An Introduction to ADSL

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An Introduction to ADSL

• BTopenworld

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Instructions

• Use your SPACE BAR TO MOVE TO THE NEXT SLIDE
  when you see the prompt Next Slidein the
  bottom left corner of each slide,dont move on
  before this as you may miss some information.Each
  slide will be accompanied by text information
  like this and the slide will build at appropriate
  times to demonstrate certain points.
• You should by now see that the prompt next
  slide has appeared, depends on how quick you
  have read this, so lets move on to the rest of
  the session
• Good luck and if you have problems understanding
  any of this training then you can email me at
  rob.j.clarke_at_bt.com.
• There are lots of FAQs that may help answer your
  query before mailing me and they are available
  from the Help section in this web training site.

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Agenda

• BTopenworld Who Are We ?
• ADSL Overview
• Methods of accessing the Internet

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• First of all what is or who are BTopenworld
  (BTOW).
• Well as can be seen BT is comprised of 6
  companies and BTOW is the ISP for BT.
• We are no different to many other ISPs in that we
  are NOT the only provider of the new ADSL fast
  internet service there are many other ISP who too
  will be providing ADSL.
• There is a relationship between BT Ignite and
  BTopenworld in that they will supply all our ADSL
  lines and equipment.
• It will also be BT Ignite who will supply the
  same equipment and lines to our competitor ISPs
  using ADSL technology.The exceptions are the
  cable companies who will be using their own cable
  network and equipment.

BT Ignite
MMo2
BT Retail
BT Wholesale
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INTERNET FRUSTRATION
Been Here?
Done that or felt like it anyway!!
What with the frustration and the slowness of the
internet which can give us real grief But by
taking the BTOW fast internet service we can save
ourselves from ending up like that poor chap
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• So let see what this ADSL technology is and how
  it can benefit us.
• First ADSL stands for Asymmetric Digital
  Subscriber Line.
• It is delivered to you over a single ordinary BT
  telephone line( it must be a BT line).
• It gives a fast down load speed anything upto 40
  times faster than your existing 56K modem.

The Internet

• In the other direction to send out information to
  the internet its upto 4 or 5 times faster than a
  56k modem.
• So as we can see the service is fastest in the
  right direction i.e. down loading information
  from the internet that is what Asymmetric
  actually means -- unbalanced .

Customer

• In addition to cruising the internet the
  technology also allows us to make and receive
  telephone or fax calls at the same time with
  little effect on the speed of connection.
• Which makes our lives that much easier and more
  productive.

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Methods of Accessing the Internet

• Lets look at the existing ways customers can
  access the internet at present.
• First the usual old dial up 56K modem ,pay as
  you go - slow but cheap? , same. SLOWWWW speed
  in both downloading and sending data to the
  internet.
• To give an idea of speed it would take roughly
  15-20 mins to load a 1 min video clip.
• Cannot use the telephone line to make
  simultaneous phone calls and surf the Net.

Max speed 56Kilobits per second if you are lucky
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ISDN Access

• Next is ISDN 2 still dial up pay as you go
  service using an ordinary telephone line.
• But this technology uses special digital channels
  to send and receive data from the internet.
• It is possible with this technology to surf the
  Net and use the phone as the same time.
• Unlike the old 56K modem method it uses a box
  called a Terminal Adapterto connect the PC and
  phone to the ISDN service.
• The max speed of ISDN 2 is 128K and unlike the
  56K modem the speed of this service is
  guaranteed but only as far as the connection to
  the Net.
• Once into the Net then its anybody's guess as to
  how fast things go .It takes about 5mins to
  download a 1min video clip.
• For more info on ISDN 2 goto www.bt.com and
  search for ISDN 2

Terminal Adapter
128Kilobits per second
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Business Or Home Highway

• Home or Business Highway is a variation of the
  ISDN 2 service.
• It still uses the 2 digital channels each being
  64K but the customer no longer has to use a
  Terminal Adapter for their phone or fax
  machine.They simply plug them into the Highway
  box.
• However they do still need to plug the PC into a
  Terminal Adapter and then into the Highway box.
• Speed is still guaranteed but same conditions
  apply as with ISDN 2.
• The customer can only have 2 simultaneous calls
  at a time e.g phone call and one PC surfing the
  Net or fax call and a phone call.
• For more info goto www.bt.com and search for Home
  Highway.

BT Digital Access
Power
Service
Terminal Adapter
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ISDN and Business Highway Upgrading to ADSL

• NOTE CUSOTMERS CAN CONVERT FROM THEIR ISDN OR
  BUSINESS HIGHWAY LINE TO BT OPENWORLD SERVICE
• BUT THERE IS A SPECIFIC UPGRADE PROCESS TO DO
  THIS
• PLEASE READ THE DOCUMENTISDN TO BT OPENWORLD
  CONVERSION TO AVOID ANY MIS-SELLING ISSUES AND
  UNECESSARY COSTS

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BT Net Start

• BT net start is another way in which customers
  can connect to the internet.
• This product uses a permanent connection to the
  internet which the customer rents from BT on a
  annual basis.
• There are no call charges and the annual rental
  is of a higher value than other permanently on
  connections like ADSL.
• The typical speed of connection to the net is 64K
  and like ISDN is guaranteed but only upto the
  Net.
• For more info on Net Start goto
• www.btignite.com/internetservices/btnet/products_d
  irect_start.htm

Single LAN 10-20 users
BT Net Start Permanent always on connection
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So to put things in perspective of all these
different access methods lets compare the dial up
56K method to ADSL. Using this conceptual
diagram which represents the download of a web
page from the internet( no we are not loading
tubs of red sludge) its just a conceptual
diagram OK. We can see Its a slow and tedious
business waiting and waiting for the ----- OHH I
give up!! Lets go to the next slide.
Web page
Personal computer
Local exchange
Core network
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Much better and faster if we could replace this
modem with a high speed link and that is exactly
what the ADSL allows us to do.
Personal computer
Web page
Local exchange
QUICK WASNT IT !
Core network
56K modem
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In order for the customer to have ADSL BT has to
upgrade its local exchanges with extra
equipment. So far we have successfully covered
approx. 60 of the homes and businesses in the
UK.
Overhead distribution
Local Exchange
Street cabinet
The customer also requires an ADSL modem
connected to their computer
Telephone pole
Underground cable
The main point to realise is that high speed
internet service is not available everywhere yet
but an aggressive rollout plan is in place to
supply service as fast as possible. You need to
use the BTOW Web site ( www.btopenworld.com
/broadband) to check if the local exchange has
been upgraded. In all cases orders are subject to
a line test survey before supplying the customer
with the service. Failing the line test means
they CANNOT have the service but there are other
alternatives such as ISDN2e or Satellite
Broadband.
BT Customers
Underground distribution

• Telephony high speed internet
• delivered over single telephone line !

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What is ADSL ?

• So in recap then -
• ADSL is a high speed internet connection.
• Its Unbalanced with the fastest speeds in down
  loading, upto 40 times the speed of 56K modem,
  but not guaranteed.
• Its always on -- you can be permanently
  connected to the Net with no call charges.
• Fixed flat rate monthly charge, easy to budget
  for.
• Uses an ordinary phone line to surf the Net and
  use the phone at the same time.
• Not available everywhere yet.
• And is always subject to passing a survey before
  being installed.

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