Dakhara106wi-fi

WI-FI

09/12/09

NAME: Dakhara Pradip B ID : 07EC072 LDRP-ITR

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index

vTYPE OF WIRELESS COMMUNICATION vINTRODUCATION vHISTORY OF WI-FI vWHY WI-FI vTHE WI-FI THECHNOLOGY vElements of a WI-FI Network

vHow a Wi-Fi Network Works vTypical Home Setup vWi-Fi Network Topologies vWIFI Standards vWhat’s so good about it?? v COMPARISONS 3G VS.WI-FI

vWIFI – Applications vWIFI - Advantages 09/12/09

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Type of wireless

Wi-Fi Bluetooth Infrared GPRS GSM 09/12/09

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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 (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLANs). • Wi-Fi Network connect computers to each other, to the internet and to the wired network.

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History of WIFI  • Wi-Fi stands for Wireless Fidelity protocol, it is a set of

standards  for wireless local area network (WLAN)  • The IEEE first introduced standard No. 802.11 with transmission  speed of 1 and 2 Mbps in the 2.4 GHz band in 1997  • Wi-Fi technologies are supported by nearly every modern  personal computer operating system, most advanced game  consoles and laptops, and many printers and other peripherals.  • The purpose of Wi-Fi is to provide wireless access to digital  content. This content may include applications, audio and visual  media, Internet connectivity, or other data. Wi-Fi generally  makes access to information easier, as it can eliminate some 09/12/09

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Why WI‐FI ØConvenience: Flexibility of time and location ØMobility: Access the internet even outside their normal work environment ØProductivity: Potentially be more ØDeployment: Requires little more than a single access point ØExpandability: Serve a suddenly increased number of clients

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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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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.(e.g PCMCIA Card for Laptop and PCI Card for Desktop PC)

• Safeguards - Firewalls and anti-virus software protect

networks from uninvited users and keep information secure.

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How a Wi-Fi Network Works • Basic concept is same as Willkie 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 and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors. • Many access points can be connected to each other via Ethernet cables to create a single large network. 09/12/09

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Typical Home Setup

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Wi-Fi Network Topologies • AP-based topology (Infrastructure Mode) • Peer-to-peer topology (Ad-hoc Mode) • Point-to-multipoint bridge topology

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AP-based topology • • • •

The client communicate through Access Point. BSA-RF coverage provided by an AP. ESA-It consists of 2 or more BSA. ESA cell includes 10-15% overlap to allow roaming.

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Peer-to-peer topology • AP is not required. • Client devices within a cell can communicate directly with each other. • It is useful for setting up of a wireless network quickly and easily.

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Point-to-multipoint bridge topology This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart. These conditions receive a clear line of sight between buildings. The line-of-sight range varies based on the type of wireless bridge and antenna used as well as the environmental conditions

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WIFI Standards  In 1999 the first standard was ratified by IEEE to create two

new  standards  – 802.11a: OFDM was added in the 5.8 GHz spectrum with transmission  speeds of up to 54 Mbps  – 802.11b: was added 5.5 and 11 Mbps support using DSSS in the 2.4 GHz  making it backward compatible with 802.11  • In 2003 the second standard was ratified to create 802.11g  – 802.11g: high speed transmission up to 54Mbps by applying OFDM in the  2.4 GHz spectrum  – The 802.11g is backward compatible with 802.11b by integrating DSSS  modulation techniques at 11, 5.5, 2 and 1 Mbps 09/12/09

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What’s so good about it?? Wi-Fi allows local area networks (LANs) to be deployed without cabling for client devices,

typically reducing the costs of network deployment and expansion. Spaces where cables cannot be run, such as outdoor areas and historical buildings, can host wireless LANs. Convenience Mobility (anytime) Coverage (anywhere) New applications potential (services) Improved quality of life 09/12/09

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WIFI - Applications 1. Hotspot Services 2. Point-to-Point 3. Point-to-Multi Point 4. Last-mile 5. Hot Zone Service 6. Traffic Light 7. Dock Area 8. Indoor Wi-Fi Extension 9. Trucking 10. Hi-Speed Mobility 11. Fire Alarm 12. Wireless Surveillance 13. Highway Accident Monitoring 14. Wireless Advertisement 09/12/09

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WIFI Applications

Hotspot Services Internet VoIP Phone

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WIFI Applications

Point-to-Point or Point-to-Multi Point Long distance link Headquarter and Branches 09/12/09

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WIFI - Applications Last-mile Residential area

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WIFI Applications Hot Zone Service Internet VoIP Phone Surveillance

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WIFI Applications

Traffic Light Emergency Control Data/Voice/Video 09/12/09

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WIFI - Applications

Dock Area üData service üVoIP Phone üSurveillance 09/12/09

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WIFI - Applications Indoor Wi-Fi Extension

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WIFI - Applications

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WIFI Applications

Wireless Surveillance

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WIFI

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WIFI Applications

Highway Accident Monitoring 09/12/09

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IN METRO WI-FI SYSTEM

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WI-FI ON THE HIGHWAY

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coverage area

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The University of Tennessee

26K Students, ~4K faculty/staff at the Knoxville Campus, 1.2M assignable Sq Meters

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USA spending on municipal wireless networks 3 • MuniWireless – October 2006 forecast – $3 billion to 2010 on Muni Wi-Fi in USA alone – 100s of cities in RFP stage, scores in

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WIFI - Advantages  Wi-Fi uses unlicensed spectrum  Bypassing the need of costly & poor telephone line, it is more

cost effective and  much easier to deploy  It requires much lower cost in the long runs, rather than rely on Telco’s  infrastructure  Wi-Fi belongs to open International standards, equipments can be obtained  easily in the market at very competitive price  Wi-Fi offer the freedom to move and supports roaming  Wi-Fi support various degree of security & encryption  LAN speed performance and obviously broadband  Low cost infrastructure 09/12/09

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THANK YOU 09/12/09

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