© 2003, cisco systems, inc. all rights reserved. fwl 1.0—2-1 111 © 2003, cisco systems, inc. all...
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-1111© 2003, Cisco Systems, Inc. All rights reserved.
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-2
Module 2
IEEE 802.11 and Network Interface Cards
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-3
Learning Objectives
•Identify the IEEE 802. standards.
• Identify the IEEE 802.11 standards.
•Understand the MAC and PHY layers of 802.11
•Identify which client operating systems are supported.
•Determine the status of a client card by observing the indicator lights.
•Install and configure a Cisco Aironet PC Card.
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-4
Overview
This chapter will cover the IEEE 802.11 WLAN (WLAN) standards in detail, including data link and physical layer specifications. Throughout this module and this course, the terms IEEE and 802 are used often. This module provides a short overview of IEEE and the 802 committee. The MAC and physical layer services that have been standardized will be discussed. Finally, client adapters, driver types, and client support will also be discussed.
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-5
Key terms
• IEEE
• MAC
• PHY
• NIC
• STA
• MSDU
• PLCP
• PMD
• BSS
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-6
802.11 Standards
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-7
IEEE 802.11 Standards Activities
802.11a: 5GHz, 54Mbps
802.11b: 2.4GHz, 11Mbps
802.11d: Multiple regulatory domains
802.11e: Quality of Service (QoS)
802.11f: Inter-Access Point Protocol (IAPP)
802.11g: 2.4GHz, 54Mbps
802.11h: Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC)
802.11i: Security
802.11j: Japan 5GHz Channels (4.9-5.1 GHz)
802.11k: Measurement
802.11m: Maintenance
802.11n: High-Speed
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-8
802.11a / 5 GHz Band
Data rates supported: 54, 48, 36, 24, 12, and 6 Mbps•Client will automatically “downshift” to lower data rate when it gets further from AP
23 Countries have approved the use of 802.11a products:•U.S. Australia Austria Denmark France Sweden New ZealandIreland Japan Singapore TaiwanArgentina•U.K. Germany Norway Portugal Canada Belgium NetherlandsFinland Poland Switzerland Mexico
802.11h will ultimately permit worldwide usage of WLANs @ 5 GHz•Transmit Power Control (TPC)•Dynamic Frequency Selection (DFS)
5.470-5.725 GHz band being opened up (11 more channels)•This new 5.47-5.725 GHz band, plus 5.25-5.35 GHz UNII-2 band, will require DFS•Current UNII-2 products in the market will likely be grandfathered (i.e. no DFS)
5 GHz band has more channels than 2.4 GHz band•UNII-1 + UNII-2 = 8 channels (plus 11 future channels) vs. 3 channels for 2.4 GHz•However, depending on distance between AP’s, you may only be able to use half of the 5 GHz channels due to adjacent channel interference
5 GHz band subject to less interference than 2.4 GHz band•However, 2.4 GHz interference not a major problem in most business environments
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-9
Three Wireless Technologies
The Laws of Radio Dynamics:Higher Data Rates = Shorter Transmission RangeHigher Power Output = Increased Range, but Lower Battery LifeHigher Frequency Radios = Higher Data Rates Shorter Ranges
802.11b 802.11a 802.11g
2.4 GHz 5 GHz 2.4 GHz
Worldwide US/AP Worldwide
11 Mbps 54 Mbps 54 Mbps
FrequencyBand
Availability
MaximumData rate
Other Services(Interference)
Cordless Phones Microwave Ovens Wireless Video Bluetooth Devices
Cordless Phones Microwave Ovens Wireless Video Bluetooth Devices
HyperLAN Devices
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IEEE 802.11 Standard
IEEE 802.11 became a standard in July 1997• 2.4 GHz at 2 Mbps Frequency Hopping Spread Spectrum
(FHSS) and Direct Sequence Spread Spectrum (DSSS)
IEEE 802.11a and 802.11b became standards in September 1999• 802.11a – 5 GHz at 54 Mbps OFDM
• 802.11b – 2.4 GHz at 11 Mbps DSSS
IEEE 802.11g is scheduled to be ratified in 2003
• 802.11g – 2.4 GHz at 54 Mbps OFDM
802.11 promises “true” vendor interoperability
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Standards and Organizations
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-12
WLAN Speeds & Frequencies
802.11g2.4 GHz – OFDM/CCK
54 Mbps
Proprietary IEEE 802.11a/b Ratified
802.11a5 GHz – OFDM
54 Mbps
802.11b2.4 GHz – CCK
11 Mbps
Jan’99 Jan’00 Jan’01 Jan’02 Jan’03 Jan’04
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© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—2-13
What Is WLAN RF Technology?
Data sent over the air waves
Two-way radio communications (half duplex)
Same radio frequency for sending & receiving (transceiver)
No licensing required for Cisco Aironet Wireless products (in most countries)
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IEEE 802. Standards
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802.11 Architecture
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802.11 Physical (PHY) Layer Modulations
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Stations (STA)
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PHY Protocols
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Basic Service Set (BSS)
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Independent Basic Service Set (IBSS)
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Extended Service Set (ESS) and Distributed System (DS)
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MAC Layer
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MAC Services
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MAC Architecture
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CSMA
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Interframe Spaces
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PHY Layer
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PHY Functions
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802.11b
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2.4 GHz Channel Sets
Americas Americas Europe, Middle East and AsiaEurope, Middle East and Asia
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Center Frequency
Center Frequency
2412 MHz
2417 MHz
2422 MHz
2427 MHz
2432 MHz
2437 MHz
2442 MHz
2447 MHz
2452 MHz
2457 MHz
2462 MHz
2467 MHz
2472 MHz
2484 MHz
2412 MHz
2417 MHz
2422 MHz
2427 MHz
2432 MHz
2437 MHz
2442 MHz
2447 MHz
2452 MHz
2457 MHz
2462 MHz
2467 MHz
2472 MHz
2484 MHz
JapanJapan IsraelIsrael
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Regulatory DomainRegulatory DomainChannel IdentifierChannel Identifier
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Channels- 2.4 GHz DSSS
11 “chips per bit” means each bit sent redundantly
11 Mbps data rate
3 access points can occupy same area
11 Channels – each channel 22 MHz wide
1 set of 3 non-overlapping channels
14 Channels – each channel 22 MHz wide
4 sets of 3 non-overlapping channels, only one set used at a time
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802.11b Access Point Coverage
1 Mbps DSSS
5.5 Mbps DSSS
11 Mbps DSSS
2 Mbps DSSS
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802.11b Scalability
Blue = 11 Mbps
Green = 11 Mbps
Red = 11 Mbps
Total Theoretical Bandwidth = 33 Mbps
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Comparing the Technologies802.11a Data Rates
Modulation with Sub Channels
Modulation with Sub Channels
BPSKBPSK
Data Rate Per Subchannel
(Kbps)
Data Rate Per Subchannel
(Kbps)
BPSKBPSK
QPSKQPSK
125125
187.5187.5
250250
QPSKQPSK 375375
Total Data Rate (Mbps)
Total Data Rate (Mbps)
66
99
1212
1818
16QAM16QAM
16QAM16QAM
64QAM64QAM
500500
750750
10001000
64QAM64QAM 11251125
2424
3636
4848
5454
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802.11a Channel Sets
Am
eric
as (
-A)
Jap
an (
-J)
Sin
gap
ore
(-S
)
Tai
wan
(-T
)
34 5170 x36 5180 x x38 5190 x40 5200 x x42 5210 x44 5220 x x46 5230 x48 5240 x x52 5260 x x56 5280 x x60 5300 x x64 5320 x x
40 40 20 40
Channel Set
Cisco Maximum Peak Power (mW)*
Channel IDFrequency
(MHz)
Americas include:
Argentina
Australia
Austria
Brazil
Canada
Chile
Columbia
Denmark
France
Mexico
New Zealand
Panama
Peru
Sweden
United Kingdom
United States
Venezuela
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802.11a Access Point Coverage
OFDMOFDM54 Mbps54 Mbps
48 Mbps48 Mbps
36 Mbps36 Mbps
24 Mbps24 Mbps
18 Mbps18 Mbps
12 Mbps12 Mbps
09 Mbps09 Mbps
06 Mbps06 Mbps
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802.11a Scalability (Indoor UNII-1 and 2)
54 Mbps
54 Mbps
54 Mbps
Total Theoretical Bandwidth = 432 Mbps8 non-overlapping channels
54 Mbps
54 Mbps
54 Mbps
54 Mbps
54 Mbps
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Client Adapters
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Cisco Aironet 802.11b Client Adapters
2.4 GHz• 802.11b
• 11 Mbps
Include• PC Card
• PCI Card
• LMC Card
• Mini PCI
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802.11b PC Card
2.4 GHz/802.11b• 11 Mbps
Rate Shifting • 1, 2, 5.5, and 11Mbps
Fixed data rates • User configurable option
Integrated Antenna
PCMCIA interface
Transmit power settings:• 100 mW, 50 mW, 30 mW, 20 mW,
10 mW, 5 mW, and 1 mW
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802.11b LMC Card
2.4 GHz/802.11b• 11 Mbps
Rate Shifting • 1, 2, 5.5, and 11Mbps
Fixed data rates • User configurable option
PCMCIA interface
Transmit power settings:• 100 mW, 50 mW, 30 mW, 20
mW, 10 mW, 5 mW, and 1 mW
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802.11b PCI Card
2.4 GHz/802.11b• 11 Mbps
Rate Shifting • 1, 2, 5.5, and 11Mbps
Fixed data rates • User configurable option
RP-TNC Connector
PCMCIA interface
Transmit power settings:• 100 mW, 50 mW, 30 mW, 20 mW,
10 mW, 5 mW, and 1 mW
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802.11b Mini PCI Adapter
2.4 GHz/802.11b embedded wireless for notebooks
100 mW transmit power
Must order through PC manufactures (not orderable directly through Cisco)
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802.11a CardBus2 Client Adapter
5 GHz/802.11a• 54 Mbps
Rate Shifting • 6, 9, 12, 18, 24, 36, 48, or 54
Fixed data rates • User configurable option
5 dBi Patch Antenna
CardBus interface
Transmit power settings:• 20 mW, 10 mW, and 5 mW
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PC Card LEDs
Dual LED helps identify the card status
• Green LED is the Status LED
• Orange LED is the RF traffic LED
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LED Status
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Windows Drivers
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Linux and Macintosh Drivers
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Downloading Drivers and Software
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Ad-Hoc
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Infrastructure
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Aironet Client Utility: Main Screen
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Aironet Client Utility: Loading Firmware
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Aironet Client Utility: Profile Manager
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Aironet Client Utility: Adding a Profile
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Profile: System Parameters
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Profile: RF Network
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Profile: RF Network
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Profile: Advanced (Infrastructure)
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Profile: Advanced (Ad Hoc)
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Profile: Network Security
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Aironet Client Utility: Status
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Aironet Client Utility: Statistics
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Aironet Client Utility: Link Test
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Aironet Client Utility: Site Survey
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Link Status Meter
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Installing the Client Adapter
Insert the adapter card into the PCMCIA slot in the PC
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Task 4: ACU Install and Setup
From the UTILS folder on the driver CD, run SETUP
SETUP
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Task 4: ACU Install and Setup (cont.)
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Task 4: ACU Install and Setup (cont.)
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Task 4: ACU Install and Setup (cont.)
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Task 4: ACU Install and Setup (cont.)
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Task 4: ACU Install and Setup (cont.)
Aironet Client Utility (ACU)
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Task 4: ACU Install and Setup (cont.)
Step 12
Step 13
Step 14
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Task 4: ACU Install and Setup (cont.)
Step 16
Step 17
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Summary
• Identify characteristics of Cisco Aironet 802.11a products.
• Identify characteristics of Cisco Aironet 802.11b products.
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777777© 2003, Cisco Systems, Inc. All rights reserved.