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Wireless Ethernet (IEEE 802.11b)

Wireless Ethernet (IEEE 802.11b). Team-9 Zennon Fernandes Kiran Kumar Ka Kit. Wireless LAN?. Definition A data transmission system designed to provide location-independent network access between computing devices by using radio waves rather than cable infrastructure

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Wireless Ethernet (IEEE 802.11b)

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  1. Wireless Ethernet(IEEE 802.11b) Team-9 Zennon Fernandes Kiran Kumar Ka Kit

  2. Wireless LAN? • Definition • A data transmission system designed to provide location-independent network access between computing devices by using radio waves rather than cable infrastructure • IEEE 802.11 (1997) – Wireless LANs • IEEE 802.11b or 802.11 “High Rate” (1999) • Wireless Ethernet, 11 Mbps • WECA • Wi-Fi certification

  3. The Competitive Advantage • Mobility • Flexibility and scalability • Cost savings

  4. Applications • Dynamic environments • Old buildings, cost-effective network infrastructure solution • Temporary networks on exhibitions and seminars • Backup for mission-critical applications running on wired networks • Enterprise networks • Small / Home-office networks • Education – Schools and Universities

  5. Application Examples • Immediate bedside access to patient information for doctors and hospital staff. • Real-time access for on-site consultants and auditors. • Improved database access for roving supervisors such as production line mangers, warehouse auditors etc. • Real-time access to study group meetings and research links for students. • Location-independent access for network administrators, for easier on-site troubleshooting and support.

  6. 802.11b Technology • Architecture • Infrastructure mode • Ad Hoc mode • 802.11b Physical Layer • DSSS • CKK • QPSK • 802.11b MAC Layer • CSMA/ CA

  7. Infrastructure Mode 3Com Technical Paper, IEEE 802.11b Wireless LANs

  8. Ad Hoc mode 3Com Technical Paper, IEEE 802.11b Wireless LANs

  9. CSMA/ CA Protocols: RTS – Request to Send CTS – Clear to Send CSMA/ CA, Timing sequences.

  10. Roaming and Hand-off 3Com Technical Paper, IEEE 802.11b Wireless LANs

  11. Security • Wired Equivalent Privacy Security • Access Control • Encryption • ESSID (WLAN Service Area ID) • 40-bit shared-key RC4 algorithm (RSA)

  12. Range & Throughput • 802.11b data rate • 5 Mbps • 11 Mbps • Indoor range (typical) – 45 to 90 meters • Outdoor range – *Kilometers depends on external antenna • Throughput decreases with distance

  13. Attractiveness of WLANs • Wireless wherever you want to be • You don’t have to pull wires through your walls • Standards make cool things happen

  14. Dark Side of WLANs • You are the broadband wireless Internet DHCP server for your entire neighborhood • Being mobile does not mean wireless • Serious networking technology is still wired

  15. Making the Business Case The economic benefits can add up to as much as $16,000 per user - measured in worker productivity, organizational efficiency, revenue gain and cost savings - over wired alternatives.

  16. The END !

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