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TekSpek 's
Wi-Fi
Date issued:
The underlying principle of WiFi is that computers communicate with one another over a radio frequency in much the same way that handheld transceiver are used by friends to chat with one another on the road. One key difference, though, is the bandwidths each uses.
Handhelds transmits on a frequency of around 50MHz but 802.11b and 802.11g devices transmit on the 2.4GHz band and 802.11a use 5GHz. These higher frequencies provide much greater bandwidth for information to be transferred.
802.11b devices can also transmit on several smaller bands within their allotted spectrum and can hop rapidly between them. This helps prevent interference and allows multiple WiFi devices to communicate without causing problems with each other.
And that's important because WiFi isn't intended to serve just a few users at home or in an office – it's also supposed to handle large numbers of users and be suitable for laptops that get out and about. Many modern portable PCs have onboard WiFi hardware as standard, but those that don't can be kitted out quite cheaply with a CardBus or USB-dongle solution.
