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INTRODUCTION

INTRODUCTION. BROADBAND ACCESS WIFI ACCESS DIAL-UP ACCESS . REQUIREMENTS. High speed of broadband service Wireless rather than wired access That is less expensive than cable Much easier to extend to rural areas Broad coverage like cell phone networks. WIMAX.

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INTRODUCTION

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  1. INTRODUCTION • BROADBAND ACCESS • WIFI ACCESS • DIAL-UP ACCESS

  2. REQUIREMENTS • High speed of broadband service • Wireless rather than wired access • That is less expensive than cable • Much easier to extend to rural areas • Broad coverage like cell phone networks.

  3. WIMAX • WIMAX is a wireless digital communications system also known as IEEE 802.16. • WIMAX can provide broadband wireless access up to 30 miles(50 km) for fixed stations and 3-10 miles(5-15 km) for mobile stations. • It allows a user, to browse the internet on a laptop without physically connecting it to a router. • It involves microwaves for the transfer of data wirelessly.

  4. Parts of wimax 1.WiMAXTOWER, similar in concept to a cell-phone tower - A single WiMAX tower can provide coverage to a very large area -- as big as 3,000 square miles (~8,000 square km). 2.WiMAXRECEIVER - The receiver and antenna could be a small box or PCMCIA card, or they could be built into a laptop the way WiFi access is today.

  5. HOW WIMAX Works • A WIMAX tower station can connect directly to the internet using a high-bandwidth, wired connection. • It can also connect to another WIMAX tower using a line-of-sight, microwave link. • This connection to a second tower, along with the ability of a single tower to cover up to 3,000 square miles, is what allows WIMAX to provide coverage to remote rural areas.

  6. TYPES OF CONNECTIONS • NON-LINE-OF-SIGHTWiFi sort of service, where a small antenna on your computer connects to the tower. In this mode, WiMAX uses a lower frequency range2 GHz to 11 GHz (similar to WiFi). Lower-wavelength transmissions are not as easily disrupted by physical obstructions -- they are better able to diffract, or bend, around obstacles. • LINE-OF-SIGHT service, where a fixed dish antenna points straight at the WiMAX tower from a rooftop or pole. The line-of-sight connection is stronger and more stable, so it's able to send a lot of data with fewer errors. Line-of-sight transmissions use higher frequencies, with ranges reaching a possible 66 GHz. At higher frequencies, there is less interference and lots more bandwidth.

  7. IEEE 802.16 Specifications • Range - 30-mile (50-km) radius from base station • Speed - 70 megabits per second • Line-of-sight not needed between user and base station • Frequency bands - 2 to 11 GHz and 10 to 66 GHz (licensed and unlicensed bands) • Defines both the MAC and PHY layers and allows multiple PHY-layer specifications .

  8. Batch 8 RathnaPrakash (09E147) Rubasri. K (09E148) Rushmithathiyagarajan (09E149) Sadagopan (09E150) Sambath (09E151) Saranya (09E152) Saravanan (09E153

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