HUAWEI BTS3900 Hardware Structure

2008-07
www.huawei.com
HUAWEI Confidential
Security Level: Internal Use
HUAWEI GSM-R BTS3900
Hardware Structure
ISSUE4.0
Wireless Case and Training

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 2
 The BTS3900 developed by Huawei is an indoor macro BTS.
The BTS3900 mainly consists of the BBU and MRFUd.
Compared with traditional BTSs, the BTS3900 features simpler
structureand higher integration.
 In this slide, we’ll mainly introduce the hardware system
structure, basic functions of modules and networking mode of
the BTS3900.

 Know the functions and features of BTS3900
 Master the Hardware structure and function of BTS3900
 Master the Network topologies of BTS3900

 BTS3900 Product Description（V301R013)
 BTS3900 Hardware Description（V301R013)
 BTS3900 Installation Guide（V301R013)

Chapter 1 BTS3900 System Description
Chapter 2 BTS3900 Hardware Structure
Chapter 3 BTS3900 Network Topology

Location
PSTN
ISDN
PSPDN
Um Interface
BTS3900
BTS3900
BTS3900
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAP
TUP,ISUP
MS
MS
MS
MS:Mobile Station BTS:Base TransceiverStation BSC:Base Station Controller
HLR:Home Location Register AUC:Authentication Center EIR:EquipmentIdentity Register
MSC:Mobile Switching Center VLR:VisitorLocation Register SMC:Short MessageCenter
VM:Voice Mailbox OMC: Operation and Maintenance Center DBS：DistributedBase Station

Component
Board/Module Full Name Parts in a Single Cabinet
Full Configuration Minimum Configuration
UEIU Universal Environment Interface Unit ≥3 1
GTMU GSM Transmission and Management
Unit for the BBU
1 1
UBFA Universal BBU Fan unit type A (2U) 1 1
UPEU Universal Power and Environment
interface Unit
2 1
MRFUd Double Radio Filter Unit 6 1
DCDU Direct Current Distribution Unit 1 1
PMU Power and Environment Monitoring Unit 1 0
PSU (AC/DC) Power Supply Unit (AC/DC) 3 0
PSU (DC/DC) Power Supply Unit (DC/DC) 4 0
FAN Box FAN Box 1 1

Section 1 System Structure
Section 2 Hardware Component

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
INDOOR BTS3900 Ver.D
Page 10

BTS3900 Logical Structure

BTS3900 Components
 BTS 3900 Hardware consistsof :
 BBU
 DRFU
 DCDU
 PMU
 PSU
 FAN BOX

BBU Logical Structure

BBU Hardware Structure
 The BBU is a small box with all the external ports on the front panel.
 The BBU3900 boards consist of the UEIU, GTMU, and UELP; the BBU3900
modules consist of the UBFU and the UPEU.

BBU Board--GTMU
 The GSM transmission, timing, and management unit for BBU (GTMU)
controls and manages the entire BTS. It provides interfacesrelated 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--GTMU
 Ports on the Panel
Port Type Description
CPRI0–
CPRI5
SFP
connector
Provides the input and output of optical and electrical transmission
signals
ETH RJ45
connector
Local maintenance and commissioning
FE0 RJ45
connector
A reserved port that performs the following function:
Connects the BBU to a routing device in the equipment room through
the Ethernet cable to transmit network information
FE1 DLC
connector
Connects the BBU to a routing device in the equipment room through
the optical cable to transmit network information
USB USB
connector
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--GTMU
 LEDs on the board
LED Color Status Description
RUN Green On The board is faulty.
Off There is no power supply or the board is
faulty.
Blinking once every two seconds The board is operational.
Blinking once every four seconds The OML link is abnormal.
Blinking four times per second The board is loading software.
ALM Red On A fault occurs in the running board.
Off An alarm is not generated.
ACT Green On The board is operational.
Off The board is faulty.
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.
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.
Label Color Status Description
STATE Green 0.125s ON,
0.125s OFF
The module is not
registered, and no alarm is
reported.
1s ON, 1s OFF The module is running
properly.
Red ON The module is reporting an
alarm.

BBU Module--UPEU
 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

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 monitoringsignals. 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.
Label Conne
ctor
Description
EXT-
ALM1
RJ45 Transmitting eight dry contact
alarms
EXT-
ALM0
RJ45
MON1 RJ45 Transmitting two RS485
environment monitoring
signals
MON0 RJ45

BBU Board—UELP
 The universal E1/T1 lightning protection unit (UELP) provides lightning
protection for four E1/T1 signals.
Port Type Cable Description
INSIDE DB25 male
connector
E1 transfer cable
of the BBU
Transfers the four E1/T1 signals between the
UELP and the GTMU
OUTSIDE DB26 male
connector
E1/T1 cables of
the BBU
Provides the input and output of the four
E1/T1 signals between the BBU and the BSC
 The UELP has one DIP switch, which is used to set the impedance on the
E1/T1 port. There are four DIP bits on the DIP switch.
1 2 3 4
S1 ON ON ON ON Applied to 75-ohm E1 cables in
unbalanced mode.
OFF OFF OFF OFF Applied to other cases instead of 75-ohm
E1 cables in unbalanced mode.

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

MRFUd Logical Structure
 The MRFUd performs modulation and demodulation between baseband
signals and RF signals, processes data, and combines and divides
signals.
 The MRFUd consists of the high-speed interface unit, signal processing
unit, power amplifier, and dual-duplexer.

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Appearance and Interfaces
Page29
Interface type Connectors
type
quantity instruction
RF interface DIN 2 for connecting the antenna
feeder system
RF receipt signal
interconnection interface
QMA female 2 for RF module
interconnection
CPRI interface SFP female 2 for connecting to BBU3900
power interface 3V3 1 -48V power input
monitor interface RJ45 1 monitor and maintenance
CPRI interface capacity：
item quota
CPRI interface quantity 2
CPRI interface rate 1.25Gbit/s or 2.5Gbit/s
supporting CPRI networking
mode
binary star mode

MRFUd Board
 LEDs on the Board
LED Status Meaning
RUN On The power input is normal, but the BBU is faulty.
Off There is no power supply or the module is faulty.
Blinking once every two
seconds
The module is functional.
Blinking four times per second The module is loading software or is not started.
ALM On A fault alarm is generated.
Off No alarm is generated.
ACT On The module is functional and is correctly
connected to the BBU.
Off The connection with the BBU is not established.
seconds
The MRFUd is being tested on the Site
Maintenance Terminal.

MRFUd Board
 LEDs on the Board
LED Status Meaning
VSWR Off (red) No VSWR alarm is detected.
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.
seconds (red)
The CPRI link has a loss-of-lock error.
CPRI1 On (green) The CPRI link is functional.
On (red) The interface module fails to receive signals.
seconds (red)
The CPRI link has a loss-of-lock error.

DCDU Module
 The direction currentdistribution unit (DCDU) provides -48V DC
power of 10 outputs.
 The functions of the DCDU are:
 Receiving -48 V DC power input.
 Distributing the -48 V DC power of 10 outputs for boards and modules in
the cabinet.
 Providing surge protection of 10 kA in differential mode and 15 kA in
common mode and providing dry contact for surge protection failure.

DCDU Module
 Panel of the DCDU (10 outputs)
Name Label Description
Power
input
terminal
NEG(-) DCDU low level input terminal
RTN(+) DCDU high level input terminal
Power
output port
SPARE2, SPARE1, BBU,
FAN, and RFU5-RFU0
Power ports supplying the 10 outputs of power
to the BBU, MRFUd, and fan box
Power
switch
SPARE2, SPARE1, BBU,
FAN, and RFU5-RFU0
Power switch controlling the 10 outputs for the
BBU, MRFUd, and fan box
Alarm
output port
SPD ALM Dry contact alarm output port

PSU Module
 The Power SupplyUnit (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 supplyand 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 (2) Powersupply testports
(3) RS232/RS422ports (4) Battery controlswitch
(5) COM port -
(1) Backplane port (2) DIP switch

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.

PMU Module
 LED on the module
RUN Green 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

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

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.
 Stops the rotation of the fans when the ambient temperature is low.

FAN Box
 Ports on the panel
Type Silk-
Screen
Connector Description
Power port -48 V 3V3 power
connector
Used to introduce the -48 V DC
power
Temperature
sensor port
SENSOR RJ45 connector Used in connection to the
external temperature sensor
Communication
port
COM OUT RJ45 connector Used in connection to the lower-
level cascaded fan box
COM IN RJ45 connector Used in communication with the
central processing unit

FAN Box
 LEDs on the panel
RUN Green 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 Blinking
once every
two
seconds
An alarm is generated.

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.
 MRFUd Topology
 The BBU and MRFUd support multiple network topologies such as star, chain, and
ring topologies.
 Only optical fiber can be used between MRFUd and BBU.

BTS Topology
 The topologies of the BTS are classified into star, chain, tree, and ring
topologies.
 Star mode  Tree mode
 Chain mode  Ring mode

Summary
 BTS3900 Function and Features
 BTS3900 Hardware Structure, such as BBU and MRFUd etc.
 BTS3900 Network Topology

HUAWEI BTS3900 Hardware Structure

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