This is a PPT for my BSNL industrial training, in this PPT you know about BSNL Structure, TOWERS and BTS.

2. 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.

3. OVERVIEW OF COMPONENTS

4. 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.

5. FUNCTION OF BSC
The Main functions of the BSC are:
1. Administration of BSS resources
2. Supervision of the BTS
3. Connection handling of mobile stations
4. Locating and handover
5. Administration of paging
6. Transmission network management
7. Operation and maintenance of the BSS

6. 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.

7. BTS

8. 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.

10. BTS VISIT
BTS HAS A MAIN SECTIONS :
1. POWER SECTION
2. POWER PLANT
3. BTS MACHINE
4. TOWER & ANTENNA

11. POWER SECTION
POWER SUPPLY IS GET FROM THREE WAYS :
1. GEB LINE
2. GENERATOR
3. BATTERYS

12. POWER PLANT

13. BTS MACHINE

14. BTS MACHINE MAIN PARTS
BTS Divided in to following Parts:
1. POWER CARDS
2. BB2F
3. TRX
4. BOIA CARD
5. ALARM EXTENSION SYSTEM
6. RRI CARD
7. COUPLER
8. DUPLEXER

15. BB2F CARDS

16. BB2F CARDS
Function 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 - Ok
2. red- Faulty

17. 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

18. BOIA CARDS

19. 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

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

21. • 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

22. • 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

23. • 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

24. • Tower is used to give height
to antenna.
• Height of tower is 40m to 75m.
TOWER & ANTENNA

25. • 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