ADSL Asymmetric Digital Subscriber Line

1
???? ???? ??? ?? ???? ?????
2
ADSL

• Asymmetric
• Digital
• Subscriber
• Line

3
Heres What You Will Learn About ADSL!

• What is it?
• What are the benefits?
• How fast is it?
• How does it work?
• How do I get it?
• What can I use it for?

4
What is ADSL?

• ???????? ???? ??????? ??? ?? ??????? ?????
  ?????? ???? ???? ???? ?????? ?? ??????? ? ????
  ??? ???? ?? ?? ???? ??????? ?? ??? ???? ?? ?? ???
  ?? ?? ???? ?? ???? ????? ?? ????????? ?????

5
What are the benefits of ADSL?

• ?????? ??????? ?????? ?? ?? ???? ? ??????? ??
  ????
• ????? ?????? ?? ??????? ?? 140 ????? ???? ??????
  ??????
• ????? ????? ?????? ???? ?? ???????
• ????? ????? ?????? ??????? ???? ?? ????
• ?????? ?? ?????? ??????? ?????
• ?????? ?? ????? ?????

6
Simultaneous Connections

• ??????? ???? ????? ? ?????? ??????? ?????? ??
  ???? ?? ??? ???
• ??? ???? ?? ??? ?????? ??????? ?? ???? ????? ???
  ??????
• ??? ???? ?? ?????? ???? ?? ???????

7
Lightning Fast Internet

• ADSL ???? ??? ????? ?? ????? ?? ???
• Full-rate ADSL ?????? ????? ???? ?? 8Mbps
• G.Lite ADSL ????? ????? ???? 1.5Mbps ???? ??????
  ?? 25 ????? ???? ?????? ?????? 56K ???
• ????? ????? ???? ??? ????? ?? ?????? 256Kbps ? ??
  ????? ?? ???? ????? ????? ????

8
ADSL vs. Other Modems
9
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!

10
ADSL Reliability

• ??? ??? ?????? ????? ? ??????? ?? ????? ??? ???

11
ADSL Security

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

12
How does ADSL work?

• ?? ?? ???? ?????? ???? ??? ?????? ??? ? ??????
  ??????? ?????? ?? ???? ?????? ????
• ??? ? ??? ???? 4KHz ??? ????? ?? ????? ??????
• ?????? ??? ?????? ??????? ?? ?????? ???? ??????
  ????

ADSL
Voice/Fax
25 kHz
0 kHz
3.4 kHz
1100 kHz
13
How do I get ADSL?

• ADSL Service Providers
• Local phone companies
• Local Internet service providers
• ADSL Modems
• Check with your service provider for compatible
  modems

14
ADSL History
1985 -- 1990 -- 1995 -- Now --
Bell Labs discovers a new way to make traditional
copper wires support new digital services
Phone companies start deploying High-Speed DSL
(HDSL) to offer T1 service on copper lines
without the expense of installing repeaters.
Phone companies begin to promote ADSL as a way to
enter the video market.
Innovative companies begin to see ADSL as a way
to meet the need for faster Internet access
ADSL is being deployed for fast Internet access
across the United States.
15
Different types of ADSL

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

16
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

17
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

18
Splitter vs. Splitterless

• 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

19
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

20
ADSL Summary

• ADSL provides a new way to use existing phone
  lines.
• Its faster!
• Its always on!
• Voice and data on one line at the same time!
• ADSL is the best way to get online!

21

• ANY QUESTION ?