ADSL

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ADSL

• Che Rohani Ishak - GS12895
• Siti Ruzaimah Ghazali - GS12557
• Saifuddin Samsuddin GS 09785
• Tengku Mohd Dzaraif GS 10805

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Content

• What is ADSL
• History of ADSL
• Benefits of ADSL
• ADSL Technology
• Conclusion

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What Is ADSL

• ADSL Asymmetrical Digital Subscriber Line, is a
  broadband communication technology that creates
  high-speed access to the Internet and remote
  networks using the phone lines that are already
  present in your home. ADSL is superior to analog
  modems in many respects.

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History of ADSL

• 1985 - Bell Labs discovers a new way to make
  traditional copper wires support new digital
  services - especially video-on-demand
• 1990 - Phone companies start deploying High-Speed
  DSL (HDSL) to offer T1 service on copper lines
  without the expense of installing repeaters -
  first between small exchanges. Phone companies
  begin to promote HDSL for smaller and smaller
  companies and ADSL for home internet access.
• 1995 - Innovative companies begin to see ADSL as
  a way to meet the need for faster Internet access
• 1998 - DMT was adopted by almost all vendors
  following ANSI T1.413 - issue 2
• 1999 - ITU-T produced UADSL G.992.2 (G.lite) and
  G.922.1 (G.full)

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What are the benefits of ADSL?

• You can talk on the phone and use the Internet at
  the same time on a single phone line
• You can connect to the Internet at up to 140
  times faster than analog modems
• Your connection to the Internet is always on
• Your home has its own dedicated connection
• Your connection is highly reliability
• Your connection is highly secure

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ADSL

• Technology

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Simultaneous Connections

• Talk on the phone and surf the Internet at the
  same time on the same phone line!
• You do not have to disable call waiting to
  connect to the Internet.

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Lightning Fast Internet

• Full-rate ADSL has the potential to deliver data
  at speeds up to 8 Megabits per second.
• G.Lite ADSL can deliver up to 1.5 Megabits per
  second during downloads. This is 25 times faster
  than a 56K modem, and 50 times faster than a
  28.8K modem!
• Service providers will also offer slower rates
  (from 256 Kbps and up) at lower costs.

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ADSL vs. Other Modems
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Network Access Methods
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Always On

• Because the information is transmitted separately
  from the voice/fax calls, your Internet
  connection can stay on all the time.
• No more logging on and off
• No more busy signals
• No more waiting just open your browser and go!

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Dedicated Connection

• Unlike a cable modem, ADSL gives you a dedicated
  line to the Internet. With cable modems, you are
  using a shared line with all the other users in
  your neighbourhood.

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ADSL Reliability

• One strength of phone providers is their small
  number of service outages per year, something
  cable companies cannot claim.
• Even if the power goes out, you will still be
  able to make phone calls.
• Unlike cable modems, your connection speed will
  not be affected by how much bandwidth your
  neighbours use.

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ADSL Security

• The dedicated connection that ADSL uses provides
  more security than cable.
• Cable modem users share bandwidth with their
  neighbours. Information traveling across the
  network is easier to snoop.

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How does ADSL work?

• One phone line delivers voice and a high-speed
  Internet connection
• Voice/fax calls only use the frequencies below 4
  kHz
• Frequencies above 4 kHz are reserved for data
  transmission

ADSL
Voice/Fax
25 kHz
0 kHz
1100 kHz
3.4 kHz
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How DSL divide bandwidth
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ADSL Connection
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DSL-based Reference Diagram
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Different types of ADSL

• Full-rate ADSL
• Universal ADSL (G.lite)

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Full-rate ADSL

• Full-rate ADSL boasts data rates ranging from 1.5
  to 8 Megabits per second downstream from the
  Internet to your computer
• Upstream data rates from your computer to the
  Internet are as high as 1 Mbps
• Potential data rates decrease with increased
  distance from the phone companys CO (central
  office)
• Costs for the service are more expensive than the
  new, lower data rate G.Lite ADSL

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G.Lite ADSL

• G.Lite ADSL is a scaled-down version that
  delivers up to 1.5 Mbps downstream and 384 Kbps
  up
• Service providers will offer slower rates for
  lower prices
• Less expensive than full-rate ADSL
• Easier to install

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Splitter

• Full-rate ADSL requires that a device, known as a
  splitter, be installed on your phone line where
  it enters your home in order to separate the
  voice service from the data service
• G.Lite ADSL will not usually require a splitter,
  although some homes with problematic wiring or
  certain types of telephones will require one.

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What can I use ADSL for?

• Faster downloads of anything digital
• CD-quality audio
• Graphics-rich websites
• Faster and better multimedia
• High-speed multiplayer games

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Conclusion

• ADSL was born of the need for speed coupled with
  the desire for low cost dedicated remote network
  access. It will revolutionize the way we see the
  World Wide Web. ADSL emerge heralding the coming
  of a new age of remote multimedia. With the
  internet influencing our lives more and more each
  day, it will be high speed ADSL connections that
  power the revolution. In the future people will
  view ADSL like they view cable TV. That such a
  small object as an ADSL card may wield such an
  influence over our lives.

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• Thank you
• for your time.