WCDMA BTS3900 Hardware Structure

PowerPoint physical layer of Uu interface
BTS3900 is a new generation indoor
marco NodeB which is produced by
Huawei Co. Ltd.
1.The BTS3900 is Huawei's new generation WCDMA cabinet-type indoor macro NodeB.
2.It employs the industry-leading design where multiple products use uniform modules.
3.It features small size, large capacity, low power consumption, and quick deployment.
HUAWEI TECHNOLOGIES CO., LTD.
Upon completion of this course, you will be able to:
Master the hardware structure of BTS3900
Master the working principle of different subsystems and
boards of BTS3900
Know typical configurations of BTS3900
WBBPa
WRFU
UEIU
UFLP
UPEU
UAEU
UIEU
UTRP
APM
Iu-BC
RNC
RNC
NodeB
NodeB
NodeB
CS
PS
CBC
UE
UTRAN
CN
Uu
Iu
Iu-CS
Iu-PS
Iu-BC
Iur
Iub
Iub
Iub
Section 1 BTS3900 Introduction
Section 5 BTS3900 Cables
≤ 120Kg
+21.6 V DC to +29 V DC
200 V AC to 240 V AC
200 V AC to 240 V AC 176 V AC to 290 V AC, single-phase
200 V AC/346 V AC to 240 V AC/415V AC
176 V AC/304 V AC to 290 V AC/500 V AC, three-phase
Working Temperature
-20+50
The BTS3900 cabinet is designed in compliance with the IEC297 standard. It is a vertical cabinet.
+ 24VDC
1U
9U
2U
1U
1U
19U
2U
2U
1U
1. The BTS3900 WCDMA cabinet with -48 V DC input includes the WRFU, FAN unit, BBU, DCDU. You can optionally install devices with 2 U in height inside the spare space of the cabinet. The only difference is that the BBU and the SLPU are installed only in bottom cabinets. The SLPU is an optional module of the BTS3900 WCDMA cabinet (-48 V).
2. The BTS3900 WCDMA with the +24 V DC power input includes the WRFU, FAN unit, BBU, DCDU, and PSU (DC/DC).
3. The BTS3900 WCDMA with -48 V DC input includes the WRFU, FAN unit, BBU, DCDU, PSU (AC/DC), and PMU.
3U
The BTS3900 WCDMA cabinet (-48) supports single cabinets and stacked cabinets. For stacked cabinets, top cabinets and bottom cabinets have similar structures.
The BTS3900 WCDMA cabinet (+24 V) supports the installation of single cabinet and stacked cabinets (-48 V). In stacked installation mode, the +24 V cabinet must be installed at the bottom, and the BBU must be installed only in the +24 V cabinet
3. The BTS3900 WCDMA cabinet (220 V) supports the installation of the single cabinet and stacked cabinets (-48 V). In stacked installation mode, the 220 V cabinet must
be installed at the bottom, and the BBU must be installed only in the 220 V cabinet.
System capacity specifications:
BTS3900 can support up to: uplink 1536 CEs and downlink 1536 CEs
BTS3900 can support up to: 3*8 cells or 6*4 cells
Characteristics
Networking mode: star, chain, tree and hybrid
Synchronization clock sources: Iub interface clock, GPS, and internal clock
Handover types: softer handover, soft handover and hard handover
Services: CS services, PS services , mixed services and position services
Enhanced functionsRET , HSDPA , HSUPA phase II
CS (circuit domain) services,
HSUPA( Cell Multimedia Broadcast)
Iub interface clock: In ATM transmission mode, you can extract from the Iub port 8 kHz clock with the precision as 0.05 ppm.
In IP transmission mode, you can obtain from the FE port the IP packages that are sent from the Clock Server at a scheduled time.
2. GPS clock: With a frequency stability of 0.0001 ppm, the GPS card provides long-term stable clock signals for the NodeB.
The NodeB provides the input port for the GPS clock and obtains the clock source through the external GPS device. This enables the BBU to receive the
GPS clock signals when the upper-level clock is unstable or unavailable.
3. Internal clock: In the absence of external clocks, the internal clock can ensure that the NodeB works normally for at least 90 days.
The internal clock source employs the high-performance crystal oscillator and combines the advanced algorithm and the software phase-locking technology
so that the internal clock source meets or exceeds the stratum-3 clock standard. The precision of the internal clock is higher than 0.05 ppm.
+24V/220V
-48V
Signal
Current
1.BTS3900 employs the modular design. Based on the functions of modules, it comprises the baseband transmission control module, RF module, and power module.
2. Baseband Transmission Control Module Functions:
Providing physical interfaces from the NodeB to the RNC for data communication
Providing maintenance channels to connect to the OMC (LMT or M2000)
Processing uplink and downlink baseband signals
Centralizing the management of the entire NodeB system in terms of OM and signaling processing, and providing system clocks
3.RF Module Functions:
Receiving the downlink baseband data sent from the baseband transmission control module, transmitting uplink baseband data to the baseband transmission control module, and forwarding the data of cascaded RRUs
Providing the RF receiving channel and the RF transmitting channel
Amplifying the low-power RF signals from the TRX
Multiplexing RX and TX signals through RF channels, enabling RX and TX signals to share the same antenna path, and filtering RX and TX signals
Amplifying the RX signals from the antenna
4.Power Module of the BTS3900 comprises the PSU and the DCDU, and has the following functions:
The DCDU is a DC power distribution unit and supplies power to each component in a cabinet.
The power supply unit (PSU) is a power conversion module that converts the +24 V DC/220 V AC power to -48 V DC power.
TO WRFU
Clock mode
The optional boards are the UELP, UFLP, UTRP, and UEIU.
Full configuration
Typical configuration
The BBU3900 is an indoor baseband unit. It can be mounted in any standard cabinet with a 19 inch x 2U free space.
Standardized BBU3900 module is a common platform for all BTS portfolio. The mandatory unit for BBU3900 contains the WMPT (main control transmission board), WBBP (baseband processing board), UTRP (extension transmission board) and BBU3900 box. The BBU3900 supports plug-and-play functions and can be configured as required. All of the plugs in unit (PIU) are shared by all BTS type.The BBU3900 features small footprint and easy installation. It provides a wide range of functions and requires low power consumption. In additional, it can be installed conveniently at an existing site.
1.This describes the boards and modules of the BBU3900 in terms of their functions, ports, LEDs, and DIP switches. The mandatory boards and modules are the WMPT, WBBP, UFAN, and UPEU. The optional boards are the UELP, UFLP, UTRP, and UEIU.
2.In full configuration, the BBU3900 has two WMPTs, six WBBPs/UTRPs, two UPEUs, and one UBFA, In typical configuration, it has one WMPT, one WBBP, one UPEU, and one UBFA
available
UFLP
available
UELP
available
available
available
available
WBBP
available
available
available
available
available
available
UTRP
available
available
WMPT
The BBU features a modular-design and can be divided into the following subsystems based on functions: Transmission subsystem, baseband subsystem, controlling subsystem, and power monitoring unit.
When the BBU is fully configured, it involves two WMPTs, six WBBPs or UTRPs, and two power modules. In a typical 3 x 2 configuration, only one WMPT, one WBBP, and one power module are required.
The WMPT board is mandatory for the BBU. A maximum of two WMPT boards can be added for backup. When two WMPTs are configured for mutual backup, the transmission modes of the ports on the boards must also be identical.
The WBBP is mandatory for the BBU. It is used to process the baseband signals. The WBBP supports the connection with the RRU devices only when it is held in slots 02 and 03 of the BBU.
The UTRP is optional. It provides extension transmission interface and can be configured with the UAEC sub-board (ATM and IP protocols supported) and the UPEC sub-board (IP protocols supported).
The UPEA is the power board, which can transform the voltage from -48 V to +12 V; the UPEB is another power board, which can transform the voltage from +24 V to +12 V. Each cabinet can be configured with either of the previous power boards.
The UEIU is the environment interface board of the BBU. The UEIU is used to connect the external monitoring device and transfers the monitoring information to the controlling board. It is mandatory.
mandatory board
4E1:DB26
IP transmission Optical signals: SFP
GPS antenna: SMA
providing the reference clock
upgraded
Providing OM channels
the WCDMA Main Processing and Transmission Unit (WMPT) board. It is a mandatory board of the BBU3900.
2.Main Functions
Providing OM functions such as configuration management, equipment management, performance monitoring, signaling processing
Controlling other boards in the system and providing the reference clock
Providing USB ports, one of which facilitates automatic NodeB upgraded when a USB disk is inserted during software installation and data configuration
Providing one port for four E1s and two FE ports and supporting protocols of ATM and IP
Providing OM channels between the BBU and the LMT or the M2000 to operate and maintain the BBU
Label
Color
Status
Description
RUN
Green
ON
The board has power input, yet the board is faulty.
OFF
1s ON, 1s OFF
0.125s ON, 0.125s OFF
The software is being loaded to the board, or the board is not in use.
ALM
Red
ON
OFF
ACT
Green
ON
OFF
Green
ON
OFF
Green
ON
OFF
There is no data transmission.
The WMPT has another six LEDs indicating the connection status of the FE optical port, FE electrical port, and the Ethernet port. The six LEDs has no silk screen and are on both sides of each of the three ports.
SW2 for setting the protection ground for the E1.
Settings of SW1
2
OFF
ON
3
OFF
ON
4
OFF
ON
The RRING(SW2) must be connected to the protection ground only in 75-ohm E1 unbalanced mode. In this case, all bits of SW2 are set to ON. In other modes, all bits of SW2 are set to OFF.
RRING: R (Receive) RING (External conductor of coaxial cable)
Main Functions
Providing the CPRI interface for communication between the BBU and the
WRRU or WRFU
Processing uplink and downlink baseband signals and support HSUPA and
HSDPA function
According to the board chip processing capability, WBBP module include
seven specifications. Current WBBP is the A version, called WBBPa.
CPRI 0~2 (1.25G-2.5G): SFP
LEDs
This describes the WCDMA Baseband Process unit Type A (WBBPa) board. It is a mandatory board of the BBU3900 that processes baseband signals. A maximum of six WBBPas can be configured for one BBU3900.
The WBBP is recommended to plugging in 2 or 3 slot when realizing the function of interface, because the WBBP in these slots can share all the baseband resources in these slots.The WBBP has 3 CPRI portssupport CPRI 3.0. So 2 WBBPs are needed when BTS3900 and BTS3900A configure more than 3 sectors.
Label
Color
Status
Description
RUN
Green
ON
OFF
1s ON, 1s OFF
0.125s ON/OFF
ACT
Green
ON
OFF
ALM
Red
OFF
ON
The board has alarms on hardware and it should be replaced with a new one.
CPRI0 CPRI1 CPRI2
Blinking at 2 Hz
The RRU on the CPRI link is faulty in hardware.
Blinking at 0.5 Hz
The RRU on the CPRI link is faulty in the antenna system connection.
There are 2 kinds of Baseband card, WBBPa and WBBPb.
The WBBPa support HSDPA (2 ms TTI) and support for HSUPA phase I (10 ms TTI).
The WBBPb support HSDPA (2 ms TTI), and support for HSUPA phase II (2 ms TTI).
Board Type
Phase 2
1.One WBBPa or one WBBPb provides 3 CPRI interfaces. The CPRI supports electrical and optical port.
The electrical interface is provided for connection with WRFU, while the optical interface is provided for connection with RRU.
Notes
The claimed CE based on net capacity in both the UL and the DL.CCH R99 included, per cell reserved 5CE for downlink and 2 CE for uplink, free for operator.
Resources for Compressed Mode included, not require additional CE.Resources for Softer handover included, not require additional CE.
TX diversity is no impact for CE consumption for both uplink and downlink direction.
R99 and HSDPA have separate processing resources. Resources for HS-DSCH, HS-SCCH and HS-DPDCH included, not affect BB capacity for R99 services.
Extra capacity is added by license keys and/or by adding more boards up to maximum capacity. The step of license expansion is 16CEs according to the customer’s requirements.
Main Functions
BBU Module --- UBFA Board
The module is not registered, and no alarm is reported.
1s ON, 1s OFF
Red
ON
The module is reporting alarms.
1. This describes the Universal BBU Fan Unit Type A (UBFA) module. It is the mandatory module of the BBU3900 that controls the fan speed and detects the temperature of the fan board.
2.The UBFA has one LED, indicating the running status of the module. One UBFA is configured per BBU which includes 3 fans
Main Functions
Converting -48 V or +24 V DC power input to +12 V DC power that is supported
by boards
Reporting alarms related to input and output under voltage
Providing transmission ports for RS485 signals and 8 dry contact alarm signals
Panel of the UPEA
Panel of the UPEB
BBU Module --- UPEU Board
-48V to +12V
+24V to +12V
This describes the Universal Power and Environment Interface Unit (UPEU) board. It is a mandatory board of the BBU3900 that converts the DC power from -48 V or +24 V to +12 V
Panel
The UPEU is classified into the UPEA and the UPEB.
The UPEA converts the DC power from -48 V to +12 V
the UPEB converts the DC power from +24 V to +12 V.
All rights reserved
LED: The UPEU has one LED, indicating the running status of the board.
Socket and Port: The UPEU has one socket and four ports.
BBU Module --- UPEU Board
OFF
The board has no power input, or the board is faulty.
Label
Quantity
EXT-ALM0
1
RJ45
MON1
1
RJ45
MON0
1
RJ45
Each UPEU support the 8 dry contact alarm signals. And Two UPEU can support 16.
If more than 8 dry alarm signals, we can use the UEIU.
All rights reserved
The UTRP provides ports for eight E1s/T1s and implements transport such as IP and
ATM between the BBU3900 and the RNC.
BBU Module --- UTRP Board
OFF
1s ON, 1s OFF
0.125s ON, 0.125s OFF
2s ON, 2s OFF
ACT
Green
ON
OFF
ALM
Red
OFF
ON
The board is reporting alarms and is faulty.
1. This describes the Universal Transmission Processing Unit (UTRP) board. It is an optional transmission extension board of the BBU3900.
NOTE:
2. When configured with different sub-boards, the UTRP can provide the following ports:
Ports for eight ATM over E1s/T1s
Ports for eight IP over E1s/T1s
BBU Module --- UTRP Board Type
WCDMA UTRP extend transmission board
UTRP board should add sub board to provide the different interface type.
WD22UTRP is the main board name. The UTRP has three sub-boards in current version
UAEU: Eight ATM over E1s/T1s
UIEU: Eight IP over E1s/T1s
UUAS: One unchannelized ATM over SDH/SONET(STM-1/OC-3) interface
The board in gray table is not be delivered currently.
Board
Port
UTRP2
UTRP3
UTRP4
UTRP6
UTRP9
UAEU : Universal ATM over E1/T1 Interface and Processing Unit.
UIEU :Universal IP Packet over E1/T1 Interface and Processing Unit
Board number: maximum is 1
The UEIU Functions
signals to the WMPT
Connecting to an external alarm device and transmitting dry contact alarm
signals to the WMPT
MON0
RJ45
MON1
RJ45
EXT-ALM0
RJ45
EXT-ALM1
RJ45
This describes the Universal Environment Interface Unit (UEIU) board. It is a mandatory board of the BBU3900 that transmits monitoring signals and alarm signals from external devices to the WMPT.
BBU Module --- SLPU Board
The auxiliary devices of the BBU3900. The devices are the SLPU, UELP, and UFLP
SLPU: The signal lightning protection unit is an optional module of the BTS3900 cabinet (-48 V) or the power distribution cabinet.
The UFLP and the UELP are optional units that are installed in the SLPU.
UFLP
UELP
SLPU: The signal lightning protection unit (SLPU) is an optional module of the BTS3900 cabinet (-48 V) or the power distribution cabinet.
The UFLP and the UELP are optional units that are installed in the SLPU. This describes the auxiliary devices of the BBU3900. The devices are the SLPU, UELP, and UFLP
UELP/UFLP can insert into BBU also can insert to protection box.
UELP boardE1/T1 protection lighting boxsupport 4 channels E1/T1 signal to process the lighting signal.
UFLP boardFE/GE protection lighting boxsupport 2 channels Ethernet signal to process the lighting signal.
If less than 4 E1, one UELP is requiredshould install to BBU slot 4 and 5
If less than 2 FE channelone UFLP is required should install to BBU slot 4 and 5
If more than 4 E1 and less than 8 E1, two UELPs are requiredshould install to BBU slot 4 and 5
If more than 8E1 configurationone SLPU is required the protection lighting box should be installed in SLPU.
All rights reserved
UELP: The universal E1/T1 lightning protection (UELP) unit is a universal E1/T1 The UELP can be optionally installed in the SLPU or the BBU. Each UELP supports the surge protection of 4-way E1/T1 signals.
E1 Connection:
E1
E1
The universal E1/T1 lightning protection (UELP) unit is a universal E1/T1 surge protection unit.
All rights reserved
DIP Switch: The UELP has one DIP switch, which is used to select whether the
receive terminal is grounded. The DIP switch has four bits.
BBU Module --- UELP Board
OFF
OFF
OFF
OFF
Used for other modes except the 75 Ω unbalanced mode
All rights reserved
UFLP: The universal FE lightning protection (UFLP) board is optionally installed in the SLPU or BBU. Each UFLP supports 2-way FE surge protection.
BBU Module --- UFLP Board
RF Module --- WRFU Board
The WRFU consists of the high-speed interface unit, signal processing unit,
power amplifier, and duplex unit
One WCDMA Radio Filter Unit (WRFU) handles a maximum of four carriers.
1.Function
The direct frequency conversion technique, which is directly implemented in the transmit channel, modulates the baseband signals to WCDMA RF signals. After being filtered and amplified, the RF signals are transmitted to the antenna for transmission through the duplex filter. The uplink RF signals received from the antenna go through down-conversion, amplification, analog-to-digital conversion, matched filtering, Automatic Gain Control (AGC). Then, they are sent to the BBU for further processing.
Power control and Voltage Standing Wave Ration (VSWR) detection , Reverse power detection ,Frequency synthesis and loopback test ,Generation of the CPRI clock, recovery of the CPRI clock of lost synchronization, and alarm detection
2. The functions of the high-speed interface unit are as follows:
Transmitting the signals received from the BBU to the signal processing unit
Transmitting the signals received from the signal processing unit to the BBU
The signal processing unit consists of two uplink RX channels and one downlink TX channel.
3.The functions of the uplink RX channels are as follows:
Performing down-conversion of the RF signals to IF signals
Amplifying the IF signals and performing IQ demodulation
Converting analog signals to digital signals
Sampling digital signals
Performing matched filtering
Encapsulating data
4. The functions of the downlink TX channels are as follows:
Encapsulating the clock signals, control signals, and data signals from the BBU and sending them to associated units
Shaping and filtering downlink signals
Converting analog signals to digital signals and modulating IQ
Performing up-conversion of RF signals to the transmit band
5.The power amplifier amplifies the low-power RF signals from the signal processing unit.
Multiplexing the RX signals and TX signals
Enabling RX signals and TX signals to share one antenna channel
Filtering RX signals and TX signals
ANT-RXB
Connecting the BBU, or the upper-level WRFU during the cascading
CPRI1
Interconnection port for RF receive signals
RX-INB
RX-OUTA
Power port
The power input is normal, but the module is faulty.
Off
There is no power input, or the module is faulty.
On for 1 second and off for 1 second
The module is functional.
ALM
On
Off
The module is functional and is connected to the BBU.
Off
The module is in the local test status.
VSWR
On (red)
CPRI0 CPRI1
On (green)
On (red)
The interface module fails to receive signals.
Red LED on for 1 second and off for 1 second
The CPRI link is out of lock.
Each carrier’s maximum output power of WRFU is 80W
The receive sensitivity of single antenna is better than -125.8dBm
The receive sensitivity of two antennas is better than -128.6dBm
The maximum searching ability is 200km
The maximum access search radius is configurable with the step size of 300 m
Configuration Type (No Transmit Diversity)
Transmit Diversity Power (W)/Carrier
Typical Power Consumption (W)
Maximum Power Consumption (W)
20
1020
1330
*1: indicates the receiver sensitivity tested at the top antenna connector with the channel rate of 12.2 kbit/s, BER not exceeding 0.001, and the full frequency according to the proposals stated in 3GPP TS 25.104.
*2: indicates the receiver sensitivity tested at the top antenna connector with the AMR 12.2 kbit/s, BER not exceeding 0.001, and the intermediate frequency.
3. The maximum and typical power consumptions of the BTS3900 in no transmit diversity mode.
In the NxM mode, N refers to the number of sectors and M refers to the number of carriers.
4. Each WRFU include two received channel and one TX channel. Each channel support the four carriers and neighbor 10 M two carriers.
5. If the WRFU support one carrier, the output power is 80W each carrier
6. If the WRFU support two carriers, the output power is 40W each carrier.
7. If the WRFU support four carriers, the output power is 20W each carrier.
Two 40W WRFUs in parallel connection within one sector can support the 1 x 4 configuration.
Two 80W WRFUs in parallel connection within one sector can support the 1 x 8 configuration.
Two WRFUs in parallel connection within one sector can support transmit diversity and 4-way receive diversity.
One 80W WRFU can support 4 continuous carriers in 1 sector and it also can support non continuous carriers (for example 1101, 1011, 1001, 1010, 1100), which can be applicable to RAN sharing with 2 operators has non continuous carriers.
- 48 V DC Distribution
If the external -48 V DC input is used, no additional power system is required. The external -48 V DC input is directly connected to the power input terminals on the DCDU-01. Then, the DCDU-01 distributes the -48 V DC to boards and modules in the cabinet.
When two -48 V DC cabinets are stacked, the external -48 V DC input is directly connected to the power input terminals on the DCDUs-01 in both cabinets. Then, the DCDUs-01 distribute the -48 V DC to the boards and modules in both cabinets
+24 V DC Distribution
If the external +24 V DC input is used, the cabinet is installed with the power subrack (DC/DC). The power subrack (DC/DC) converts the external +24 V DC input into the -48 V DC and supplies the -48 V DC to the DCDU-01. Then, the DCDU-01 distributes the -48 V DC to boards and modules in the cabinet.
The power subrack (DC/DC) converts the external +24 V DC input into the -48 V DC and supplies the -48 V DC to the DCDUs-01 in both cabinets. Then, the DCDUs-01 distribute the -48 V DC to boards and modules in the two cabinets.
220 V AC Distribution
If the external 220 V DC input is used, the cabinet is installed with the power subrack (AC/DC). The power subrack (AC/DC) converts the external 220 V AC input into the -48 V DC and supplies the -48 V DC to the DCDU-01. Then, the DCDU-01 distributes the -48 V DC to boards and modules in the cabinet.
The power subrack (AC/DC) converts the external 220 V AC input into the -48 V DC and supplies the -48 V DC to the DCDUs-01 in both cabinets. Then, the DCDUs-01 distribute the -48 V DC to boards and modules in the two cabinets.
Function
The DCDU-01 supports one -48 V DC power input and ten -48 V DC power outputs
The DCDU-01 supplies power to the BBU, WRFU, FAN, and user devices inside cabinets
The DCDU-01 has the built-in surge protector, which supports the surge protection capability of the differential mode of 10 kA and the common mode of 15 kA
- 48V DC
Single Cabinet
The direct current distribution unit-01 (DCDU-01) module supplies power to each component in the cabinet.
Name
Label
Description
RTN(+)
Power output port
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
RFU0 to RFU5 supplying power to six WRFUs BBU supplying power to the BBU FAN supplying power to the FAN SPARE1 and SPARE2 reserved
Power switch
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
RFU0 to RFU5 controlling the ON/OFF of the current of six WRFUs BBU controlling the ON/OFF of the current of the BBU FAN controlling the ON/OFF of the current of the FAN SPARE1 and SPARE2 controlling the ON/OF of the current on the SPARE1 and SPARE2 power output ports
Alarm output port
+ 24V DC Single Cabinet
Function
Converting +24 V DC power to -48 V DC power and leading the -48 V DC power
to the DCDU
Monitoring alarms related to module faults ,alarms related to module protection
and power out-of-position alarm
(1) Power running LED
(2) Protection LED
(3) Fault LED
The power supply unit (PSU) is a unit for feeding power and converts the +24 V DC power into -48 V DC power.
220V AC Single Cabinet
Function
The power subrack consists of the PMU, PSU (AC/DC) and the wiring unit of the
power subrack (220 V).
The power subrack (AC/DC) converts the 220 V AC power to the -48 V DC power.
(1) Power running LED
(2) Protection LED
(3) Fault LED
The power supply unit (PSU) converts the 220 V AC power into -48 V DC power.
Function
Converting 220 V AC power to -48 V DC power and supplying -48 V DC power for the DCDU
Monitoring 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 out-of-position alarm
Monitoring the information about the charging and discharging of batteries
LED
Color
Status
Meaning
Green
On
Normal
Off
There are faults (such as no AC input, or overvoltage and undervoltage of AC input) on the mains, or the PSU has no output.
Protection LED
Fault LED
Red
Off
Normal, or the PSU has no output because of faults (such as no AC input, or overvoltage and undervoltage of AC input) on the mains.
On
There is no output because of output overvoltage shutdown, fan fault, overtemperature shutdown, remote shutdown, or internal problems of the PSU.
PSU (AC/DC): The power supply unit (PSU) converts the 220 V AC power into -48 V DC power.
220V AC Power Subrack --- PMU Board
The power and environment monitoring unit (PMU) is the unit for monitoring the
power and the environment. The PMU provides perfect power system management,
power distribution detection, and alarm report functions.
(1) LEDs
(3) RS232/RS422 port
Identifier
Color
Status
Meaning
RUN
Green
The module is functional, and the communication with the main control unit is normal.
On for 0.125 second and off for 0.125 second
The module runs normally but the communication with the main control unit fails. If the PMU does not communicate with the main control unit for one minute, the communication fails. In this situation, the RUN LED blinks four times every second.
On/Off
The PMU is faulty (not in the power-on self-check state).
ALM
Red
On
The following alarms are reported: Mains overvoltage or undervoltage alarm Busbar overvoltage or undervoltage alarm Power module alarm Load shutdown alarm
Off
Port
Purpose
Battery control switch
The battery control switch has two control ports ON and OFF, which are used for powering on and off the battery. Press and hold the port ON for 5s to 10s until the battery is powered on. Press and hold the port OFF for 5s to 10s until the battery is powered off. CAUTION: You need to insert a small round bar into the hole when you operate the battery control switch. When you hear a crack, the battery is powered on or off. To operate the battery control switch on the front panel of the PMU, insert a small round pole into the hole.
Power supply test port
Two power supply test holes -48 V and 0 V are available for measuring power voltages through an ordinary multimeter.
COM port
Backplane port
220V AC Power Subrack --- PMU Board
DIP Switch: The DIP switch is located on the rear panel of the PMU. The DIP switch has eight bits, which are set to OFF before delivery.
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
The DIP switch uses the binary method. The four least significant bits (1, 2, 3, and 4) of the DIP switch define the secondary node address of the PMU. The four most significant bits (5, 6, 7, and 8) are not defined, and they are reserved for future use.You can set the monitoring address by setting the four least significant bits of the DIP switch. The first bit corresponds to BIT0, and the fourth bit corresponds to BIT3.
NOTE:
The monitoring address of the PMU can be set to 3 (0011) or 4 (0100). The recommended value is 3.
Value 1 indicates that the bit of the DIP switch is set to ON, and value 0 indicates that the bit of the DIP switch is set to OFF.
FAN Unit
The FAN unit refers to the fan box. The FAN unit provides the functions of ventilation and heat dissipation for cabinets. One FAN unit has four independent fans.
Type
Label
Temperature sensor port
Communication port
COM OUT
RJ45 connector
COM IN
RJ45 connector
Function
Providing forced ventilation and dissipation for the cabinet
Supporting the temperature detection
The FAN unit supports:
Adjustment based on the temperature and adjustment controlled by the main control unit
Fan rotation control function. The FAN unit stops the rotation of the fans when the ambient temperature is low.
Green and yellow
PGND cable of the DCDU
Green and yellow
PGND cable for the SLPU
Green and yellow
Front door PGND cable
2.5 mm^2 for detail please see manuals
There are several different power cable in BTS3900.
Input Power Cable for -48v : blue and black 16mm^2
Input Power Cable (+24 V): Red and black 25mm^2
3.220 V AC threephase power cable: 2.5mm^2
4. 220 VAC singlephase singlewire powercable: 6mm^2
5. 110 V duallive wires: 6mm^2
6. the End with Parallel Terminal: Connected to BBU port on the DCDU-01
7. Connected to PWR port on the UPEU in the BBU
The cables delivered by Huawei to different countries and regions have different colors and specifications.
If the cables are purchased on the local market, they must comply with the local standards.
Power Cable Between the PSU (AC/DC) and the DCDU: blue and black:16mm^2
FE Cable
All rights reserved
Cables --- CPRI Cable
This describes the CPRI electrical cable. It helps to implement high speed communication between the BBU3900 and the WRFU.
Appearance : The CPRI electrical cable is an SFP high speed transmission cable that has a SFP200 male connector at each end.
One End
The BTS3900 supports omni-directional, 2-sector, 3-sector, and 6-sector configurations. It also supports smooth capacity expansion from 1x1 to 3x8.
This part illustrates the configuration type of the BTS3900 by taking the WBBPa supporting three cells and the WRFU supporting the 80W/4 carrier as an example.
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Documents

WCDMA BTS3900 Hardware Structure