IEEE 802.11a
Unit: 12 Lesson: 1 aliases:
- 802.11a
- Wifi 2
the first wifi standard of all time i think
Wireless radios are configured to use a frequency band, or a section of the radio frequency spectrum. Network appliances and wireless hosts determine what bands are available to them given their adherence to the various 802.11 standards.
802.11a uses the 5 GHz frequency band and a multiplexed carrier scheme called OFDM, with a nominal data rate of 54 Mbps.
5 GHz Frequency Band (Raw Lesson Content)
The 5 GHz band is subdivided into 25 non-overlapping channels, each of which is 20 MHz wide. However, some of the channels work in a frequency range also used by radar. The 802.11h standard specifies a Dynamic Frequency Selection (DFS) method to scan for radar signals and prevent an access point from using channels that would cause interference. The exact use of channels can be subject to different regulations in different countries. Regulatory impacts also include a strict limit on power output, constraining the range of Wi-Fi devices.
#Netplus