bharat sanchar nigam

8/7/2019 BHARAT SANCHAR NIGAM

1/22

BHARAT SANCHAR NIGAMLIMITED

(BSNL)


2/22

PROFILE OF THE COMPANYS

BUSINESS

Basic And Limited Mobile Telephone

ServicesCellular Mobile Telephone Services

Internet Services

Broadband Services

Intelligent Services


3/22

THE MAIN BSNL PRODUCTS

WLL ----- Wireless In Local Loop

ISDN ----- Integrated Service Digitel NetworkLeased Line

MLLN Services ------ Managed Leased Line

NetworkIN ----- Intelligent Network

MPLS ----- Multiprotocol Label Switching


4/22

BSNL WLL

WLL and GSM (mobile services Providers) canprovide full mobility telecom services, but WLLis used for limited services.

It is configured as an augmentation of LandlineTelephony through Regulatory procedures.

WLL is sometime also called Radio In TheLoop.

WLL is a derivative of Cellular Mobile System


5/22

WLL can be implemented by adopting most ofthe cellular systems, e.g. Macro CellularSystem like GSM, CDMA, DECT and PHS.

In India CDMA and Cor-DECT are being usedfor WLL applications.


6/22

BSNL ISDN

BSNL ISDN provides an integration of Audio, Video andData.

With ISDN there are two connections:

Basic Rate Access (BRA):

- 128 Kbps line, i.e. with two 64 Kbps line Primary Rate Access (PRA): - 2 Mbps link


7/22

BSNL LEASED LINE

Leased line is used for high speed

connectivity.

Leased line is a dedicated Data Circuit

Link on point-to-point basis


8/22

BSNL IN (Intelligent Network)

IN provides a framework to create variousservices in a centralized place independent ofthe switch.

IN calls are first routed to nearest ServiceSwitching Point (SSP) which consults Service

Control Point (SCP).Popular IN services are: Free phone services,Premium Rate Services,India TelephoneCard,Virtual Private Network.


9/22

BSNL MOBILECurrently the widely used version of GSM is2G (2nd Generation) with its value addition

through 2.5G and 2.75G Mobile system.

2.5G Mobile is known as GPRS (GeneralPacket Radio Services)

2.75G Mobile is known as EDGE (EnhancedData Rate for GSM Evolution)

3G Mobile has been recently launched byBSNL.


10/22

CDMA AN INTEGRAL PART OF

CELLULAR TECHNOLOGY

CDMA means Code Division Multiple Access

Users occupy the same time and frequencyallocation.

Channelized through Uniquely DesignedCodes.

Signals are separated at the receiver by usinga correlator.

CDMA system uses effective Power ControlProcess.


11/22

ADVANTAGES OF CDMA

Fast network deployment.

Reduced service interruptions.

Low maintainance and operational cost.

Better system coverage flexibility.

Higher Capacity.

Easy transition to mobile services.


12/22

GLOBAL SYSTEM MOBILE

(GSM)

GSM is a radio communication system

Here the coverage area is broken into anumber of sub-areas called cell.

A number of cells are grouped togetherto form a clusture.

A coverage area may be viewed as acollection of clustures.

RF pairs are distributed among the cellsof a clusture.

Each member cell of the clusture getsunique set of RFs.


13/22

GENERAL FEATURES OF

GSMInternational roaming

High Spectral efficiency.

High link integrity.

High degree of flexibility.

Easy interfacing with other networks.

Wide range of services.

Reliable performance.

User friendly system.


14/22

WIRED TECHNOLOGIES

Leased Line

Optical fibre


15/22

LEASED LINE

A leased line is a symmetric telecommunicationline connecting two locations.

Leased line can be used for Telephone, Data orInternet services.

Unlike traditional PSTN lines it does not have a

telephone number.

Leased line is a must for large organizations inmost situations.


16/22

ADVANTAGES OF LEASEDLINE

It provide permanent, reliable and high speedconnectivity.

The quality of connection is far superior to whatis normally available through Dial Up.

Since the access is always on, it is possible toassociate a pool of permanent IP addresses

with a particular leased line.


17/22

OPTICAL FIBRE

Optical fibre is a new medium inwhich information is transmittedthrough a glass or plastic fibre in

the form of light.The sequence of transmission is:

Information is encoded intoelectrical signal.

Electrical signals areconverted into light signals.

Light travels down the fibre.

A detector changes the lightsignals into electical signals.

Electrical signals are decodedto get the information.


18/22

ADVANTAGES OF FIBREOPTICS:

Optical fibres are non conductive (dielectric).

Electromagnetic immunity.

Large bandwidth.

Low loss.

Small and light weight cables.

Available in long length.Security.

Universal medium.


19/22

PULSE CODE MODULATION(PCM)

PCM is a Digital scheme for transmitting analogdata.

PCM is used to transmit information over longdistances with hardly any distortion.

Using PCM it is possible to digitize all form of

analog data, including full-motion video, voices,music etc.

The output of a PCM is a series of binary numberseach represented by a power of 2-bits.


20/22

In PCM, the modulatingwaves are continuous.

PCM can be used to

combine 30 analogsignals to a singlechannel.


21/22


22/22

THANKS

bharat sanchar nigam

Documents