Huawei DBS3900 Hardware Structure Guide

2008-03
www.huawei.com
HUAWEIConfidential
Security Level: Internal Use
HUAWEI GSM DBS3900
Hardware Structure

HUAWEITECHNOLOGIES Co., Ltd. HUAWEIConfidential
DBS3900 is a distributed BTS solution developed by Huawei
Technologies Co.,Ltd. Its baseband part and radio part can be
installed independently so that it can be used to various
environments with wide coverage and low cost.

 Know the functions and features of DBS3900
 Master the Hardware structure and function of DBS3900
 Familiar with the Typical configuration and cable
connection of DBS3900
 Master the Network topologies of DBS3900

 DBS3900 Electronic Documentation
 BBU3900 Quick Installation Guide
 RRU3004 Quick Installation Guide
 DBS3900 Deployment Guide

Chapter 1 DBS3900 System DescriptionChapter 1 DBS3900 System Description
Chapter 2 DBS3900 Hardware Structure
Chapter 3 DBS3900 Typical Configuration
Chapter 4 DBS3900 Network Topologies

Location
PSTN
ISDN
PSPDN
Um Interface
DBS3900
DBS3900
DBS3900
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAP
M
AP
TUP,ISUPMS
MS
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

Functions and Features
 Wide coverage, low cost
 Suitable for various environments, flexible installation
 Support PGSM900M 、 EGSM900 、 DCS1800M
 One RRU module can support 2 TRXs
 Support transmit diversity
 Support PBT
 Support four-way receive diversity over different RRU
 BBU support star, tree, chain and ring topology
 Calculate TA exactly
 Support GPRS and EGPRS

Functions and Features
 Support Omni-directional coverage and directional coverage
 One BBU can support 36TRX at most and 12 cells at most
 Support A5/3, A5/2, A5/1 encryption and decryption
 Support dynamic radio frequency management
 Cell broadcasting service and point-to-point short message
 Support mixed combining with BTS3012
 Support -48VDC power input

Chapter 1 DBS3900 System Description
Chapter 2 DBS3900 Hardware StructureChapter 2 DBS3900 Hardware Structure

Abbreviation
RRU Remote Radio unit
BBU Base Band unit
GTMU Transmission& Timing& Management Unit for BBU
UPEA
Universal power and Environment interface unit
Type A (-48v)
BSBC Universal BBU Subrack Backplane Type C (2U)
UBFA Universal BBU Fan Unit Type A (2U)
UEIU Universal Environment Interface unit
UELP Universal E1/T1 Lighting Protection unit
UFLP Universal FE/GE Lighting Protection unit
CPRI Common Protocol Radio Interface
APM Advanced Power Module
IBBS Integrated Backup Battery System
OFB Outdoor Facility Box

Sector 1 DBS3900 Hardware ComponentsSector 1 DBS3900 Hardware Components
Sector 2 BBU3900 System Structure
Sector 3 RRU3004 System Structure
Sector 4 DBS3900 Typical Scenario

DBS3900
 The DBS3900 consists of the BBU3900 and the RRU3004.
 The BBU3900 is an indoor baseband unit. It provides physical interfaces for
connection with the BSC and RRU. It performs centralized management (OM
and signaling processing) of the entire base station system and provides
reference clock for the system.
 The RRU3004 is an outdoor remote RF unit. It processes baseband signals
and RF signals.
 The Local Maintenance Terminal (LMT) and Man-Machine Interactive (MMI)
can implement the maintenance of the DBS3900 through the BBU3900.
BBU3900
RRU3004 RRU3004 RRU3004

APM30 Overview
 The APM30 provides –48 V DC power
and power backup for the distributed
base stations and mini base stations,
and provides space for the user
equipment. It also performs functions
such as battery management and
monitoring, and lightning protection.
1. Filler panel(1U)
2. Power sub-rack (3 U)
3. DC PDU(2U)
4~8. Filler Panel(1U)
9. Space for batteries (3U)

OFB Overview
 OFB (Outdoor Facility Box)
supports DC power input
and DC power distribution
and can serve as a cabinet
for the transmission
equipment, provides 11U
installation space.
 Since it has no heating
system, the OFB is unable
to adapt to low-temperature
environment. The OFB is
applicable to category C
environment.

IBBS Overview
 As an auxiliary product for Huawei outdoor BTSs, the
Integrated Backup Battery System (IBBS) provides
backup power to meet the requirements for fast network
deployment.
 Output: -48V DC.
 Backup power mode: serial or parallel connection
between batteries.
 Operating temperature: The IBBS cabinet is functioning
normally when the temperature is +55°C.
 Alarm system: It provide door control, smog and
temperature sensors.
 A maximum of 16 batteries of 12 V 100 Ah or 2 V 150
Ah, four batteries in one group and four groups in the
IBBS cabinet.

Sector 1 DBS3900 Hardware Components
Sector 2 BBU3900 System StructureSector 2 BBU3900 System Structure

BBU3900
 The BBU3900 is an indoor BTS control unit that enables interaction
between the BTS and the BSC.
 The BBU3900 performs the following functions:
 Provides physical interfaces between the BTS and the BSC for
interaction.
 Provides CPRI ports for communication with the RRU3004.
 Provides the USB port for downloading the BTS software.
 Provides OM channels for connection to the LMT (or M2000).
 Processes UL and DL data.
 Provides centralized management on the entire DBS system, such as
OM and signaling processing.
 Provides the reference clock for the entire system.

Logical Structure of the BBU3900

Hardware Components of BBU3900
 The typical power consumption of the BBU is 35 W.
 The weight of the BBU isn’t more than 12KG.
 Each BBU3900 supports a maximum of 36 TRXs, and 12 cells.
 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.

BSBC Board
 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 as common slots.

GTMU Board
 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
 Monitors the fan module and the power supply module
 Distributes and manages BTS clock signals
 Provides clock input for testing
 Provides the Ethernet port for terminal maintenance
 Supports four E1 inputs
 Provides the CPRI ports for communication with the RRU

GTMU Board
 Ports on the GTMU Panel
Port Type Cable Description
CPRI0–
CPRI5
DLC
connector
CPRI optical cable
between the BBU
and the RRU
Provides the input and output of the optical signals
ETH RJ45
connector
Crossover cable
(delivered with the
equipment)
Performs 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
- Tests the output clock signals with a tester
E1/T1 DB26 male
connector
E1/T1 cable of the
BBU
Provides the input and output of the four E1/T1 signals
between the GTMU and the UELP or between the GTMU and
the BSC

GTMU Board
 LEDs on the GTMU Panel
LED Color Status Description
RUN Green On The board is faulty.
Off There is no power supply or the board is faulty.
Blinking once/2s The board is operational.
Blinking once/4s The OML link is abnormal.
Blinking four
times/s
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/s
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 triggered.

GTMU Board
 DIP Switch of GTMU
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
1 2 3 4
SW2 ON ON ON ON The E1 cable
is grounded.
OFF OFF OFF OFF The E1 cable
is not
grounded.
DIP
switch
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.
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
bypassed.
OFF OFF ON OFF The E1 link of the Level
bypassed.
ON ON OFF OFF The E1 link of the Level
bypassed.
OFF ON OFF OFF The E1 link of the Level
bypassed.

UBFA Module
 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.

UPEU Module
 The universal power and environment interface unit type A (–48 V) (UPEU)
supports the –48 V DC power input, supplies power to the boards, modules,
and fan in the BBU, and provides access to multiple environment monitoring
signals. Port Type Description
MON0 RJ45
Connector
Provides the input and output of the
externally collected environment
monitoring signals to the GTMU
according to the RS485 communications
protocol
MON1 RJ45
Connector
Reserved
EXT-
ALM0
RJ45
Connector
Transmits the externally collected
environment monitoring signals to the
GTMU through communications protocol
related to the dry contact
EXT-
ALM1
RJ45
Connector
Reserved
PWR 3V3Power
Connector
–48V power input

UEIU Board
 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.
Port Type Description
MON0 RJ45
Connector
Provides the input and output of the
externally collected environment
monitoring signals to the GTMU
according to the RS485
communications protocol
MON1 RJ45
Connector
Reserved
EXT-
ALM0
RJ45
Connector
Transmits the externally collected
environment monitoring signals to the
GTMU through communications
protocol related to the dry contact
EXT-
ALM1
RJ45
Connector
Reserved

UELP Board
 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 DB26male connector 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 Description
1 2 3 4
SW1 OFF OFF OFF OFF Twisted-pair cable （ 100Ω T1 or 120Ω E1 ）
ON OFF ON OFF Coaxial cable （ 75Ω E1 ）
 UELP Board provides a DIP switch to set impedance of E1/T1.

BBU Cables
 The BBU3900 cables are classified into the PGND cable, –48 V DC
power cable, E1/T1 cable, E1 transfer cable, RS485 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 as following:

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 OFB and the BBU
Monitoring signal cable between the APM and the BBU
(1)RJ45
Connector
(2) Cord end
terminal
(3)OT
Connector
(4)Common
3PIN
Connector

Sector 3 RRU3004 System StructureSector 3 RRU3004 System Structure

RRU3004
 The RRU3004 is an outdoor remote RF unit.
 The functions of the RRU3004 are as follows:
 The direct IQ modulation technique, which is directly implemented in the transmit
channel, modulates the baseband signals into GSM RF signals. After being filtered
and amplified, the RF signals are transmitted to the antenna for transmission,
through the duplexer in the RF front-end unit.
 The uplink RF signals received from the antenna go through down-conversion,
amplification, analog-to-digital conversion, matched filtering, Automatic Gain
Control (AGC), and then are sent to ASIC and DSP for demodulation and
decoding.
 Power regulation and Voltage Standing Wave Ration (VSWR) detection.
 Frequency synthesization and loopback test.
 Generation and recovery of the clock circuitry at the CPRI interface, and the alarm
detection.

Logical Structure of the RRU
RXM_OUT:RRU RX main output for RRU
cascading
RXD_IN:RRU RX diversity input for RRU
cascading

Components of the RRU3004
 An RRU3004 consists of two RRU modules.
 The RRU module has a modular structure. The external interfaces of the RRU
module are located at the bottom of the module and in the cabling cavity.
 The weight of RRU3004 is 38Kg. The RRU3004 can be installed on a wall,
stand, metal pole, or tower.

RRU Module
 The RRU module has a bottom panel, a cabling cavity panel, and an
area attached with LEDs.
 Provides - 48VDC power supply.
1 Bottom panel
2 Cabling cavity panel
3 LEDs

RRU Module
 Ports of the RRU Module
Item Label Description
Bottom panel RX_IN/OUT Interconnection ports for RF signals
RET RET antenna port
ANT_TX/RXA RF TX/RX port A
ANT_TX/RXB RF TX/RX port B
Cabling cavity
panel
RTN+ Power wire post
NEG-
TX RX CPRI_E Eastern optical port
TX RX CPRI_W Western optical port
EXT_ALM Alarm Port
RST Hardware reset button
TST VSWR Test button for VSWR alarms
TST CPRI Test button for the CPRI port

RRU Module
 LEDs on the RRU Module
LED Status Meaning
RUN On The board is faulty.
Off No power input is available.
Blinking once every two seconds The board is operational.
ALM On (blinking at high frequency) There is a fault related to the running board.
Off No alarm is detected.
ACT On Normal operation
Off The connection with the BBU is not established.
Blinking once every two seconds Only one logical transceiver is functional (including TRX mutual aid is
implemented).
Blinking twice per second Local test status
VSWR TX_ACT On (green) No VSWR alarm is detected.
Blinking once every two seconds (green) The board is operational.
Blinking once every two seconds (red) A VSWR alarm is detected at the ANT_TX/RXA port.
Blinking once per second (red) A VSWR alarm is detected at the ANT_TX/RXB port.
On (red) A VSWR alarm is detected at the ANT_TX/RXA and ANT_TX/RXB ports.
OPTW/E(westwar
d/eastward CPRI
LED )
On (green) The CPRI link is functional.
On (red) The reception of the optical module is abnormal and an alarm is
triggered.
Blinking once every two seconds (red) The CPRI link is out of lock.
Off The SFP module is out-of-position or the optical module is powered off.

Connections of RRU Cables
 The RRU3004 has the following cables: PGND cable, power cable,
AISG multi-wire cable, AISG extension cable, CPRI optical cable, RF
jumpers, Boolean input cable, and cables for cascaded RRUs.

 The related cable’s figure of the RRU
RRU –48 V DC power cable RRU Power cable for cascaded RRU modules
Signal cable between the electrical
ports on cascaded RRU modules
CPRI optical cable

 The related cable’s figure of the RRU
Cascaded RF jumper Boolean input cable
AISG multi-wire cable AISG extension cable

Sector 4 DBS3900 Typical ScenarioSector 4 DBS3900 Typical Scenario

Typical Scenarios of the DBS3900
 Scenario 1: BBU+RRU+APM+IBBS
 When the site provides only the AC power supply and a long-time backup power
supply is required, the installation scenario can be used.
 The BBU can be installed in the APM. The APM supplies -48 V DC power to the BBU and
RRU.
 The IBBS can supply backup power to the BTS for a long time to ensure that the BTS still
operates normally in the case of an AC power supply failure.
 The RRU can be installed on a stand, pole, wall, or tower.

 Scenario 2: BBU+RRU+APM+OFB
 When the site provides the AC power supply and the space in the APM is
insufficient, the installation scenario can be used.
 The OFB provides 5 U to 11 U transmission space in which transmission equipment or
batteries can be installed.
 The BBU can be configured in the APM. The APM supplies –48 V DC power to the BBU
and RRU and also provides backup DC power.

 Scenario 3: BBU+RRU+OFB
 When there is no equipment room on site, the DC power supply is available, and
the backup power supply is not required, the installation scenario can be used.
 The BBU is installed in the OFB. The OFB supplies –48 V DC power to the BBU and
RRU.

Chapter 3 DBS3900 Typical ConfigurationChapter 3 DBS3900 Typical Configuration

Sector 1 RRU Work Mode IntroductionSector 1 RRU Work Mode Introduction
Sector 2 RRU Typical Configuration

Internal Principle of the RRU
 RRU consists of two TRXs and two duplexers, and the RRU can be
connected to the antenna directly.
 The RF jumper between cascaded RRU modules is used to connect the
RX_IN/OUT ports of two RRU modules so that receiving diversity signals
can be transmitted between the two RRU modules.

The Antenna Configuration of the RRU
 Single antenna
 There is no receiving diversity or transmitting diversity.
 Single antenna and double receivers
 The RRU module has one TX/RX feeder and two way receiving diversities, one of
the receiver is from the another RRU module of the RRU3004.
 Double antennas
 The RRU module has two TX/RX feeders and two way receiving diversities.
 Double antennas and four receivers
 Each RRU can have two TX/RX feeders, and two RRUs are combined to support
four way receive diversity.

RRU Power Mode
 M900 RRU
 Optional value: “30W”,“25W”,“15W”,“12W”.
 Default value: “15W”, RRU supports transmit combining or independency here,
otherwise RRU supports transmit independency only.
 M1800 RRU
 Optional value :”20W”, “10W”.
 Default value: “10W”, RRU supports transmit combining or independency here,
otherwise RRU supports transmit independency only.

RRU Transmit Mode and Receive Mode
 RRU transmit mode
 Transmit combining or independency
 PBT
 Transmit diversity
 RRU receive mode
 Receive diversity
 Four way receive diversity

Cell Configuration of Single RRU
 S1
 Configure only one TRX in one RRU.
 Optional TRX work mode: “Transmit combining or independency”, “PBT”,
“Transmit diversity”, ”Receive diversity“, ”Four way receive diversity”.
 S2
 Two TRXs of RRU are configured in a S2 cell.
 Optional TRX work mode: ” Transmit combining or independency “, ”Receive
diversity”.
 S1/1
 Two TRXs of RRU are configured in two S1 cells.
 Optional TRX work mode: ” Transmit combining or independency “, ” Receive
diversity“.
 Actually, the TRX only have single receiving channel.

Combination Solution of Two RRUs
 Two RRUs are combined to share receive and transmit channels so that
the configuration is more flexible. In the following figure, the cable
between CPRI_W and CPRI_E are used for the TRX baseband signal
interconnection, while RX_IN/OUT is only used for two way receiving
diversity between two RRUs.
Interface
Processing
Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
Interface
Processing
Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT

RRU Transmit Mode-Transmit Combining
or Independency
 In this mode, two TRXs of RRU are both work.
 In this mode, the system will work on the transmit independency or transmit
combining mode automatically, according to the power mode and antenna
mode.
 In transmit dependency mode, TRX0 occupies channel A while TRX1 occupies
channel B.
 In transmit combining mode, the combining signal are transmitted through
channel A.

RRU Transmit Mode-Transmit Combining
or Independency
 Transmit independency
 Transmit combining
Interface
Processing
Unit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
Interface
ProcessingUnit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB

RRU Transmit Mode-PBT
 In PBT mode, only the first TRX can work.
 PBT mode can improve the transmitting power to 40W.
 In PBT mode, downlink signal are transmitted through channel A.
Interface
ProcessingUnit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB

RRU Transmit Mode-Transmit Diversity
 In this mode, only the first TRX can work.
 Transmit diversity mode can improve signal the quality of downlink signal.
 In this mode, the signal from the first TRX will be divided to two channels and
be transmitted through channel A and channel B.
Interface
ProcessingUnit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB

RRU Receive Mode-Main and Diversity
 Receive diversity, RRU can work as double TRX mode.
 Each TRX can receive the signal from two feeders.
 In the following figure ， the TRX gets the receiving signal from channel A and
B of the single RRU.
 It is also possible for TRX to use the channel A receiver of the other RRU in
two RRUs combining solution.
InterfaceProcessingUnit
DUP
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
The second
receiving
diversity
signal may
come from
second RRU

RRU Receive Mode-Four Way Receive
Diversity
 In this mode, only the first TRX can work.
 The working TRX gets the uplink signal from four feeders of two RRUs.
 Only the antenna mode “Double Antennas, Four Receivers” can support “Four
way receive diversity”.
Interface
Processing
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
Interface
Processing
DUP
CPRI-E
CPRI-W
ANTA
ANTB
RX-IN
RX_OUT
The other two
receiving
diversity
signal come
from second
RRU

Sector 1 RRU Work Mode Introduction
Sector 2 RRU Typical ConfigurationSector 2 RRU Typical Configuration

Typical Configuration 1
 S1(Transmit Diversity or Transmit
Independency + Receive Mode Main
and Diversity )
 Transmit mode should be set to
“Transmit Independency or combining”
 Receive mode should be set to “Receive
diversity”.
 Antenna mode should be set to” Double
Antenna”.
 It also can be configured as non-ring.
 The maximum transmit power of RF port:
M900: 30W/TRX
M1800:20W/TRX.
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT

 S1(Transmit Diversity + Receive Mode
Main and Diversity )
 Transmit mode should be set to“Transmit
diversity”.
 Receive mode should be set to“Receive
diversity”.
 Antenna mode should be set to “Double
antenna”.
M900: 20W/TRX
M1800:15W/TRX
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT

 S1(PBT + Receive Mode Main and
Diversity )
 Transmit mode should be set to “PBT”.
diversity”.
antenna”.
M900: 40W/TRX
M1800:30W/TRX
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT

 S2(Transmit Independency or
Combining + Receive Mode Main and
Diversity)
 Transmit mode should be set to “Transmit
mode independency or combining”.
diversity”.
antenna”.
M900: 30W/TRX
M1800:20W/TRX
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT

 S2 (PBT + Receive Mode Main
and Diversity)
“PBT”.
 Receive mode should be set to
“Receive diversity”.
 Antenna mode should be set to
“Single antenna and receive
diversity”.
 The maximum transmit power of
RF port:
M900: 40W/TRX
M1800:30W/TRX
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA

 S2 (PBT + Four Way Receive
Diversity)
“PBT”.
 Receive mode should be set to “4
way receive diversity”.
“double antenna and 4 way receive
diversity”.
 It also can be configured as non-
ring.
RF port:
M900: 40W/TRX
M1800:30W/TRX
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT

 S4 (Transmit Combining +
Receive Mode Main and
Diversity)
“Transmit combining or
independency”
“Receive diversity”
“Single antenna and two receive”
RF port:
M900: 15W/TRX
M1800:10W/TRX
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA
ANT
BBU
CPRI5CPRI0 CPRI1
RRU
CPRI_E
CPRI_W
RX-in/out
ANT-
TX/RXB
ANT-
TX/RXA

 S8(Transmit Combining + Receive
Mode Main and Diversity)
“Transmit combining or
independency”.
“Receive diversity”.
“Single antenna and two receive”.
 Actually It is combined by two S4.
 The maximum transmit power of RF
port:
M900: 15W/TRX
M1800:10W/TRX
ANT-
TX/RXA
CPR
I5
CPR
I0
CPR
I1
AN
T
BB
U
RR
U
CPRI
_E
CPRI_
W
RX-
in/out
ANT-
TX/RX
B
ANT-
TX/RX
A
RR
U
CPRI
_E
CPRI_
W
RX-
in/out
ANT-
TX/RX
B
AN
T
RR
U
CPRI
_E
CPRI_
W
RX-
in/out
ANT-
TX/RX
B
ANT-
TX/RX
A
RR
U
CPRI_
E
CPRI_
W
RX-
in/out
ANT-
TX/RX
B
ANT-
TX/RX
A

Chapter 4 DBS3900 Network TopologiesChapter 4 DBS3900 Network Topologies

DBS3900 Network Topologies
 Network Topologies of the BBU
 The BSC and BBUs support multiple network topologies: star, chain, tree, and ring.
 E1/T1 can be used to connect BBU and BSC, or interconnect transmission
equipment, optical fiber and FE cable can be used to connect BBU and Router.
 Network Topologies of the RRU
 The BBU and RRUs support two network topologies: star and chain.
 RRU connect with BBU by optical fiber.

Network Topologies of the BBU
 The BSC and BBUs support multiple network topologies: star, chain,
tree, and ring.

Network Topologies of the RRU
 The BBU and RRUs support two network topologies: star and chain.

Summary
 DBS3900 function and features.
 DBS3900 hardware structure, include BBU and RRU etc.
 The work mode and typical configuration of the RRU.
 Network Topologies of the BBU and RRU.

Huawei DBS3900 Hardware Structure Guide

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Editor's Notes