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 !