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Wi-Fi

Wi-Fi. Cost savings over wireline. Can not run wire to locations needed. To enable patrons to bring their own laptop, therefore reducing the cost of owning many PCs. To enable you to easily move PCs.

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Wi-Fi

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  1. Wi-Fi • Cost savings over wireline. • Can not run wire to locations needed. • To enable patrons to bring their own laptop, therefore reducing the cost of owning many PCs. • To enable you to easily move PCs.

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

  3. 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

  4. 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.

  5. 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

  6. 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

  7. 802.11n • 802.11n is a recent amendment that improves upon the previous 802.11 standards by adding multiple input multiple-output antennas (MIMO) and many other newer features. • Two-stream (or two antenna) MIMO defines data rates up to 300 Mbps, three-stream up to 450 Mbps and four-stream up to 600 Mbps.

  8. Bluetooth

  9. Introduction to Wireless Applications Applications : • Voice and messaging, • Hand-held and other Internet-enabled devices, and • Data Networking.

  10. Bluetooth Overview • Wireless technology for short-range voice and data communication • Low-cost and low-power • Provides a communication platform between a wide range of “smart” devices • Not limited to “line of sight” communication • The technology uses omnidirectional radio waves that can transmit through walls and other non-metal barriers. • If there is interference from other devices, the transmission speed decreases but does not stop.

  11. Bluetooth • Allows users to form wireless connections between various communication devices, in order to transmit real-time voice and data communications. • Cable replacement technology. • Connect devices such as phone handsets, headsets, computer peripherals, etc. Establish short range radio links between mobile PCs, mobile phones and other portable devices. • Industry standard. • Allows wireless communication between devices.

  12. Radio Band • 2.4 GHz license-free ISM band. • Available worldwide. • Industrial, Scientific, Medical (ISM) band. • Unlicensed, globally available. • Centered around 2.4 GHz. • Frequency hopping is used. • 1MB/s.

  13. Bluetooth Applications Three general application areas using short-range wireless connectivity: • Data and voice access points. • Bluetooth facilitates real-time voice and data transmissions by providing effortless wireless connection of portable and stationary communications devices. • Cable replacement. • Bluetooth eliminates the need of cable attachments for connection of communications devices. Connections are instant and are maintained even when devices are not within line of sight. • The range of each radio is approximately 10 m, but can be extended to 100 m with an optional amplifier. • Ad hoc networking. • A device equipped with a Bluetooth radio can establish instant connection to another Bluetooth radio as soon as it comes into range.

  14. Bluetooth Security • Bluetooth technology is wireless and therefore susceptible to spying and remote access. • In almost all cases, Bluetooth users can establish "trusted devices" that can exchange data without asking permission.

  15. Bluetooth Security • Service-level security and device-level security work together to protect Bluetooth devices from unauthorized data transmission. • Security methods include authorization and identification procedures that limit the use of Bluetooth services to the registered user and require that users make a conscious decision to open a file or accept a data transfer. • A user can also simply switch his Bluetooth mode to "non-discoverable" and avoid connecting with other Bluetooth devices entirely.

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