dsl seminar topic

8/7/2019 dsl seminar topic

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DSLDigital Subscriber LineDigital Subscriber Line

NAVNEET KUMARRegd. No.-0701289171Branch-electronic & Tele-communication


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Outline

Introduction

Family of DSL

ADSL

ADSL speed

ADSL Network component

ADSL Principal & Modulation

DMTConclusion & Problem


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Introduction

DSL stands for Digital Subscriber Line

you can get high speed internet access overyour traditional phone line

DSL service is known as an "always-oninternetservice

DSL is capable of providing up to Mbp,andsupports voice ,video and data.

The new dsl network is IP-centric


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Inside your home

fig no.1 (from whichvoip.com/broadband)


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Worki g ista c

Fig o. 2(from broa ba f orum)

.


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ADSL .

ADSL Stands for asymmetric digital subscriberline

Asymmetric word is used because The data canflow faster in one direction than the other.

Data transmission has faster downstream tothe subscriber than upstream

Digital word is used because All data is purely

digitalSubscriber Line - The data is carried over asingle twisted pair copper loop to the subscriberpremises


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ADSL Speed depdence on

The distance from the local exchange

The type and thickness of wires used

The number of joints in the wire

The proximity of the wire to other wires

carrying ADSL, ISDN and other non-voice signals

The proximity of the wires to radio transmitters


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ADSL network components

The ADSL modem at the customer premises(ATU-R)

The modem of the central office (ATU-C)

DSL access multiplexer (DSLAM)

Broadband Access Server (BAS)

Splitter - an electronic low pass filter that separatesthe analogue voice or ISDN signal from ADSL datafrequencies DSLAM.


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A

DSL LoopArc it ct r

C ntral offic S bscrib rpr mis s

Fig no. 3(broadband for m/w it paper)


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DSL M0DEM

Fig no.4(from paper of JimSouthworth&PeterMacaulay)


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ADSL principles

ADSL exploits the unused analogue bandwidthADSL exploits the unused analogue bandwidthavailable in the wiresavailable in the wires

ADSL works by using a frequency splitter device to splitADSL works by using a frequency splitter device to split

a traditional voice telephone line into two frequenciesa traditional voice telephone line into two frequencies

Fig no 7(from paper of johnhins,barkley university)


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ADSL Modulation

Modulation is the process of varying one or more properties ofa high frequency periodic waveform , called the carrier signal,with respect to a modulating signal.

There are two standards for modulating the ADSL signal:

-Carrierless Amplitude Phase (CAP)

-Discrete Multi-Tone (DMT)


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Carrierless Amplitude PhaseIt is nonstandard version of quadrature

amplitude modulation(QAM).

It divides the available space into three bands.

The range from 0 to 4 kHz is allocated for POTStransmissions.

The range of 25 kHz to 160 kHz is allocated forupstream data traffic

and the range of 240 kHz to 1.5 MHz is allocatedfor downstream data traffic.


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Discrete Multi-tone (DMT)

The basic idea of DMT is to split the availablebandwidth into a large number of subchannel.

It is able to allocate data so that the throughputof every single subchannel is maximized.

If some subchannels can not carry any data, itcan be turned off and the use of availablebandwidth is optimized.


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Frequency bands of DMT

Fig no 8(from paper of john hins, barkley university)


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Conclusion: Pros & ConsWHYWHY ADSLADSL

Simultaneous Internet and voice/faxSimultaneous Internet and voice/faxcapabilities over a single telephone linecapabilities over a single telephone line

Uninterrupted, highUninterrupted, high--speed Internet access that'sspeed Internet access that'salways onalways on--lineline

CostCost--effective solution for societyeffective solution for society

Data Security that exceeds other technologiesData Security that exceeds other technologies

Fast download speedsFast download speeds

ADSL disadvantagesADSL disadvantages

DistanceDistance--sensitivesensitive

Slower upload speedsSlower upload speeds

Phone line requiredPhone line requiredProblem of crosstalkProblem of crosstalk


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Data rate of ADSL

Fig no.10(from paper of N.k milison/whitea er.Universit ofcolumbia


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Crosstalk- a problem in ADSL

Fig no.10(from paper of N.k milison/white paper.University ofcolumbia )


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References and bibliography

Simon haykin, Digital communiction

whichvoip.com/broadband

broadband forum

paper of JimSouthworth&PeterMacaulay

paper of john hins,barkley university

Microsoft.com/ATM cell structure

paper of N.k milison/white paper.Universityofcolumbia

Herbert taub,Donald L Schilling,Goutam saha,

Principal of communication system


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