GSM BTS312 Hardware Structure potx

 Provide E1 connection interface  Provide channel multiplexing and flexible networking modes  Provide Man-machine interface MMI and operation & maintenance link  Provide centralize

GS M BTS312

Ha rdwa re S tructure

Obje ctive s

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

 Know the functions and features of BTS

 Master the BTS hardware structure

 Master the signal processing of BTS

Re fe re nce s

Loca tion

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 ControllerAUC: Authentication Center

PSTN ISDN PSPDN

MS

MS

Fe a ture s a nd Functions

(15:1)

topologies,

Fe a ture s a nd Functions

Ca bine t a nd Boa rds

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 Extension Power

Supply Unit

FAN BOX

SWITCH BOX FAN BOX

AIR 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 M U

T E 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

T R X

T R X

T R X

T R X

C D U

C D U

TDU

 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

EAC

Indictors on TMU

Indic ato r

Name Co lo r Me aning Explanatio n No rmal S tate

PWR Green Power On: Normal

RUN Green Running State Flash(0.5Hz): Normal

On or Off: Abnormal Flash LI1,2,3,4 Green E1 Transmission

On: Local Alarm Flash: Remote Alarm Off: Normal

Off

M/S Green Master/Slave indication Slow flash(1HZ): Master

Quick flash(2Hz): Slave

Master Board:

Slow flash Slave Board:

Slow flash

TMU

MMI T13M FCK T2M

DBG RST

PWR

M/S

RUN LI1 LI2 LI3 LI4 PLL

 Provide clock channels in one synchronous cell

 Provide alarming channels

 Provide bus-control interfaces

Position of TDU

Ca bine t-top Conne ctors

(1) Data bus

interfac e (DCF1)

(2) External alarm interfac e (EAC1 and EAC2) (3) 120Ω E1

interfac e (TME1)

(4) Built-in o ptic al trans mis s ion E1 interfac e (TRA1, TRA2, TRB1, and TRB2)

(7) Data bus interfac e (DCF2)

(8) 75Ω E1 interfac e (TX and RX)

(9) External

s ync hronous c loc k interfac e (SYNC)

(10) Grounding c able interfac e for c o mbined c abinet (SHELLGND)

 When the supply input is 220VAC,the AC/DC

module is used

DC/DC nor AC/DC module is used

Powe r S upply S yste m

AC/DC (DC/DC) module

Monitoring unit PMU

Anti-lightning

Power

distribution

EMI filter

AC/DC (DC/DC) module

AC/DC (DC/DC) module

AC/DC (DC/DC) module EMI

filter

PS U Configura tion

(TRX)

Boards (PS U)

PMU s truc ture

 Baseband speech processing

 Um and Abis interface signaling processing

 Modulation and demodulation

 RF signal amplification

TRX Module S tructure

Transmitter DBUS

TBPU:TRX Baseband signal Processing Unit RPU:RF signal Processing Unit

SCP: Signaling Processing Unit DSP: Digital Signal Processing

Unit CUI: Carrier Unit Interface TDP: Transmitter Driver and PLL Unit PAU: Power Amplifier Unit RCU: Receiving Unit

Output Powe r of TRX

Ala rms of TRX

 When the standing wave ratio at the power amplifier output port exceeds 1.5, it reports standing wave alarm to the

baseband unit

 When the temperature of the power amplifier exceeds 85℃, the power amplifier unit reports the over-temperature alarm via the baseband unit, and automatically turns off the power

amplifier

TX OUT

PWR RCP RDP FAIL RST

MMI

RXA IN RXB IN

TRX

 Combine and filter transmitted signals

 Filter ,amplify and distribute received signals

 Provide power for the tower-top amplifier

 Alarm detection

Indica tors on CDU

Indic ato r

Name Co lo r Me aning Explanatio n No rmal S tate

POWER Green Power On: Normal

Off: Abnormal On

VSWR1 Yellow Standing wave ratio

alarm

On: VSWR is greater than 1.5 and less than 2.5

Off

Re a r Pa ne l of CDU

MAIN: TTA power feeding selection knob of main receiving channel

DIVERSE: TTA power feeding selection knob of diversity receiving channel

S e tting MAIN DIVERS E Unit

Ala rm De te ction

 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 amplifier fault alarm: The signal is extracted from the power supply current of the low noise amplifier When the current exceeds a certain level ,alarm signals are generated

 Tower-top amplifier alarm: When there is a tower-top amplifier on service, the CDU monitors the status of tower-top amplifier by its working current If the current exceeds a certain level , alarm

signals are generated

S CU

and the insertion loss is 6.8dB

Tx_Comb

TX4 TX3 TX2 TX1

3dB Bridge

3dB Bridge

3dB Bridge

Conte nts

 Overview

 System Components

 Sig nal Proc e s s ing

 Antenna and Feeder System

S pe e ch Proce ssing

DBUS

S C P

C U I

Clock process

TBPU

D S P

OML Proce ssing

DBUS

S C P

C U I

Clock process

TBPU

D S P

RS L P roce ssing

DBUS

S C P

C U I

Clock process

TBPU

D S P

Clock Proce ssing

DBUS

S C P

C U I

Clock process

TBPU

D S P

P S U

U D C U D C U D C U D C

U D C U D C

U

M P

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T

P S U

U D C U D C U D C U D C

U D C U D C

U

M P

X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T

P S U

U D C U D C U D C U D C

U D C U D C

U

M P

U

M

T U

R

T X

R

T X

R

T X

R

T X

R

T X

R

T X

R

T

Extension cabinet group

Basic cabinet Basic cabinet Basic cabinet group

TBUS Conne ction

Ca bine t Exte nsion Ca bling

for resistance termination

extension cabinet group

CKB1

CKB2

DCF1 DCF2 DCF1 CKB1 CKB2 DCF2 DCF1 CKB1 CKB2 DCF2 DCF1 CKB1 CKB2 DCF2

Extension Cabinet Basic Cabinet Basic Cabinet Extension Cabinet

Basic Cabinet Group Extension Cabinet Group

E1 External E1 Interface External E1 Interface

Ante nna a nd Fe e de r S yste m

Antenna

TTA

Antenna stand Jumper between antenna and TTA

Jumper between TTA and feeder

Feeder

Lightening arrester

Jumper between lightening arrester and 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

TX/RX ANTTX

(RXA)CDU

RxM RxD

Distributor

Distributor Distributor

Tx TRx4

RxM RxD

Tx TRx5

RxM RxD

Lightning Arre s te r is us ed to pre ve nt the e quipme nt from

be ing damage d by the lig htening current induc te d

by the co re line of the fe eder

Feeder

J umper

Lightning Arre ste r

Lightning Arrester

 Used between the antenna and the main feeder

 Between the antenna and the tower-top amplifier

 Between the cabinet and the lightning arrester

TTA (Optiona l)

antenna

simplex TTA duplex TTA triplex TTA

Low noise amplifier

TX filter

bypass Bias Tee

Ante nna P a tte rn

antennas in all directions

360¡ ã

120¡ ã 90¡ ã 65¡ ã

Pola riza tion

 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

Thank you

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