WiFi uses 802.11 networking standards
- 802.11b is inexpensive and the slowest. It transmits in the 2.4 GHz frequency band and can handle up to 11 megabits of data per second. It uses complementary code keying (CCK).
- 802.11a transmits at 5 GHz and can move 54 megabits of data per second. It uses a more efficient orthogonal frequency-division multiplexing (OFDM).
- 802.11g transmits at 2.4 GHz at 54 megabits per second. Network congestion makes that it can achieve only 24 megabits of data per second. It uses OFDM coding.
- 802.11n can transmit up to four streams of data, and can reportedly achieve speeds of 140 megabits per second.
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Difference between radios used for WiFi and cell phones
Radios used for WiFi connections are similar to radios used for walkie-talkies or cellphones - they transmit and receive radio waves. They can change 1s and 0s into radio waves or from radio waves to 1s and 0s.
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