How High-speed Dial-up Works


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How High-speed Dial-up Works

  1. 1. How High-speed Dial-up Works Presented by: Zainab Muneer
  2. 2. INTRODUCTION Dial-up is often the only choice available for rural or remote areas where broadband installations are not prevalent due to low population and demand. The connection speed of dial-up is limited by the bandwidth of phone lines High-speed dial-up connections are five times faster than traditional dial-up service. New technology offers a solution to the slow- down that doesnt necessitate broadband
  3. 3. PROTOCOL Handshake ProtocolAllows data to be sent to and from your computer using the Internet– Modem handshake: Initialize the internet connection– Software handshake: Deals with authenticating the users access to the ISP
  4. 4. PROTOCOLHigh-speed dial-up providers cant doanything about the modem handshake, but they can speed up the software handshake
  5. 5. ACCELERATION SERVERS • High-speed dial-up allows your machine to establish a connection with your ISP in a fraction of the time it takes with standard dial-up
  6. 6. ACCELERATION SERVERS • By loading special software into a server, they turn into an acceleration server • Acceleration servers speed up the dial-up data transfer using several techniques: – Compression – Filtering – Caching
  7. 7. ACCELERATION SERVERS- Techniques 1. File Compression Types of file compression: lossless compression lossy compression Acceleration server compresses different file types For text files-least 50% compressed For image files-from 50 % to 90 % In many other files, including video files, Zip files and MP3 music files, compression has already taken place. For example, an MP3 file is
  8. 8. ACCELERATION SERVERS- Techniques 2- Filtering  High-speed dial-up providers have bundled a pop-up blocker into the software  This pop-up blocker is programmed to recognize those lines of code that spell out the ad parameters  When it sees those tell-tale lines of code, it rejects the ads request to be displayed
  9. 9. ACCELERATION SERVERS- Techniques 3- Caching Server-side Caching:  Instead of constantly requesting the same page, the acceleration server takes note of which Web pages are being commonly asked for by all subscribers  Then it stores the page in its memory, and every time another subscriber asks to see, one of most
  10. 10. ACCELERATION SERVERS- Techniques 3- Caching Client-side caching  In high-speed dial-up softwares, the browser stores the cached pages on your computers hard disk  It looks for elements in those pages that remain constant (eg homepage, the logo, the header, the navigation)  Then only loads what has changed every time user come to the page
  11. 11. CONCLUSION• High-Speed Dial-up connection uses the techniques of Accelerator server to enhance the speed of simple Dial- up connection• This technology does not necessitate broadband• The key element of high-speed dial- up Internet is file compression• Caching and filtering save time by avoiding unnecessary data