How High-speed Dial-up Works

Presented by: Zainab Muneer

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 doesn't necessitate broadband

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 user's access to the ISP

PROTOCOL

High-speed dial-up providers can't do anything about the modem handshake, but they can speed up the software

handshake

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

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

ACCELERATION SERVERS-Techniques

1. File CompressionTypes of file compression:

lossless compressionlossy compression

Acceleration server compresses different file types

For text files-least 50% compressedFor 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 already one-tenth the size of the original track on the CD.

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 ad's request to be displayed

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 visited page, it simply transmits the page out of its memory to the user

ACCELERATION SERVERS-Techniques

3- Caching Client-side caching

In high-speed dial-up softwares, the browser stores the cached pages on your computer's 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

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 transmission