04 G-LI 003 DBS3900 Hardware Structure-20080321-A-2.0.pdf

2008-03

� www.hua

wei.com

HUAWEI Confidential

Security Level: Internal Use

HUAWEI GSM DBS3900

Hardware Structure

HUAWEI TECHNOLOGIES Co., Ltd. Page 2HUAWEI Confidential

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

MAP

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

Integrated Backup Battery SystemIBBS

Universal FE/GE Lighting Protection unit UFLP

Common Protocol Radio Interface CPRI

Advanced Power ModuleAPM

Universal E1/T1 Lighting Protection unit UELP

Universal Environment Interface unitUEIU

OFB

UBFA

BSBC

UPEA

GTMU

BBU

RRU

Base Band unit

Remote Radio unit

Outdoor Facility Box

Universal BBU Fan Unit Type A (2U)

Universal BBU Subrack Backplane Type C (2U)

Universal power and Environment interface unit

Type A (-48v)

Transmission& Timing& Management Unit for BBU


Sector 1 DBS3900Sector 1 DBS3900 Hardware ComponentsHardware 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

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

E1/T1 cable of the BBU

DB26 male connector

E1/T1

Tests the output clock signals with a tester-USB connector

TST

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

-USB connector

USB

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

-DLC connector

FE1

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

-RJ45 connector

FE0

Performs local maintenance and commissioningCrossover cable (delivered with the equipment)

RJ45 connector

ETH

Provides the input and output of the optical signalsCPRI optical cable between the BBU and the RRU

DLC connector

CPRI0–CPRI5

DescriptionCableTypePort


GTMU Board

� LEDs on the GTMU Panel

The reception of the optical module is abnormal and an alarm is triggered.

OnRed

The CPRI link is functional.OnGreenCPRI0-CPRI5

This link is not used or the alarm is cleared.Off

A remote E1/T1 alarm is generated.Blinking four times/s

A local E1/T1 alarm is generated.OnGreenLIU0–LIU3

The board is faulty.Off

The board is operational.OnGreenACT

An alarm is not generated.Off

A fault occurs in the running board.OnRedALM

The board is loading software.Blinking four times/s

The OML link is abnormal.Blinking once/4s

The board is operational.Blinking once/2s

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

The board is faulty.OnGreen RUN

DescriptionStatusColorLED


GTMU Board

� DIP Switch of GTMU

The T1 impedance is set to 100 Ω.

OFFON

The E1 impedance is set to 120 Ω.

ONOFF

The E1 impedance is set to 75 Ω.

ONONSW1

21

DescriptionDIP statusDIP switch

The E1 cable is not grounded.

OFFOFFOFFOFF

The E1 cable is grounded.

ONONONONSW2

4321


The E1 link cannot be bypassed.

OFFOFFOFFOFF

The E1 link can be bypassed.

ONONONONSW4

4321


The E1 link of the Level 5 cascaded BTS can be bypassed.

OFFOFFONOFF


OFFOFFONON


OFFONOFFOFF


OFFONOFFON


OFFONONOFF

The E1 link cannot be bypassed.

ONONONONSW5


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.

The board operates normally.Blinking once every two seconds

Green

An alarm is generated.OnRed

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

Blinking twice per second

Green STATE

DescriptionStatusColorLED


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.

–48V power input3V3PowerConnector

PWR

ReservedRJ45Connector

EXT-ALM1

Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry contact

RJ45Connector

EXT-ALM0


MON1

Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol

RJ45Connector

MON0

DescriptionTypePort


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.


EXT-ALM1

Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry contact

RJ45Connector

EXT-ALM0


MON1

Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol

RJ45Connector

MON0

DescriptionTypePort


UELP Board

� The universal E1/T1 lightning protection unit (UELP) provides lightning

protection for four E1/T1 signals.

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

E1/T1 cables of the BBU

DB26male connector OUTSIDE

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

E1 transfer cable of the BBU

DB25 male connectorINSIDE

DescriptionCableTypePort

Coaxial cable（75Ω E1）OFFONOFFON

Twisted-pair cable（100Ω T1 or 120Ω E1）OFFOFFOFFOFFSW1

4321

DescriptionDIP StatusDIP Switch

� 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

(2) Cord end

terminal

(1)RJ45

Connector

Monitoring signal cable between the OFB and the BBU

Monitoring signal cable between the APM and the BBU

(4)Common

3PIN

Connector

(3)OT

Connector

(2) Cord end

terminal

(1)RJ45

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

RXD_IN:RRU RX diversity input for RRU

cascading

RXM_OUT:RRU RX main output 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.

LEDs3

Cabling cavity panel2

Bottom panel1


RRU Module

� Ports of the RRU Module

Test button for the CPRI portTST CPRI

Test button for VSWR alarmsTST VSWR

Hardware reset buttonRST

Alarm PortEXT_ALM

Western optical portTX RX CPRI_W

Eastern optical portTX RX CPRI_E

NEG-

Power wire postRTN+Cabling cavity

panel

RF TX/RX port BANT_TX/RXB

RF TX/RX port AANT_TX/RXA

RET antenna portRET

Interconnection ports for RF signalsRX_IN/OUTBottom panel

DescriptionLabelItem


RRU Module

� LEDs on the RRU Module

The SFP module is out-of-position or the optical module is powered off.Off

The CPRI link is out of lock.Blinking once every two seconds (red)

The reception of the optical module is abnormal and an alarm is triggered.On (red)

The CPRI link is functional.On (green)OPTW/E(westwar

d/eastward CPRI

LED )

A VSWR alarm is detected at the ANT_TX/RXA and ANT_TX/RXB ports.On (red)

A VSWR alarm is detected at the ANT_TX/RXB port.Blinking once per second (red)

A VSWR alarm is detected at the ANT_TX/RXA port.Blinking once every two seconds (red)

The board is operational.Blinking once every two seconds (green)

No VSWR alarm is detected.On (green)VSWR TX_ACT

Local test statusBlinking twice per second

Only one logical transceiver is functional (including TRX mutual aid is

implemented).

Blinking once every two seconds

The connection with the BBU is not established.Off

Normal operationOnACT

No alarm is detected.Off

There is a fault related to the running board.On (blinking at high frequency)ALM

The board is operational.Blinking once every two seconds

No power input is available.Off

The board is faulty.OnRUN

MeaningStatusLED


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 RRUSector 1 RRU Work Mode IntroductionWork 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.

Inte

rface

Pro

cessing

Un

it

DUP

DUP

CPRI-E

CPRI-W

ANTA

ANTB

RX-IN

RX_OUT

Inte

rface

Pro

cessing

Un

it

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

Pro

cessing

Unit

DUP

DUP

CPRI-E

CPRI-W

ANTA

ANTB

Interface

Pro

cessing U

nit

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

Pro

cessing U

nit

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

Pro

cessing U

nit

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.

Interface P

rocessin

g U

nit

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

Pro

cessing

DUP

CPRI-E

CPRI-W

ANTA

ANTB

RX-IN

RX_OUT

Interface

Pro

cessing

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 RRUSector 2 RRU Typical ConfigurationTypical 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/RXBANT-

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/RXBANT-

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/RXBANT-

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/TRXBBU

CPRI5CPRI0 CPRI1

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-

TX/RXBANT-

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/RXBANT-

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/RXBANT-

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/RXBANT-

TX/RXA

ANT

BBU

CPRI5CPRI0 CPRI1

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-

TX/RXBANT-

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

ANT

BBU

RRU

CPRI

_E

CPRI_

W

RX-

in/out

ANT-

TX/RX

B

ANT-

TX/RX

A

RRU

CPRI

_E

CPRI_

W

RX-

in/out

ANT-TX/RX

B

ANT

RRU

CPRI

_E

CPRI_

W

RX-

in/out

ANT

TX/RXB

ANT-

TX/RX

A

RRU

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.

Thank You

www.huawei.com

Documents

04 G-LI 003 DBS3900 Hardware Structure-20080321-A-2.0.pdf