BHRAT SANCHAR

NIGAM LIMITE

D

A N I ND U S T R I A

L TR A I N

I NG

BSNL• Bharat Sanchar Nigam Limited (abbreviated

BSNL) is an Indian state-owned telecommunications company headquartered in New Delhi. It was incorporated on 15 September 2000 and took over the business of providing of telecom services and network management from the erstwhile Central Government Departments of Telecom Services (DTS) and Telecom Operations (DTO).

• with effect from 1 October 2000 on a going concern basis. It is the largest provider of fixed telephony and broadband services with more than 60% market share and Fifth largest mobile telephony provider in India.

OVERVIEW OF COMPONENTS

BSC• The Base Station Controller (BSC) controls

and supervises the radio resources in the Base Transceiver Station (BTS).

• Together with the BTS, the BSC constitutes the Base Station System (BSS), responsible for the management and cell configuration data of the radio network.

FUNCTION OF BSCThe Main functions of the BSC are:1. Administration of BSS resources2. Supervision of the BTS3. Connection handling of mobile stations4. Locating and handover5. Administration of paging6. Transmission network management7. Operation and maintenance of the BSS

BTS• A Base transceiver station (BTS) is a piece of

equipment that facilitates wireless communication between user equipment (UE) and a network.

• . UEs are devices like mobile phones (handsets), WLL phones, computers with wireless Internet connectivity. The network can be that of any of the wireless communication technologies like GSM, CDMA, wireless local loop, Wi-Fi, WiMAX or other wide area network(WAN) technology.

BTS

MSC• The Mobile switching Centre (MSC) is the

primary service delivery node for GSM/CDMA, responsible for routing voice calls and SMS as well as other services (such as conference calls, FAX and circuit switched data).

• Alternatively MSS is also called an MTS-U (Motorola telephony soft-switch) in Motorola terminology and as MSC-S in Ericsson terminology.

SITE VISIT

T O W E R VI S

I T

BTS VISIT

BTS HAS A MAIN SECTIONS :1. POWER SECTION 2. POWER PLANT3. BTS MACHINE4. TOWER & ANTENNA

POWER SECTIONPOWER SUPPLY IS GET FROM THREE WAYS :1. GEB LINE2. GENERATOR3. BATTERYS

POWER PLANT

BTS MACHINE

BTS MACHINE MAIN PARTSBTS Divided in to following Parts:1. POWER CARDS2. BB2F3. TRX4. BOIA CARD5. ALARM EXTENSION SYSTEM6. RRI CARD7. COUPLER8. DUPLEXER

BB2F CARDS

BB2F CARDSFunction of BB2F in BSNL BTS is digital signal

processing and also Frequency hopping. One BB2F can operate 2 TRX. There are two condition of BB2F which is

detected by leads…1. green - Ok2. red- Faulty

TRX is Equipment which handles calls of user.

• One TRX can handle 8 calls per second.

• We can use maximum 12 TRX on one BTS.

• It is depend on bb2f card which maximum value is 6.

TRX

BOIA CARDS

BOIA CARDS

• BOIA(Base Operation and Interface unit) card is used for software Programming.

• BOIA card is like brain of BTS.• There are serial port in it for connect it to

laptop.• The BOIA card in the BTS is for maintaining

the total functionality of the BTS. It consists of a local management port(LMP) through which a system can be connected with Others

It collects working status of various units BTS and extend them to Operation & Maintenance (o & m) Monitoring Stations.

ALARM EXTENSION MANAGER

• RRI card is used for connection of ODU (outdoor unit).

• This antenna is used for microwave link which connect one BTS to other BTS.

RRI CARDS

• When we use more than two TRX then it is require to coupler and then it connect with Duplexer.

• One combiner is used to handle two TRX.

MULTI COUPLER

• Duplexer is a device which is used in BTS to use same antenna for Transmission as well as receiver.

• Antenna has two cable one for TX & RX which connect with Duplexer.

DUPLEXER

• Tower is used to give height to antenna.

• Height of tower is 40m to 75m.

TOWER & ANTENNA

• There two antenna is used in BTS :• One for transmission & reception of user’s

signals which is called GSM antenna. • Second antenna is microwave antenna which

is used to get & forward link from other BTS.• Second antenna is also called as drum

antenna.

ANTENNA