Intro to Brod Band

8/8/2019 Intro to Brod Band

1/25

INTRODUCTION TO BROADBAND


2/25

DEFINITION OF BROADBAND

Broadband connectivity as defined in

Broadband policy-2004 is an always-on data

connection that is able to support interactive

services including Internet access and has the

capability of minimum download speed of 256

kbps to an individual subscriber from the POP

of the service provider


3/25

Broadband Services

High speed Internet Access

Video on demand

Interactive Games Share market dealing & personal banking

News, travel & leisure information

Music/Movie download

Chatrooms & newsgroups


4/25

E-mail & instant messaging

Personal websites and online magazines

Educational materials & research resources Tele-medicine

Work at home

Internet radio


5/25

Advantages of Broadband

Always on

Fast

No disconnection No additional access charge

Telephone and Data simultaneously

Fat pipe has to be continuously supplementedwith value added application to enjoy the

advantage


6/25

Broadband Wireless Technologies

3G Mobile

Based on WCDMA & CDMA

Supports data rates 144 kbps for outdoor mobile environment

384 kbps in low mobility environment

2 mbps in indoor environment


7/25

Wi-Fi

Wireless LAN with Broadband option

Most widely used LAN standard Uses 2.4 GHz band & delivers 11 mbps of data

over distances of 100 meters


8/25

WiMAX (Worldwide interoperability forMicrowave Access)

Provides shared data rates up to 70 mbps in 2-11

GHz Service area range of 50 kms

LMDS (Local Multipoint Distribution System)

Operates in various bands such as 10.5 GHz (8

kms) and 26 & 28 GHz (3 kms) Provides various interfaces at user end like E1,

4xE1, 10/100 Base T Ethernet etc.


9/25

MMDS (Multichannel Multipoint Distribution

System)

Operates in 2-3 GHz (20-40 kms radius) Provides high speed data rates up to 10 mbps

FSO (Free Space Optics)

Enables optical transmission of data throughopen space at near infrared wavelengths

Offers 10 mbps 2 Gbps over few kilometers


10/25

Satellite

Uses VSAT (Very Small Aperture Terminals) &

DTH (Direct To Home) terminals Offers data rates 9.6 kbps for a handheld

terminal and 60 Mbps for a fixed VSAT

terminal

Future will support up to 155 Mbps


11/25

DSL (Digital Subscriber Line)

Technologies for high bandwidth to home and

small business over ordinary coppertelephone lines

Achievable data rate depends on the distance

and cable impairments


12/25

Cable Modem

Allows high speed access to the Internet via a

cable television network Uses cable modem technology through the

use of Set-Top-Box at the customer premises


13/25

Optical Fibre

Optical fibre with its unmatched capacity to carryenormous amount of information over unlimited

distances can be deployed for broadband accessin:

PON (Passive Optical Network)

FTTH (Fibre-To-The-Home)

FTTC (Fibre-To-The-Curb)

HFC (Hybrid Fibre Co-axial)


14/25

PLC-Power Line Communication

Can provide broadband Internet access

through ordinary power lines Suffers from technologiecal challenges due to

interference with noise, radio and television

etc.


15/25

Digital Subscriber Line (DSL)

xDSL

Symmetric DSL

Provide identical data rates upstream &downstream

Asymmmetric DSL

Provide relatively lower rates upstream but higher

rates downstream


16/25


Four main variations of xDSL exist:

ADSL Asymmetrical Digital Subs Line

HDSL High bit/data rate Digital Subs Line

SDSL Symmetric Digital Subs Line

VDSL Very high data rate Digital Subs Line


17/25


DSL may offer more than 100 times the network

performance of a traditional analog modem

Precise speed of a connection depends upon the

type of DSL employed

DSL uses the same telephone line as traditional

modem

Provides simultaneous access to web &telephone removing the need for a second

telephone line


18/25


DSL remains always-on all the time

On power failure, telephone line is stillavailable like a standard telephone line

DSL can also be implemented with PPPoE(Point to Point Protocol over Ethernet) thatdoes not always on. This is required when

authentication is necessary. PPPoE can beconfigure in PC it can be configured in ADSLmodem itself


19/25

ADSL

ADSL is used for applications which require

greater download bandwidth but require

relatively little in opposite direction like web

browsing, file downloads etc.

An ADSL circuit connects an ADSL modem on

each end of a twisted pair telephone line

creating three information channels


20/25

A high speed downstream channel

A medium speed duplex channel for bothupstream & downstream applications

A basic telephone service channel

Provides:

16 640 kbps upstream

1.5 9 mbps downstream

Can work up to a distance of 3.7 to 5.5 kms


21/25

ADSL 2

Second generation of ADSL

Offers a greater data rates of 15 Mb/sdownstream and up to 1.5 mb/s upstream with a

range of 6.4 kms Supports in real time to meet the changing line

conditions

Fast start up i.e. reduced initialization time from

10 secs to 3 secs. Data rates can be increased by bonding multiple

phone lines (2 or more copper pairs) together


22/25

ADSL 2+

Doubles the max. frequency used for

downstream data transmission from 1.1 MHz

to 2.2 MHZ

Offers a greater data rates of 25 Mb/s

downstream and up to 1.5 Mb/s upstream.

Can work up to 6.3 kms with reduced data

rates.

Has all the benefits of ADSL 2


23/25

DMT (Discrete Multi Tone) Modulation

Bandwidth from 0 to 1.1 MHz is divided into

256 sub carriers with each occupying 4 KHz.

Lower 1 to 6 sub carriers are reserved to passthe 4 KHz analog voice signal

There are 32 upstream channels and 218

downstream channels.


24/25

ADSL 2/2+

ADSL 2/2+ are further improvement over ADSL andprovide greater download speed and better range

Due to better modulation efficiency, more download

speed is possible ADSL 2/2+ can re-synchronize on line at different speed

without interrupting the communication if SNRchanges due to external interference. This is notpossible with ADSL

When no communication is taking place ADSL2/2+ cango in sleep/power saving mode and come back to livemode automatically when data transmission starts.


25/25

THANKS

Date post:	29-May-2018
Category:	Documents
Upload:	himanku-baishya
View:	229 times
Download:	0 times

Intro to Brod Band

Documents