Huawei Gsm Bts3900a Hardware Structure-20080730-B-Issue4.0

2008-05

www.huawei.com

HUAWEI Confidential

Security Level: Internal Use

HUAWEI BTS3900A Hardware Structure

ISSUE4.1

Wireless Case and training

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

The BTS3900A developed by Huawei is an outdoor macro

BTS that performs the same tasks as the BTS3900. The

BTS3900A mainly consists of the BBU and DRFUs. Compared

with traditional BTSs, the BTS3900A features simpler structure

and higher integration.


Know the functions and features of BTS3900A

Master the Hardware structure and function of BTS3900A

Master the Network topologies of BTS3900A


BTS3900A Product Description （ V300R008_02)

BTS3900A Hardware Description （ V300R008_02)

BTS3900A Installation Guide （ V300R008_02)

APM30 User Guide


Chapter 1 BTS3900A System DescriptionChapter 1 BTS3900A System Description

Chapter 2 BTS3900A Hardware Structure

Chapter 3 BTS3900A Network Topology


Location

MS

PSTN ISDN

PSPDN

Um Interface

BTS3900A

BTS3900A

BTS3900A

BTS

OMC

HLR/AUC/EIR

BSC

MSC/VLR

SMC/VM

A Interface

MAP

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


Chapter 1 BTS3900A System Description

Chapter 2 BTS3900A Hardware StructureChapter 2 BTS3900A Hardware Structure

Chapter 3 BTS3900A Network Topology


ComponentBoard/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


Section 1 System Structure

Section 2 PD Cabinet Hardware Component

Section 3 RF Cabinet Hardware Component

Section 4 DRFU Work Mode


BTS3900A CabinetThe 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


BTS3900A Typical Hardware ConfigurationCabinet structure based on the extended

cabinet configuration includes ：6RFU RF cabinet and the APM30 power

distribution cabinet.

3RFU RF cabinet and the APM30 power


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 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

- -


BTS3900A Typical Hardware Configuration Cabinet structure based on the extended



3RFU RF cabinet and the APM30 power


6RFU RF cabinet, APM30 power distribution



(1) Battery (2) RF cabinet (3) Double radio filter unit

(4) Fan module (5) Fan environment monitor



(8) Baseband unit (9) Power distribution unit

(10) EPS4890 (11) APM30 power distribution cabinet

-


BTS3900A Typical Hardware StructureCabinet structure based on the extended


distribution cabinet.3RFU RF cabinet and the APM30 power

distribution cabinet.6RFU RF cabinet, APM30 power distribution



(1) RF cabinet (2) Double radio filter unit (3) Fan module

(4) Fan environment monitor



(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


BTS3900A Local Structure


Power Distribution Cabinet Hardware Components

BBUPower Frame (AC/DC)APMI AFMU PDUGATM ModuleHeaterBatterySensors


BBU Logical Structure


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.


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.


BBU Board--GTMU

The GSM transmission, timing, and management unit for BBU

(GTMU)

controls and manages the entire BTS. It provides interfaces related to

the reference clock, power supply, OM, and external alarm collection. The GTMU performs the following functions:Controls, maintains, and operates the BTS.Supports fault management, configuration management, performance management, and security management.Supports the monitoring of the fan module and power supply module.Distributes and manages BTS3900 clock signals.Provides clock input for testing.Provides port for terminal maintenance.Supports four E1 inputs.Provides CPRI ports for communication with the RF modules .


BBU Board--GTMUPorts 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 through the Ethernet cable to transmit network information

FE1 DLC connector

A reserved port that performs the following function:Connects the BBU to a routing device in the equipment room through the optical cable to transmit network information

USB USB connector

A reserved port that performs the following function:Automatically upgrades the software through the USB disk

TST USB connector

Testing of the output clock signals by using a tester

E1/T1 DB26 male connector

Provides the input and output of the four E1/T1 signals between the GTMU and the UELP or between the GTMU and the BSC.


BBU Board--GTMULEDs on the board

LED Color Status Description

RUN Green On The board is faulty.

Off There is no power supply or the board is faulty.

Blinking once every two seconds The board is operational.

Blinking once every four seconds The OML link is abnormal.

Blinking four times per second The board is loading software.

ALM Red On A fault occurs in the running board.

Off An alarm is not generated.

ACT Green On The board is operational.

Off The board is faulty.

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.


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.


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.


BBU Module--UBFA

The universal BBU fan unit type A (2U) (UBFA) communicates with

the

GTMU to regulate the temperature, adjust the fan speed, and report

alarms. The UBFA module is hot swappable.

LED Color Status Description

STATE Green Blinking twice per second

The board is not securely connected. An alarm is not generated.

Red On An alarm is generated.

Green Blinking once every two seconds

The board operates normally.


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.


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


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.


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


BBU Board--UELPThe universal E1/T1 lightning protection unit (UELP) provides lightning

protection for four E1/T1 signals.

Port Type Cable Description

INSIDE DB25 male connector

E1 transfer cable of the BBU

Transfers the four E1/T1 signals between the UELP and the GTMU

OUTSIDE DB26 male connector

E1/T1 cables of the BBU

Provides the input and output of the four E1/T1 signals between the BBU and the BSC

The UELP has one DIP switch, which is used to set the impedance on the

E1/T1 port. There are four DIP bits on the DIP switch. DIP Switch DIP Status Description

1 2 3 4

S1 ON ON ON ON The E1 impedance is set to 75 ohms. The E1 is grounded (unbalanced mode).

OFF OFF OFF OFF Other modes


BBU Cable connection

The BBU3900 cables are classified into the PGND cable, -48VDC

power cable, E1/T1 cable, E1 transfer cable, environment monitoring

signal cable, CPRI signal cable between the BBU and the RRU, and

BBU monitoring signal cable. The cable connection relations of the BBU are as follows:


BBU Cables

The cables figure of the BBU

-48VDC power cables E1 transfer cable

FE cable CPRI optical cable


BBU Cables The cables figure of the BBU

(1)RJ45 Connector (2) Cord end terminal

Monitoring signal cable between the APM and the BBU


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.


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


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.


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 alarmBusbar over-voltage or unde-rvoltage alarmBattery charging over-current alarmBattery shutdown alarmBatteries loop failure alarmAmbient temperature alarmAmbient humidity alarmWater damage alarmSmoke alarmPower module alarmLoad shutdown alarm

Off No alarm is generated.


Power Subrack (AC/DC)—PMU Module DIP Switch

Bit 3 Bit 2 Bit 1 Bit 0 Monitoring Address

0 0 0 0 0000

0 0 0 1 0001

0 0 1 0 0010

0 0 1 1 0011

0 1 0 0 0100

0 1 0 1 0101

0 1 1 0 0110

0 1 1 1 0111

1 0 0 0 1000

1 0 0 1 1001

1 0 1 0 1010

1 0 1 1 1011

1 1 0 0 1100

1 1 0 1 1101

1 1 1 0 1110

1 1 1 1 1111


Power Subrack (AC/DC)—PSU ModuleThe PSU (AC/DC) has the following functions:

Converts the 220 V AC power into the -48 V DC powerMonitors 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 alarmMonitors the charging and discharging of the batteries

LED Color Status Meaning

Power input LED (top)

Green On Normal.

Off There is no AC power input or the fuse is damaged.

Power protection LED (middle)

Yellow Off Normal.

On Power protection for the PSU is being triggered, for example, upon input undervoltage/overvoltage or overtemperature.

Power failure LED (bottom)

Red Off Normal.

On Irrecoverable fault occurs inside the PSU. For example, the fault can be output overvoltage, no outputs, or fan fault.


Power Subrack (AC/DC)—Wiring UnitThe 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 BoardThe 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 BoardPort on the panel

Port Connector Type Quantity Function

RS422 RJ45 connector 1 Connecting the monitoring signal cable between the PMU and the APMI

TX+, TX-, RX+, RX-

2-pin molex connector 2 Connecting the monitoring signal cable between the APMI and the BBU

IN1-IN3 2-pin molex connector 3 Connecting the dry contact alarm input cable

OUT1 2-pin molex connector 1 Connecting the optical coupling alarm output cable


AFMU BoardThe 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 BoardPorts and LED on the Panel

SN Port Function

1 ALM Connecting the monitoring signal cable between the AFMU and

the APMI

2 DC INPUT

Connecting the DC power cable of the AFMU

LED Silkscreen Color Status Description

Operation LED

RUN Green ON steady About 1 minute after the AC or DC power-on

Blinking for 1s ON and 1s OFF

The system is working properly.

Blinking for 0.125s ON and 0.125s OFF

The serial port communication is disrupted. The other communication is normal.

OFF steady The system is not powered on.

Alarm LED ALM Red ON steady An alarm is generated.

OFF steady No alarm is generated, or the system is not powered on.


PDU ModuleThe PDU (short for Power Distribution Unit) performs AC or DC power

distribution.The AC distribution functions of the PDU are as follows:

Supplies two AC power outputs with the maximum current of 10 A to the

heaters

of the power cabinet and the heating film of the battery cabinet. Reports the surge protection alarms of the AC input power .

The DC distribution functions of the PDU are as follows:Provides 10 DC power outputs to meet the DC power requirements of t

he distributed base station or the separated base station Reports the surge protection alarms of the DC output power


PDU ModuleThe port on the panel

SN Description

1 AC wiring terminals•For the 110 V dual-live-wire input, use L2 •For the single-phase 220 V/three-phase 220 V input, use N1 and N2

2 AC wiring terminals•For the 110 V dual-live-wire input, use L1 •For the single-phase 220 V/three-phase 220 V input, use L1, L2 and L3

3 AC output wiring terminals (Lout1, Lout2)

4 AC output wiring terminals (Nout1, Nout2)

5 AC input MCB

6 AC output MCB (controls the power supply to the heating film or heaters)

7 DC output MCBs (SW0-SW9)

8 DC output wiring terminals (LOAD0-LOAD9)


GATM ModuleThe 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


GATM ModulePorts on the panel

Ports Connector Function

ANT0 SMA female connector

Providing power for the RET antenna and transmitting control signals for the RET antenna


Providing power for the antenna









COM1 RJ45 connector Used in connection to the BBU

COM2 RJ45 connector Providing the extended RS485 port to be cascaded with other devices

-48 V 7W2 power connector

Receiving the -48 V power input


GATM ModuleLEDs 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.


HeaterThe 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.


BatteryThe power cabinet can house 1 to 3 groups of -48 V 12 AH batteries,

which can form the -48 V 12 AH battery group system, the -48 V 24 AH

system, or the -48 V 36 AH system. The details are as follows:The -48 V 12 AH or -48 V 24 AH battery group is installed in the 3 U space

at the bottom, and the remaining 5 U space can be used to install the user

devices.

The -48 V 36 AH battery group is installed

in the 6 U space at the bottom, and the

remaining 2 U space can be used to install

the user devices.


Sensors Door Status Sensor

The door status sensor is made up of two parts, the magnet part and the switch part.


Sensors Temperature Sensor

The temperature sensors of the APM30 consist of the air inlet temperature

sensor, internal ambient temperature sensor, and the air outlet temperature sensor.


RF Cabinet Hardware ComponentsDRFUDCDU-02FAN Unit FMUABatteryDoor Sensor


DRFU Logical StructureThe 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 Ports on the panel

Type Connector Ports Description

Port for transceiving RF signals

N female connector ANT1 Used in connection to the antenna subsystemANT2

CPRI port SFP female connector

CPRI0 Used in connection to the BBU, or in connection to the upper-level cascaded DRFU

CPRI1 Used in connection to the lower-level cascaded DRFU

Port for transmitting RF signals between DRFUs

QMA female connector

RX1 in Input port for diversity signals in antenna channel 1

RX1 out Output port of diversity signals in antenna channel 1

RX2 in Input port for diversity signals in antenna channel 2

RX2 out Output port of diversity signals in antenna channel 2

Power port 7W2 power connector

PWR Receives power input


DRFU BoardLEDs on the Board

LED Status Meaning

RUN On The power input is normal, but the BBU is faulty.

Off There is no power supply or the module is faulty.


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.


The DRFU is being tested on the Site Maintenance Terminal.


DRFU BoardLEDs on the Board

LED Status Meaning

VSWR Off (red) No VSWR alarm is detected.

Blinking once every two seconds (red)

The VSWR alarm is generated on only the ANT2 port.

Blinking four times per second (red)

The VSWR alarms are generated on the ANT1 and ANT2 ports.

On (red) The VSWR alarm is generated on only the ANT1 port.

CPRI0 On (green) The CPRI link is functional.

On (red) The interface module fails to receive signals.


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.


The CPRI link has a loss-of-lock error.


DCDU-02 ModuleThe direction current distribution unit (DCDU)

provides

-48 V DC power (four outputs).

Functions of the DCDU:Receiving -48 V DC power inputProviding -48 V DC power for boards and modules in the cabinetProviding 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 Ports on the Panel

Item Label Description

Power input terminal

NEG(-) DCDU low level input terminal

RTN(+) DCDU high level input terminal

Power switch

RFU0-RFU5, FMUA, and Spare

RFU0-RFU2 control the DC outputs to three DRFUs on the left of the 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 ModuleThe 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.

InterfaceThere 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 BoardThe FMUA (Fan Environment Monitor) is a fan environment monitoring unit.The FMUA performs the following functions:

Leading -48 V DC power supply to the cabinet and supplying -48 V DC power supply for the fan module.Collecting environment alarm information in the cabinet. The environment alarm is classified into temperature alarm, humidity alarm, smoke alarm, water immersion alarm, and door status alarm.Collecting surge protection alarm information of the DC power distribution unit.Monitoring the operating status of fans. Supporting two modes of adjusting the rotation speed of the fans: adjustment based on the temperature and adjustment controlled by the main control unit.Controlling the fan rotation. Stopping the rotation of the fans when the ambient temperature is low.Supporting the detection and reporting of the temperature.Supporting the cascading and extension of RS485 ports. FMUAs can be cascaded.


FMUA Board LED on the board

LED Color Description Status Description

RUN Green Indicates the running status of the board


The board is running normally and the communication with the BBU is normal.


There is power supply but the communication with the BBU is abnormal.

Off No power input is available.

ALARM

Red Indicates whether there are alarms


There are alarms from both the fans on the left and right half subracks.


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 BoardPorts on the

panelType Ports Connector Description

Power port -48 V 7W2 power connector –48 V DC power input

RS485 port COM IN RJ45 connector Used in connection to the BBU or the monitoring port on the upper-level FMUA

COM OUT RJ45 connector Used in connection to the lower-level FMUA

TEM RJ45 connector Cabinet temperature monitoring port

TEM_HUM ARRESTER

RJ45 connector Used in connection to the surge protection failure alarm port of the power distribution unit

Fan port FAN0 4-pin connector Used in connection to the fan module on the left half subrackFAN1

FAN2 4-pin connector Used in connection to the fan module on the right half subrackFAN3

Boolean port

The first group (from left to right)

Dry contact connectors Extended Boolean ports

The second group Dry contact connectors

The third group Dry contact connectors Smoke sensor port, door status sensor port

The fourth group Dry contact connectors Water sensor ports


Batteries in the RF Cabinet

The batteries in the 3RFU cabinet serve as the power backup for the

BTS.The -12 V 50 Ah battery or -12 V 92 Ah battery is allowed in the 3RFU

cabinet. The battery combination is as follows:When the -12 V 50 Ah battery is used, four batteries in serial connection can

be configured to serve as the power backup of -48 V 50 Ah. When the -12 V 92 Ah battery is used, four batteries in serial connection can

be configured to serve as the power backup of -48 V 92 Ah.

(1) -12 V 50 Ah battery (2) -12 V 92 Ah battery


Door Status Sensor in the RF Cabinet The door status sensor detects the opening and closing of the cabinet

door.


BTS3900A Configuration Principles 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.

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

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 Structure2 TRXs and 2 duplexers are integrated in DRFU module which can be

connected to antenna directly.The RX_IN/OUT port of DRFU can support the receiving signal

interconnection between 2 DRFUs, so that it can support the diversity

receiving between 2DRFUs.


DRFU Antenna ModeSingle antenna, double receivers

The DRFU module has 1 working TX/RX feeder and 2 way receive diversity, one

of the receiver is from the another DRFU.

Double antennasThe DRFU module has 2 working TX/RX feeders and 2 way receive diversity.

Double antennas, 4 receiversThe DRFU has 2 working TX/RX feeders and 4 way receive diversity.


DRFU Transmit and Receive Mode DRFU transmit mode

Transmit independency or combining

PBT

Transmit diversity

DRFU receive mode Two way receive diversity

Four way receive diversity


DRFU Transmit Mode--Transmit Independency or Combining Transmit Independency

Transmit Combining

Interface Processing U

nit

DUP

DUP

CPRI0

CPRI1

ANT1

ANT2


nit

DUP

DUP

CPRI0

CPRI1

ANT1

ANT2


DRFU Transmit Mode--PBT

In PBT mode, only the first TRX can work.

PBT mode can improve the transmitting power.

In PBT mode ， only channel A is used by downlink signal.


nit

DUP

DUP

CPRI0

CPRI1

ANT1

ANT2


DRFU Transmit Mode--Transmit Diversity

In this mode, only the first TRX can work

Transmit diversity mode improves the quality of downlink signal

In this mode ， the signal from the first TRX is divided into 2 channels and be

transmitted through channel A and channel B.


nit

DUP

DUP

CPRI0

CPRI1

ANT1

ANT2


DRFU Receive Mode-- Two Way Receive Diversity In this mode ， both of the 2 TRXs can work

Each TRX receives the signal from 2 feeders

In the following figure ， the TRX gets the receiving signal from channel A

and B of the single DRFU, It is also possible for TRX to use the channel A

receiver of another DRFU.

CPRI0

CPRI1


nit

DUP

DUP

ANT1

ANT2

RX-IN

RX_OUT

From RX-in, TRX can also use the channel A of the other DRFU, so

channel B of the two DRFUs are canceled


DRFU Receive Mode-- Four Way Receive Diversity In this mode, only the first TRX can work

The working TRX gets the uplink signal from 4 feeders of 2 DRFUs

CPRI0

CPRI1

CPRI0

CPRI1

Interface P

rocessing

DUP

ANT1

ANT2

RX-IN

RX_OUTInterface P

rocessing

DUP

ANT1

ANT2

RX-IN

RX_OUT

2 channels from the other

DRFU


Chapter 1 BTS3900A System Description

Chapter 2 BTS3900A Hardware Structure

Chapter 3 BTS3900A network TopologyChapter 3 BTS3900A network Topology


BTS3900A Topology BTS Topology

The topologies of the BTS are classified into star, chain, tree, and ring topologies.

E1/T1 cable can be used between BBU and BSC or transmission equipment,

Optical and LAN cable can be used between BBU and route equipment.

DRFU Topology The BBU and 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

topologies. Star mode Tree mode

Chain mode Ring mode


DRFU Topology The BBU and DRFUs support multiple network topologies such as star, chain, and ring topologies.


Summary

BTS3900A Function and Features

BTS3900A Hardware Structure ， such as BBU and DRFU etc.

BTS3900A Network Topology

Thank You

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Huawei Gsm Bts3900a Hardware Structure-20080730-B-Issue4.0

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