ULTRA SITE BASE STATION OVERVIEW

CONTENTS :• Ultra BTS structure.• Various units , cards and there

functions.• Ultra BTS cabling and connections.• Ultra BTS commissioning .• Drawbacks.

Power Supply• DC (1-3) • AC (1-2)TRX BB units (1-6)

TRX RF units• GSM (0-12)• EDGE GSM (0-12)

Receiver Multicouplers

• 2-way (0-6)• 6-way (0-2)

Base Operations and Interface Unit (1)

Transmission Units (1-4)

Combiners & Duplex Filters•duplexer(upto6)•Combiner:•(2 way)&(6 way)

NOKIA ULTRA BTS

POWER CARDS :• The function of power card is to take -48v and

distribute it to various other minor cards.PWSA(AC type)PWSB/PWSC(DC type)• There are 3 power cards.• One power card support 6TRX cards thus 2

power cards will support 12TRX. (1 card is always for stand by)

TRX BASE BAND UNIT :

BB2F FUNCTIONS :

• It is known as status card for TRX cards.• It is basically a DSP(digital signal

processor).• One BB2F card take care of two TRX

cards.• BB2F card should be in order for proper

operation of TRX.

BOIA UNIT :

3 colour status LED

TDMA frame clock

Monitor Interface

Site Reset

Local Management Port

13 MHz

BOIA UNIT FUNCTIONS :• It is known as Brain of BTS.• It handles all the control functions like :BTS initiallizationOperation & MaintainanceSoftware download(LMP port available)Management of alarmsLogic controlMain clock function

TRANSMISSION UNITS :• Transmission cards is basically a interface for

E1/T1 patching.• Different types of transmission cards: • FC E1/T1• FXC E1/T1• FXC E1• FC RRI• FXC RRI

FC E1/T1:

3 colour status LED

RX (75 )TX (75 )

TX/RX (100 /120 )

FXC E1 Transmission Unit3 colour status LED

IF1 TXIF1 RX

IF2 TXIF2 RX

IF3 TXIF3 RX

IF4 TXIF4 RX

FXC E1/T1 Transmission Unit3 colour status LEDIF1 TX/RX

IF2 TX/RX

IF3 TX/RX

IF4 TX/RX

FXC RRI Transmission Unit

3 colour status LED

Flexbus 2

Flexbus 1

Power LED Flexbus 2

Power LED Flexbus 1

TRX CARDS :

Front view

TRX CARDS :• One BTS support maximum 12 TRX cards.• TRX card functionality is both transmit and receive.• One TRX card perform modulation , demodulation

and amplification for one RF carrier.• Handles both downlink and uplink signal.• It basically transmit and receive without any Digital

Signal Processing.• TRX card depend on BB2F card for DSP.

DUPLEXER FUNCTIONS:•Performs duplex operation of both TX & RX into one antenna.•Provide filtering and amplification for both main and diversity signal from antenna.•It contains LNA(low noise amplifier) for amplification.

MULTICOUPLER:• It performs signal splitting for both main and

diversity signal.• Multicoupler is of two types:

2- way 6- way

• One multicoupler handles two TRX cards.

2 WAY MULTICOUPLER:

COMBINERS :• It combines two transmitting signals of TRX

card and generate one output.• Combiners are of two types :

2 – way (wide band combiner)6 – way (remote tune combiner)

2-WAY & 6-WAY COMBINER:

99614773

CABLING :• For configuration (4+3+1) : TRX CARDS : “8”PWSB CARDS : “3” BB2F CARDS : “5” BOIA CARD : “1” DUPLEXER : “3” MULTICOUPLER : “5”(2-WAY) COMBINER : “3”(2-WAY)

SECTOR 1

SECTOR 2

SECTOR 3

SHARING CONCEPT :• Consider configuration “3+3”TRX CARDS : “6”PWSB CARDS : “2” BB2F CARDS : “4” BOIA CARD : “1” DUPLEXER : “1”(SHARED) MULTICOUPLER : “4”(2-WAY) COMBINER : “4”(2-WAY)

COMMISSIONING :• Commissioning is a process of making a BTS

ready for operational use.• There are three steps for commissioning

Nokia BTS : Hardware configurator . Software downloader. Hub Manager.

DRAWBACKS :

• Ultra BTS support only 2G technology.• Ultra BTS support maximum 12TRX.• Ultra BTS has all the pin connections on

the back plane. If any of the pin of a particular slot is damaged then that slot becomes useless.