Wi –fi

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Sandarsh Sethi

Technology

Definition : ,[object Object],[object Object],The name of a popular wireless networking

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Wi-Fi (Wireless Fidelity) is a generic term owned by "WiFi Alliance" which refers to any Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard. This presentation is prepared as reference of "E-Commerce Infrastructure" for BBA 6th Semester Students of Prime College. Document includes general introduction of WiFi Technology, WiFi Specification, advantages of WiFi and so on. Resources from various portals and slides from other authors has been used as reference.

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Wireless Technologies Presented by Sean Shields And Gabriel Taveras Definition Term “Wireless” refers to all the communications sent and received without wires. So Wireless Technology Means a technology that use radio waves to transmit or receive data. Wi-Fi Bluetooth Cellular Wimax TYPES OF TECHNOLOGIES INTRODUCTION: Wireless Fidelity termed as Wi-Fi uses the IEEE 802.11 specification to create a wireless local-area network. A Wi-Fi network basically consists of a wired connection to the Internet that leads to a wireless router for transmutation and receiving data from individual devices, connecting them not only to the outside world but also to each other. HOW WIFI WORKS? 1. All devices use a wireless adapter to convert request into a radio signal and broadcasts it into the air. 2. The Wi-Fi device, or wireless router, picks up the signal and translates it back into its original form. 3. The router passes the request to the Internet using a hardwired connection. 4. The Internet returns the requested information to the router across the same connection. 5. The router converts the information into a radio signal and broadcasts it into the air. 6. The computer or cell phone's wireless adapter picks up the information and displays it on your screen WIFI TOPOLOGIES Wifi have following topologies AP-based topology (Infrastructure Mode) Peer-to-peer topology (Ad-hoc Mode) Point-to-multipoint bridge topology Wi Fi Network Wireless Standards 802.11 In 1997, the Institute of Electrical and Electronics Engineers (IEEE) created the first WLAN standard. They called it 802.11 after the name of the group formed to oversee its development. Unfortunately, 802.11 only supported a maximum network bandwidth of 2 Mbps - too slow for most applications. For this reason, ordinary 802.11 wireless products are no longer manufactured. Wireless Standards 802.11b IEEE expanded on the original 802.11 standard in July 1999, creating the 802.11b specification. 802.11b supports bandwidth up to 11 Mbps, comparable to traditional Ethernet. Wireless Standards 802.11a Supports bandwidth up to 54 Mbps and signals in a regulated frequency spectrum around 5 GHz. This higher frequency compared to 802.11b shortens the range of 802.11a networks. The higher frequency also means 802.11a signals have more difficulty penetrating walls and other obstructions. Wireless Standards 802.11g Attempts to combine the best of both 802.11a and 802.11b. 802.11g supports bandwidth up to 54 Mbps, and it uses the 2.4 Ghz frequency for greater range. 802.11g is backwards compatible with 802.11b, meaning that 802.11g access points will work with 802.11b wireless network adapters and vice versa. Wireless Standards 802.11n The newest IEEE standard in the Wi-Fi category is 802.11n. 802.11n connections support data rates of over 100 Mbps. 802.11n also offers somewhat better range over earlier Wi-Fi standards due to its increased signal.

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Wi –fi

1. Wi –Fi Presented by : SANDARSH SETHI

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