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See also: Electromagnetic interference at 2.4 GHz § Wi-Fiįourteen channels are designated in the 2.4 GHz range, spaced 5 MHz apart from each other except for a 12 MHz space before channel 14. The following sub-bands are defined in the 802.11ah specifications: Thus, there is no global channels numbering plan, and the channels numbers are incompatible between world regions (and even between sub-bands of a same world region). Each world region supports different sub-bands, and the channels number depends on the starting frequency of the sub-band it belongs to. Ĩ02.11ah operates in sub-gigahertz unlicensed bands.
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AĬountries apply their own regulations to the allowable channels, allowed users and maximum power levels within these frequency ranges. Although channels are numbered at 5 MHz spacing, transmitters generally occupy at least 20 MHz, and standards allow for channels to be bonded together to form wider channels for higher throughput. In the standards, channels are numbered at 5 MHz spacing within a band (except in the 60 GHz band, where they are 2.16 GHz apart), and the number linearly relates to the centre frequency of the channel. Each range is divided into a multitude of channels. The 802.11 standard provides several distinct radio frequency bands for use in Wi-Fi communications: 900 MHz, 2.4 GHz, 3.6 GHz, 4.9 GHz, 5 GHz, 5.9 GHz, 6 GHz and 60 GHz. The radio frequency (RF) spectrum is vital for wireless communications infrastructure. Other equipment also accesses the same channels, such as Bluetooth. Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols, and equipment that does so is sold mostly under the trademark Wi-Fi.