Wireless Ethernet (IEEE b) 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 IEEE (1997) – Wireless LANs IEEE b or “High Rate” (1999) –Wireless Ethernet, 11 Mbps WECA – Wi-Fi certification

The Competitive Advantage Mobility Flexibility and scalability Cost savings

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

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.

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

Infrastructure Mode 3Com Technical Paper, IEEE b Wireless LANs

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

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

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

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

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

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

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

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.

The END !