Wi-Fi is the name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. The Wi-Fi Alliance, the organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi as any “wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers’ (IEEE) 802. 11 standards. ” A common misconception is that the term Wi-Fi is short for “wireless fidelity,” however this is not the case.
Wi-Fi is simply a trademarked term meaning IEEE 802. 1x. Initially, Wi-Fi was used in place of only the 2. 4GHz 802. 11b standard, however the Wi-Fi Alliance has expanded the generic use of the Wi-Fi term to include any type of network or WLAN product based on any of the 802. 11 standards, including 802. 11b, 802. 11a, dual-band, and so on, in an attempt to stop confusion about wireless LAN interoperability. Wi-Fi (also spelled Wifi or WiFi) is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections.
Only Wi-Fi products that complete Wi-Fi Alliance interoperability certification testing successfully may use the “Wi-Fi certified” trademark. A device that can use Wi-Fi (such as a personal computer, video-game console,smartphone, digital camera, tablet or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Wi-Fi products can do everything from sending email to streaming video and linking international video conference calls – even linking you to the Internet from a plane 10,000 feet in the air or just down the hallway.
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Internet Uses More in US are Online: · Approximately 38 % of all U.S. homes now have access to the Internet. · Approximately 100 million people (39 % of U.S. population) have been online at home. · A total of 60 million (23%) access the Internet at least once a month and are classified as active users. · Twenty-one of the top 35 local Internet markets have more than half of their population ...
Such an access point (or hotspot) has a range of about 20 meters (65 feet) indoors and a greater range outdoors. Hotspot coverage can comprise an area as small as a single room with walls that block radio waves or as large as many square miles — this is achieved by using multiple overlapping access points. Wi-Fi can be less secure than wired connections (such as Ethernet) because an intruder does not need a physical connection. Web pages that use SSL 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 2007, called Wi-Fi Protected Setup (WPS), had a serious flaw that allowed an attacker to recover the router’s password. [2] The Wi-Fi Alliance has since updated its test plan and certification program to ensure all newly certified devices resist attacks. Wi-Fi Support
Wi-Fi is supported by many applications and devices including video game consoles, home networks, PDAs, mobile phones, major operating systems, and other types of consumer electronics. Any products that are tested and approved as “Wi-Fi Certified” (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers. For example, a user with a Wi-Fi Certified product can use any brand of access point with any other brand of client hardware that also is also “Wi-Fi Certified”.
Products that pass this certification are required to carry an identifying seal on their packaging that states “Wi-Fi Certified” and indicates the radio frequency band used (2. 5GHz for 802. 11b, 802. 11g, or 802. 11n, and 5GHz for 802. 11a).
Wi-Fi Alliance In the mid-1990s, an international consortium of engineering experts from many technology companies began working together through an organization called IEEE (Institute of Electrical and Electronic Engineers, known as “I-triple E”), to develop industry standards for how these new wireless products should interact with each other.
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The Wireless Sensor Network for Home-Care System Using ZigBee Mao-Cheng Huang, Jyun-Ciang Huang, Jing-Cyun You, Gwo-Jia Jong Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807 Taiwan, ROC E-mail:[email protected], [email protected] Abstract In this paper, we presented the wireless sensor networks (WSN) to observe the human physiological ...
Out of that cooperation, the Wi-Fi Alliance® was born, and has taken those standards and developed test labs around the world to test and certify that products meet the standards of interoperability and security. An organization made up of leading wireless equipment and software providers with the missions of certifying all 802. 11-based products for interoperability and promoting the term Wi-Fi as the global brand name across all markets for any 802. 11-based wireless LAN products.
While all 802. 11a/b/g products are called Wi-Fi, only products that have passed the Wi-Fi Alliance testing are llowed to refer to their products as “Wi-Fi Certified” (a registered trademark).
Products that pass are required to carry an identifying seal on their packaging that states “Wi-Fi Certified” and indicates the radio frequency band used (2. 5GHz for 802. 11b or 11g, 5GHz for 802. 11a) This group was formerly known as the Wireless Ethernet Compatibility Alliance (WECA) but changed its name in October 2002 to better reflect the Wi-Fi brand it wants to build. Wireless The word wireless is dictionary defined as “having no wires”.
In networking terminology, wireless is the term used to describe any computer network where there is no physical wired connection between sender and receiver, but rather the network is connected by radio waves and/or microwaves to maintain communications. Wireless networking utilizes specific equipment such as NICs, APs and routers in place of wires (copper or optical fiber) for connectivity. How Wireless Networks Work A wireless network or Wireless Local Area Network (WLAN) serves the same purpose as a wired one — to link a group of computers.
Because “wireless” doesn’t require costly wiring, the main benefit is that it’s generally easier, faster and cheaper to set up. By comparison, creating a network by pulling wires throughout the walls and ceilings of an office can be labor-intensive and thus expensive. But even when you have a wired network already in place, a wireless network can be a cost-effective way to expand or augment it. In fact, there’s really no such thing as a purely wireless network, because most link back to a wired network at some point.
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... with a wireless network device. A personal computer with a wireless network adapter is known as a wireless client. Wireless clients can ... of implementing a WLAN. New security techniques and standards are constantly under development, and a comprehensive ... products that contain both bands (dual band), so they can provide real-world performance similar to the basic 10 Base wired Ethernet networks ...
The BasicsWi-Fi works with no physical wired connection between sender and receiver by using radio frequency (RF) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. The cornerstone of any wireless network is an access point (AP).
The primary job of an access point is to broadcast a wireless signal that computers can detect and “tune” into.
Since wireless networks are usually connected to wired ones, an access point also often serves as a link to the resources available on the a wired network, such as an Internet connection. In order to connect to an access point and join a wireless network, computers must be equipped with wireless network adapters. These are often built right into the computer, but if not, just about any computer or notebook can be made wireless-capable through the use of an add-on adapter plugged into an empty expansion slot, USB port, or in the case of notebooks, a PC Card slot.
Interoperability Interoperability means that products from different companies will work together, so users don’t get locked into a single brand of Wi-Fi products. Any of the more than 500 Wi-Fi Alliance member companies can submit products for certification, which means that you have a wide variety of choices in products, and can mix-and-match Wi-Fi certified products with the confidence that they will work together. wireless technology Standards Because there are multiple technology standards for wireless networking, it pays to do your homework before buying any equipment.
The most common wireless technology standards include the following: * 802. 11b: The first widely used wireless networking technology, known as 802. 11b (more commonly called Wi-Fi), first debuted almost a decade ago, but is still in use. * 802. 11g: In 2003, a follow-on version called 802. 11g appeared offering greater performance (that is, speed and range) and remains today’s most common wireless networking technology. * 802. 11n: Another improved standard called 802. 11n was developed in 2009. It uses multiple antennas to increase data rates from 54 Mbit/s to 600 Mbit/s. All of the Wi-Fi variants (802. 1b, g and n products) use the same 2. 4 GHz radio frequency, and as a result are designed to be compatible with each other, so you can usually use devices based on the different standards within the same wireless network. The catch is that doing so often requires special configuration to accommodate the earlier devices, which in turn can reduce the overall performance of the network. In an ideal scenario you’ll want all your wireless devices, the access point and all wireless-capable computers, to be using the same technology standard and to be from the same vendor whenever possible.
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... wireless network, but the main goal ofthe wireless network is to achieve a high level of connectivity. Total benefits of implementing the WLAN technology ... The Emulation Engine hardware is the size of a standard access point with dual dipole antenna on the back. Dave ... expanded the capabilities of its Emulation Engine Wi-Fi network testing product by adding a new version that supports user scalability ...
