Planet WML-3565 [32/34] Troubleshooting
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4 Troubleshooting
This chapter provides solutions to problems usually encountered during the installation and operation
of the adapter.
1. What is the IEEE 802.11g standard?
802.11g is the new IEEE standard for high-speed wireless LAN communications that provides for
up to 54 Mbps data rate in the 2.4 GHz band. 802.11g is quickly becoming the next mainstream
wireless LAN technology for the home, office and public networks.
802.11g defines the use of the same OFDM modulation technique specified in IEEE 802.11a for
the 5 GHz frequency band and applies it in the same 2.4 GHz frequency band as IEEE 802.11b.
The 802.11g standard requires backward compatibility with 802.11b.
The standard specifically calls for:
A. A new physical layer for the 802.11 Medium Access Control (MAC) in the 2.4 GHz frequency
band, known as the extended rate PHY (ERP). The ERP adds OFDM as a mandatory new
coding scheme for 6, 12 and 24 Mbps (mandatory speeds), and 18, 36, 48 and 54 Mbps
(optional speeds). The ERP includes the modulation schemes found in 802.11b including
CCK for 11 and 5.5 Mbps and Barker code modulation for 2 and 1 Mbps.
B. A protection mechanism called RTS/CTS that governs how 802.11g devices and 802.11b
devices interoperate.
2. What is MIMO?
MIMO (multiple-input multiple-output), a technique for boosting wireless bandwidth and range
by taking advantage of multiplexing. MIMO algorithms in a radio chipset send information out
over two or more antennas. The radio signals reflect off objects, creating multiple paths that in
conventional radios cause interference and fading. But MIMO uses these paths to carry more
information, which is recombined on the receiving side by the MIMO algorithms
Many wireless-LAN vendors expect that some form of MIMO will be the basis of work just starting
in the IEEE 802.11n Task Group, which is creating a specification for WLANs having at least
100M bit/sec throughput. MIMO doubles the spectral efficiency compared with that of current
WLANs.
3. What is the IEEE 802.11b standard?
The IEEE 802.11b Wireless LAN standard subcommittee, which formulates the standard for the
industry. The objective is to enable wireless LAN hardware from different manufactures to
communicate.
4. What does IEEE 802.11 feature support?
The product supports the following IEEE 802.11 functions:
z CSMA/CA plus Acknowledge Protocol
z Multi-Channel Roaming
z Automatic Rate Selection
z RTS/CTS Feature
z Fragmentation
z Power Management
28
Содержание
- 1g wireless mimo pcmcia adapter 1
- User s manual 1
- Wml 3565 wml 3565 1
- All brand and product names mentioned in this manual are trademarks and or registered trademarks of their respective holders 2
- Copyright 2
- Fcc caution 2
- Federal communication commission fcc radiation exposure statement 2
- Federal communication commission interference statement 2
- R tte compliance statement 2
- Safety 2
- Eu countries intended for use 3
- Revision 3
- Weee regulation 3
- Configuration utility 8 4
- Contents 4
- Installation procedure 3 4
- Introduction 1 4
- Troubleshooting 28 4
- Features 5
- Introduction 5
- Specifications 5
- Package contents 6
- Configuration utility installation 7
- Installation procedure 7
- Please click finish to complete the installation 9
- Driver installation 10
- Configuration utility 12
- Site survey 13
- Profile 14
- Configuration 3 configuration 15
- Configure the profile 15
- Authentication and security 17
- X setting certification 19
- 1 client requests to login the network 20
- 2 login with username password 20
- 3 send username password to radius server 20
- 4 approve or deny user login to the lan 20
- Ieee 802 x access client 20
- Radius client 20
- Radius server 20
- X setting ca server 22
- Link status 23
- Statistics 24
- Advance 25
- Wmm function 29
- Advanced settings 31
- Troubleshooting 32
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