Epo 4 6 global updating
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This was updated in 1999 with 802.11b to permit 11 Mbit/s link speeds, and this proved to be popular.
Manufacturers with membership in the Wi-Fi Alliance, whose products pass the certification process, gain the right to mark those products with the Wi-Fi logo.Alternative wireless technologies include mobile phone standards, such as 2G, 3G, 4G, and LTE.The name is sometimes written as Wi Fi, Wifi, or wifi, but these are not approved by the Wi-Fi Alliance.Hotspot coverage can be as small as a single room with walls that block radio waves, or as large as many square kilometres achieved by using multiple overlapping access points.Wi-Fi most commonly uses the 2.4 gigahertz (12 cm) UHF and 5.8 gigahertz (5 cm) SHF ISM radio bands.Wi-Fi compatible devices can connect to the Internet via a WLAN and a wireless access point.
Such an access point (or hotspot) has a range of about 20 meters (66 feet) indoors and a greater range outdoors.Specifically, the certification process requires conformance to the IEEE 802.11 radio standards, the WPA and WPA2 security standards, and the EAP authentication standard.Certification may optionally include tests of IEEE 802.11 draft standards, interaction with cellular-phone technology in converged devices, and features relating to security set-up, multimedia, and power-saving.The base version of the standard was released in 1997, and has had subsequent amendments.The standard and amendments provide the basis for wireless network products using the Wi-Fi brand.ALOHAnet and the ALOHA protocol were early forerunners to Ethernet, and later the IEEE 802.11 protocols, respectively. These frequency bands are the same ones used by equipment such as microwave ovens and are subject to interference.