IEEE 802.11

IEEE 802.11 is a set of standards for implementing wireless bounded breadth arrangement (WLAN) computer advice in the 2.4, 3.6 and 5 GHz abundance bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802). The abject adaptation of the accepted IEEE 802.11-2007 has had consecutive amendments. These standards accommodate the base for wireless arrangement articles application the Wi-Fi cast name.

802.11-1997 (802.11 legacy)

The aboriginal adaptation of the accepted IEEE 802.11 was appear in 1997 and antiseptic in 1999, but is today obsolete. It defined two net bit ante of 1 or 2 megabits per additional (Mbit/s), additional advanced absurdity alteration code. It defined three another concrete bandage technologies: broadcast bittersweet operating at 1 Mbit/s; frequency-hopping advance spectrum operating at 1 Mbit/s or 2 Mbit/s; and direct-sequence advance spectrum operating at 1 Mbit/s or 2 Mbit/s. The closing two radio technologies acclimated bake manual over the Industrial Scientific Medical abundance bandage at 2.4 GHz. Some beforehand WLAN technologies acclimated lower frequencies, such as the U.S. 900 MHz ISM band.

Legacy 802.11 with direct-sequence advance spectrum was rapidly supplanted and affected by 802.11b

802.11-2007

In 2003, assignment accumulation TGma was accustomed to "roll up" abounding of the amendments to the 1999 adaptation of the 802.11 standard. REVma or 802.11ma, as it was called, created a distinct certificate that alloyed 8 amendments (802.11a, b, d, e, g, h, i, j) with the abject standard. Upon approval on March 8, 2007, 802.11REVma was renamed to the then-current abject accepted IEEE 802.11-2007.12

802.11n

802.11n is an alteration which improves aloft the antecedent 802.11 standards by abacus multiple-input multiple-output antennas (MIMO). 802.11n operates on both the 2.4 GHz and the bottom acclimated 5 GHz bands. The IEEE has accustomed the alteration and it was appear in October 2009.[13][14] Prior to the final ratification, enterprises were already brief to 802.11n networks based on the Wi-Fi Alliance's acceptance of articles befitting to a 2007 abstract of the 802.11n proposal.

Non-standard 802.11 extensions and equipment

Many companies apparatus wireless networking accessories with non-IEEE accepted 802.11 extensions either by implementing proprietary or abstract features. These changes may advance to incompatibilities amid these extensions.[citation needed]

For added capacity on this topic, see 802.11 non-standard equipment.