1. Wireless Long-Term Issue 802.11 Wireless LANs Issues for Infrastructure Support Mark Poepping Carnegie Mellon Tucson CSG 2/4/2000

2. Issues Physical Management Other Stuff

3. Physical Issues Bandwidth Coverage Capacity Design Implementation Logistics

4. Bandwidth, Coverage Bandwidth of 2.4GHz 2Mb, 11Mb Mixed cell, mixed speed Coverage 6-20k sq ft 10k ‘typical’

5. Capacity Per Cell (csma/ca) 2Mb: 25 per cell; 11 Mb: ? per cell Multi-Channel Overlay or Allocation Infrastructure vs Local Cell Shape/Size Directional antenna (2-way) Perimeter threshold – not standard

6. Design Propagation Building Architecture/Materials Shielding (walls, cabinets, whiteboards) Waveguides (hallways) Interference Microwave oven, other 2.4 wireless Other AP’s Channel Reuse

7. Channel Overlap

8. Implementation Single AP Vendor (mgmt) Methodology Basic Layout (some tools available) Test and Measure Tweak and Retest Logistics Power and Wiring Aesthetics

9. Issues Physical Management Other Stuff

10. Management Issues Topology Roaming vs. Routing Airspace Reserved Channel?

11. Management Issues - 2 Security Access Network Name (open/closed) DHCP control Egress filtering WEP for small environments only Encryption - WEP is ineffective Key distribution doesn’t scale

12. Management Issues - 3 Configuration Management AP software Radio firmware (AP, client) Client driver Management Software

13. Management Issues - 4 Measurement and Troubleshooting Dynamic Environment enhances need No Enterprise tools Historical traffic analysis Proactive troubleshooting

14. Other Stuff Products Values/Benefits/Uses Coming Non 802.11 Stuff

15. Products Vendors (e.g.) Lucent WaveLan Cisco Aironet Nortel BayStack 600 Apple AirPort APs ~$300 NICs ~$100 5v PcCard (no 3.3v; no CFlash) HandSpring Springboard card

16. Values/Benefits/Uses On-Campus Ubiquitous access (really) Research environment Devices Human Factors Management Off-Campus Home networking (w/ DSL)

17. Coming 802.11a - 5.2GHz band 54Mb point-to-point Layout Tools Nortel Web-based simple costing CMU tool (Alex) - coverage/capacity

18. Non 802.11 Stuff Phone devices WAP Clippings Bluetooth

19. Wireless Long-Term Issue 802.11 Wireless LANs Issues for Infrastructure Support Mark Poepping Carnegie Mellon Tucson CSG 2/4/2000