Ome501103 Huawei Dbs3900 Hardware Structure Issue2.00

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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

HUAWEI DBS3900

Hardware Structure


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Page2Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

References

31182993-DBS3900 GSM Documentation

DBS3900 GSM Technical Description

BBU3900 GSM User Guide

RRU3004 User Guide

RRU3008 User Guide


4/92Page3Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Objectives

Upon completion of this course, you will be able to:

Know the functions of DBS3900

Grasp the hardware structure of DBS3900

Grasp the functions of the RRU3004 and RRU3908

Master typical configuration of DBS3900

Know the networking topology of DBS3900


5/92Page4Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Contents

1. DBS3900 Overview

2. DBS3900 Hardware Components

3. DBS3900 Typical Configuration

4. DBS3900 Networking Topology

5. RRU3008 Introduction


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DBS3900 Location

PSTN

ISDN

PSPDN

Um Interface

DBS3900

DBS3900

DBS3900

DBS3900

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 DBSDistributed Base Station


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Functions and Features

Suitable for various environments, flexible installation

Support PGSM900MEGSM900 DCS1800M

One RRU module can support 2 TRXs

One BBU can support 36TRX at most and 12 cells atmost

BBU support star, tree, chain and ring topology

Low Power Consumption and Energy-Saving


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Functions and Features

Simple Structure and Quick Network Deployment

Flexible Installation and Diversified Scenarios

Cell broadcasting service and point-to-point short

message Support transmit diversity

Support PBT


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Contents

1. DBS3900 Overview






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DBS3900 Basic Structure

DBS3900 is mainly composed of BBU and RRU, optical fiber is adopted between

BBU and RRU

RRU is categorized into two types: DC RRU and AC RRU. The DC RRU supports

DC power inputs and the AC RRU supports AC power inputs. Both the DC RRU and

AC RRU have the RRU3004 and RRU3008 models.


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Contents


2.1 BBU hardware structure

2.2 RRU hardware structure

2.3 Auxiliary Devices

2.4 Application Scenarios


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BBU

The typical power consumption of BBU is 35W

The weight of the BBU is 12 kg at most

All the boards can be inserted from the front panel

The permissible range of power input is 38.4 V DC to 57 V DC


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Working Principles of the BBU


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Boards and Modules in BBU

BSBC: The universal BBU Subrack Backplane type C

GTMU: The GSM Transmission, Timing and Management Unit

UBFA: The Universal BBU Fan unit type A

UPEU: The Universal Power and Environment interface Unit

UELP: The Universal E1/T1 Lightning Protection unit

UEIU: The Universal Environment Interface Unit


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BSBC Board

The BSBC provides slot 6 for the GTMU, slot 7 for a main control board

that supports 3G, and slots 0 to 5 as common slots. The GTMU is 1 U

high. Therefore, from the view of the front panel, the GTMU is located in

slots 5 and 6

Provide backplane interfaces, communication channels, distribute clock

signal and +12V power supply for the other boards


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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 monitoring, OM,

and external alarm collection.

Distributes and manages BTS clock signals

Provides the Ethernet port for terminal maintenance

Supports four routes of E1 inputs

Provides the CPRI ports for communication with the DRFU


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GTMU Ports

LabelConnector

TypeDescription

CPRI0-

CPRI5SFP

Ports for the communication between the BBU and the RF module;

support input and output of the optical and electrical signal .

ETH RJ45 Port for local maintenance and commissioning

FE0 RJ45

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

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 USBA reserved port that performs the following function:

Enables the automatic software upgrade from a USB disk.

TST USB Provids a reference clock for the tester.

E1/T1DB26

female

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

GTMU and the UELP or between the GTMU and the BSC.


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GTMU IndicatorsLED Color Status Description

ON The board is faulty.

OFF No power supply is available or the board is faulty.

ON for 1s, OFF for 1s The board is operational.

ON for 2s, OFF for 2s The OML link is abnormal.

ON for 0.125s

OFF for 0.125sThe board is loading software.

ON A fault occurs in the running board.

OFF No alarm is generated.

ON The board is operational.

OFF The board is faulty.

ON This link is not used.

ON for 0.125s

OFF for 0.125s

A remote E1/T1 alarm is generated.

OFF This link is operational.

Green ON The CPRI link is normal.

Red ONThe reception of the optical module is abnormal and an alarm

is generated.

CPRI0-

CPRI5

LIU0-LIU3 Green

ACT Green

ALM Red

RUN Green


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UELP

UELP is the E1/T1 signal lightening protection unit of BBU and it

can provide protection for 4 route E1/T1 signal

Port Type Relative cables Description

INSIDE DB25 male E1 transferringcable

Transfers the four E1/T1

signals between the UELP andthe GTMU

OUTSIDE DB26 male E1/T1 cable

Provides the input and output

of the four E1/T1 signals

between the BBU and the BSC

GTMU


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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 monitoringsignals

Port Type Description

MON0 RJ45

Transmitting two RS485

environment monitoring signals

MON1 RJ45Transmitting two RS485

environment monitoring signals

EXT-

ALM0RJ45

Transmitting four dry contact

alarms

EXT-

ALM1RJ45

Transmitting four dry contact

alarms

PWR 3V3 +24 V/-48 V DC power input


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UEIU

UEIU is the environment interface board of BBUit can support

multi-route monitoring signal input

UEIU is optional and is only used when more ports are needed

LabelConnector

TypeDescription

MON0 RJ45 One RS485 signal

MON1 RJ45 One RS485 signal

EXT-

ALM0RJ45

Four dry contact

signals

EXT-

ALM1RJ45

Four dry contact

signals


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Monitoring System


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USCU

The Universal Satellite Card and Clock Unit (USCU) is compatible with six types

of satellite card, provides absolute timing information and the 1 Pulse Per

Second (PPS) reference clock for the main control board, and provides the

RGPS ports and BITS port.

Port Description

1 GPS port Used for receiving GPS signals

2 RGPS ports Used for receiving RGPS signals

3 BITS portConnected to the BITS clock; supporting adaptive input

of the 2.048 MHz and 10 MHz clocks

4 TEST port Used for testing the clock


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UBFA

The universal BBU fan unit type A (2U) (UBFA) works with the air inlet box of

the cabinet to form a ventilation circuit, thus cooling the entire cabinet

The UBFA module 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

0.125s ON,0.125s OFF

(Green)

The module is not registered, and

no alarm is reported.

1s ON, 1s

OFF (Green)The module is running properly.

1s ON, 1s

OFF (Red)The module is reporting alarms.

OFFThe module is powered off or the

program is not loaded.

STAT

E

Red

/Green


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BBU Cables Connection

BBU cables connection between BBU, BSC, RFU and

Auxiliary equipment


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BBU Hardware structure-Review

Please fill the boards name in the blank of the BBU

panel


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Contents







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RRU

RRU handles modulation and demodulation between

baseband signals and RF signals, data processing, and

combining-distribution. There are two kinds RF Unit,

RRU3004 and RRU3008

RRU3004 can support a maximum of two TRXs.

RRU3008 can support a maximum of eight TRXs.


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RRU3004 Module

The RRU3004, a remote radio

unit designed on the basis of

double-transceiver technology,

mainly applies to the small or

medium-capacity sites.

RRU3004 module can support a

maximum of two TRXs.


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RRU3004 Functions

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.


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Logical Structure of the RRU3004

RXM_OUT: RRU RX main output for RRU

cascading

RXD_IN: RRU RX diversity input for RRU

cascading


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RRU3004 Module

The RRU module has a

bottom panel, a cabling

cavity panel, and an areaattached with LEDs.

Provides - 48VDC power

supply.

1 Bottom panel

2 Cabling cavity panel

3 LEDs


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RRU3004 Ports

Item Label Description

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

RTN+

NEG-Power wire post

TX RX

CPRI_EEastern optical port

TX RX

CPRI_WWestern optical port

EXT_ALM Alarm Port

RST Hardware reset buttonTST VSWR Test button for VSWR alarms

TST CPRI Test button for the CPRI port

Cabling cavity

panel

Bottom panel


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RRU3004 LEDsLED Colo

rStatus Description

ON The RRU is faulty.

OFF No power input is available.1s ON,1s

OFF

The RRU runs properly.

ON for 0.25s

OFF for 0.25sThe software is being loaded.

ON or

Blinking

(1s ON, 1s

OFF)

The RRU is faulty and reporting alarms.

OFF No alarm is generated.

ON The RRU runs properly.

OFF The connection to the BBU is not established.

OFF No VSWR alarm is generated.

1s ON1s OFF

A VSWR alarm is generated on the ANT_TX/RXBport.

ONA VSWR alarm is generated on the ANT_TX/RXA

port.0.125s ON

0.125s OFF

A VSWR alarm is generated on the ANT_TX/RXA

and ANT_TX/RXB ports.

VSWR

TX_AC

T

Red

ACTGree

n

ALM Red

RUNGree

n


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RRU3004 LEDs

Green The CPRI link is functional.

RedThe reception of the optical module is

abnormal and an alarm is generated.Blinking red

0.25s ON, 0.25s

OFF

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

OFFThe SFP module is not in position or

the optical module is powered off.

Green The CPRI link is functional.

RedThe reception of the optical module is

abnormal and an alarm is generated.Blinking red

0.25s ON, 0.25s

OFF

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

OFFThe SFP module is not in position or

the optical module is powered off.

CPRI_E

(eastward

CPRI LED)

Red or

green

CPRI_W(westward

CPRI LED)

Red or

green


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RRU3004

RRU3004 consists of 2 RRU modules

The maximum weight of 1 RRU module is 15 Kg. it can be installed on the

wall, pole, tower and stand

-48DC power is adopted


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DC RRU3004

DC RRU3004 support -48V input


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AC RRU3004

AC RRU3004 support 220VAC input

C t t


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Contents






A ili D i


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Auxiliary Devices

To meet the customer requirements of backup power or

installation space for transmission devices, Huawei provides

suitable auxiliary devices

The auxiliary devices provided by Huawei for the DBS3900

are the Advanced Power Module (APM30), Battery Backup

Cabinet (BBC), and Transmission Cabinet (TMC)

Characterized by the compact structure and stackable

design, the APM30, BBC, and TMC are easy to transportand applicable to outdoor installation scenarios

APM30 O i


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APM30 Overview

The APM30 provides 48V 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 lightening

protection.

1. Filler panel (1U)2. Power subrack (3U)

3. DC PDU (2U)

4~8. 1U Filler panel

9. Space for batteries (3U)

BBC O i


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BBC Overview

The BBC is installed if long-

time power backup is required.

Small sized and easy totransport, the BBC is

adaptable to outdoor

environments. In addition, theBBC can dissipate heat in

direct-ventilation mode.

The BBC provides amaximum DC backup power

of 48 V 184 Ah through the

built-in batteries

IBBS Overview


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IBBS Overview

The IBBS is developed as an auxiliary product for

Huawei outdoor BTS. The IBBS provides backup

power to meet the requirements for fast network

deployment in high temperature areas.

Output power: providing 48 V DC power supply

Backup power mode: parallel connection between

batteries

Temperature control: built-in air conditioner

Alarm system: monitoring the door control, smoke,

and temperature alarms

TMC O i


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TMC Overview

The TMC is configured if

more transmission space is

required. Small sized andeasy to transport, the TMC

is adaptable to outdoor

environments. The TMC

dissipates heat through the

breathable film and fans.

The BBU3900 can be

installed in the TMC

Contents


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Contents






DBS3900 Application Scenarios


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pp

BBU+RRU+APM APM can supply -48VDC power to BBU and RRU, and can supply space for

transmission equipment and batteries

DBS3900 Applications


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DBS3900 Applications

DBS3900 can provide solutions to the coverage in multiple scenarios

such as in urban and rural areas, in buildings, or along highways and

railways.

Contents


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Contents

1. DBS3900 Overview





Contents


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Contents


3.1 RRU3004 Working Mode

3.2 RRU3004 Typical Configuration

RRU3004 Internal Structure


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RRU3004 Internal Structure

2 TRXs and 2 duplexers are integrated in RRU module which can be

connected to antenna directly

The RX_IN/OUT port of RRU can support the receiving signal interconnection

between 2 RRUs, so that it can support the diversity receiving between 2RRUs

Inte

rfaceProcessing

Unit

DUP

DUP

CPRI-E

CPRI-W

ANTA

ANTB

RX-IN

RX_OUT

RRU3004 Antenna Mode


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Single Feeder

Single Feeder (1TX + 1RX), for one module configuration

Single Feeder (1TX + 2RX), for two modules configuration

Double Feeder

Double Feeder (1TX + 1RX), for one module configuration



Double Feeder (2TX + 4RX), for two modules configuration

RRU Single Feeder


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RRU Single Feeder

1TX+1RX 1TX+2RX

TX/RX RXTX/RX

RRU Double Feeder


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RRU Double Feeder

1TX+1RX 1TX+2RX

RXTX RXTX/RX

RRU Double Feeder


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RRU Double Feeder

2TX+2RX 2TX+4RX

TX/RX RXTX/RX RXTX/RXTX/RX

RRU3004 Transmit Mode and Receive


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Mode

RRU3004 Transmit mode

Transmit independency

Transmit combining

PBT

Transmit diversity

RRU3004 receive mode

Main and diversity

RRU3004 Transmitting Mode -

T it I d d


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Transmit Independency

In independency mode, TRX 0 occupies channel 1 while TRX1

occupies channel 2

CPRI0

CPRI1

In

terface

ProcessingUnit

ANT1

ANT2

DUP

DUP

RRU3004 Transmitting Mode - transmit

bi i


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combining In transmit combining modethe two TRXs will be combined and

transmitted through channel 1

CPRI0

CPRI1

In

terface

Proce

ssingUnit

ANT1

ANT2

DUP

DUP

RRU3004 Transmitting Mode -


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PBT In PBT mode, only the first TRX can work PBT mode can improve the transmitting power to 40W

In PBT modeonly channel 1 is used by downlink signal

CPRI0

CPRI1

In

terface

ProcessingUnit

ANT1

ANT2

DUP

DUP

RRU Transmitting Mode - Transmit

Di it


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Diversity In this mode, only the first TRX can work

Transmit diversity mode can improve the quality of downlink signal

In this modethe signal from the first TRX will be divided to 2 channel

and be transmitted through channel 1 and channel 2

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP

Question


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Q

When configuring Transmit Mode, Transmit Independency

or Combining can be chosen. How can we know whether

Transmit Independency or Transmit Combining is used?

It will be decided by antenna mode. When 2 TRXs are used

in one DRFU,

If the antenna mode is Single antenna or Double

antenna(1TX), the transmit mode must be Transmit

Independency

If the antenna mode is Double antenna(2TX), the transmit

mode must be Transmit Combining

RRU Receiving Mode - Main and

Diversity


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Diversity In this modeboth of the 2 TRXs can work

Each TRX receives the signal from 2 feeders

In the following figurethe TRX get the receiving signal from channel A

and B of the single RRU

It is also possible for TRX to use the channel 1 receiver of the other RRU

in 2RRUs combination solution

From RX-in, TRXcan also use the

channel A of the

other RRU, so

channel B of the

two RRUs are

canceled

CPRI0

CPRI1

Interf

ace

Processin

gUnit

ANT1

ANT2

DUP

DUP

RX-IN

RX_OUT

Combination Solution of 2 RRU3004s


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2 RRUs are combined to share receive and transmit channels so that the configurationis 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 2 way receiving diversity

between 2RRUs.

Interface

ProcessingUn

it

DUP

DUP

CPRI-E

CPRI-W

ANTA

ANTB

RX-IN

RX_OUT

Int

erface

ProcessingUnit

DUP

DUP

CPRI-E

CPRI-W

ANTA

ANTB

RX-IN

RX_OUT

Contents


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3.1 RRU3004 Working Mode

3.2 RRU3004 Typical Configuration

RRU3004- S1/S2


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S1 Configuration

Transmit mode: Transmit diversity

Receive mode: Main and diversity

Antenna mode: Double

antennas(2TX+2RX)

S2 Configuration

Transmit mode: Combining or

independency

Receive mode: Main and diversity

Antenna mode: Doubleantennas(1TX+2RX)

RRU3004 - S4


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S4 Configuration

Transmit mode: Combining

Receive mode: Main and

diversity

Antenna mode: Single antenna

(1TX+2RX)

RRU3004 S6


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S6 Configuration


Receive mode: Main and

diversity

Antenna mode:

RRU0: Single antenna

(1TX+2RX)

RRU1: Single antenna

(1TX+2RX)

RRU2: Double antenna

(1TX+2RX)

Contents


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1. DBS3900 Overview





DBS3900 Networking Topology


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BBU networking topology

Star, tree, chain and ring networking topology can be adopted

between BBU and BSC

E1/T1 transmission mode can be used between BBU and BSC or

transmission devices. Optical fiber or Ethernet cable can also be

adopted between BBU and router devices to take the place of E1/T1

based on the support of the software version RRU networking topology

Star, chain and ring networking topology can be adopted between

BBU and RRU Optical fiber is used between RRU and BBU

BBU Networking Topology


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Star, tree, chain and ring networking topology can be

adopted between BBU and BSC

BSCChain modeTree

mode

Star mode

Ring mode

BBU

BBU

BBU

BBUHUB

BTS

RRU Networking Topology


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Star, chain and ring networking topology can be adopted between

BBU and RRU

BSC

Star mode

Ring mode

Chain mode

BBU

BBU

BBU

RRU

RRU

RRU

Contents


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1. DBS3900 Overview





Contents


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5.1 RRU3008 Hardware Structure

5.2 Configuration Principle

5.3 Typical Configuration

Function of RRU3008


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RRU3008 (GSM Remote Radio Filter Unit) is an outdoor

remote RF unit. It processes baseband signals and RF

signals

RRU3008 performs modulation and demodulation between

baseband signals and RF signals, processes data, and

combines and divides signals

One RRU3008 module based on multi-carrier technology

supports eight carriers

Multi-carrier Technology


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The principle of multi-carrier technology: multiple carriers share one power

amplifier and one RF channel.

Baseband pool replaced independent baseband unit. Improve the

integration.

Digital IF combination replaced Analog RF combination. There isnt

combination loss.

Single-carrier Technology Multi-carrier Technology

Appearance of RRU3008


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DC RRU3008 AC RRU3008

TYPE Height (mm) Width (mm) Depth (mm)

DC RRU3008 485 380 210

AC RRU3008 485 380 250

Logical structure of RRU3008


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The RRU3008 consists of the High-speed Interface Unit, Signal

Processing Unit, Power Amplifier (PA), Dual Duplexer, and Low

Noise Amplifier (LNA).

DC RRU3008


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No. description

a LED

b Cabling cavity panel

c Bottom panel of the DC

RRU


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Ports of RRU3008RX_IN/OUT

1 2


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1Cabling cavity panel

2Bottom panel of the DC RRU

TX RX CPRI_E

TX RX CPRI_W

ANT_TX/RXA

ANT_TX/RXB

Item Label Description

RX_IN/OUT RF interconnection port

RET RET antenna port

ANT_TX/RXA RF TX/RX port A

ANT_TX/RXB RF TX/RX port B

RTN+

NEG-Power wiring post

TX RX

CPRI_E

Eastward optical/electrical

port

TX RX

CPRI_W

Westward optical/electrical

port

EXT_ALM Alarm port

RST Hardware reset button

VSWRTest button for VSWR

alarms

Cabling

cavity

panel

Bottom

panel of the

DC RRU

LEDs of RRU3008


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Label Color Status Meaning

ON The board is faulty or undergoing version verification.

OFF No power input is available.

ON for 1s and OFF for 1s The board is operational.

ON for 0.25s and OFF for 0.25s The software is being loaded.

ON for 0.25s and OFF for 0.25sThe alarms (excluding VSWR related alarms) are

reported.

OFFNo alarms (excluding VSWR related alarms) are

reported.

ON The board is operational.

OFF No power input is available.

ON (red)The power amplifier is not operational. VSWR alarms

are reported from the ANT_TX/RX port.

ON for 0.25s and OFF for 0.25s

(red)

The power amplifier is operational. VSWR alarms

reported from the ANT_TX/RX port are being held.

OFF No VSWR alarms are reported.

VSWR Red

TX_ACT Green

ALM Red

RUN Green

LEDs of RRU3008


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Label Color Status Meaning

ON (green) The CPRI link is functional.

ON (red)The reception of the optical module is

abnormal and an alarm is generated.

ON for 0.25s and OFF for

0.25s (red)

The CPRI link has a loss-of-lock

error.

OFF

The SFP is out-of-position or the

optical

module is powered off.

ON (green) The CPRI link is functional.

ON (red)The reception of the optical module is

abnormal and an alarm is generated.

ON for 0.25s and OFF for

0.25s (red)

The CPRI link has a loss-of-lock

error.

OFF

The SFP is out-of-position or the

optical

module is powered off.

CPRI_E

(eastward

CPRI LED)

Red/gree

n

CPRI_W

(westward

CPRI LED)

Red/green

Contents


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Single Feeder

Single Feeder (1TX + 1RX)

Single Feeder (1TX + 2RX)

Double Feeder

Double Feeder (1TX + 1RX)




Transmit Mode and Receive Mode of

RRU3008


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RRU3008 Transmit Mode

Transmit independency or combining

RRU3008 Receive Mode

Main diversity receiver

Limitation of RRU3008


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RRU3008 supports whole frequency band of PGSM 900MHz,

850MHz, high 40MHz frequency band and low 40MHz frequency

band of 1900MHz Instantaneous frequency bands of one TX channel: 12.5MHz.

Instantaneous bandwidth of one RX is 25MHz

RRU3008 DL UL

Whole 25MHz frequency band of 900MHz 935-960MHz 890-915MHz

Whole frequency band of 850MHz 869-894MHz 824-849MHz

Low 40MHz of 1900MHz 1930-1970MHz 1850-1890MHz

High 40MHz of 1900MHz 1950-1990MHz 1870-1910MHz

Basic configuration principle of

RRU3008


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One BBU3900 supports the maximum cell configuration of

S24/24/24. It cannot be more than 24TRX for each CPRI

port.

RRU3008 supports a maximum of eight GSM carriers.

RRU3008 supports 2-way TX and 2-way RX.

When RRU3008 support transmit diversity, the TRX it

supports reduce to 4TRX.

One RRU3008 does not serve two cells.

Configuration principle of

RRU3008


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One RRU3008 is adopted when S3-S8.

When it is larger than S8, two RRU3008s interconnected

are adopted by default.

When it is 2TX mode, the TRX number of the two channels

should be less than 1. For example, for S5, one RF channelcan only be configured 2TRX and another RF channel can

only be configured 3TRX.

Contents


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Typical configuration of RRU3008


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S3 S8

Transmit mode: No Combining

Receive mode: Main Diversity Antenna mode: Double Feeder

(2TX + 2RX)

S1 S4

Transmit mode: Transmit

Diversity

Receive mode: Main Diversity

Antenna mode: Double Feeder

(2TX + 2RX)



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S5 S16

Transmit mode: No Combining


Antenna mode: Double Antenna

(2TX + 2RX)



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S5 S16



Antenna mode: Single

Antenna (1TX + 2RX)

Summary


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DBS3900 functions and features

DBS3900 hardware structure including BBU and RRU

Working mode of RRU and typical configuration

BTS networking topology and RRU networking topology

Ome501103 Huawei Dbs3900 Hardware Structure Issue2.00

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