WIFI Specifications

Wi-Fi is based on the IEEE 802.11 specifications. There are currently four deployed 802.11 variations: 802.11a, 802.11b, 802.11g, and 802.11n.

The b standard permits up to 11Megabits/second, while both a and g allow up to 54Mbs. The new n specification will allow even higher speeds (up to 100Mbs and beyond). The 802.11a standard works in the 5GHz frequency band, and the others work in the 2.4GHz band. In fact, n is a superset of g , and g is a superset of b , so there is some interoperability among them. In most of the world, these frequencies do not require user licenses from local regulators (eg, the Federal Communications Commission in the US).

The most widespread version of Wi-Fi in the US market today (based in IEEE 802.11b/g) operates in the 2,400 MHz to 2,483.50 MHz. It allows to operate in 11 channels (5 MHz each), as follows

Channel 1 – 2,412 MHz; Channel 2 – 2,417 MHz; Channel 3 – 2,422 MHz; Channel 4 – 2,427 MHz; Channel 5 – 2,432 MHz; Channel 6 – 2,437 MHz; Channel 7 – 2,442 MHz; Channel 8 – 2,447 MHz; Channel 9 – 2,452 MHz; Channel 10 – 2,457 MHz; Channel 11 – 2,462 MHz

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