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8/10/2019 Huawei Gsm Bts3900a Hardware Structure-20080730-B-Issue4[2].0
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2008-05
www.huawei.com
HUAWEI Confidential
Security Level: Internal Use
HUAWEI BTS3900A
Hardware Structure
ISSUE4.1
Wireless Case and training
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BTS3900A Product Description(V300R008_02)
BTS3900A Hardware Description(V300R008_02)
BTS3900A Installation Guide(V300R008_02)
APM30 User Guide
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 5
Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A Network Topology
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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,ISUPMS
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 DBS:Distributed Base Station
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 7
Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A Network Topology
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 8
Component
Board/
Module
Full Spelling Parts Configured in a Single Cabinet
Full Configuration Minimum Configuration
BSBC Universal BBU Subrack Backplane type C
(2U)
1 1
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
GATM GSM Antenna and TMA Control module 2 0
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
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 10
BTS3900A Cabinet The BTS3900A cabinet is designed in compliance
with the IEC297 standard. It is a vertical cabinet
and white in color.
Configuration Type Width
(mm)
Depth
(mm)
Height
(mm)
RF cabinet 600 480 700
APM30 power
distribution cabinet
600 480 700
Cabinet base 600 480 200
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BTS3900A Typical Hardware Configuration
Cabinet structure based on the extended
cabinet configuration includes
6RFU RF cabinet and the APM30 power
distribution cabinet.
3RFU RF cabinet and the APM30 power
distribution cabinet.
6RFU RF cabinet, APM30 power distribution
cabinet, extended APM30 transmission cabinet,
and extended APM30 battery cabinet.
(1) RF cabinet (2) Double radio filter unit (3) Fan module
(4) Fan environmentmonitor
(5) Direct currentdistribution unit (four
outputs)
(6) GSM antennaand TMA control
module
(7) Baseband unit (8) Power distribution unit (9) EPS4890
(10) APM30 power
distribution cabinet
- -
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 12
BTS3900A Typical Hardware Configuration
Cabinet structure based on the extended
cabinet configuration includes
6RFU RF cabinet and the APM30 power
distribution cabinet.
3RFU RF cabinet and the APM30 power
distribution cabinet.
6RFU RF cabinet, APM30 power distribution
cabinet, extended APM30 transmission cabinet,
and extended APM30 battery cabinet.
(1) Battery (2) RF cabinet (3) Double radio filter unit
(4) Fan module (5) Fan environmentmonitor (6) Direct currentdistribution unit (four outputs)
(7) GSM antenna
and TMA control
module
(8) Baseband unit (9) Power distribution unit
(10) EPS4890 (11) APM30 power
distribution cabinet
-
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 13
BTS3900A Typical Hardware Structure
Cabinet structure based on the extended
cabinet configuration includes
6RFU RF cabinet and the APM30 power
distribution cabinet.
3RFU RF cabinet and the APM30 power
distribution cabinet.
6RFU RF cabinet, APM30 power distributioncabinet, extended APM30 transmission cabinet,
and extended APM30 battery cabinet.
(1) RF cabinet (2) Double radio filter unit (3) Fan module
(4) Fan environment
monitor
(5) Direct current
distribution unit (four
outputs)
(6) GSM antenna and
TMA control module
(7) Baseband unit (8) Power distribution unit (9) EPS4890
(10) APM30 power
distribution cabinet
(11) Direct current
distribution unit (nine
outputs)
(12) Transmission unit
(13) Extended APM30
transmission cabinet
(14) Battery (15) Extended APM30
battery cabinet
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 14
BTS3900A Local Structure
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Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
Section 4 DRFU Work Mode
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 16
Power Distribution Cabinet Hardware Components
BBU
Power Frame (AC/DC) APMI
AFMU
PDU
GATM Module
Heater
Battery
Sensors
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 17
BBU Logical Structure
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BBU Hardware Structure
The typical power consumption of the BBU is 35 W.
The weight of the BBU isn’t more than 10KG.
The BBU is a small box with all the external ports on the front panel.
The BBU3900 boards consist of the BSBC, UEIU, GTMU, and UELP; the
BBU3900 modules consist of the UBFA and the UPEU.
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BBU Board--BSBC
The BSBC is the backplane of the BBU. The BSBC provides eight
board slots, two power slots, and one fan slot.
The universal BBU sub-rack backplane type C (2U) (BSBC) provides
backplane interfaces for communication between boards and supplies
power for boards.
The GTMU is located in slots 5 and 6, slot 7 for a main control board
that supports 3G, and other ports are as common slots.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 21
BBU Board--GTMU
Ports on the Panel
Port Type Description
CPRI0 –
CPRI5
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 throughthe 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.
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BBU Board--GTMU LEDs on the board
LED Color Status DescriptionRUN 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.
LIU0 –LIU3 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.
CPRI0 –
CPRI5
Green On The CPRI link is functional.
Red On The reception of the optical module is
abnormal and an alarm is generated.
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BBU Board--GTMU
DIP Switch
DIP Switch DIP Status Description
1 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.
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.
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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.
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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 twiceper second
The board is not securelyconnected. An alarm is not
generated.
Red On An alarm is generated.
Green Blinking onceevery two
seconds
The board operates normally.
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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.
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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
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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.
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BBU Module—UEIU
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
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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 maleconnector
E1 transfer cableof the BBU
Transfers the four E1/T1 signals between the UELPand 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
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BBU Cable connection
The BBU3900 cables are classified into the PGND cable, -48VDC
power cable, E1/T1 cable, E1 transfer cable, environment monitoringsignal 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:
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BBU Cables
The cables figure of the BBU
-48VDC power cables E1 transfer cable
FE cable CPRI optical cable
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BBU Cables
The cables figure of the BBU
(1)RJ45 Connector (2) Cord end terminal
Monitoring signal cable between the APM and the BBU
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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.
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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
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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.
P S b k (AC/DC) PMU M d l
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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 alarmWater damage alarm
Smoke alarm
Power module alarm
Load shutdown alarm
Off No alarm is generated.
P S b k (AC/DC) PMU M d l
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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 01010 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
P S b k (AC/DC) PSU M d l
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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
protectionLED (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.
P S b k (AC/DC) Wi i U it
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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
APMI Board
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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)
APMI Board
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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 outputcable
AFMU Board
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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.
AFMU Board
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AFMU Board
Ports and LE on the Panel
SN Port Function1 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.
PDU Module
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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 the distributed base station or the separated base station
Reports the surge protection alarms of the DC output power
PDU Module
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PDU Module The port on the panel
SN Description1 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)
GATM Module
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GATM Module
The GSM antenna and TMA control module (GATM) is a module
that controls the antenna and TMA. The GATM is optional.
The GATM performs the following functions:
Controls the RET antenna
Feeds power to the TMA
Reports the RET control alarm signals
Monitors the current from the feeder
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GATM Module
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GATM Module
LEDs on the board
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 over-
current alarm.
Off The module runs normally.
Heater
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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.
Battery
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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 installedin the 6 U space at the bottom, and the
remaining 2 U space can be used to install
the user devices.
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Sensors
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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.
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Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
Section 4 DRFU Work Mode
RF Cabinet Hardware Components
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DRFU
DCDU-02
FAN Unit
FMUA
Battery
Door Sensor
DRFU Logical Structure
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The DRFU performs modulation and demodulation between baseband
signals and RF signals, processes data, and combines and divides
signals.
The DRFU consists of the high-speed interface unit, signal processing
unit, power amplifier, and dual-duplexer.
DRFU Board
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Ports on the panel
Type Connector Ports DescriptionPort for
transceiving
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 2RX2 out Output port of diversity signals in
antenna channel 2
Power port 7W2 power
connector
PWR Receives power input
DRFU Board
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LEDs on the Board
LED Status MeaningRUN 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.
DRFU Board
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LEDs on the Board
LED Status MeaningVSWR 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.
DCDU-02 Module
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The direction current distribution unit (DCDU) provides
-48 V DC power (four outputs).
Functions of the DCDU:
Receiving -48 V DC power input
Providing -48 V DC power for boards and modules in the
cabinet
Providing lightning protection of 10 kA in differential
mode and 15 kA in common mode. Providing dry contact
for surge protection failure.
the DCDU (four outputs) on the left of the cabinet
the DCDU (four outputs) on the right of the cabinetPrinciples of the DCDU
DCDU-02 Module
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Ports on the Panel
Item Label Description
Power input
terminal
NEG(-) DCDU low level input terminal
RTN(+) DCDU high level input terminal
Powerswitch
RFU0-RFU5,FMUA, and
Spare
RFU0-RFU2 control the DC outputs to three DRFUs on the left ofthe cabinet. RFU3-RFU5 control the DC outputs to three DRFUs
on the right of the cabinet. FMUA controls the DC output to the
FMUA. Spare controls the DC output of the Spare.
Power
output port
RFU0-RFU5,
FMUA, and
Spare
RFU0-RFU2 supply power to three DRFUs on the left of the
cabinet. RFU3-RFU5 supply power to three 3 DRFUs on the right
of the cabinet. FMUA supplies power to the FMUA. Spare is
reserved.
Dry contact
output port
SPD ALM Dry contact alarm output port
Fan Module
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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 .
FMUA Board
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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 rotationspeed 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.
FMUA Board
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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.
FMUA Board Ports on the panel
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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 distributionunit
Fan port FAN0 4-pin connector Used in connection to the fan module on the
left half subrackFAN1
FAN2 4-pin connector Used in connection to the fan module on the
right half subrackFAN3
Booleanport 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
Batteries in the RF Cabinet
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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
Door Status Sensor in the RF Cabinet
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The door status sensor detects the opening and closing of the cabinet door.
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Section 1 System Structure
Section 2 PD Cabinet Hardware Component
Section 3 RF Cabinet Hardware Component
Section 4 DRFU Work Mode
BTS3900A Configuration Principles
Configuration Principles of the BBU
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Configuration Principles of the BBU
Minimum number of trunk cables. You can determine the number of trunk cables as
required, and take the existing configuration for saving transmission resources intoaccount 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.
BTS3900A Configuration Principle
Configuration Principles of DRFU
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Configuration Principles of DRFU
A single DRFU does not support the S1/1 application; however, three DRFUs
support the S3/3 application. The cell configuration of S4 and lower configurations use a single antenna, the
configurations of S5 to S8 use a double antenna, and the configurations of S8 to
S12 use a triple antenna.
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.
DRFU Internal Structure
2 TRXs and 2 duplexers are integrated in DRFU module which can be
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p g
connected to antenna directly.
The RX_IN/OUT port of DRFU can support the receiving signalinterconnection between 2 DRFUs, so that it can support the diversity
receiving between 2DRFUs.
DRFU Antenna Mode
Single antenna, double receivers
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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.
DRFU Transmit and Receive Mode
DRFU transmit mode
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Transmit independency or combining
PBT
Transmit diversity
DRFU receive mode
Two way receive diversity
Four way receive diversity
DRFU Transmit Mode--TransmitIndependency or Combining Transmit Independency
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Transmit Combining
I n t e r f a c e
P r o c e s s i n g Uni t
DUP
DUP
CPRI0
CPRI1
ANT1
ANT2
I n t e r f a c e
P r o c e s s i n g Uni t
DUP
DUP
CPRI0
CPRI1
ANT1
ANT2
DRFU Transmit Mode--PBT
In PBT mode, only the first TRX can work.
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PBT mode can improve the transmitting power.
In PBT mode,only channel A is used by downlink signal.
I n t e r f
a c e
P r o c e
s s i n g Uni t
DUP
DUP
CPRI0
CPRI1
ANT1
ANT2
DRFU Transmit Mode--Transmit Diversity
In this mode, only the first TRX can work
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Transmit diversity mode improves the quality of downlink signal
In this mode,the signal from the first TRX is divided into 2 channels and betransmitted through channel A and channel B.
I n t e r f a c e
P r o c e s s i n g Uni t
DUP
DUP
CPRI0
CPRI1
ANT1
ANT2
DRFU Receive Mode-- Two Way ReceiveDiversity In this mode,both of the 2 TRXs can work
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Each TRX receives the signal from 2 feeders
In the following figure,the TRX gets the receiving signal from channel A andB of the single DRFU, It is also possible for TRX to use the channel A
receiver of another DRFU.
CPRI0
CPRI1
I n t e r f a c e P r o c e s s i n g Uni t
DUP
DUP
ANT1
ANT2
RX-IN
RX_OUT
From RX-in, TRXcan also use the
channel A of the
other DRFU, so
channel B of the
two DRFUs are
canceled
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Chapter 1 BTS3900A System Description
Chapter 2 BTS3900A Hardware Structure
Chapter 3 BTS3900A network Topology
BTS3900A Topology BTS Topology
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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 DRFUs support multiple network topologies such as star, chain, and
ring topologies.
Only optical fiber can be used between DRFU and BBU.
BTS Topology
The topologies of the BTS are classified into star, chain, tree, and ring
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p g , , , g
topologies.
Star mode Tree mode
Chain mode Ring mode
DRFU Topology
The BBU and DRFUs support multiple network topologies such as star,
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chain, and ring topologies.
Summary
BTS3900A F ti d F t
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BTS3900A Function and Features
BTS3900A Hardware Structure
,such as BBU and DRFU etc.
BTS3900A Network Topology
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Thank You
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