How does WiFi work, exactly?
By Eric Fleischauer
DAILY Business Writer
email@example.com · 340-2435
WiFi, short for wireless fidelity, is all the rage, but how does it work?
Much the same as a walkie-talkie. Walkie-talkies convert sound into radio waves to transmit, then convert them back to sound to receive.
The problem is that walkie-talkies communicate at 49 megahertz, which means they can carry only a small amount of data, about 1,000 bits per second at best. WiFi transmits at up to 5 gigahertz, and higher frequency means more data, up to 54 megabits per second. That's fast enough for streaming video or other data-intensive applications.
Unlike most walkie-talkies, WiFi nodes can also switch frequencies automatically, reducing interference from other transmissions.
A WiFi node converts digital data — 1s and 0s — into radio waves, rather than converting voice. Digital data converts much more efficiently than a walkie-talkie, so the effective data stream is even higher.
Source: Wi-Fi Alliance, www.wi-fi.org.
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