The need for speed terry foley rhonda hoskins jerry gilroy jill morgan
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The Need For Speed Terry Foley Rhonda Hoskins Jerry Gilroy Jill Morgan. High Speed Internet Technology. Outline. What is DSL? Where did DSL originate? How does DSL work? What types of DSL are available? Myths and Truths about DSL Its closest competitor

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The need for speed terry foley rhonda hoskins jerry gilroy jill morgan

The Need For SpeedTerry FoleyRhonda HoskinsJerry GilroyJill Morgan

High Speed Internet Technology

High Speed Internet Technologies


Outline

Outline

  • What is DSL?

  • Where did DSL originate?

  • How does DSL work?

  • What types of DSL are available?

  • Myths and Truths about DSL

  • Its closest competitor

  • http://computingcentral.msn.com/topics/bandwidth/howfast.asp


What is dsl

What is DSL?

  • DSL – Digital Subscriber Line

  • Uses ordinary telephone wire

  • Speed varies depending on type

  • An “always on” service – No dial-up

  • One line carries both data and voice


Where did dsl originate

Where Did DSL Originate

  • Created by Bellcore in 1989

  • To deliver video on-demand to compete with cable TV

  • Never really used for this

  • People noticed the potential for internet applications


How does dsl work

How Does DSL Work

  • Implemented over the “last mile”

  • Uses digital technology

  • Utilizes line-coding scheme

  • Divides line into 3 bands

  • Lower for voice, Higher 2 for data


How does dsl work cont d

How Does DSL Work cont’d

  • Phone company must install special router – DSL access multiplexer

  • This transfers data from copper line to larger backbone

  • CO must be approx. 18000 ft from the end user for top performance

  • End user must have special router or modem


Types of dsl

Types Of DSL

  • HDSL – High-Data-Rate DSL

  • ADSL – Asymmetric DSL

  • RADSL – Rate Adaptive DSL

  • SDSL – Symmetric DSL

  • VDSL – Very-High-Rate DSL


Speeds of different types

Speeds Of Different Types


Myths and truths

Myths And Truths

  • Myth – DSL is easy to install

  • Truth – Technician needed to install modem and wiring

  • Myth – Speed of DSL

  • Truth – Performance is effected by electromagnetic noise and distance


Its closest competitor

Its Closest Competitor

  • Cable – It provides similar speeds, service and technology

  • Uses local TV line to give continuous connection


The need for speed

The Need For Speed


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