gsm bts312 hardware structure

7/30/2019 gsm bts312 hardware structure

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GSM BTS312

Hardware Structure


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Location

MS: Mobile Station BTS: Base Transceiver Station

OMC: Operation and Maintenance Center

HLR: Home Location Register EIR: Equipment Identity Register

MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center

VM: Voice Mailbox

BSC: Base Station Controller

AUC: Authentication Center

PSTN

ISDN

PSPDN

Um Interface

BTS

BTS

BTS

BTS

OMC

HLR/AUC/EIR

BSC

MSC/VLR

SMC/VM

A Interface

MAPMAP

TUP,ISUPMS

MS

MS


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Features and Functions

High integration and low power consumption

15 radio carriers at the Abis sharing an E1 for

transmission (15:1)

Support various transmission modes and complex

topologies,

e.g. SDH, E1, microwave, satellite etc.

Support the configuration of up to S24/24/24 and

facilitating expansion

1-minute fast startup


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Features and Functions

Support

GSM900,DCS1800,EGSM and

RGSM

Support GSM PHASE 1PHASE

2 and PHASE 2+

Support GPRS and EDGE

Support baseband hopping and


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Boards in Cabinet:

CDU: Combiner & Divider Unit

TRX: Transceiver

PMU: Power Monitoring Unit

TMU: Timing/Transmission &

Management Unit

PSU: Power Supply Unit

TDU: Time Distribution Unit

TES: Transmission ExtensionPower Supply Unit

TEU: Transmission Extension

Unit

Cabinet and Boards

FAN BOX

SWITCH BOXFAN BOX

AIR BOX

AIR BOX

PSU

PSU

PSU

PSU

PSU

PSU

PMU

TMU

TES

TEU

TMU

TEU

TRX

TRX

TRX

TRX

CDU

CDU

TRX

TRX

TRX

TRX

CDU

CDU

TRX

TRX

TRX

TRX

CDU

CDU

TDU


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Chapter 1 Overview

Chapter 2 System Components

Chapter 3 Signal Processing

Chapter 4 Antenna and Feeder System


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Chapter 2 System Componnents

Section 1 Common Unit

Section 2 Signal Processing Unit


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TMU

Provide E1 connection interface

Provide channel multiplexing and flexible

networking modes

Provide Man-machine interface (MMI) and

operation & maintenance link

Provide centralized BTS clock

Provide alarm signal input ports

Functions of TMU


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Indictors on TMU

IndicatorName

Color Meaning Explanation Normal State

PWR Green PowerOn: Normal

Off: AbnormalOn

RUN Green Running StateFlash(0.5Hz): Normal

On or Off: AbnormalFlash

LI1,2,3,4 GreenE1Transmission

On: Local Alarm

Flash: Remote AlarmOff: Normal

Off

M/S GreenMaster/Slaveindication

Slow flash(1HZ): Master

Quick flash(2Hz): Slave

Master Board:Slow flash

Slave Board: Quickflash

PLL Green Phaseidentificationindicator

On: Free oscillation

Quick flash(4Hz):Catching

Slow flash(1Hz): Locked

Off: Abnormal

Slow flash

TMU

MMI

T13M

FCK

T2M

DBG

RST

PWR

M/S

RUN

LI1

LI2

LI3

LI4

PLL


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TDU

Provide clock channels in one synchronous

cell

Transfer E1 signals in the local cabinet

Provide alarming channels

Provide bus-control interfaces

Functions of TDU


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Power Supply System

AC/DC

(DC/DC)module

Monitoringunit PMUAnti-lightning

Power

distribution

EMIfilter

DC contacter

Battery group Fuse

220VAC IN-48VDC IN+

-

+24VDC IN+- 26VDC OUT

Load

EMIfilter

AC/DC

(DC/DC)module

AC/DC

(DC/DC)module

AC/DC

(DC/DC)module

EMIfilter


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PSU Configuration

modeCapacity

(TRX)Boards(PSU)

Boards(PMU)

notes

24VDC 1 ~ 12 0 1

-48VDC 1 ~ 3 2 1

One PSUfor

backup

4 ~ 6 3 1

7 ~ 9 4 1

10 ~ 12 5 1

220VAC 1 ~ 3 3 1

4 ~ 6 4 1

7 ~ 9 5 1

10 ~ 12 6 1


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PMU structure

PMU

AC/DC AC/DC AC/DC

AC power supply

Power monitoring

unit PMUFanFuseBattery

Load

AC/DC


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FMU

Fan feeding

Fan revolution speed control

Alarm detection

+24V power supply input

interface

Functions of FMU


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TRX

Baseband speech processing

Um and Abis interface signaling

processing Modulation and demodulation

RF signal amplification

Functions of TRX


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CDU

Combine and filter transmitted

signals

Filter ,amplify and distribute received

signals

Provide power for the tower-top

amplifier

Alarm detection

Functions of CDU


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Alarm Detection

VSWR (Voltage Standing Wave

Ratio) monitoring: CDU Monitors

the status of antenna system.When the detected standing

wave ratio exceeds the preset

threshold (1.5 or 2.5), CDU will

generate corresponding alarms

Low noise am lifier fault alarm:


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Antenna and Feeder System

Antenna

TTA

Antennastand

Jumper betweenantenna and TTA

Jumper betweenTTA and feeder

Feeder

Lighteningarrester

Jumper betweenlightening arresterand cabinet

BTS312

cabinet

SWITCH BOX

FAN BOX

AIR BOX

P

S

U

P

S

U

P

S

U

P

S

U

P

S

U

P

S

U

P

M

U

T

M

U

T

E

S

T

E

U

T

E

U

C

D

U

C

D

U

T

R

X

T

R

X

T

R

X

T

R

X

C

D

U

C

D

U

T

R

X

T

R

X

T

R

X

T

R

X

C

D

U

C

D

U

TDU

FAN BOX

AIR BOX

P

S

U

P

S

U

P

S

U

P

S

U

P

S

U

P

S

U

P

M

U

T

R

X

T

R

X

T

R

X

T

R

X


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Lightning Arrester is used to

prevent the equipment from

being damaged by the

lightening current inducted

by the core line of the feeder

feeder

jumper

Lightning Arrester

Lightning Arrester


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Types of Main Feeder

7/8 inch

Cable loss=0.043dB/m

5/4 inch Cable loss=0.032dB/m

1/2 inch jumper Cable loss=0.11dB/m

Used between the antenna and the

main feeder


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Antenna Pattern

The antenna pattern describes theradiating abilities of antennas in alldirections

360

Omni Antenna Directional antenna

120 90 65


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Polarization

Two main types of polarization

Vertical polarization

Horizontal polarization

The types of antenna divided by polarization

Single polarized antenna

Vertical polarization for GSM

One port for one feeder

Dual polarized antenna

+45 degree and -45 degree

Two ports for two feeders


23/23

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gsm bts312 hardware structure