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Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Linux
OL-1376-02
Chapter 1 Overview
Parts of the Client Adapter
Parts of the Client Adapter
The client adapter is composed of three major parts: a radio, a radio antenna, and light-emitting diodes
(LEDs).
Radio
The client adapter contains a direct-sequence spread spectrum (DSSS) radio that operates in the 2.4-GHz
license-free Industrial Scientific Medical (ISM) band. The radio transmits data over a half-duplex radio
channel operating at up to 11 Mbps.
DSSS technology causes radio signals to be transmitted over a wide frequency range, using multiple
frequencies simultaneously. The benefit of this technology is its ability to protect the data transmission
from interference. For example, if a particular frequency encounters noise, interference, or both, enough
redundancy is built into the signal on other frequencies that the client adapter usually will still be
successful in its transmission.
Radio Antenna
The type of antenna used depends on your client adapter:
• PC cards have an integrated, permanently attached diversity antenna. The benefit of the diversity
antenna system is improved coverage. The system works by allowing the card to switch and sample
between its two antenna ports in order to select the optimum port for receiving data packets. As a
result, the card has a better chance of maintaining the radio frequency (RF) connection in areas of
interference. The antenna is housed within the section of the card that protrudes from the PC card
slot when the card is installed.
• LM cards are shipped without an antenna; however, an antenna can be connected through the card’s
external connector. If a snap-on antenna is used, it should be operated in diversity mode. Otherwise,
the antenna mode used should correspond to the antenna port to which the antenna is connected.
• PCI client adapters are shipped with a 2-dBi dipole antenna that attaches to the adapter’s antenna
connector. However, other types of antennas can be used. PCI client adapters can be operated only
through the antenna port located on the right side of the radio module (not to be confused with the
antenna connector on the card carrier).
Note See the “Setting Advanced Infrastructure Parameters” section on page 5-16 for information on setting
the client adapter’s antenna mode.
Note External antennas used in combination with a power setting resulting in a radiated power level above 100
mW equivalent isotropic radiated power (EIRP) are not allowed for use within the European community
and other countries that have adopted the European R&TTE directive or the CEPT recommendation Rec
70.03 or both. For more details on legal combinations of power levels and antennas in those countries,
contact Cisco Corporate Compliance. See also the “Declaration of Conformity with Regard to the
R&TTE Directive 1999/5/EC” section on page D-4.
- Guide for Linux 1
- CONTENTS 3
- Contents 4
- 5 Advanced Configuration 5-1 5
- 6 Diagnostics 6-1 5
- 7 Routine Procedures 7-1 5
- 8 Troubleshooting 8-1 6
- Japanese Translation D-7 7
- English Translation D-7 7
- Audience 10
- Organization 10
- Conventions 11
- Attention 12
- Avvertenza 12
- Advarsel 12
- Related Publications 13
- Obtaining Documentation 13
- Ordering Documentation 14
- Documentation Feedback 14
- Cisco.com 14
- Technical Assistance Center 15
- Cisco TAC Escalation Center 16
- Overview 17
- Terminology 18
- Parts of the Client Adapter 19
- Chapter 1 Overview 20
- Ad Hoc Wireless LAN 21
- Site Survey 22
- Preparing for Installation 25
- Safety Information 26
- Unpacking the Client Adapter 27
- System Requirements 27
- Site Requirements 28
- PCMCIA Installation 32
- Enter (Figure 3-3) 33
- Figure 3-7 Make All Screen 37
- Option 1 for Red Hat Systems 38
- Option 2 for Red Hat Systems 39
- Verifying Installation 41
- Inserting a PC Card 42
- Additional Procedures 44
- Opening the Client Utilities 46
- Selecting the Radio 47
- Enabling LEAP 52
- Using the Bcard Utility 53
- Finishing the Installation 54
- Enabling Security Features 55
- Server-Based Authentication 56
- Getting Started 56
- Changing the Password 56
- Entering a New WEP Key 57
- Selecting an Existing WEP Key 59
- Enabling WEP 59
- Message Integrity Check (MIC) 60
- Advanced Configuration 63
- Setting Enterprise Parameters 65
- Table 5-2 System Parameters 66
- Network Type Description 67
- Authentication Description 69
- Setting RF Network Parameters 71
- Data Rate Description 72
- Diagnostics 83
- Chapter 6 Diagnostics 85
- Receive Statistics 90
- Transmit Statistics 91
- Routine Procedures 93
- Ascertaining the ACU Version 94
- Selecting a Help Browser 95
- Loading New Firmware 95
- Uninstalling Manually 97
- Removing a PC Card 99
- Removing a PCI Client Adapter 99
- OL-1376-02 100
- Removing the Client Adapter 100
- Troubleshooting 101
- Using the Indicator LEDs 102
- Getting Help 104
- (Figure 8-3) 105
- Technical Specifications 107
- Power output 109
- Receiver sensitivity 109
- APPENDIX 113
- Channel Sets 114
- Translated Safety Warnings 117
- Warning for Laptop Users 119
- ¡Advertencia! 120
- Varning! 120
- Information 121
- Tested To Comply 122
- With FCC Standards 122
- FOR HOME OR OFFICE USE 122
- Canadian Compliance Statement 123
- Liechtenstein 124
- Japanese Translation 127
- English Translation 127
- GLOSSARY 129
- Glossary 130
- OL-1367-02 130
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