Dsl

Dsl

• 1.
  DSL Digital Subscriber Line Presentedby : AL-Maqashi Saleem (49) Patkar college
• 2.
  Agenda        Aim of DSL Whatis DSL? PROs & CONs Block diagram DSL standards Conclusion References
• 3.
  The Need forSpeed  Explosive Growth of the Internet  Increase Demand for High-Speed Access  By Businesses & Individuals  Increase Demand for New Applications  Real-time interactive multimedia  Video conferencing  Distance learning
• 4.
  What is DSL? Digital Subscriber Line  A technology which uses the existing transmission medium (telephone wire) to provide high-speed transfer of information across the internet.  DSL simply uses more of the bandwidth.  DSL  allows simultaneous voice and high-speed data services such as super fast Internet access  over a single pair of copper telephone wires.
• 5.
  Common Types ofDSL
• 6.
  How It Works A. Over the Wire: You are connected to another ADSL modem which also has a POTS splitter, which separates voice calls from data.  B. Telephone Calls: Voice calls are routed to the phone company's public switched telephone network (PSTN) and proceed on their way as usual.  C. Internet Requests: DSL Access Multiplexer links many ADSL lines to a single high-speed asynchronous transfer mode (ATM) line, which in turn connects to the Internet. Plain old telephone  D. Back at You: The requested data is retrieved from the Internet and routed back to you.
• 7.
  Advantages of DSL Thefollowing are some advantages of DSL service:  Broadband Internet and Phone at the same time: You can be online on facebook and twitter and at the same time talk to your friend on your landline connection. This was not possible with dial- up connection as going online meant you could not use your landline phone.  Faster Internet: It is was faster than the 52 kbps dial up connection. DSL internet provides speed of above 2mbps   No wiring: Since DSL broadband connection uses phone line to connect to the net no special wiring is required
• 8.
  Con,,,,  No DroppedConnections: A major problem with dial up connection was that it would disconnect all of a sudden leaving you high and dry. DSL connections do not have these problems and seldom is there a disconnection.  Faster Downloads: Faster DSL network means, that downloads are faster. Now you can download more files in the same time.  Multiple Computers on Single DSL Line: More computers can be connected to internet using the same DSL connection. That means no need to take special connection for an extra computer or laptop.
• 9.
  disadvantages of DSL Thefollowing are some disadvantages of DSL:  Your DSL connection works faster if you live closer to the provider’s central office. The farther your home is from the ISP’s office the more your speed will reduce.  Data being received is faster than data being sent over the Internet.  DSL availability is limited to certain cities, not everyone can get this service
• 10.
  DSL Architecture  DigitalSubscriber Line (DSL) is the newest technology being used for Internet access. DSL connects your home or office to the Internet through the same telephone wire . Like ISDN, with DSL, user can make and receive telephone calls while connected simultaneously to the Internet .  To use DSL you will need a DSL modem (also called a router), a Network Interface Card (NIC), and a telephone line. DSL is also relatively new technology that is just being introduced in many places . Hardware developers are working with service providers to make the service cost affordable for consumers. As time goes by, the service should become more widely available at a reasonable price.
• 11.
  DSL BLOCK DIAGRAM
• 12.
  Two standards forDSL 1- Discrete multitone (DMT) : is a form of FDM that divide data into 256 downstream and 32 as upstream channels . Discrete Multi-Tone (DTM), a multi-carrier modulating technology, is generally used as the modulation standard for ADSL. DTM is very resistant to noise. 2- Carrierless amplitude/phase (CAP) : is a version of QAM by dividing the signals into three part ,, voice , upstream and downstream .
• 13.
  Conclusion It is highlylikely that xDSL will become widely adopted particularly among high-speed Internet "power users" as well business requiring fast access to various networks, provided naturally that the prices come down. xDSL technology offers a viable interim solution to the bandwidth problem while fiber optic cables are being installed.
• 14.
  References Data Network Design-Selected pages (3rd Edition) darren L. Spohn ADSL Forum, "General Introduction to Copper Access Technologies", http://www.adsl.com/adsl/general_tutorial.html The Need for Speed", http://www.kentrox.com/product/cellworx/nspeed/xDSLprimer.html
• 15.
  Thank you ……… …… .. .