Ībout the same time in The Netherlands in 1991, the NCR Corporation with AT&T Corporation invented the precursor to 802.11, intended for use in cashier systems, under the name WaveLAN. Ī prototype test bed for a wireless local area network (WLAN) was developed in 1992 by a team of researchers from the Radiophysics Division of the CSIRO (Commonwealth Scientific and Industrial Research Organisation) in Australia, led by Dr John O'Sullivan. These frequency bands include the same 2.4 GHz bands used by equipment such as microwave ovens, and are thus subject to interference. Federal Communications Commission released parts of the ISM bands for unlicensed use for communications. Channels can be shared between networks, but, within range, only one transmitter can transmit on a channel at a time.Ī 1985 ruling by the U.S. Wi-Fi most commonly uses the 2.4 gigahertz (120 mm) UHF and 5 gigahertz (60 mm) SHF radio bands these bands are subdivided into multiple channels. Different versions of Wi-Fi are specified by various IEEE 802.11 protocol standards, with different radio technologies determining radio bands, maximum ranges, and speeds that may be achieved. Compatible devices can network through wireless access points with each other as well as with wired devices and the Internet. Wi-Fi uses multiple parts of the IEEE 802 protocol family and is designed to work seamlessly with its wired sibling, Ethernet.
As of 2019, over 3.05 billion Wi-Fi-enabled devices are shipped globally each year. As of 2017, the Wi-Fi Alliance consisted of more than 800 companies from around the world. Wi-Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term " Wi-Fi Certified" to products that successfully complete interoperability certification testing. These are the most widely used computer networks in the world, used globally in home and small office networks to link devices together and to a wireless router to connect them to the Internet, and in wireless access points in public places like coffee shops, hotels, libraries, and airports to provide visitors with Internet connectivity for their mobile devices. Wi-Fi ( / ˈ w aɪ f aɪ/) is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.
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