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CSE5501: MOBILE & DISTRIBUTED COMPUTING SYSTEMS
Lecture 3: Wireless LANs
5
Wireless LANs
Wireless LANs
Wireless LANs
• The work on radio-based computer networks goes back to the early
seventies and the work on Aloha network.
• Wireless LANS are providing data rates typically 2 orders of magnitude
higher than outdoor radio. Thus, data rates exceeding 1 Mb/s are quite
common.
• WaveLAN provides peer-to-peer communication in 902-928 MHZ (in the
US) and uses direct sequence spreading with the CSMA/CA (carrier
sense, multiple acess, with collision avoidance) protocol.
• Standards such as IEEE 802.11 are being developed in the US and in
Europe. In general, the goal is to provide data rates exceeding 1 Mb/s and
also to support architectures with infrastructure (base stations) as well as
ad-hoc architectures where the terminals communicate directly with each
other (peer to peer) without the mediation of a fixed base station.
- Wireless Technologies 1
- & Networks 1
- Recommended References 2
- The wireless data 4
- Wireless LANs 5
- Wireless will replace wired? 7
- WLAN APPLICATIONS 8
- RESEARCH ISSUES 10
- WLAN Evolution: 2000 11
- Wireless LAN Applications 12
- Wireless Data Networks 13
- 902 - 928 MHz 16
- 2.4 - 2.4835 GHz 16
- 83.5 MHz 16
- (IEEE 802.11) 16
- • FSK DATA MODULATION 19
- 802.11 Protocol Layers 20
- Global RF Regulations 21
- Access Point Coverage 22
- FHSS - 1 Mbps and 2 Mbps 23
- DSSS – 2+ Mbps 23
- Infrared 23
- 802.11 compliant products 23
- Current proprietary products 23
- IEEE Project 802 charter: 26
- IEEE 802.11a Current Status 27
- IEEE 802.11x Enhancements 28
- 2.4GHz Protocol Issues 29
- 2.4GHz / 5GHz Industry Issues 30
- 2 and 802.11a that: 31
- Information Anytime, Anywhere 32
- Personal Area Wireless 34
- •Small business 35
- •Enterprise 35
- Ad Hoc Networks 36
- A Connected Home 37
- A Connected Small Office 38
- Enterprise 39
- An ISP Connected Public Space 41
- Allows ISP roaming agreements 42
- Wireless Architecture 44
- Overview, 802.11 Architecture 45
- Steps to Association: 46
- Steps to Re-association: 47
- • Mobile user connectivity 48
- Internet 49
- Microcellular Architecture 50
- Wireless Clients 51
- Wireless 51
- LAN Backbone 52
- Access Point 53
- Wireless Repeater 54
- System Redundancy 55
- ARLAN/Cisco Product Families 56
- 4800 Series 57
- 4500 Series 57
- 3500 Series 57
- All the features of the 58
- 4500 plus… 58
- 1, 2, 5.5 and 11 Mbps 58
- Same drivers, APs 58
- Access Points 59
- Configuration 60
- Diagnostics 60
- Statistics 60
- Top Panel LED’s 61
- Connect to Console 62
- Main Menu 63
- Configuration Menu 64
- Config Radio menu (AP’s) 65
- Config Radio menu (BR’s) 66
- 802.11 Menu 67
- Encryption Menu 68
- 802.11 Encapsulation Menu 69
- Encapsulation Menu (cont.) 70
- Radio Extended Menu (AP’s) 71
- Radio Extended Menu (BR’s) 72
- Ethernet Menu 73
- Identification Menu 74
- Identification Routing Menu 75
- Console Menu 76
- Time Menu 80
- Throughput Statistics 82
- Radio Statistics 83
- Radio Node Statistics 85
- Association Menu 86
- Association Table 87
- Filter Menu’s 88
- Multicast Filters 89
- Node Filtering 90
- Protocol Filtering 91
- Protocol Monitor 92
- Logs Menu 93
- Snmp Menu 94
- Diagnostics Network Menu 96
- Lecture 3: Wireless LANs 100
- STP Menu for BR’s 102
- ⇒ Flash upgrade to the client 103
- ⇒ Reconfigure the PC Card 103
- ⇒ Link Test 103
- Network Drivers 104
- Aironet Model Numbers 105
- Wireless Bridging 106
- 0 to 25 miles 107
- Building A Building B 107
- Building B 108
- Building C 108
- Building A 108
- New Addition to the system! 109
- 1 Mile @ any Datarate 110
- 25 Miles @ 2Mb 110
- 12 Miles @11Mb 110
- WLAN Infrastructure 112
- WLAN resources (1) 113
- WLAN resources (2) 114
- Suggested Reading 115
- Wireless LANs – IEEE 802.11 117
- • Bluetooth 118
- • GPRS & 3G 118
- • Mobile IP 118
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