BSNL Broadband Plan_ Seminar

8/9/2019 BSNL Broadband Plan_ Seminar

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BSNL Broadband Plan1

abhinav prasad gupta


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Outline:

Introduction

VPNs

ADSL Technology

References

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Introduction:

Broadband service in BSNL is given by two ways, one is

wireless Virtual Private Networks(VPNs) and the other is

wired Asymmetric Digital Subscriber Line (ADSL).

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VPN:

Virtual Private Network is a type of private network that

uses public telecommunication, such as the Internet,

instead of leased lines to communicate.

It has two connections, one is made to the Internet and thesecond is made to the VPN.

Datagrams contains data, destination and sourceinformation.

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It has main functions as follows:

1. Authentication

2. Access control

3. Confidentiality4. Data Integrity

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There are mainly two types of VPNs:

Customer Premises Equipment (CPE)VPNs:

1. PPTP -- Point-to-Point Tunneling Protocol

2. L2TP -- Layer 2 Tunneling Protocol

3. IPsec -- Internet Protocol Security

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Provider Provisioned (PP) VPNs:

1. Layer 2 MPLS VPNs.

2. Layer 3 MPLS VPNs.

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Architecture of VPN:

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In VPNs, "tunneling" is the encapsulation of packets

inside packets of a different protocol to create and

maintain the virtual circuit.

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Advantages of VPN:

1. Eliminating the need for expensive long-distance leased

lines.

2. Reducing the long-distance telephone charges forremote access.

3. Transferring the support burden to the service providers.

4. Less Operational costs.

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MPLS VPN:

Security is the responsibility of service providers

(BSNL) MPLS Network.

Simple Network Implementation

Easy to configure & Manage.

QoS, and better Traffic management.

Easy Network Expansion at Customer Premises.

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ADSL: asymmetric digital subscriber line

This technology allows copper telephone line to be used

to provide a broadband connection.

ADSL uses a different set of frequencies, it does notinterfere with telephone conversation.

Telephone and Internet access can be used together usingthis technology.

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ADSL: asymmetric digital subscriber line

ADSL is an asymmetric technology i.e. transmit

asymmetric data stream

Up to 20Mb/s downstream to the subscriber(typically 2Mb/s)

Up to 1 Mb/s upstream back (typically 100 Kb/s)

ADSL provides high speed downloads i.e.

35 times faster than that of normal dial-up

connection

about 16 times faster than that of ISDN connection

about 16 times faster than that of DIAS connection.

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Framing of ADSL data

The data of the ADSL is organized into FRAMES and

SUPERFRAMES.

One SF is built of 68 ADSL Frames and one Sync

Frame.

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The Sync Frame is used to provide SF sync,

identification of START of The SF.

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Fast Byteused for special SF related processing Functions

Fast DataTX time sensitive info, it can vary in length

FEC -- Used to ensure accuracy of FAST DATA

Interleaved Data.. User data Tx by ADSL or Internet data, it can

vary in length

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ADSL Setup

Copper telephone line

A splitter - or microfilter - allows a single telephone

connection to be used for both broadband service and voice

calls at the same time.

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ADSL COMMUNICATION

Currently, most ADSL communication is full-duplex .

Full-duplex ADSL communication is usually achieved

on a wire pair by either frequency division duplex(FDD), echo-cancelling duplex (ECD), or time-division

duplexing (TDD).

FDD uses two separate frequency bands, referred to as

the upstream and downstream bands.

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ADSL COMMUNICATION

Red area is the frequency range used by normal voice

telephony (PSTN)

Green (upstream) and blue (downstream) areas are used forADSL

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ADSL COMMUNICATION

The upstream band is used for communication from the

end user to the telephone central office.

The downstream band is used for communicating from thecentral office to the end user.

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References:

http://www.flaisdn.com/adsl.html

www.bsnl.co.in

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http://www.flaisdn.com/adsl.htmlhttp://www.bsnl.co.in/http://www.bsnl.co.in/http://www.bsnl.co.in/http://www.flaisdn.com/adsl.htmlhttp://www.flaisdn.com/adsl.html

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BSNL Broadband Plan_ Seminar