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Wi-Fi Technology : 

Wi-Fi Technology

Agenda : 

Agenda Introduction Wi-Fi Technologies Wi-Fi Architecture Wi-Fi Network Elements How a Wi-Fi Network Works Wi-Fi Network Topologies Wi-Fi Configurations Applications of Wi-Fi Advantages/ Disadvantages of Wi-Fi

Introduction : 

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.

The Wi-Fi Technology : 

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

IEEE 802.11b : 

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.

IEEE 802.11a : 

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

IEEE 802.11g : 

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’

Elements of a WI-FI Network : 

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.

How a Wi-Fi Network Works : 

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 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.

Wi-Fi Network Topologies : 

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

AP-based topology : 

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.

Peer-to-peer topology : 

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.

Point-to-multipoint bridge topology : 

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.

Wi-Fi Configurations : 

Wi-Fi Configurations

Wi-Fi Configurations : 

Wi-Fi Configurations

Wi-Fi Configurations : 

Wi-Fi Configurations

Wi-Fi Applications : 

Wi-Fi Applications Home Small Businesses or SOHO Large Corporations & Campuses Health Care Wireless ISP (WISP) Travellers

Advantages : 

Advantages Mobility Ease of Installation Flexibility Cost Reliability Security Use unlicensed part of the radio spectrum Roaming Speed

Limitations : 

Limitations Interference Degradation in performance High power consumption Limited range

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