INTRODUCTION

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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. - PowerPoint PPT Presentation

Transcript of INTRODUCTION

Page 1: INTRODUCTION
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BROADBAND ACCESSWIFI ACCESSDIAL-UP ACCESS

INTRODUCTION

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High speed of broadband serviceWireless rather than wired accessThat is less expensive than cableMuch easier to extend to rural areasBroad coverage like cell phone

networks.

REQUIREMENTS

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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.

WIMAX

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Parts of wimax1. WiMAX TOWER, 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. WiMAX RECEIVER - 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.

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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.

HOW WIMAX Works

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NON-LINE-OF-SIGHT WiFi sort of service, where a small antenna on your computer connects to the tower. In this mode, WiMAX uses a lower frequency range  2 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.

TYPES OF CONNECTIONS

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Range - 30-mile (50-km) radius from base stationSpeed - 70 megabits per secondLine-of-sight not needed between user and base

stationFrequency 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 .

IEEE 802.16 Specifications

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Rathna Prakash (09E147)Rubasri. K (09E148)Rushmitha thiyagarajan (09E149)Sadagopan (09E150)Sambath (09E151)Saranya (09E152)Saravanan (09E153

Batch 8


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Introduction 1. Introduction

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