1. Wireless Technology Matthew Gast Joint Techs February 2005 Salt Lake City, Utah

2. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast2 Why Wireless? Flexibility Ease of deployment of new users Adaption to fluid user populations Mobility Not security or ease of use, though…

3. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast3 Important Wireless Concepts Regulatory constraints No irradiating neighbors, even if you don’t like them Shannon limit - maximum data rate Forward error correction Some bits may be corrupted, but not all Corruption may be different for different users Spread spectrum Squish signal across a wide band

4. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast4 CDPD GSM Data HSCSD Buzzword Compliance Map speed distance Bluetooth GPRS ATSC 3G EV-DO WiMax (802.16) 802.11b WAN/community networking 802.11b 802.11a 802.11g (w/o protection) 802.11n? 11g (protected) EDGE RFC 1149

5. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast5 Bluetooth “Wireless wires” Profiles adapt technology to different uses Headset, serial port Common uses Keyboards, mice, etc. Connecting GPRS uplinks and headsets Slow (1-2 Mbps) to save power Frequency hopping to save power

6. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast6 Telco-based Wireless Higher-speed networks GSM: GPRS, EDGE, 3G CDMA: EV-DO Not very fast My experience is that GPRS peaks at 3 K/sec Generally charged by the bit When will they learn? But what else can you do at 70 mph?

7. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast7 ATSC Advanced Television Systems Committee Better known as digital TV For TV, an MPEG2 stream ~19.2 Mbps over TV coverage area See coverage area on FCC at http://www.fcc.gov/mb/video/tvq.html http://www.fcc.gov/mb/video/tvq.html HD requires full bandwidth; SD does not Spare capacity can be used for “datacasting”

8. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast8 802.11 “Wireless Ethernet” LAN replacement But not really LAN speed until recently Security is the big attention grabber Sit still for the talk after mine...

9. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast9 The Edge of 802.11 High density & high capacity networks 802.11a is very helpful here Better security with equal usability to wired backbone Admission control Keep your infestations out of my network Differentiated access and policy implementation

10. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast10 802.11 Implementation Challenges You have three channels in 802.11b/g Limited capacity and backwards compatibility 802.11n “Pre-n” products may not be upgradable to final standard Security standards are still emerging Macs don’t work in WPA mixed mode RF “etiquette” Local authorities can’t pre-empt FCC Part 15

11. 2005 Joint Techs, SLCCopyright © 2005 Matthew Gast11 Interesting Future Standards 802.1AE – MAC Security 802.1af – MAC Key Security 802.21 – Inter-IEEE 802 handoff

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