports
The second group Dry contact connectors
The third group Dry contact connectors Smoke sensor port, door status sensor port
The fourth group Dry contact connectors Water sensor ports
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 60
Batteries in the RF Cabinet
The batteries in the 3RFU cabinet serve as the power backup for the
BTS.
The -12 V 50 Ah battery or -12 V 92 Ah battery is allowed in the 3RFU
cabinet. The battery combination is as follows:
When the -12 V 50 Ah battery is used, four batteries in serial connection can
be configured to serve as the power backup of -48 V 50 Ah.
When the -12 V 92 Ah battery is used, four batteries in serial connection can
be configured to serve as the power backup of -48 V 92 Ah.
(1) -12 V 50 Ah battery (2) -12 V 92 Ah battery
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 61
Door Status Sensor in the RF Cabinet
The door status sensor detects the opening and closing of the cabinet door.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 62
Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 63
Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A network Topology
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 64
BTS3900A Topology BTS Topology
The topologies of the BTS are classified into star, chain, tree, and ring topologies.
E1/T1 cable can be used between BBU and BSC or transmission equipment,
Optical and LAN cable can be used between BBU and route equipment.
DRFU Topology
The BBU and MRFUd support multiple network topologies such as star, chain, and
ring topologies.
Only optical fiber can be used between MRFUd and BBU.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 65
BTS Topology
The topologies of the BTS are classified into star, chain, tree, and ring
topologies.
Star mode Tree mode
Chain mode Ring mode
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 66
Summary
BTS3900A Function and Features
BTS3900A Hardware Structuresuch as BBU and MRFUd etc.
BTS3900A Network Topology
Thank You
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