Fi - Wikipedia, the free encyclopedia. Wi- Fi or Wi. Fi (/. A WLAN is usually password protected, but may be open, which allows any device within its range to access the resources of the WLAN network. The Wi- Fi Alliance defines Wi- Fi as any . Wi- Fi compatible devices can connect to the Internet via a WLAN network and a wireless access point. Such an access point (or hotspot) has a range of about 2. 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. Web pages that use TLS are secure, but unencrypted Internet access can easily be detected by intruders. Because of this, Wi- Fi has adopted various encryption technologies. The early encryption WEP proved easy to break. Higher quality protocols (WPA, WPA2) were added later. An optional feature added in 2. Wi- Fi Protected Setup (WPS), had a serious flaw that allowed an attacker to recover the router's password. ALOHAnet and the ALOHA protocol were early forerunners to Ethernet, and later the IEEE 8. A 1. 98. 5 ruling by the U. S. Federal Communications Commission released the ISM band for unlicensed use. The first wireless products were under the name Wave. LAN. They are the ones credited to inventing Wi- Fi. The Australian radio- astronomer Dr. This was updated in 1. The Wi- Fi Alliance had hired Interbrand to create a name that was . The yin- yang Wi- Fi logo indicates the certification of a product for interoperability. Alternative wireless technologies include mobile phone standards, such as 2. G, 3. G, 4. G, and LTE. The name is often written as Wi. Want to watch this again later? Sign in to add this video to a playlist. Free Download Link: http:// Home Page: http. Recently, I had a client that was not able to connect to his wireless network with the built-in wireless card on his laptop. Basically, the connection suddenly. AT&T BusinessDirect . AT&T BusinessDirect I’ve had a Netgear wireless router for about a year now and it’s been pretty good until a couple of weeks back all of sudden my wireless connection kept dropping. I cannot find 'Manage Network Connections' either in 'Control Panel' or 'Network and Sharing Centre' in Windows 7 Home premium on my Dell laptop. Fi or Wifi, but these are not approved by the Wi- Fi Alliance. Wi- Fi Ad Hoc Mode. Edit. Wi- Fi nodes operating in ad hoc mode refers to devices talking directly to each other without the need to first talk to an access point (also known as base station). Wi- Fi ad hoc mode was first invented and realized by Chai K Toh in his 1. Wi- Fi ad hoc routing, implemented on Lucent Wave. LAN 8. 02. 1. 1a wireless on IBM Think Pads over a 6 nodes scenario spanning a region of over a mile. The success was recorded in Mobile Computing magazine and later published formally in IEEE Transactions on Wireless Communications. Wi- Fi certification. Edit. The IEEE does not test equipment for compliance with their standards. The non- profit Wi- Fi Alliance was formed in 1. This includes wireless local area network (WLAN) connections, device to device connectivity (such as Wi- Fi Peer to Peer aka Wi- Fi Direct), Personal area network (PAN), local area network (LAN) and even some limited wide area network (WAN) connections. 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. Specifically, the certification process requires conformance to the IEEE 8. WPA and WPA2 security standards, and the EAP authentication standard. Certification may optionally include tests of IEEE 8. The lack of Wi- Fi certification does not necessarily imply that a device is incompatible with other Wi- Fi devices. They are created and maintained by the IEEELAN/MAN Standards Committee (IEEE 8. The base version of the standard was released in 1. The standard and amendments provide the basis for wireless network products using the Wi- Fi brand. While each amendment is officially revoked when it is incorporated in the latest version of the standard, the corporate world tends to market to the revisions because they concisely denote capabilities of their products. A dot with curved lines radiating from it is a common symbol for Wi- Fi, representing a point transmitting a signal. The combination of computer and interface controller is called a station. For all stations that share a single radio frequency communication channel, transmissions on this channel are received by all stations within range. A carrier wave is used to transmit the data. The data is organised in packets on an Ethernet link, referred to as . The coverage of one or more interconnected access points (hotspots) can extend from an area as small as a few rooms to as large as many square kilometres. Download our Calling Features Guide. FTC offers a wide range of long distance services. We will help you find the perfect fit for your business needs. How to Change Connection Priority of Wireless Networks in Windows 8 and 8.1 Information A network connection is a set of information that. Coverage in the larger area may require a group of access points with overlapping coverage. For example, public outdoor Wi- Fi technology has been used successfully in wireless mesh networks in London, UK. An international example is Fon. Wi- Fi provides service in private homes, businesses, as well as in public spaces at Wi- Fi hotspots set up either free- of- charge or commercially, often using a captive portal webpage for access. Organizations and businesses, such as airports, hotels, and restaurants, often provide free- use hotspots to attract customers. Enthusiasts or authorities who wish to provide services or even to promote business in selected areas sometimes provide free Wi- Fi access. Routers that incorporate a digital subscriber line modem or a cable modem and a Wi- Fi access point, often set up in homes and other buildings, provide Internet access and internetworking to all devices connected to them, wirelessly or via cable. Similarly, battery- powered routers may include a cellular Internet radiomodem and Wi- Fi access point. When subscribed to a cellular data carrier, they allow nearby Wi- Fi stations to access the Internet over 2. G, 3. G, or 4. G networks using the tethering technique. Many smartphones have a built- in capability of this sort, including those based on Android, Black. Berry, Bada, i. OS (i. Phone), Windows Phone and Symbian, though carriers often disable the feature, or charge a separate fee to enable it, especially for customers with unlimited data plans. Some laptops that have a cellular modem card can also act as mobile Internet Wi- Fi access points. Wi- Fi also connects places that normally don't have network access, such as kitchens and garden sheds. City- wide Wi- Fi. Edit. An outdoor Wi- Fi access point. In the early 2. 00. Wi- Fi networks. There are many successful examples; in 2. Mysore became India's first Wi- Fi- enabled city. A company called Wi. Fiy. Net has set up hotspots in Mysore, covering the complete city and a few nearby villages. Cloud, Florida and Sunnyvale, California, became the first cities in the United States to offer city- wide free Wi- Fi (from Metro. Fi). Seoul will grant leases to KT, LG Telecom and SK Telecom. The companies will invest $4. Carnegie Mellon University built the first campus- wide wireless Internet network, called Wireless Andrew, at its Pittsburgh campus in 1. Wi- Fi branding originated. Many universities collaborate in providing Wi- Fi access to students and staff through the eduroam international authentication infrastructure. Direct computer- to- computer communications. Edit. Wi- Fi also allows communications directly from one computer to another without an access point intermediary. This is called ad hoc Wi- Fi transmission. This wireless ad hoc network mode has proven popular with multiplayerhandheld game consoles, such as the Nintendo DS, Play. Station Portable, digital cameras, and other consumer electronics devices. Some devices can also share their Internet connection using ad hoc, becoming hotspots or . Because of this choice of frequency band, 8. Bluetooth devices. Spectrum assignments and operational limitations are not consistent worldwide: Australia and Europe allow for an additional two channels beyond the 1. United States for the 2. In the US and other countries, 8. Part 1. 5 of the FCC Rules and Regulations. A Wi- Fi signal occupies five channels in the 2. Any two channel numbers that differ by five or more, such as 2 and 7, do not overlap. The oft- repeated adage that channels 1, 6, and 1. Channels 1, 6, and 1. North America and the United Kingdom. In Europe and Japan using Channels 1, 5, 9, and 1. Wi- Fi pollution, or an excessive number of access points in the area, especially on the neighboring channel, can prevent access and interfere with other devices' use of other access points, caused by overlapping channels in the 8. SNR) between access points. This can become a problem in high- density areas, such as large apartment complexes or office buildings with many Wi- Fi access points. It is advised to only use channel 1- 6- 1. Additionally, other devices use the 2. It is also an issue when municipalities. The service set can be local, independent, extended or mesh. Each service set has an associated identifier, the 3. Service Set Identifier (SSID), which identifies the particular network. The SSID is configured within the devices that are considered part of the network, and it is transmitted in the packets. Receivers ignore wireless packets from networks with a different SSID. Throughput. Edit. As the 8. 02. 1. 1 specifications evolved to support higher throughput, the bandwidth requirements also increased to support them. According to a study, devices with the 8. Also, spaces where cables cannot be run, such as outdoor areas and historical buildings, can host wireless LANs. However, building walls of certain materials, such as stone with high metal content, can block Wi- Fi signals. Manufacturers are building wireless network adapters into most laptops. The price of chipsets for Wi- Fi continues to drop, making it an economical networking option included in even more devices. Products designated as . Unlike mobile phones, any standard Wi- Fi device will work anywhere in the world. Standard devices. Edit. An Atheros draft- N Wi- Fi adapter with built in Bluetooth on a Sony Vaio E series laptop. A wireless access point (WAP) connects a group of wireless devices to an adjacent wired LAN. An access point resembles a network hub, relaying data between connected wireless devices in addition to a (usually) single connected wired device, most often an Ethernet hub or switch, allowing wireless devices to communicate with other wired devices. Wireless adapters allow devices to connect to a wireless network. These adapters connect to devices using various external or internal interconnects such as PCI, mini.
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