The document defines and describes wireless local area networks (WLANs) and Cisco's Aironet 802.11a/b/g products. It discusses the benefits of WLANs, including flexibility and freedom of operation. It also identifies the characteristics of Cisco's wireless products, including their specifications, components, and applications in both indoor and outdoor environments.

1. Learning Objectives
• Define and describe WLANs
• Describe the need and benefits of WLANs.
Module 1 • Identify characteristics of Cisco Aironet
802.11a/b/g products.
Introduction to Wireless LANs
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What is WLAN? Benefits of WLANs
1. WLAN use a transmission medium just like wired LANs.
2. Use infrared Light (IR) or Radio Frequency (RF).
• RF - more popular
- Longer range
- Higher bandwidth
- Wider coverage
3. It use 2.4GHz and 5 GHz frequency bands.
4. Wireless networking provides
– freedom and flexibility to operate within or between buildings.
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-3 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-4
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2. Unlicensed Frequency Bands Wireless Technologies
WAN
(Wide Area Network)
MAN
(Metropolitan Area Network)
LAN
(Local Area Network)
PAN
(Personal Area
Network)
PAN LAN MAN WAN
802.11a, 11b, 11g 802.11 GSM, GPRS,
Standards Bluetooth HiperLAN2 MMDS, LMDS CDMA, 2.5–3G
Speed <1 Mbps 2–54+ Mbps 22+ Mbps 10–384 Kbps
Range Short Medium Medium–Long Long
PDAs, Mobile
Peer-to-Peer Enterprise Fixed, Last
Applications Device-to-Device Networks Mile Access
Phones, Cellular
Access
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-5 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-6
Wireless Technologies WLAN Evolution: 2000–Present
Warehousing
Retail
Healthcare
Education
Businesses
Home
Speed 860 Kbps 1 and 2 Mbps
1 and 2 Mbps 11 Mbps 54 Mbps
Network Proprietary Standards-based
Radio 900 MHz 2.4 GHz 2.4 GHz 5 GHz
IEEE 802.11Begins 802.11 802.11a,b 802.11g
Drafting Ratified Ratified Drafted
1986 1988 1990 1992 1994 1996 1998 2000 2002
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3. WLAN Devices
In-building Infrastructure Bridging
• 1200 Series (802.11a and 802.11b) • 350 Series (802.11b)
• 1100 Series (802.11b) •BR350
• 350 Series (802.11b) not shown •WGB350
• 1400 Series (802.11a)
Components and Topologies
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-9 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-10
WLAN Devices Cable, Accessories, Wireless IP Phone
Clients Cable and Accessories
Antenna
• 350 Series (802.11b) • Low Loss Cable
•2.4GHz
• 5 GHz client adapter (802.11a) • Antenna Mounts
•5 GHz Antennas
• Workgroup bridge (802.11b) • Lightening Arrestor
• Wireless IP Phone
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4. Cisco Aironet 802.11b Client Adapters Cisco Aironet 802.11a Client Adapter
5 GHz/802.11a
2.4 GHz
• 54 Mbps
• 802.11b
Rate Shifting
• 11 Mbps • 6, 9, 12, 18, 24, 36, 48, or 54
Include Fixed data rates
• PC Card • User configurable option
• PCI Card 5 dBi Patch Antenna
• LMC Card CardBus interface
Transmit power settings:
• Mini PCI
• 20 mW, 10 mW, and 5 mW
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-13 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-14
1200 Series Access Point Cisco Aironet 1100 Series Access Point
Dual radio design
Field upgradable radio and software Single 802.11b radio
– 802.11b radio • Time-tested technology
• 100 mW radio • Supports installed client-base
• Built-in RP-TNC connectors for Upgradable
diversity
• Migration path to 802.11g for further investment
• Wide range of Cisco 2.4 GHz return
antennas offered
Scalable
– 802.11a radio
• Fully functional access point ideal for all enterprise
• Delivers up to 54 Mbps, the deployments without expensive controllers
next generation of
performance Affordable
• Can run in dual mode capacity • Lowest priced upgradable Cisco Aironet access
with the 802.11b radio point
• Innovative antenna design to Enterprise-class features
fit deployment needs
• End-to-end intelligent networking and security
Enterprise-class management and extended to WLAN
security
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-15 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-16
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5. Cisco Aironet 1400 Series Antennas
High Performance •Indoor and Outdoor • Outdoor
•Industry leading throughput and range •WLAN and Bridging • Bridging
Easy-to-Use
•Out of the box installation in outdoor 2.4 GHz 5 GHz
environment
Flexible
•Point to point and point to multi-point
bridging
•Multiple mounting and antenna options
Secure
•Enterprise-class security
Feature Rich
•Intelligent Network Services via IOS
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-17 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-18
Cable and Accessories 802.11-Enabled Phones
A cordless phone for the
workplace
•Cisco 7920 Wireless VoIP
phone
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6. Beyond Laptops:
Other 802.11-Enabled Devices
HP iPAQ 5450 PDA Epson Printer
PDA’s
Phones
Printers
Projectors
Tablet PC’s
Compaq Tablet PC
Security Cameras
Barcode scanners SpectraLink WLAN Market
Phone
Custom devices for
vertical markets:
•Healthcare
•Manufacturing
•Retail
•Restaurants HHP Barcode Scanner Sharp M25X Projector
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In Building WLAN Site to Site WLAN
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7. WLAN Markets
Challenges and Issues
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Radio Signal Interference Power Consumption
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8. Wireless LAN Security:
Interoperability Lessons
“War Driving”
Hacking into WEP
Lessons:
• Security must be turned on (part of the installation process)
• Employees will install WLAN equipment on their own
(compromises security of your entire network)
• WEP keys can be easily broken (businesses need better security)
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Installation and Site Design Issues—
Reliability and Connectivity Bridging
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9. Installation and Site Design Issues—WLAN Health Issues
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Let’s Have you own WLAN!
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