5 huawei bts3012 hardware structure

7/27/2019 5 HUAWEI BTS3012 Hardware Structure

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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

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Internal

HUAWEI BTS3012

Hardware Structure

GSM BSS Training Team


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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

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

Know the functions and features of BTS

Master the BTS hardware structure

Master the cable connection of BTS


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References

BTS3012 Technical Manual

BTS3012 Installation Manual

BTS3012 User Manual


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Chapter 1 Overview

Chapter 2 System Components

Chapter 3 Signal Processing

Chapter 4 Typical configuration


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Location

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

PSTN

ISDN

PSPDN

Um Interface

BTS3012

BTS3012

BTS3012

BTS3012

OMC

HLR/AUC/EIR

BSC

MSC/VLR

SMC/VM

A Interface

MAP

TUP,ISUPMS

MS

MS


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Features and Functions (for 12TRXs)

Support GSM800M850M900M1800M1900M

Support networking topology includes star, tree, chain and ring

Support A5/1 and A5/2 encryption/decryption

Support GPRS and EDGE

Support dynamic and static power control

Support the omni-directional coverage and directional

coverage


7/138HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 7


Double Transceiver Unit (DTRU). A single cabinet can support

up to 12 carriers. It can smoothly evolve into WCDMA

Transmit diversity, 4-receive diversity

Support Power Boost Technology (PBT)

BTS3012 can share cabinet with WCDMA base station. The

module of WCDMA base station can be inserted in the

BTS3012 cabinet

Support more various transmission mode includes E1, STM-1,

microwave, and satellite transmission

The DTRU of the BTS3012 can be inserted intoBTS30/BTS312 with -48V DC power supply


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Features and Functions (BTS3012- for 18TRXs)

One cabinet can hold up to 18 TRXs and multiple cabinets can hold up to

54 TRXs.

Power Boost Technology (PBT): The maximum output power of the TRX

can reach up to 100 W.

The static sensitivity of the TCH/FS is -112.5 dBm (typical value in normal

temperature).

Transmit diversity and four-way receive diversity

Baseband frequency hopping and RF frequency hopping

Multiple transmission modes: E1, T1, STM-1, microwave, and satellite

transmission

Multiple frequency bands: 850MHz, 900MHz, 1800MHz, and 1900MHz.

The cabinet can meet the deployment requirements in different regions.


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Holds up to 36 TRXs per cabinet.

Supports the Hub BTS function.

Supports soft synchronization on the Um interface.

Supports rapid switchover of the ring topology.

Supports Flex Abis networking.

Supports optimized Abis transmission.

Supports local switching.

Supports Abis over IP.

Supports clock over IP.

The static sensitivity of the TCH/FS is -113 dBm (typical value in

normal temperature).

Supports various transmission modes: E1, FE, T1, STM-1,

microwave, and satellite transmission.

Supports the 900 MHz frequency band.


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Chapter 1 Overview





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Hardware structure (for 12TRXs)

TMA TMA

DTRU DAFU

Antenna and feeder

subsystem

Forepart of RF

Subsystem

TMA TMA

DTRU DAFU

TMA TMA

DTRU DAFU

Double transceiver

subsystem

DATU

Um Interface

DATU

fiber

E1

Abis Interface

M

E

L

C

Common subsystem

NFCB

Metro 100

DTMU

DEMU

E1

BITSMonitor TBUS/DBUS/CBUS

MS

FH_BUS

Extension

cabinet


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BTS3012 Cabinet and Boards (for 12TRXs)

D D D D

Wiring & Air Inlet

Wiring

D

DPU

DCOM

DCOM

DDPU

DCOM

D

TRU

D

TRU

D

TRU

D

TRU

D

TRU

D

TRU

Wiring

FAN

Air Inlet

MLC

Power andE MC

Transmission Unit

DDPU

ELC

ELC

SAC

Transmission Unit

DTM

U

DTM

U

DEM

U

DC

CU

DC

SU

DA

TU


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BTS3012 Cabinet and Boards (for 18TRXs & for 36TRXs )

For 18 TRXs For 36 TRXs


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Abbreviations Description

DTRU Double Transceiver Unit

DTMU Transmission & Timing & Management Unit for DTRU BTS

DCCU Cable Connection Unit for DTRU BTS

DAFU Antenna Front-end Unit for DTRU BTS

DDPU Dual Duplexer Unit for DTRU BTS

DCOM Combining Unit for DTRU BTS

DATU Antenna and TMA Control Unit for DTRU BTS

DMLC Monitor Signal Lightning-Protection Card for DTRU BTS

DELC E1 Signal Lightning-Protection Card for DTRU BTS

DSAC Signal Access Card for DTRU BTS

DCSU Combined cabinet Signal connection Unit for DTRU BTS

DEMU Environment Monitoring Unit for DTRU BTS

DCTB Cabinet Top Backplane for DTRU BTS

FAN Box NodeB Fan Controlling and monitoring Board


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Subrack Board/Module Full Name Configuration Quantity in One

Cabinet

Full

Configuration

Minimum

Configuration

Common subrack

DTMU Transmission/Timing/Management Unit for DTRU BTS 2 1

DEMU Environment Monitoring Unit for DTRU BTS 1 0

DATU Antenna and TMA Control Unit for DTRU BTS 2 0

DCSU Combined cabinet Signal connection Unit for DTRU BTS 1 1

DCCU Cable Connection Unit for DTRU BTS 1 1

ECMB Enhanced Common Module Backplane for DTRU BTS 1 1

Set-on-top

subrack

DELC E1 Signal Lightning-Protection Card for DTRU BTS 3 1

DMLC Monitor Signal Lightning-Protection Card for DTRU BTS 1 0

DSAC Signal Access Card for DTRU BTS 1 1

DCTB Cabinet Top Backplane for DTRU BTS 1 1

DTRU subrackDTRU Double-Transceiver Unit 9 1

DTRB Double-Transceiver Unit Backplane 1 1

DAFU subrack

DCOM Combining Unit for DTRU BTS 3 0

DDPU Dual-Duplexer Unit for DTRU BTS 6 0

DFCU Filter Combiner Unit for DTRU BTS 3 0

DFCB Filter Combiner Unit for DTRU BTS 1 0

Fan subrack Fan box Fan Module 1 1


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BTS3012 Cabinet and Boards (for 36TRXs)Subrack Board/

ModuleFull Name Number of Boards or Modules

Configured in a Single Cabinet

FullConfiguration

In MinimumConfiguration

Commonsubrack

DTMU Transmission/Timing/Management Unit for DTRU BTS 2 1

DEMU Environment Monitoring Unit for DTRU BTS 1 0

DATU Antenna and TMA Control Unit for DTRU BTS 2 0

DPTU Packet Transmission Unit 2 0

DABB Abis Bypass Board for DTRU BTS 1 0

DCSU Combined cabinet Signal connection Unit for DTRU BTS 1 1

DCCU Cable Connection Unit for DTRU BTS 1 1DCMB Common Module Backplane for DTRU BTS 1 1

Set-on-topsubrack

DELC E1 Signal Lightning-Protection Card for DTRU BTS 3 1

DMLC Monitor Signal Lightning-Protection Card for DTRU BTS 1 0

DSAC Signal Access Card for DTRU BTS 1 1

DCTB Cabinet Top Backplane for DTRU BTS 1 1

QTRU subrackQTRU Quadruple-Transceiver Unit 6 1

DTRB Double-Transceiver Unit Backplane 1 1

DAFU subrack DDPU Dual-Duplexer Unit for DTRU BTS 3 1

Power subrack(only for thecabinet using+24 V DC power)

PSU Power Supply Unit 4 1

Fan subrack Fan box Fan Module 1 1


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Common Subsystem

DTMU Transmission/Timing/Management Unit for DTRU BTS

DEMU Environment Monitoring Unit for DTRU BTS

DCSU Combined cabinet Signal connection Unit for DTRU BTS

DCCU Cable Connection Unit for DTRU BTS DATU Antenna and TMA control Unit for DTRU BTS

DPTU Packet Transmission Unit (For 36 TRXs)

DABB Abis Bypass Board for DTRU BTS (For 36 TRXs)


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Comparison of Component Boards

For 12 TRXs For 18 TRXs For 36 TRXs

Component

Boards of

Common

Subsystem

DTMU DTMU DTMU

DEMU DEMU DEMU

DCSU DCSU DCSU

DCCU DCCU DCCU

DATU DATU DATU

ECMB DPTU

DABB


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Functions of DTMU

Provides external GPS inputs

Provides BITS synchronized clock inputs

Provides data backup between the active and standby boards Provides the 10 Mbit/s Ethernet port for maintenance

Supports four E1 inputs by default or eight E1 inputs if required

Controls, maintains, and operates the BTS

Downloads software for the BTS

Provides fault management, configuration management, performancemanagement, and security management

Provides centralized clock distribution and management of the entire BTS, and

the hot backup of the clock unit

Provides backup for the E1 ports and the main control unit

Provides eight digital alarm inputs, two of them being lightning arrester failurealarm inputs

Provides four extended digital control signal outputs

Monitors the external fan control board and the power modules


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Structure of DTMU

MCK

OML

DBUS

CBUS2

Clock

BIUDTRU

DTMU

BSC

MCUMMI

LMT

Abis

External

synchronized clock

Subrack number

and clock


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LEDs on the DTMU panel

RUN

ACT

PLL

LIU1

LIU2

LIU3

LIU4

SWT

ALM

RST

MMI

T2M

FCLK

T13M

DTMU

LED Color Description Status Meaning

RUN Green Operating

indicator of

the board

Slow flash (on for 2s and off

for 2s)

The OML is blocked.

Slow flash (on for 1s and offfor 1s) Normal

Fast flash at unfixed

intervals

The BSC is loading data.

Off There is no power input for the board.

ACT Green Active/stand

by status

indicator

Off Standby board

On Active board

PLL Green Clock status

indicator

Off The clock is abnormal.

On Free-run

Fast flash (on for 0.125s

and off for 0.125s)

Pull-in

Fast flash (on for 0.5s and

off for 0.5s)

Locked

LIU1 Green Transmissio

n statusindicator of

E1 port 1 or

port 5

Off E1 port 1 is normal when SWT is off.

E1 port 5 is normal when SWT is on.

On E1 port 1 near end alarm occurs when SWT is off.

E1 port 5 near end alarm occurs when SWT is on.

Fast flash (on for 0.125s

and off for 0.125s)

E1 port 1 remote end alarm occurs when SWT is off.

E1 port 5 remote end alarm occurs when SWT is on.


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LEDs on the DTMU panel

RUN

ACT

PLL

LIU1

LIU2

LIU3

LIU4

SWT

ALM

RST

MMI

T2M

FCLK

T13M

DTMU


LIU2 Green Transmission statusindicator ofE1 port 2 orport 6





Fast flash (on for 0.125s andoff for 0.125s)



















SWT Green Indicates thetransmissionstatus of E1links

When the DTMU supportseight E1 routes, the SWTstatus is slow flash (on for10s and off for 10s).

When the SWT is off, LIU1 to LIU4 indicate thetransmission status of E1 port 1 to 4.

When the SWT is on, LIU1 to LIU4 indicate thetransmission status of E1 port 5 to 8.

When the DTMU supportsfour E1 routes, the SWT LEDis always off.

LIU1 to LIU4 indicate the transmission status of E1 port 1to 4.

ALM Red Alarmindicator

Off No board alarm

On An alarm is generated.


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Ports on the DTMU panel

Port Type Function

T2M SMA female connector 2 MHz reference clock, used to test

and tune clock precision

FCLK SMA female connector 216.7 Hz frame clock

T13M SMA female connector 13 MHz reference clock, used to testand tune clock precision

MMI RJ45 connector Terminal maintenance port


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Functions of DEMU

The DEMU guarantees the normal operation of the BTS by monitoring the

surrounding environment.

The DEMU performs the following functions:

Monitors the environment information sent from the smoke sensor,

water sensor, temperature and humidity sensor, infrared sensor, and

door control sensor.

Collects alarm information and reports it to the DTMU.

Provides 6 Boolean value outputs and 32 Boolean value inputs.


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Functions of DCSU

The Combined cabinet Signal connection Unit for DTRU BTS (DCSU) is

placed in slot 5 of the common subrack. The DCSU is a mandatory

board. Only one DCSU can be configured.

The DCSU performs the following functions:

Transmits clock signals, data signals, and control signals between the

main cabinet and the extension cabinet.

Transmits the clock signals, data signals, and control signals from the

DTMU to the DTRU ( for BTS3012) or QTRUs ( for 36TRXs).

Transmits the in-position signals of the DCOM, DDPU, or DFCU in

the DAFU subrack to the DCMB. ( for BTS3012)

Transmits the in-position signals of the DDPU located in the DAFU

subrack to the DCMB. ( for 36TRXs).


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Ports on the DCSU panel

CC_IN

CC_OUT

TO_DTRB

TOP2

DCSU

Silk-

Screen

Type Description

CC_OUT MD64 female

connector

Connects with the cable for combined cabinets when

the cabinet serves as the main cabinet and connects

with the RF cable when the cabinet serves as the

extension cabinet

CC_IN MD64 female

connector

Connects with the RF cable when the cabinet serves

as the main cabinet and connects with the cable for

combined cabinets when the cabinet serves as the

extension cabinet

TO_DTRB MD64 female

connector

Connects to the DTRB through cables

TOP2 DB26 female

connector

Connects to the DCTB in the set-on-top subrack of the

BTS3012 cabinet through cables


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GM51DCSU VERBSW6

SW9

SW14

SW13

SW12

SW7

SW10

SW8

SW5

SW4

SW3

SW11

SW2

SW1

Switches of DCSU (for 12TRXs)


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Switches on DCSU Board

You can adjust the switches on the DCSU board as follow:

Master cabinet:

SW1-all ON

SW2~SW5-all ON

SW6~SW7-all OFF

SW8-all ONSW9-OFF ON ON ON

Others go as default.

Slave Cabinet:

SW1-all OFF

SW2~SW5-all ON

SW6~SW7-all OFF

SW8-OFF OFF ON ON

SW9-OFF ON ON ON

Others go as default.


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Functions of DCCU The DCCU is placed in slot 6 of

the DCMB in the common

subrack. The DCCU is amandatory board. Only one

DCCU can be configured.

The DCCU performs the

following functions:

Transfers E1 signals.

Transfers the control signals

for the fans.

Transfers the clock signals

from the DAFU subrack.

Processes the power inputs

through the EMI filter, and

then transmits the power to

the common subrack.


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Ports on the DCCU panel

POWER

DCCU

To_FAN

TO_TOP1

TRAN

Port Type Description

TRAN MD64 female

connector

Importing E1 signals

To_FAN DB26 female

connector

Connecting to the fan box through cables

TO_TOP1 MD64 female

connector

Connecting to the DCTB in the set-on-top

subrack of the BTS3012 through cables

POWER 3V3 power

connector

Importing power to the common subrack


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Functions of DATU

The DATU can be installed in slot 2, 3, 4, or 7 of theDCMB in the common subrack. The DATU is an

optional board. A maximum of two DATUs can be

configured.

The DATU performs the following functions:

Controls the RET antenna.

Provides power for the TMA over the feeder.

Reports alarms related to the control of the RET

antenna.Monitors the current from the feeder.

DATU

RUN

ACT

ALM

ANT0

ANT1

ANT2

ANT3

ANT4

ANT5


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Functions of ECMB (for 18TRXs)

The ECMB is the backplane for the common subrack and DTRU subrack 0. The

ECMB is a mandatory board. There are 10 slots on the ECMB.

The ECMB provides power and signal circuits for the boards in the common

subrack and DTRU subrack 0. The ECMB transmits signals from the boards in the

common subrack to the DCCU. The ports on the DCCU then transmit the signals

to the boards in other subracks. The ECMB transmits the in-position signals of the

DTRUs in DTRU subrack 0 to the DTMU.

The ECMB performs the following functions:

Provides signal circuits for connecting the boards in the common subrack.

Provides 48 V power circuits for the boards in the common subrack.

Provides bus connection between the common subsystem and the double-

transceiver subsystem.

Specifies the slot number and rack number of the DTRUs in DTRU subrack 0.

Transmits the in-position signals of the DTRUs in DTRU subrack 0 to the

DCCU.


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Functions of DPTU (for 36TRXs)

The DPTU is packet transmission unit. The DPTU is

mandatory. A maximum of two DPTUs can be configured. The

DPTU can be installed in slot 3 or 4 (from left to right) in the

common subrack. You can configure two DPTUs in

active/standby mode. When the DABB is configured, the DPTU

cannot be configured.

The DPTU performs the following functions:

Provides the interface for Abis over IP.

Provides the BTS with the convergence function of a Hub.

Provides the functionality of Clock Over IP.

Provides the functionality of transmission QoS.


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Working Environment of the DPTU (for 36 TRXs)

Working Environment of the DPTU in the BTS3012

The DPTU accesses external E1 signals.

The DPTU transmits E1 signals for the DTMU.


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Working Environment of the DPTU with Transmission Over IP

The DPTU accesses the transmission network through the

FE signal cable.

The DPTU transmits E1 signals through the BUS E1 cable.

The DPTU transmits and converges signals for the lower-

level BTS through E1 cable.



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Working Environment of the DPTU with HubBTS

The DPTU transmits E1 signals for the BTS main cabinet group

through BUS E1cable, and transmits E1 signals for the BTS

extension cabinet group through E1 cable.

The DPTU enables the BTS to be connected to the BSC in the form

of HDLC Over E1 or IP Over FE.

The DPTU enables the lower-level BTSs to be connected in theform of HDLC Over E1.



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LEDs on the DPTU panel


RUN Green Operatingindicator of

the board

Steady on The power input is normal,but the board is faulty.

Steady off There is no power supply

or the board is faulty.

Slow flash (on for 1s

and off for 1s)

The board is operational.

Slow flash (on for 2sand off for 2s) The board is being tested.

Fast flash (on for

0.125s and off for

0.125s)

The board is loading

software.

ACT Green Active/stand

by status

indicator

Steady off Standby board

Steady on Active board

ALM Red Indicates

whether

there are

alarms

Steady off No board alarm

On (including high-

frequency flash)

An alarm is generated.


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Ports on the DPTU panel

Port Type Function

FE0 RJ45 connector Connects the transmission equipment or the

BSC so that 100 Mbit/s signals can be

transmitted and received.FE1

E1/T1 TRAN MD64 female

connector

Receives eight E1 inputs

E1/T1 MS MD64 female

connector

Port for short-circuiting active and standby

DPTUs


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Functions of DABB (for 36TRXs)

The DABB is the bypass board for E1 signals. It is an optional board.

Only one DABB can be configured. When the DABB is configured, theDPTU cannot be configured.

The functions of the DABB include:

Bypass Function

In chain topology, when the BTS where the DABB is located is

power off, the DABB can immediately set up the connection

between BTSs. Thus, the services will not be disrupted. In chain

topology, the BSC can identify the transmission disruption and

BTS power failure.


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Functions of DABBfor 36TRXs

Terminal Loopback When the DABB is configured in the BTS of the lowest level in

chain topology, you can perform E1 loopback. When the BTS is

power off, you can set the DIP switch of the DABB to short-circuit

the transmission cable. In this way, you can perform remote

loopback on transmission cables to locate faults.

Function of Bypass Board In Position Report

The DABB provides the DTMU with DABB type and in-position

information of the DABB. Thus, the DTMU can determine the

assignment mode of the OML timeslots.


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Working Environment of the DABB (for 36 TRXs)

Working Environment of the DABB in the BTS3012

When the BTS3012 is working normally, the DABB transfers

E1 signals for the DTMU.


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Working Environment of the DABB With Bypass Function

The figure below shows the working environment of the

DABB when the BTS3012 is working normally.



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Working Environment of the DABB With Bypass Function

When the BTS3012 is power off, the DABB supports the bypassfunction to transfer E1 signals so that the upper-level BTS and

lower-level BTS can be connected.

The figure below shows the working environment of the DABB when

the BTS3012 is power off.



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Working Environment of the DABB With Terminal Loopback Function

When the DABB is configured the lowest level in the chain topology,

you can perform terminal loopback on the DABB through DIP switch

so that the transmission path between the BTSs can be formed.



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LEDs on the DABB panel


PWR Green Power

indicator

Steady on The power supply to the DABB is

normal.

Steady off The DABB is power off.

ACT Green Statusindicator

Steady on The E1 cable is not bypassed.

Steady off The board is bypassed.

TEST Red Test indicator Steady on The key TEST is pressed.

Steady off The key TEST is not pressed.


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Ports on the DABB panel

Port Type Function

TRAN MD64 female connector Importing E1 signals


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Relation between boards and slot numbers

Board Slot No.

DTMU Slots 0 and 1

DEMU Slots 2, 3, 4,or 7

DATU Slots 2, 3, 4,or 7

DCSU Slot 5

DCCU Slot 6

DPTU (for 36TRXs) Slots 3 and 4

DABB (for 36TRXs) Slots 2, 3, 4,or 7


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Signal Protection Subsystem

DMLC (Monitor Signal Lightning-Protection Card for DTRU BTS)

DELC (E1 Signal Lightning-Protection Card for DTRU BTS)

DSAC (Signal Access Card for DTRU BTS)

D

M

L

C

D

E

L

C

D

E

L

C

D

S

A

C

DCF

CKB2

CKB

1


53/138


Functions of DMLC

The DMLC is configured in slot 0, 1, or 2 of the set-on-

top subrack. The DMLC is an optional board, which is

used with the DEMU. Only one DMLC is required in

full configuration.

The DMLC performs the following functions:

Provides lightning protection for Boolean input and

output signals.

Provides lightning protection for analog signals that

are transmitted from the smoke sensor, water

sensor, door control sensor, infrared sensor,humidity and temperature sensor.

SWIN

SWOUT

DMLC

AIN


54/138


Functions of DELC

The DELC is configured in slot 0, 1, or 2 of the set-

on-top subrack. These three slots are shared bythe DELC and DMLC. The DELC is a mandatory

board. At least one DELC should be configured.

The DELC provides lightning protection for 4 routes

of E1 signals. A maximum of three DELCs can be

configured to provide lightning protection for 12

routes of E1 signals.

The DELC performs the following functions:

Provides lighting protection for E1 signals.

Transmits E1 signals to the DCCU, through

which the signals are sent to the DTMU for

processing.

DELC

TR


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Functions of DSAC

The DSAC is placed in slot 3 of the set-on-top subrack.

The DATU is a mandatory board. Only one DSAC is

required in full configuration.

The DSAC performs the following functions:

Provides six Boolean alarm inputs.

Provides two CBUS3 signal outputs.

Provides two lightning protection arrester failure

alarm inputs of the power supply.

Provides lightning protection for BITS clock signals.

DSAC

COM1

EAC

SYN

C

COM2

S1+S1-S2+S2-


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Double transceiver subsystem (BTS3012)

DTRU (Double Transceiver Unit)

DTRB

F ti f DTRU (BTS3012)


57/138


Functions of DTRU (BTS3012)

Baseband Processing Part

Processes the signaling, such as coding, decoding, interleaving, de-

interleaving, modulation, and demodulation.

Supports RF loop test and switchover when loop test of phase-lock fails.

Amplifies the output power.

RF Transmitting Part

Demodulates the RF signals into baseband signals, and performs

frequency hopping.

Divides the received RF signals and performs receive diversity.

RF Receiving Part

Demodulates the RF signals into baseband signals, and performs

frequency hopping.

Divides the received RF signals and performs receive diversity.


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Functional structure of DTRU (BTS3012)

DTRU Baseband and RF Unit (DBRU) DTRU Power Amplifier Unit (DPAU)

DTRU Power Supply Unit (DTPS)

DTMU

DTPS

DTRU

- 48V DC

DPAU

DBRU

DAFU

Panels on DTRU (BTS3012)


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Panels on DTRU (BTS3012)

There are two types of

DTRU: type A and typeB. The four LEDs on

the DTRU panel

indicate the operating

status of the DTRU

and other functionalsubsystems.

DTRU (type A) has 10

ports and DTRU (type

B) has 8 ports. These

ports exchanges

signals with the RF

front-end subsystem.DTRU panel (type A) DTRU panel (type B)


60/138


LEDs on the DTRU panel

LED Color Description Status Remarks

RUN Green Operating andpower-onindicator of theDTRU

On There is power supply. However, the module isfaulty.

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

Slow flash (on for 2 sand off for 2 s)

The module is starting.


The module works normally.

Fast flash (on for 0.2s and off for 0.2 s)

The DTMU is issuing configuration data to theDTRU.

ACT Green Operatingindicator of thetransceiver

On The DTRU is operating. (The DTMU issuingconfiguration data normally and the cells starts) Allthe channels on the two TRXs operate normally.

Off The communication between the DTRU and theDTMU is not established.


A part of logical channels work normally (beforeand after TRX mutual aid).

ALM Red Alarm indicator On (including high-frequency flash)

Critical alarm (The module is faulty.)

Off The module is normal.

RF_IND Red RF indicator On There is voltage standing wave radio (VSWR)alarm.

Off Normal


There is a radio link alarm.

Ports on DTRU (type A) panel


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Ports on DTRU (type A) panel

Port Type Remarks

TX1 N femaleconnector

It is the output port for the signals from TRX1.

In transmit independency or transmit diversity mode, the TX port routes the signalsto the TX port of the module in the RF front-end subrack.

In PBT or wideband combination mode, the TX1 port routes the signals to the IN1port.

IN1 SMA femaleconnector

In PBT or wideband combination mode, the IN1 port is short-circuited with the TX1port.

TCOM N femaleconnector

In PBT or wideband combination mode, the TCOM port is used to output thecombined signals from the IN1 and IN2 ports.

IN2 SMA femaleconnector

In PBT or wideband combination mode, the IN2 port is short-circuited with the TX2port.

TX2 N female

connector

It is the output port for the signals from TRX2.

In transmit independency or transmit diversity mode, the TX port routes the signalsto the TX port of the module in the RF front-end subrack.

In PBT or wideband combination mode, the TX2 port routes the signals to the IN2port.

RXM1 SMA femaleconnector

In receive independency or receive diversity mode, it is the input port for the mainRF signal.

In 4-way receive diversity mode, it is the input port for the diversity signal 1.

RXD1 SMA femaleconnector

In receive independency or receive diversity mode, it is the input port for thediversity RF signal.



In receive independency mode, it is the input port for the main RF signal.



In receive independency mode, it is the input port for the diversity RF signal.


PWR 3V3 powerconnector

Power input port


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Ports on DTRU (type B) panel

Port Type Remarks

TX1 N female connector It is the output port for the signals from TRX1.

In transmit independency or transmit diversity mode, the TX port routes thesignals to the TX port of the module in the RF front-end subrack.

In PBT or wideband combination mode, this port is suspended.

TCOM N female connector In PBT or wideband combination mode, the TCOM port is used to output thecombined signals from the TX1 and TX2 ports.

TX2 N female connector It is the output port for the signals from TRX2.

In transmit independency or transmit diversity mode, the TX port routes thesignals to the TX port of the module in the RF front-end subrack.

In PBT or wideband combination mode, this port is suspended.


In receive independency or receive diversity mode, it is the input port for themain RF signal.



In receive independency or receive diversity mode, it is the input port for thediversity RF signal.



In receive independency mode, it is the input port for the main RF signal. In 4-way receive diversity mode, it is the input port for the diversity signal 3.


In receive independency mode, it is the input port for the diversity RF signal.


PWR 3V3 powerconnector

Power input port


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DTRU transmit modes

Transmit independency

Transmit diversity

PBT

Wideband combination


64/138


DTRU transmit mode-transmit independency

TCOM

TRX0

TX

TRX1

TX

TX1

IN1

IN2

TX2

RXM1

RXD1

RXM2

RXD2

combiner

DTRU t it d t it di it


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DTRU transmit mode-transmit diversity

TRX1

TRX0

TX

TX

TX1

IN1

TCOM

IN2

TX2

Man made multi way

combiner

DTRU t it d PBT


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DTRU transmit mode-PBT

TRX1

TRX0

TX

TX

TX1

IN1

TCOM

IN2

TX2

Same phase

combiner

DTRU t it d id b d bi ti


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DTRU transmit mode-wideband combination

TRX0

TX

TRX1

TX

TX1

IN1

TCOM

IN2

TX2

combiner

DTRU i d


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DTRU receive modes

Receive independency

Receive diversity

4-way receive diversity

DTRU i d R i i d d


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DTRU receive mode- Receive independency

TRX1

TRX0

TX

TX

TX1

IN1

TCOM

IN2

TX2

RXM1

RXD1

RXM2

RXD2

divider

combiner

divider

DTRU i d R i di it


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DTRU receive mode- Receive diversity

TRX0

TX

TRX1

TX

TX1

IN1

TCOM

IN2

TX2

RXM1

RXD1

RXM2

RXD2

combiner

divider

divider

DTRU i d 4 i di it


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DTRU receive mode- 4-way receive diversity

TRX0

TX

TRX1

TX

divider

divider

TX1

IN1

TCOM

IN2

TX2

RXM1

RXD1

RXM2

RXD2

combiner

Intra structure of DTRU


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Intra structure of DTRU

TRX0

TX

TRX1

TX

TX1

IN1

TCOM

IN2

TX2

RXM1

RXD1

RXM2

RXD2

combiner

divider

divider

Functions of DTRB (BTS3012)


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Functions of DTRB (BTS3012)

The DTRB is placed in the DTRU

subrack. The DTRB provides six slots

to house the DTRUs.

The DTRB connects the DCSU with the

DTRU.

The DTRB performs the following

functions:

Provides bus connection between

the common subsystem and the

double-transceiver subsystem.

Specifies the slot number and racknumber of the DTRU.

Transmits the in-position signals of

the DTRUs to the DCSU.

BTS3012 Multi Transceiver Subsystem (for 36TRXs)


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BTS3012 Multi-Transceiver Subsystem (for 36TRXs)

The functions of the BTS3012 multi-transceiver subsystem areperformed by the QTRU subrack. These functions are the signal

modulation and demodulation and power amplification.

QTRU (Quadruple-Transceiver Unit)

DTRB (Double-Transceiver Unit Backplane)

Functions of the BTS3012 Multi-Transceiver Subsystem (for 36 TRXs)


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The multi-transceiver subsystem transmits RF signals, receives RF

signals, and processes baseband signals.

The transmitting part of the RF signals performs the following functions:

Modulates the baseband signals into RF signals and performs up-

conversion, filtering, and radio frequency hopping.

Amplifies RF signals.

The receiving part of the RF signals performs the following functions:

Performs down-conversion and radio frequency hopping.

Receives RF signals.

The baseband processing part performs the following functions:

Processes the signaling, such as coding, decoding, interleaving, de-

interleaving, modulation, and demodulation.

Supports voice and fax services.

Supports Phase II data services, GPRS services, and EDGE services.

y ( )

Functions of QTRU (for 36TRXs)


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The QTRU is placed in the multi-transceiver subsystem of the BTS. One

QTRU provides one to six TRXs.

The QTRU functionally consists of the baseband processing part, RF

transmitting part, and RF receiving part.

Baseband Processing Part

Processes signaling, coding and decoding, interleaving and de-

interleaving, modulation and demodulation.

Supports RF loop test.RF Transmitting Part

Modulates the baseband signals into RF signals and performs up-

conversion, filtering, DA conversion, and RF hopping.

Amplifies downlink signals.

RF Receiving Part

Amplifies uplink signals.

Modulates the RF signals into baseband signals and performs

down-conversion, filtering, AGC controlling, and DA conversion.

Working Environment of the QTRU


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Working Environment of the QTRU

The working environment of the QTRU is as follows:

Receives clock signals, control signals, and data signals from the

DTRB.Modulates the baseband signals into RF signals, and then transmits

the RF signals to the DAFU subrack through RF signal cables.

Receives RF signals from the DAFU subrack, and then demodulates

the RF signals into baseband signals.

LEDs on the QTRU panel


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p

LED Color Description Status Description

RUN Green Operatingand power-on indicatorof the QTRU

On There is power supply. However, the module isfaulty.


Slow flash (on for2s and off for 2s)

The module is starting.

Slow flash (on for1 second and offfor 1 second)


Fast flash (on for0.2s and off for0.2s)

The DTMU is issuing configuration data to the QTRU.

ACT Green Operating

indicator ofthetransceiver

On The QTRU is operating. (The DTMU issuing

configuration data normally and the cells starts) Allthe channels on the TRXs operate normally.

Off The communication between the QTRU and theDTMU is not established.


A part of logical channels work normally (before andafter TRX mutual aid).

ALM Red Indicateswhetherthere are

alarms

On (includinghigh-frequencyflash)

Critical alarm (The module is faulty.)

Off The module is normal.

RF_IND Red RF indicator On There is voltage standing wave radio (VSWR) alarm.

Off Normal


There is a radio link alarm.

Ports on the QTRU panel


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p


TX N female connector It is the output port for the signals.

RXM SMA female connector Input port for the main RF signal

RXD SMA female connector Input port for the diversity RF signal

PWR 3V3 power connector Power input port

RF Transmit Mode/Receive Mode


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The QTRU supports one TX signal and two RX signals at the same time, asshown in the above figure.

The signals from multiple TRXs are transmitted from one RF output port.

Two receive signals serve as the main and diversity of each TRX.

Functions of DTRB (for 36TRXs)


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Functions of DTRB (for 36TRXs)

The DTRB performs the following

functions:

Provides bus connection between

the common subsystem and the

transceiver subsystem.

Specifies the slot number and rack

number of the QTRUs.

Transmits the in-position signals of

the QTRUs to the DCSU.

The DTRB is placed in the QTRU subrack. The DTRB provides six slots to

house the QTRUs.

DTRB board provides connection between the DCSU with the QTRUs. All

the in-position signals of the QTRUs are transmitted to the DCSU through

the DTRB.


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RF Front-End Subsystem (BTS3012)

The functions of the BTS3012 RF front-end subsystem are

performed by the boards in the DAFU subrack.

The DAFU subrack can be configured with the DDPU, DCOM,

DFCU, DFCB, or the combination of these modules.

DDPU (Dual Duplexer Unit for DTRU BTS)

DCOM (Combining Unit for DTRU BTS)

DFCU (Filter Combiner Unit for DTRU BTS)

DFCB (Filter Combiner Unit for DTRU BTS)

Functions of DDPU (BTS3012)


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Functions of DDPU (BTS3012)

The DDPU is configured in the DAFU subrack with the DCOM. The

DDPU is an optional module. You can choose to configure DDPUor DFCU. Generally, three DDPUs are configured. If the DCOM is

not configured, a maximum of six DDPUs can be configured.

The DDPU performs the following functions:

Provides lightning protection through the ANT port.

Detects VSWR alarms in the antenna system.

Receives the gain control signals for the low noise amplifier.

Transmits multiple routes of RF signals from the transmitter to

the antenna.Receives signals from the antenna, amplifies and quarters these

signals, and then transmits them to the receiver of the DTRU.

Functional structure of the DDPU


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LEDs on the DDPU panel


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LEDs on the DDPU panel

RUN

ALM

VSWRA

RXA1

RXA2

RXA3RXA4

RXB1

RXB2

RXB3

RXB4

DDPU

TXA

TXB

COM

POWER

VSWRB

ANTA

ANTB


RUN Green Operatingand power-

on indicatorof the DDPU

On There is power supply. However, the module is faulty.


Slow flash(on for 1sand off for 1s)


Fast flash(on for 0.2sand off for0.2s)

The DTMU is issuing configuration data to the DDPUor the DDPU is loading software programs.

ALM Red Alarmindicator

On (includinghigh-frequencyflash)

Alarms (including VSWR alarm). This indicates thatthere are faults.

Off No alarm


The DDPU is starting or loading the latest application.

VSWRA Red VSWR alarmindicator forchannel A


There is a VSWR alarm with channel A.

On There is a critical VSWR alarm with channel A.

Off There is no VSWR alarm with channel A.

VSWRB Red VSWR alarmindicator forchannel B


There is a VSWR alarm with channel B.

On There is a critical VSWR alarm with channel B.

Off There is no VSWR alarm with channel B.

Ports on the DDPU panel


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Ports on the DDPU panel

RUN

ALM

VSWRA

RXA1

RXA2

RXA3

RXA4

RXB1

RXB2

RXB3

RXB4

DDPU

TXA

TXB

COM

POWER

VSWRB

ANTA

ANTB


COM DB26 female connector Receiving control signals, communication signals, and clock signalsfrom the DCTB of the BTS3012

POWER 3V3 power connector Power input port

TXA N female connector It is the imput port for the signals received from the TX1 or TX2port from the DTRU.

TXB N female connector

It is the input port for the combined signals from the TCOM port ofthe DTRU.

It is the input port for the combined signals from the TX-COM portof the DCOM.

RXA1

SMA female connector It is the output port for the main RF signal received from the ANTAport. It is connected to the RXM1, RXD1, RXM2, or RXD2 port on theDTRU panel.

RXA2RXA3

RXA4

RXB1

SMA female connectorIt is the output port for the diversity RF signal received from theANTB port. It is connected to the RXM1, RXD1, RXM2, or RXD2 porton the DTRU panel.

RXB2

RXB3

RXB4

ANTA

DIN female connector

Antenna port for reception and transmission

It is the input port for the RF signals received from the antenna.

ANTB

It is the output port for the RF signals transmitted from the TXAport of the DDPU.

It is connected to the indoor 1/2-inch jumper of the BTS3012 or tothe Bias-Tee.


87/138


Functions of DCOM (BTS3012)

The DCOM is placed in the DAFU subrack. Itcan be inserted in the DAFU subrack with the

DDPU.

The DCOM is optional and up to three

DCOMs can be configured. The precondition

for configuring the DCOM is that the wideband

combination function in the DTRU must be

used when there is an additional requirements

for the combination of signals.

The DCOM combines two routes of TXsignals from the DTRU, and then sends them

to the DDPU.

DCOM

TX-COM

TX2

TX1

ONSHELL


88/138


Ports on the DCOM panel


ONSHELL DB26 female connectorIt exports the in-position signals of the

DCOM to the DCTB of the BTS3012.

TX-COM N female connectorIt is the output port for the signals combined

from the TX1 and TX2 ports of the DCOM.

TX1 N female connectorIt is the input port for the combined signals

from the DTRU to the DCOM.TX2 N female connector

Functions of DFCU (BTS3012)


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( )

The DFCU is located in the DAFU subrack of the RF front-end subsystem.

The DFCU is optional. The BTS3012can be configured with the DDPU

or the DFCU.

The DFCU performs the following functions:

Transmits multiple routes of RF TX signals from the DTRU transmitter

to the antenna through the duplexer after combination.

Transmits the received signals from the antenna to the duplexer and

to the low noise amplifier (The DFCU also controls the gain of the

amplifier), divides the signals into several routes, and transmits them

to the receivers of the DTRUs.

Provides four-in-one signal combination or six-in-one signal

combination once connected with the DFCB.

Detects the frequencies of the input signals and performs automatic

tuning.

Detects the VSWR alarms of the antenna system and provides the

function of the VSWR alarms whose thresholds are adjustable.

Functional structure of the DFCU


90/138


Functional structure of the DFCU

LEDs on the DFCU panel


91/138


LEDs on the DFCU panel


RUN Green Power

indicator

On There is power input.

Off There is no power input.

VSWR Red VSWR alarm

indicator of

the

TX/RX_ANT

port

On There is a level 2 VSWR alarm.

Slow flash(on for 1 s

and off for

1 s)

There is a level 1 VSWR alarm.

Off There is no VSWR alarm.

LNA Red LNA alarm

indicator

On There is an LNA alarm.

Off There is no alarm.

TUNING Red Tuning failalarm

indicator

On There is a tuning failure alarm.

Slow flash

(on for 1 s

and off for

1 s)

Tuning


Ports on the DFCU panel


92/138



TX/RX-ANT 7/16 DIN female connector

Antenna port for reception and transmission


It is the output port for the RF signals transmitted from the TX-DUP port.

RXD-ANT 7/16 DIN female connector Diversity receive antenna port

DBUS DB26 female connector Input/output port for DBUS signals

DC-IN 48 V 3V3 power connector DC power input port

TX-COM N female connectorCombination output port for the signals transmitted from the TX1, TX2, TX3,TX4, and COM-IN ports; It is connected to the TX-DUP port.

TX-DUP N female connectorInput port for the RF signals from the duplexer; It is connected to the TX-COM port.

COM-IN N female connectorExtended combination port; It is connected to the output port of the RF

signals from the DFCB.TX1

N female connectorInput port for the RF signals; It is connected to the TX1 or TX2 port on theDTRU panel.

TX2

TX3

TX4

RX1

SMA female connectorIt is the output port for the RF signals received from the TX/RX-ANT port. Itis connected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.

RX2

RX3

RX4

SMA female connector

It is the output port for the RF signal received from the HL-IN port. It isconnected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.

RX5 If the HL-IN port connects with the RXD-OUT port, it serves as theoutput port for the diversity RF signals received by the RXD-ANT.

RX6 If the HL-IN port connects with the HL-OUT port, it serves as the outputport for the RF signals received by the TX/RX-ANT port.

Ports on the DFCU panel


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p


HL-OUT SMA female connector Output port for high-level signals; It can be connected to the

HL-IN port.

HL-IN SMA female connector Input port for the high level signals; It is connected to the HL-OUT or RXD-OUT port.

RXD-ANT SMA female connector Output port for the diversity received signals; When the RXD-

ANT is used, the RXD-OUT is connected to the HL-IN port.

PR out1 SMA female connector Reverse power sampling output port 1; It is connected to the

PR in1 port.

PR out2 SMA female connector Reverse power sampling output port 2; It is connected to the

PR in1 or PR in2 port on the DFCB panel.

PF out1 SMA female connector Forward power sampling output port 1; It is connected to the

PF in1 port.

PF out2 SMA female connector Forward power sampling output port 2; It is connected to the

PF in1 or PF in2 port on the DFCB panel.

PR in1 SMA female connector Reverse power sampling input port 1


PF in1 SMA female connector Forward power sampling input port 1


Functions of DFCB (BTS3012)


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The DFCB is located in the DAFU subrack of the RF front-end subsystem. It is

an optional module. The BTS3012can be configured with the DDPU or the

DFCU/DFCB.

The DFCB receives the UL signals from the antenna, divides the signals, and

then sends the signals to the DTRU. It also receives DL signals from the DTRU,

filters and amplifies the signals, and then sends the signals to the antenna. The

DFCB must be connected with the DFCU.

The DFCB performs the following functions:

Combines one route or two routes of RF TX signals from the transmitter of

the DTRU , and then transmits them to the antenna through a duplexer.

Transmits the received signals from the antenna to the duplexer and LNA

(The DFCU also controls the gain of the amplifier), divides the signals into

several routes, and then transmits them to the receivers of the DTRUs.

Detects the VSWR alarms of the antenna system and provides the function

of the VSWR alarms whose thresholds are adjustable.

Functional structure of the DFCB


95/138


LEDs on the DFCB panel


96/138


LEDs on the DFCB panel


RUN Green Power indicator On There is power input.

Off There is no power input.

VSWR Red VSWR alarm

indicator of the

TX/RX_ANT

port

On There is a level 2 VSWR alarm.

Slow flash

(on for 1 s

and off for 1 s)

There is a level 1 VSWR alarm.

Off There is no VSWR alarm.

LNA Red LNA alarmindicator

On There is an LNA alarm.


TUNING Red Tuning fail

alarm indicator

On There is a tuning failure alarm.

Slow flash(on for 1 s

and off for 1 s)

Tuning


Ports on the DFCB panel


97/138


Port Type Function

TX/RX-ANT 7/16 DIN female connector Antenna port for reception and transmission


It is the output port for the RF signals transmitted from the TX-DUP port.RXD-ANT 7/16 DIN female connector Diversity receive antenna port

DBUS DB26 female connector Input/output port for DBUS signals

DC-IN 48 V 3V3 power connector DC power input port

COM1 N female connector It is the output port for the signals combined from the TX1 and TX2 ports.

TX-DUP N female connector Input port for the RF signals from the duplexer; It is connected to the COM1 orCOM2 port.

COM2 N female connector It is the output port for the signals combined from the TX3 and TX4 ports.

TX1 N female connector Input port for the RF signals; It is connected to the TX1 or TX2 port on theDTRU panel.

TX2

TX3

TX4

RX1 SMA female connector It is the output port for the RF signals received from the TX/RX-ANT port. It isconnected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.

RX2

RX3

RX4 SMA female connector It is the output port for the RF signal received from the HL-IN port. It isconnected to the RXM1, RXD1, RXM2, or RXD2 port on the DTRU panel.

RX5 If the HL-IN port connects with the RXD-OUT port, it serves as the outputport for the diversity RF signals received by the RXD-ANT.

RX6 If the HL-IN port connects with the HL-OUT port, it serves as the output portfor the RF signals received by the TX/RX-ANT port.

Ports on the DFCB panel


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p

Port Type Function

HL-OUT SMA female connector Output port for high-level signals; It can be connected to the HL-IN port.

HL-IN SMA female connector Input port for the high level signals; It is connected to the HL-OUT or

RXD-OUT port.

RXD-ANT SMA female connector Output port for the diversity received signals; When the RXD-ANT is

used, the RXD-OUT is connected to the HL-IN port.

PR out1 SMA female connector Reverse power sampling output port 1

PR out2 SMA female connector Reverse power sampling output port 2

PF out1 SMA female connector Forward power sampling output port 1

PF out2 SMA female connector Forward power sampling output port 2





BTS3012 RF Front-End Subsystem (for 36TRXs)


99/138


y ( )

The functions of the BTS3012 RF front-end subsystem are performed by

the modules in the DAFU subrack. These functions are transmit/receive

duplex, low-noise amplification of receive signals, and related control

functions.

The functions of the RF front-end subsystem are performed by the

DDPUs in the DAFU subrack.

DDPU (Dual-Duplexer Unit for DTRU BTS)

Functions of the BTS3012 RF Front-End Subsystem (for 36TRXs)


100/138


The BTS3012 RF front-end subsystem duplexes the received signals and

the signals transmitted from the TRX, combines the signals for

transmission, divides the received signals, and amplifies the receivedsignals with the LNA.

The RF front-end subsystem performs the following functions:

Combines multiple routes of RF TX signals for transmission

Transmits and receives signals through a duplexer

Detects and reports antenna Voltage Standing Wave Ratio (VSWR)

alarms and low noise amplification alarms

Controls the low noise amplification gain

Detects and reports the transmit power on the antenna ports

Detects and reports the temperature of the boards

Detects whether a board is in position

Supports online software upgrade

Functions of the Fan Box


101/138


The fan box forms a loop with the air inlet box to provide forced ventilation

and dissipation for the common subrack, DTRU subrack, and DAFU

subrack. The fan box performs the following functions:

Monitors the temperature at the air inlet of the cabinet and the

temperature in the fan subrack, and then adjusts the speed of the fans.

Communicates with the DTMU to adjust the speed of the fans andreport alarms.

FANSTATE

COMPWR

LEDs on the fan box


102/138


LED Color Status Description

STATE Green Fast flash (on for

0.125 s and off

for 0.125 s)

The NFCB communicates with the

DTMU abnormally. There is no alarm.

Red Fast flash (on for

0.125 s and off

for 0.125 s)

An alarm is generated.

Green Slow flash (on for

1 s and off for 1 s)

The board operates normally.

Orange (red

and green)

On The software of the board is being

upgraded.

Green or red

or orange

Off There is no power supply or the board

is faulty.


103/138


Chapter 1 Overview




Signal Flow of the BTS3012


104/138


The BTS3012 signal flow is associated with the traffic and

signaling of the BTS.

The BTS3012 signal flow consists of:

DL traffic signal flow

UL traffic signal flow

Signaling processing signal flow

Signal flow for cabinet groups

DL Traffic Signal Flow of the BTS3012


105/138


DL Traffic Signal Flow The DL traffic signal flow is as follows:


106/138


The DL traffic signal flow is as follows:

The BSC sends E1 signals to the DELC through E1 cables.

The DELC provides lightning protection for the received E1 signals, and then

sends the E1 signals to the DCTB. The DCTB sends the E1 signals to the DCCU through the TOP signal cable

connecting the DCTB with the DCCU/DSCU.

The DCCU sends the E1 signals to the DTMU through the ECMB.

On receiving the signals, the DTMU converts the E1 signals through the DBUS.

The DTMU also assigns the data based on the data configuration on the OML.

Then, the signals are sent to the DCSU and the DTRUs in DTRU subrack 0through the ECMB.

The DCSU sends the signals to the DTRB in DTRU subrack 1 through the signal

cable between the DCSU and the DTRB.

The DTRB sends the signals to the DTRUs in DTRU subrack 1.

After receiving the signals, the DTRUs in the two DTRU subracks perform digital

filtering, up-conversion, and filter amplification, and then send the signals to theDDPU/DFCU/DFCB.

The duplexer in the DDPU/DFCU/DFCB filters the signals from the DTRU, and

then sends the signals to the antenna subsystem for transmission.

UL Traffic Signal Flow of the BTS3012


107/138


UL Traffic Signal Flow


108/138


The UL traffic signal flow is as follows:

The antenna receives the signals from the MS. After being amplified by the

TMA, the signals are transmitted to the DDPU/DFCU/DFCB through the

feeder. The TMA is optional. It is used to compensate the feeder loss and

enhance receive sensitivity of the DDPU/DFCU/DFCB antenna port.

The DDPU/DFCU/DFCB receives the UL signals and transmits the signals

to the DTRUs in the two DTRU subracks after they are filtered by theduplexer and amplified by the lower noise amplifier (LNA).

The DTRU in DTRU subrack 1 receives the signals from the

DDPU/DFCU/DFCB and transmits the signals to the DTRB after

amplification and down-conversion.

The DTRB sends the signals to the DCSU.

UL Traffic Signal Flow


109/138


The DCSU sends the signals to the DTMU through the ECMB. In

addition, the DTRU in DTRU subrack 0 receives the signals from the

DDPU/DFCU/DFCB, and transmits the signals to the DTMU through the

ECMB after amplification and down conversion.

The DTMU backs up the E1 signals and converts the E1 signals

through the DBUS. The DTMU then sends the converted signals to the

DCCU through the ECMB.The DCCU sends the signals to the DCTB through the TOP signal

cable connecting the DCTB with the DCCU/DSCU.

The DCTB sends the signals to the DELC.

The DELC provides lightning protection for the signals. Then, it sendsthe signals to the BSC through the E1 cables.

Signaling Flow of the BTS3012


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Signaling processing flow

The signaling processing flow is as follows:

The BSC sends the signaling data to the DTMU of the BTS.

After processing the signaling, the DTMU sends the signaling to the

DTRU and DDPU (DFCU or DFCB).

The DTRU and DDPU (DFCU or DFCB) report their board status to

the DTMU.

The DTMU obtains the status of the BTS3012 by collecting and

analyzing the states of all the boards. Then, it transmits the

information to the BSC through the Abis interface.

Signal Flow of BTS3012 Cabinet Groups


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The signal flow of BTS3012 cabinet groups refers to the signal flow

between the main cabinet group and the extension cabinet groups.

The signal flow of cabinet groups involves clock signals and control

signals.

Bus connection between BTS3012cabinet groups is shown as

follows:

Clock Signals


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DTMUBoards in main

cabinet

Boards in slave

cabinet

A-bis

Clock distribution

cable betweencabinets

Clock Signals Description


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The clock signal flow includes the following steps:

The external reference clock is transmitted to the clock

module in the DTMU through the Abis interface

The clock module performs phase lock and frequency

division on the clock signals to generate different clock

signals for BTSs

The clock signals are transmitted to the modules in the

main cabinet such as the DTRU and the DDPU

The clock signals are transmitted to the modules in the

slave cabinets through the clock distribution cable

Control Signals


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The control signals refer to the CBUS1 signals, which are

responsible for the communication between the DTMUs in the

main and extension cabinet groups.

Control Signals Description


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The processing of CBUS1 signals is as follows:

The DTMU in the cabinet of the main cabinet group transmits

the CBUS1 signals to the cabinets in the extension cabinet

groups, through signal conversion of relevant boards.

The cabinets in the extension cabinet groups transmit the

CBUS1 signals to the DTMUs in those cabinets, through signal

conversion of relevant boards.

Signal Flow of the BTS3012 (for 36TRXs)


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The BTS3012 (for 36TRXs) signal flow consists of the traffic flow and

signaling flow of the BTS.

The BTS3012 (for 36TRXs) signal flow consists of :

DL traffic signal flow

UL traffic signal flow

Signaling flow

Signal flow of combined cabinets and cabinet groups

DL Traffic Signal Flow of the BTS3012 (for 36TRXs)


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DL traffic signal flow (for 36TRXs)



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The BSC sends E1 signals to the DELC through E1 cables.

The DELC provides lightning protection for the E1 signals, and then sends the

E1 signals to the DCTB.

The DCTB sends the signals to the DPTU.

The DPTU sends the signals to the DTMU through the DCMB.

The DTMU receives the signals from the DPTU and then converts those signals

through the data bus (DBUS) on the DCMB. The DTMU also assigns the data

based on the data configuration on the OML. The signals are then sent to the

DCSU through the DCMB.

The DCSU sends the signals to the DTRB.

The DTRB sends the signals to the QTRU.

After receiving the signals, the QTRU performs digital filtering, up-conversion,

filtering and amplification, and then sends the signals to the DDPU.

The duplexer in the DDPU filters the signals from the QTRU, and then sends

the signals to the antenna subsystem for transmission.

UL Traffic Signal Flow of the BTS3012 (for 36TRXs)


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UL traffic signal flow (for 36TRXs)


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The UL traffic signal flow is as follows:

The antenna receives the signals from the MS. After being amplified bythe TMA, the received signals are transmitted to the DDPU through the

feeder.

NOTE:The TMA compensates the feeder loss and enhances the

receiver sensitivity at the antenna port of the DDPU. The TMA is

optional.

The DDPU receives the UL signals, performs signal filtering and low-noise

amplification, and then transmits the signals to the QTRU.

The QTRU receives the signals from the DDPU, demodulates and

amplifies the signals, performs down-conversion, and then transmits the

signals to the DTRB.

UL traffic signal flow (for 36TRXs)


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The DTRB sends the signals to the DCSU through the signal cable

between the DTRB and the DCSU.

The DCSU sends the signals to the DTMU through the DCMB.

The DTMU backs up the E1 signals and converts the E1 signals through

the DBUS on the DCMB. The DTMU then sends the converted signals to

the DPTU through the DCMB.

The DPTU sends the signals to the DCTB.

The DCTB sends the signals to the DELC.

The DELC provides lightning protection for the signals. Then, it sends the

signals to the BSC through the E1 cables.

Signaling Flow of the BTS3012 (for 36TRXs)


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g g ( )

Signaling Flow (for 36TRXs)


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The signaling flow is as follows:

The BSC sends the signaling data to the DTMU in the BTS.

After processing the signaling, the DTMU sends the signaling to the

QTRU and DDPU.

The QTRU and DDPU report their board status to the DTMU.The DTMU obtains the status of the BTS3012 by collecting and

analyzing the states of all the boards. Then, it transmits the

information to the BSC over the Abis interface.

Signal Flow of BTS3012 Combined Cabinets and Cabinet Groups (for 36TRXs)


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The signal flow of the BTS3012 cabinet groups refers to the signal flow

between the main cabinet group and the extension cabinet groups. The

signal flow of combined cabinets refers to the signal flow between the

main cabinet and the extension cabinet in one cabinet group. The signal

flows of the combined cabinets and cabinet groups involve clock signals,

data signals, and control signals. The three types of signal flow are

transferred over the signal cables for the combined cabinets and cabinet

groups.

The signal flow associated with combined cabinets and cabinet groups

is as follows:

The signals between the main cabinet and the extension cabinet

consist of the data signals, control signals, and clock signals.

The signals between the main cabinets belonging to different cabinet

groups consist of the clock signals and control signals.

Signal Flow of BTS3012 Combined Cabinets and Cabinet Groups (for 36TRXs)


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The figure below shows the bus connection between BTS3012

combined cabinets and cabinet groups.


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Configure the BTS3012 according to the following principles:

Use a minimum number of antennas.

Use a minimum number of cabinets.

Configure all the TRXs that belong to one synchronized cell in one

cabinet group.

Adhere to the following principles when configuring the BTS3012 cabinets:

If less than 18 TRXs are required in the synchronized cells of a site, use

one cabinet to configure the site.

If more than 18 TRXs are required in the synchronized cells of a site, use

cabinet groups to configure the site.

Configuration Features for the BTS3012


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The BTS3012 has the following features in terms of configuration:

Supports omnidirectional cell coverage and directional cell coverage

Supports the grouping of three cabinets

The RF TX mode supports wideband combining, PBT, transmit diversity,

and non-combining. The DTRU connected to the DFCU does not support

the wideband combining mechanism.

The RF RX mode supports the receive diversity, independent receive,

and four-way receive diversity.

Typical Configuration of One BTS3012 Cabinet S2/2/2


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The right figure shows

the cabling of RF cables

in an S2/2/2 cell. The

RF TX cable is blue, the

RF RX cable is red, and

the combining short-

circuiting signal cable isblack.

Typical Configuration of One BTS3012 CabinetS6/6/6


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The right figure shows

the cabling of RF cables

in an S6/6/6 cell.

Typical Configuration of BTS3012 Cabinet Groups


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Configuration of the DTMU

All the cabinets should be configured with the DTMUs when thecabinet groups are used.

Configuration of the DTRU/DDPU/DCOM/DFCU/DFCB

In an S4 or a smaller site, use the DDPU.

In S5-S8 sites, use the DDPU+DCOM combination mode or theDFCU.

In S9-S18 sites, use the DDPU+DCOM or DFCU+DFCB

combination mode.

Configuration Principles and Features for the BTS3012 (for 36TRXs)


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Configure the BTS3012 according to the following principles:

Use a minimum number of antennas.Use a minimum number of cabinets.

Configure all the TRXs that belong to one synchronized cell in one

cabinet group.

The BTS3012 has the following features in terms of configuration:

One QTRU supports one to six TRXs.

Supports omnidirectional cell coverage and directional cell coverage.

The RF TX mode supports the transmit independency mode.

The RF RX mode supports the receive independency mode.

Typical Configuration of One BTS3012 Cabinet S6/6/6 (for 36TRXs)

5 huawei bts3012 hardware structure

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