79183300 huawei gsm dbs3900 hardware structure2 0

2008-03

www.huawei.com

HUAWEI Confidential

Security Level: Internal Use

HUAWEI GSM DBS3900 Hardware Structure

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI 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


Chapter 1 DBS3900 Hardware StructureChapter 1 DBS3900 Hardware Structure

Chapter 2 DBS3900 Typical Configuration


Abbreviation

RRU Remote Radio unit

BBU Base Band unit

GTMU Transmission& Timing& Management Unit for BBU

UPEAUniversal power and Environment interface unitType 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 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

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

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

USB USB connector

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

TST USB connector

- 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 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.


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 RJ45Connector

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

MON1 RJ45Connector

Reserved

EXT-ALM0

RJ45Connector

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

EXT-ALM1

RJ45Connector

Reserved

PWR 3V3PowerConnector

–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 RJ45Connector

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

MON1 RJ45Connector

Reserved

EXT-ALM0

RJ45Connector

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

EXT-ALM1

RJ45Connector

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)RJ45Connector

(2) Cord end terminal

Monitoring signal cable between the OFB and the BBU

Monitoring signal cable between the APM and the BBU

(1)RJ45Connector

(2) Cord end terminal

(3)OTConnector

(4)Common 3PINConnector




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(westward/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 1 DBS3900 Hardware Structure

Chapter 2 DBS3900 Typical ConfigurationChapter 2 DBS3900 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/TRXBBU

CPRI5CPRI0 CPRI1

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-TX/RXB

ANT-TX/RXA

ANT



S2 (PBT + Receive Mode Main

and Diversity) Transmit mode should be set to

“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) Transmit mode should be set to

“PBT”. Receive mode should be set to “4

way receive diversity”. Antenna mode should be set to

“double antenna and 4 way receive

diversity”. It also can be configured as non-

ring. 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

ANT



S4 (Transmit Combining +

Receive Mode Main and

Diversity) Transmit mode should be set to

“Transmit combining or

independency” Receive mode should be set to

“Receive diversity” Antenna mode should be set to

“Single antenna and two receive” The maximum transmit power of

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 mode should be set to

“Transmit combining or

independency”. Receive mode should be set to

“Receive diversity”. Antenna mode should be set to

“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

CPRI5

CPRI0

CPRI1

ANT

BBU

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-TX/RXB

ANT-TX/RXA

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-TX/RXB

ANT

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-TX/RXB

ANT-TX/RXA

RRU

CPRI_E

CPRI_W

RX-in/out

ANT-TX/RXB

ANT-TX/RXA

Thank You

www.huawei.com

79183300 huawei gsm dbs3900 hardware structure2 0

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