HUAWEI GSM BTS3900 Hardware Structure-20080728-ISSUE4.0.ppt
53
2008-07 www.huawei.com HUAWEI Confidential Security Level: Internal Use HUAWEI BTS3900 Hardware Structure ISSUE4.0 Wireless Case and Training
Transcript of HUAWEI GSM BTS3900 Hardware Structure-20080728-ISSUE4.0.ppt
PowerPoint PresentationPage *
The BTS3900 developed by Huawei is an indoor macro BTS. The BTS3900 mainly consists of the BBU and DRFUs. Compared with traditional BTSs, the BTS3900 features simpler structure and higher integration.
*
Master the Hardware structure and function of BTS3900
Master the Network topologies of BTS3900
*
*
PSTN ISDN PSPDN
*
Full Configuration
Minimum Configuration
1
1
UEIU
1
1
UELP
0
0
UBFA
1
1
UPEU
2
1
DRFU
1
0
PMU
1
0
*
Weight: 57kg(empty) /142kg(full configuration)
(-48VDC)
(~220VAC)
(+24VDC)
*
BBU
DRFU
DCDU-01
GATM
PMU
PSU
Connects the BTS to the BSC
Exchanges timeslot data between the E1 links and the DBUS
Synchronizes the lower-level clock with the upper-level clock
Central Processing Unit
The central processing unit performs centralized management (OM and signaling processing) of the entire distributed base station system. It also provides the reference clock for the system.
Supports the protocols such as UART and HDLC
Controls the BTS interface unit and communicates with the BSC and BTS
Controls the RF interface unit and communicates with the DRFU
Performs clock module functions in terms of providing and managing BTS clock signals and supporting external synchronization clock input
High-Speed Interface Unit
Receives uplink baseband data from the DRFU
Transmits downlink baseband data to the DRFU
Each BBU3036 supports six CPRI ports
Clock Unit
The clock unit performs the following functions:
Provides high precision clock source for the BTS and provides system clock based on this clock source
Checks the phase-locked state, provides phase lock for the software, provides DA adjustment, and generates frame numbers
Monitoring Unit
The monitoring unit collects various Boolean alarm information, and reports the alarm information to the central processing unit.
HUAWEI TECHNOLOGIES Co., Ltd.
The typical power consumption of the BBU is 50 W.
The BBU is a small box with all the external ports on the front panel.
*
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
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The universal BBU subrack backplane type C (2U) (BSBC) provides backplane interfaces for communication between boards and supplies power for boards.
HUAWEI TECHNOLOGIES Co., Ltd.
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.
*
CPRI0–CPRI5
SFP connector
Provides the input and output of optical and electrical transmission signals
ETH
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
Testing of the output clock signals by using a tester
E1/T1
DB26 male connector
*
There is no power supply or the board is faulty.
Blinking once every two seconds
The board is operational.
ALM
Red
On
Off
ACT
Green
On
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
Red
On
*
OFF
ON
ON
OFF
DIP Switch
DIP Status
OFF
OFF
OFF
OFF
*
OFF
OFF
OFF
OFF
DIP Switch
DIP Status
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
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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.
Label
Color
Status
Description
STATE
Green
The module is not registered, and no alarm is reported.
1s ON, 1s OFF
Red
ON
*
The universal power and environment interface unit (UPEU)
supports the –48V/ +24V DC 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:
Converting -48V or +24V DC to +12V DC that is applicable to the boards.
Providing two RS485 signals and eight dry contact alarms.
Providing reverse connection protection for power cable connectors.
UPEA
UPEB
EXT-ALM1
RJ45
EXT-ALM0
RJ45
MON1
RJ45
MON0
RJ45
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.
EXT-ALM0
RJ45
MON1
RJ45
MON0
RJ45
protection for four E1/T1 signals.
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.
Port
Type
Cable
Description
INSIDE
E1 transfer cable of the BBU
Transfers the four E1/T1 signals between the UELP and the GTMU
OUTSIDE
E1/T1 cables of the BBU
Provides the input and output of the four E1/T1 signals between the BBU and the BSC
DIP Switch
DIP Status
OFF
OFF
OFF
OFF
*
Not required in the BTS3900
1 pcs must be configured in the BTS3900A. The UELP occupies slot 0.
HUAWEI TECHNOLOGIES Co., Ltd.
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.
*
-48VDC power cables
E1 transfer cable
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.
*
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
Signal Processing Unit
The signal processing unit consists of two uplink RX channels and two downlink TX channels.
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
Performing analog-to-digital conversion through the ADC
Sampling digital signals
Performing matched filtering
Encapsulating data
The functions of the downlink TX channels are as follows:
Decapsulating the clock signals, control signals, and data signals from the BBU and sending them to associated units
Shaping and filtering downlink signals
Performing digital-to-analog conversion through the DAC and performing IQ modulation
Performing up-conversion of RF signals to the transmit band
Power Amplifier
The power amplifier amplifies the low-power RF signals from the signal processing unit.
Dual-Duplexer
Multiplexing the RX signals and TX signals
Using one antenna channel to transmit the RX and TX signals
Filtering RX signals and TX signals
HUAWEI TECHNOLOGIES Co., Ltd.
N female connector
ANT2
CPRI0
Used in connection to the BBU, or in connection to the upper-level cascaded DRFU
CPRI1
Port for transmitting RF signals between DRFUs
QMA female connector
RX1 out
RX2 in
RX2 out
Power port
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.
The module is loading software or is not started.
ALM
On
Off
ACT
On
The module is functional and is correctly connected to the BBU.
Off
Blinking once every two seconds
*
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 (red)
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
CPRI1
On (red)
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
*
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
Reports the RET control alarm signals
Monitors the current from the feeder
*
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT1
ANT2
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT3
ANT4
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT5
COM1
COM2
RJ45 connector
Providing the extended RS485 port to be cascaded with other devices
-48 V
*
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
On
Off
Blinking frequently and irregularly
ALM
Red
Off
power of 10 outputs.
The functions of the DCDU-01 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
*
Name
Label
Description
RTN(+)
Power output port
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power ports supplying the 10 outputs of power to the BBU, DRFU, GATM, and fan box
Power switch
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power switch controlling the 10 outputs for the BBU, DRFU, GATM, and fan box
Alarm output port
*
PSU Module
The Power Supply Unit (PSU) converts the ~220V AC or +24V DC
power into the -48V DC power.
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 over-voltage,
no output, and fan faults), alarms related to module protection (such
as over-temperature protection, and input over-voltage/under-voltage
protection), and power failure alarm.
Monitors the charging and discharging of the batteries.
The PSU (DC/DC) has the following functions:
Converts the +24 V DC power into the -48 V DC power.
Monitors alarms related to module faults (such as output over-voltage,
no output, and fan faults), alarms related to module protection (such
as over-temperature protection, and input over-voltage/under-voltage
protection), and power failure alarm.
*
PMU Module
The PMU manages the power supply and batteries. The PMU is
the core of the power monitoring system.
The PMU 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
(3) RS232/RS422 ports
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
Backplane port
*
On for 1s and off for 1s
The module is functional, and the communication with the central processing unit is normal.
On for 0.125s and off for 0.125s
The module is functional, but the communication with the central processing unit fails.
On steady or off steady
The module is faulty if it is not in the power-on self-check state.
ALM
Red
On
The following alarms are generated: Mains overvoltage or undervoltage alarm Busbar overvoltage or undervoltage alarm Overcurrent alarm during charging Battery power-off alarm Battery circle circuit broken alarm Ambient temperature alarm Ambient humidity alarm Water immersion alarm Smoke alarm Power module alarm Load power-off alarm
Off
FAN Box
The fan box regulates the temperature at the air inlet of the cabinet
and in the fan box. It can adjust the rotation speed of the fans to
implement ventilation and dissipation for the cabinet.
The fan box performs the following functions:
Provides forced ventilation and dissipation for the cabinet.
Supports two modes of adjusting the rotation speed of the fans:
adjustment based on the temperature and adjustment controlled by the
central processing unit.
Detects the temperature.
Communicates with the central processing unit to report alarms and the
adjusted rotation speed of the fans based on the temperature to the
central processing unit.
*
Temperature sensor port
Communication port
COM OUT
RJ45 connector
COM IN
RJ45 connector
*
Blinking four times per second
The communication with the central processing unit is not established but the module runs normally.
Blinking once every two seconds
The communication with the central processing unit is established and the module runs normally.
Off
There is no power input and the module is faulty.
ALM
Red
An alarm is generated.
*
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 into account in networking.
*
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.
*
*
BTS3900 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 DRFUs support multiple network topologies such as star, chain, and ring topologies.
*
BTS Topology
The topologies of the BTS are classified into star, chain, tree, and ring topologies.
Star mode
Tree mode
Chain mode
Ring mode
Star Topology
The star topology applies to common areas, especially densely populated areas, such as cities.
Advantages
In the star topology, each site is directly connected to the BSC. It has the following features:
Easy networking
Compared with other topologies, the star topology requires more transmission cables.
Chain Topology
The chain topology applies to sparsely populated areas in strip-like terrain, such as areas along highways and railway tracks.
Advantages
The chain topology reduces cost in transmission equipment, construction, and transmission link lease.
Disadvantages
As signals pass through many nodes, the transmission reliability in the chain topology is reduced.
The faults in the upper-level BTSs may affect the lower-level BTSs.
The number of levels in a chain network should not exceed five.
Tree Topology
The tree topology applies to areas where network structures, site distribution, and subscriber distribution are complicated, for example, an area where large-scale coverage overlaps hot spot or small-scale coverage.
Advantages
The tree topology requires fewer transmission cables compared with the star topology.
Disadvantages
As signals pass through many nodes, the transmission reliability is reduced. This makes it difficult for maintenance and engineering.
The faults in the upper-level BTSs may affect the lower-level BTSs.
Capacity expansion is difficult.
The number of levels in the tree should not exceed five.
Ring Topology
The ring topology applies to common scenarios. Due to its strong self-healing capability, the ring topology is preferred if permitted by the routing.
Advantages
If there is a breaking point in the ring, the ring breaks into two chains at the breaking point automatically. In this way, the BTSs preceding and following the breaking point can work normally despite the breaking point; thus improving the robustness of the system.
Disadvantages
In the ring topology, there is always a link section that does not transfer data.
Thank You
The BTS3900 developed by Huawei is an indoor macro BTS. The BTS3900 mainly consists of the BBU and DRFUs. Compared with traditional BTSs, the BTS3900 features simpler structure and higher integration.
*
Master the Hardware structure and function of BTS3900
Master the Network topologies of BTS3900
*
*
PSTN ISDN PSPDN
*
Full Configuration
Minimum Configuration
1
1
UEIU
1
1
UELP
0
0
UBFA
1
1
UPEU
2
1
DRFU
1
0
PMU
1
0
*
Weight: 57kg(empty) /142kg(full configuration)
(-48VDC)
(~220VAC)
(+24VDC)
*
BBU
DRFU
DCDU-01
GATM
PMU
PSU
Connects the BTS to the BSC
Exchanges timeslot data between the E1 links and the DBUS
Synchronizes the lower-level clock with the upper-level clock
Central Processing Unit
The central processing unit performs centralized management (OM and signaling processing) of the entire distributed base station system. It also provides the reference clock for the system.
Supports the protocols such as UART and HDLC
Controls the BTS interface unit and communicates with the BSC and BTS
Controls the RF interface unit and communicates with the DRFU
Performs clock module functions in terms of providing and managing BTS clock signals and supporting external synchronization clock input
High-Speed Interface Unit
Receives uplink baseband data from the DRFU
Transmits downlink baseband data to the DRFU
Each BBU3036 supports six CPRI ports
Clock Unit
The clock unit performs the following functions:
Provides high precision clock source for the BTS and provides system clock based on this clock source
Checks the phase-locked state, provides phase lock for the software, provides DA adjustment, and generates frame numbers
Monitoring Unit
The monitoring unit collects various Boolean alarm information, and reports the alarm information to the central processing unit.
HUAWEI TECHNOLOGIES Co., Ltd.
The typical power consumption of the BBU is 50 W.
The BBU is a small box with all the external ports on the front panel.
*
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
*
The universal BBU subrack backplane type C (2U) (BSBC) provides backplane interfaces for communication between boards and supplies power for boards.
HUAWEI TECHNOLOGIES Co., Ltd.
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.
*
CPRI0–CPRI5
SFP connector
Provides the input and output of optical and electrical transmission signals
ETH
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
Testing of the output clock signals by using a tester
E1/T1
DB26 male connector
*
There is no power supply or the board is faulty.
Blinking once every two seconds
The board is operational.
ALM
Red
On
Off
ACT
Green
On
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
Red
On
*
OFF
ON
ON
OFF
DIP Switch
DIP Status
OFF
OFF
OFF
OFF
*
OFF
OFF
OFF
OFF
DIP Switch
DIP Status
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
*
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.
Label
Color
Status
Description
STATE
Green
The module is not registered, and no alarm is reported.
1s ON, 1s OFF
Red
ON
*
The universal power and environment interface unit (UPEU)
supports the –48V/ +24V DC 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:
Converting -48V or +24V DC to +12V DC that is applicable to the boards.
Providing two RS485 signals and eight dry contact alarms.
Providing reverse connection protection for power cable connectors.
UPEA
UPEB
EXT-ALM1
RJ45
EXT-ALM0
RJ45
MON1
RJ45
MON0
RJ45
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.
EXT-ALM0
RJ45
MON1
RJ45
MON0
RJ45
protection for four E1/T1 signals.
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.
Port
Type
Cable
Description
INSIDE
E1 transfer cable of the BBU
Transfers the four E1/T1 signals between the UELP and the GTMU
OUTSIDE
E1/T1 cables of the BBU
Provides the input and output of the four E1/T1 signals between the BBU and the BSC
DIP Switch
DIP Status
OFF
OFF
OFF
OFF
*
Not required in the BTS3900
1 pcs must be configured in the BTS3900A. The UELP occupies slot 0.
HUAWEI TECHNOLOGIES Co., Ltd.
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.
*
-48VDC power cables
E1 transfer cable
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.
*
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
Signal Processing Unit
The signal processing unit consists of two uplink RX channels and two downlink TX channels.
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
Performing analog-to-digital conversion through the ADC
Sampling digital signals
Performing matched filtering
Encapsulating data
The functions of the downlink TX channels are as follows:
Decapsulating the clock signals, control signals, and data signals from the BBU and sending them to associated units
Shaping and filtering downlink signals
Performing digital-to-analog conversion through the DAC and performing IQ modulation
Performing up-conversion of RF signals to the transmit band
Power Amplifier
The power amplifier amplifies the low-power RF signals from the signal processing unit.
Dual-Duplexer
Multiplexing the RX signals and TX signals
Using one antenna channel to transmit the RX and TX signals
Filtering RX signals and TX signals
HUAWEI TECHNOLOGIES Co., Ltd.
N female connector
ANT2
CPRI0
Used in connection to the BBU, or in connection to the upper-level cascaded DRFU
CPRI1
Port for transmitting RF signals between DRFUs
QMA female connector
RX1 out
RX2 in
RX2 out
Power port
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.
The module is loading software or is not started.
ALM
On
Off
ACT
On
The module is functional and is correctly connected to the BBU.
Off
Blinking once every two seconds
*
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 (red)
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
CPRI1
On (red)
Blinking once every two seconds (red)
The CPRI link has a loss-of-lock error.
*
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
Reports the RET control alarm signals
Monitors the current from the feeder
*
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT1
ANT2
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT3
ANT4
SMA female connector
Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT5
COM1
COM2
RJ45 connector
Providing the extended RS485 port to be cascaded with other devices
-48 V
*
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
On
Off
Blinking frequently and irregularly
ALM
Red
Off
power of 10 outputs.
The functions of the DCDU-01 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
*
Name
Label
Description
RTN(+)
Power output port
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power ports supplying the 10 outputs of power to the BBU, DRFU, GATM, and fan box
Power switch
SPARE2, SPARE1, BBU, FAN, and RFU5-RFU0
Power switch controlling the 10 outputs for the BBU, DRFU, GATM, and fan box
Alarm output port
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PSU Module
The Power Supply Unit (PSU) converts the ~220V AC or +24V DC
power into the -48V DC power.
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 over-voltage,
no output, and fan faults), alarms related to module protection (such
as over-temperature protection, and input over-voltage/under-voltage
protection), and power failure alarm.
Monitors the charging and discharging of the batteries.
The PSU (DC/DC) has the following functions:
Converts the +24 V DC power into the -48 V DC power.
Monitors alarms related to module faults (such as output over-voltage,
no output, and fan faults), alarms related to module protection (such
as over-temperature protection, and input over-voltage/under-voltage
protection), and power failure alarm.
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PMU Module
The PMU manages the power supply and batteries. The PMU is
the core of the power monitoring system.
The PMU 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
(3) RS232/RS422 ports
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
Backplane port
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On for 1s and off for 1s
The module is functional, and the communication with the central processing unit is normal.
On for 0.125s and off for 0.125s
The module is functional, but the communication with the central processing unit fails.
On steady or off steady
The module is faulty if it is not in the power-on self-check state.
ALM
Red
On
The following alarms are generated: Mains overvoltage or undervoltage alarm Busbar overvoltage or undervoltage alarm Overcurrent alarm during charging Battery power-off alarm Battery circle circuit broken alarm Ambient temperature alarm Ambient humidity alarm Water immersion alarm Smoke alarm Power module alarm Load power-off alarm
Off
FAN Box
The fan box regulates the temperature at the air inlet of the cabinet
and in the fan box. It can adjust the rotation speed of the fans to
implement ventilation and dissipation for the cabinet.
The fan box performs the following functions:
Provides forced ventilation and dissipation for the cabinet.
Supports two modes of adjusting the rotation speed of the fans:
adjustment based on the temperature and adjustment controlled by the
central processing unit.
Detects the temperature.
Communicates with the central processing unit to report alarms and the
adjusted rotation speed of the fans based on the temperature to the
central processing unit.
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Temperature sensor port
Communication port
COM OUT
RJ45 connector
COM IN
RJ45 connector
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Blinking four times per second
The communication with the central processing unit is not established but the module runs normally.
Blinking once every two seconds
The communication with the central processing unit is established and the module runs normally.
Off
There is no power input and the module is faulty.
ALM
Red
An alarm is generated.
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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 into account in networking.
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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.
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BTS3900 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 DRFUs support multiple network topologies such as star, chain, and ring topologies.
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BTS Topology
The topologies of the BTS are classified into star, chain, tree, and ring topologies.
Star mode
Tree mode
Chain mode
Ring mode
Star Topology
The star topology applies to common areas, especially densely populated areas, such as cities.
Advantages
In the star topology, each site is directly connected to the BSC. It has the following features:
Easy networking
Compared with other topologies, the star topology requires more transmission cables.
Chain Topology
The chain topology applies to sparsely populated areas in strip-like terrain, such as areas along highways and railway tracks.
Advantages
The chain topology reduces cost in transmission equipment, construction, and transmission link lease.
Disadvantages
As signals pass through many nodes, the transmission reliability in the chain topology is reduced.
The faults in the upper-level BTSs may affect the lower-level BTSs.
The number of levels in a chain network should not exceed five.
Tree Topology
The tree topology applies to areas where network structures, site distribution, and subscriber distribution are complicated, for example, an area where large-scale coverage overlaps hot spot or small-scale coverage.
Advantages
The tree topology requires fewer transmission cables compared with the star topology.
Disadvantages
As signals pass through many nodes, the transmission reliability is reduced. This makes it difficult for maintenance and engineering.
The faults in the upper-level BTSs may affect the lower-level BTSs.
Capacity expansion is difficult.
The number of levels in the tree should not exceed five.
Ring Topology
The ring topology applies to common scenarios. Due to its strong self-healing capability, the ring topology is preferred if permitted by the routing.
Advantages
If there is a breaking point in the ring, the ring breaks into two chains at the breaking point automatically. In this way, the BTSs preceding and following the breaking point can work normally despite the breaking point; thus improving the robustness of the system.
Disadvantages
In the ring topology, there is always a link section that does not transfer data.
Thank You
