Wi-Fi COMMUNICATION

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GROUP MEMBERS.

JAWAD ALI BSET01111037

SYED IMRAN ALI BSET01113054

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Wi-Fi Technology

IntroductionPurposeThe Wi-Fi TechnologyElements of a WI-FI NetworkHow a Wi-Fi Network WorksWi-Fi Network TopologiesComparison with Blue-ToothWi-Fi ApplicationsWi-Fi SecurityAdvantages & Disadvantages

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Introduction.

• Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode.

• Wi-Fi Network connect computers to each other, to the internet and to the wired network.

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Purpose

The main purposes of Wi-Fi are the following:

make access to information easier eliminate cabling and wiring

eliminate switches, adapters, plugs, pins and connectors

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The Wi-Fi Technology

Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed:

• IEEE 802.11b• IEEE 802.11a• IEEE 802.11g

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IEEE 802.11b• Appear in late 1999• Operates at 2.4GHz radio spectrum• 11 Mbps (theoretical speed) - within 30 m

Range• 4-6 Mbps (actual speed)• 100 -150 feet range• Most popular, Least Expensive• Interference from mobile phones and

Bluetooth devices which can reduce the transmission speed.

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IEEE 802.11a• Introduced in 2001• Operates at 5 GHz (less popular) • 54 Mbps (theoretical speed)• 15-20 Mbps (Actual speed)• 50-75 feet range• More expensive• Not compatible with 802.11b

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IEEE 802.11g• Introduced in 2003• Combine the feature of both standards (a,b)• 100-150 feet range• 54 Mbps Speed• 2.4 GHz radio frequencies• Compatible with ‘b’

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Basic Elements of a WI-FI Network

• Access Point (AP) - The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet.

• Wi-Fi cards - They accept the wireless signal and relay information. They can be internal and external.

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How a Wi-Fi Network Works

• Basic concept is same as Walkie talkies.

• A Wi-Fi hotspot is created by installing an access point to an internet connection.

• An access point acts as a base station. • When Wi-Fi enabled,device encounters a hotspot,

the device can then connect to that network wirelessly.

• A single access point can support up to 30 users.

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Wi-Fi Applications

• Home• Small Businesses• Large Corporations & Campuses• Health Care• Travellers

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To make Wi-fi secure,there is a password required to connect with network.

User can’t access to internet untill given password is correct.

Wi-Fi Security 15

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Advantages

• Mobility• Ease of Installation• Flexibility• Cost• Reliability

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Limitations OR Disadvantages

• Low speed• Extra power consumption• Limited range• Require configuration of hardware and

software.

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