Wireless Fidelity[Wi-Fi]

Wireless Fidelity or Wi-Fi is having a standard set of terms that is used for Wireless Local Network (Wireless Local Area Networks - WLANs) based on IEEE 802.11 specification. Latest standard specifications 802.11a or b, such as 802.16 g, is currently in preparation, the new specification offers many improvements ranging from broad coverage to further transfer speed.Wi-Fi originally intended for the use of wireless devices and Local Area Network (LAN), but now more widely used to access the Internet. These enable anyone with a computer with a wireless card (wireless card) or personal digital assistant (PDA) to connect to the internet using access point (or known as hotspots) nearby.Table of Contents [hide]1 Specifications2 Wi-Fi HardwareAccess Mode 3 Wi-Fi Connection3.1 Ad-Hoc3.2 InfrastructureSecurity System 4 Wi-FiPopularity 5 Wi-Fi [edit] SpecificationsWi-Fi was designed based on the IEEE 802.11 specification. Today there are four variations of 802.11, namely:802.11a802.11b802.11g802.11nSpecification b is the first product of Wi-Fi. Variation g and n is one product that has the most sales in 2005.Wi-Fi Specifications Specifications Speed FrequencyBand Matchwith802.11b 11 Mb / s ~ 2.4 GHz b802.11a 54 Mb / s ~ 2.4 GHz a802.11g 54 Mb / s ~ 2.4 GHz b, g802.11n 100 Mb / s ~ 5 GHz, b, g, nIn many parts of the world, the frequencies used by Wi-Fi, users are not required to obtain permission from local regulators (eg, the Federal Communications Commission in the U.S.). 802.11a uses a higher frequency and therefore a narrower coverage, others the same.Wi-Fi version of the most extensive in the U.S. market today (based in IEEE 802.11b / g) operates at 2400 MHz to 2483.50 MHz. With so allows operation in 11 channels (each 5 MHz), centered on the following frequencies:Channel 1 to 2.412 MHz;Channel 2 to 2.417 MHz;Channel 3 to 2.422 MHz;Channel 4 to 2.427 MHz;Channel 5 to 2.432 MHz;Channel 6 to 2.437 MHz;Channel 7 to 2.442 MHz;Channel 8 to 2.447 MHz;Channel 9 to 2.452 MHz;Channel 10 to 2.457 MHz;Channel 11 to 2.462 MHzTechnically operational, Wi-Fi is one variant of communication and information technology that works on the network and devices WLAN (wireless local area network). In other words, Wi-Fi is a certification trademark given to telecommunications equipment manufacturers (Internet) working in WLAN networks and has the capacity to meet the quality required interoperasi.Internet technology-based Wi-Fi built and developed in the United States a group of engineers who worked at the Institute of Electrical and Electronis Engineers (IEEE) technical standard based on numbered device 802.11b, 802.11a and 802.16. Wi-Fi devices are not only able to work on WLAN networks, but also on the Wireless network Metropolitan Area Network (WMAN).Because of technical standards for devices with 802.11b WLAN devices intended for use in the 2.4 GHz frequency or frequencies commonly known as ISM (Industrial, Scientific and Medical). As for devices 802.11a technical standard and the 802.16 WMAN device designed for, or also called Wi-Max, who works at around 5 GHz frequency band.The high public interest - particularly among the community of the Internet - using Wi-Fi technology because at least two factors. First, ease of access. This means that users in one area can access the Internet simultaneously without having to be bothered with cables.Consequently, users who want to do surfing or browsing news and information on the Internet, just bring PDA (pocket digital assistance), or laptop capable Wi-Fi to the place where there is access point or hotspot.The proliferation of hotspots in these places - which is built by telecommunications operators, Internet service providers and even private individuals - triggered a second factor, namely because construction costs are relatively cheap or 300 dollar range only the United States.Increasing the quantity of Internet users based on Wi-Fi technology is increasingly menggejala in various parts of the world, has encouraged Internet service providers (ISPs) to build hotspots in major cities of the world.Some observers have even predicted in the year 2006, there will be 800,000 hotspots in many European countries, 530,000 in the United States and one million in Asian countries.The overall amount of income derived by the United States and European countries from the Internet-based business Wi-Fi technology by the end of 2003 was estimated at 5.4 trillion U.S. dollars, or an increase of 33 billion U.S. dollars from 2002 (www.analysys.com).[edit] Wi-Fi Hardware Wi-fi in the form of wi-fi PCIHardware on the market today is in the form of:PCIUSBPCMCIACompact Flash Wi-fi in the form of USB [edit] Access mode Wi-Fi ConnectionThere are 2 access mode Wi-Fi connection, ie[edit] Ad-HocThis connection mode is a mode where multiple computers are connected directly, or better known as Peer-to-Peer. Advantages, cheaper and more practical if the connection is only 2 or 3 computers, without having to buy the access point[edit] InfrastructureUsing the Access Point that serves as data traffic, allowing many client can connect to each other through a network (Network).[edit] Security Systems Wi-FiThere are several types of security settings for Wi-Fi networks, among others:WPA Pre-Shared KeyWPA RADIUSWPA2 Pre-Shared Key MixedRADIUS WPA2 MixedRADIUSWEP[edit] The popularity of Wi-FiIn Indonesia itself, the use of Internet-based Wi-Fi has started menggejala in several major cities. In Jakarta, for example, the maniacs who are surfing the Internet while waiting for the plane take off at the airport waiting room, was not an alien thing.The same phenomenon seen in several cafes - like a Starbucks Cafe and La Moda Cafe in Plaza Indonesia, Senayan Coffee Club, and Cafe Coffee Bean in Cilandak Town Square - where the visitor can open the Internet to see political news or gossip latest artist while sipping a hot cappuccino .Today, business-based phone VoIP (Voice over Internet Protocol) has also been using Wi-Fi technology, which forwarded phone calls through WLAN networks. Application is named VoWi-FI (voice over Wi-Fi).Some time ago, the technical standard IEEE recent creations have been able to support the operation of the streaming video service. Even predicted, will be made cards (card)-based Wi-Fi technology that can be inserted into electronic equipment, ranging from digital cameras to video game consoles (ITU News 8 / 2003).Based on the above description, it can be concluded that the quantity of business and technology users Wi-Fi tends to increase, and it is economically positive implications for the national economy of a country, including Indonesia.Nevertheless, the government should address the phenomenon wisely and carefully. The reason, technologically frequencies - both 2.4 GHz and 5 GHz - which became operational container Wi-Fi technology is not free of limitations (Kompas, 5/2/2004).Because the users in a new area can take advantage of this wireless Internet system with optimal, if all the equipment used in the area using a uniform transmit power and limited.If the prerequisites are not ignored, it is certain harmful interference will occur not only between devices on the Internet, but also with other telecommunications systems devices.If interference continues - because users want more superior than other users, and thus a lack of understanding of the limitations of the technology - in the end will make 2.4 GHz frequency and 5 GHz could not be utilized optimally.Another limitation of the two wireless frequencies (particularly 2.4 GHz) is due also be used for ISM (industrial, science and medical).Consequently, the use of radio communications or other telecommunication device that works in the frequency band should be ready to accept interference from ISM devices, as stated in S5.150 of the Radio Regulations.In ITU-R recommendations SM.1056, informed ISM devices are also characteristics that essentially aims to prevent the emergence of interference, both between devices with the ISM or lainnnya telecommunication devices.The same recommendation affirms that every member of the ITU-free set administrative requirements and legal rules relating to the obligation limitation.Recognizing the limitations and the impact that may arise from the use of two wireless frequencies, various countries and impose regulations that limit the transmit power of the devices used.Retrieved from "http://id.wikipedia.org/wiki/Wi-Fi"Category: Wireless Networking Wi-Fi


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Wireless Fidelity or Wi-Fi is having a standard set of terms that is used for Wireless Local Network (Wireless Local Area Networks - WLANs) based on IEEE 802.11 specification. Latest standard specifications 802.11a or b, such as 802.16 g, is currently in preparation, the new specification offers many improvements ranging from broad coverage to further transfer speed.Wi-Fi originally intended for the use of wireless devices and Local Area Network (LAN), but now more widely used to access the Internet. These enable anyone with a computer with a wireless card (wireless card) or personal digital assistant (PDA) to connect to the internet using access point (or known as hotspots) nearby.Table of Contents [hide]1 Specifications2 Wi-Fi HardwareAccess Mode 3 Wi-Fi Connection3.1 Ad-Hoc3.2 InfrastructureSecurity System 4 Wi-FiPopularity 5 Wi-Fi
[edit] SpecificationsWi-Fi was designed based on the IEEE 802.11 specification. Today there are four variations of 802.11, namely:802.11a802.11b802.11g802.11nSpecification b is the first product of Wi-Fi. Variation g and n is one product that has the most sales in 2005.Wi-Fi Specifications Specifications Speed FrequencyBand Matchwith802.11b 11 Mb / s ~ 2.4 GHz b802.11a 54 Mb / s ~ 2.4 GHz a802.11g 54 Mb / s ~ 2.4 GHz b, g802.11n 100 Mb / s ~ 5 GHz, b, g, nIn many parts of the world, the frequencies used by Wi-Fi, users are not required to obtain permission from local regulators (eg, the Federal Communications Commission in the U.S.). 802.11a uses a higher frequency and therefore a narrower coverage, others the same.Wi-Fi version of the most extensive in the U.S. market today (based in IEEE 802.11b / g) operates at 2400 MHz to 2483.50 MHz. With so allows operation in 11 channels (each 5 MHz), centered on the following frequencies:Channel 1 to 2.412 MHz;Channel 2 to 2.417 MHz;Channel 3 to 2.422 MHz;Channel 4 to 2.427 MHz;Channel 5 to 2.432 MHz;Channel 6 to 2.437 MHz;Channel 7 to 2.442 MHz;Channel 8 to 2.447 MHz;Channel 9 to 2.452 MHz;Channel 10 to 2.457 MHz;Channel 11 to 2.462 MHzTechnically operational, Wi-Fi is one variant of communication and information technology that works on the network and devices WLAN (wireless local area network). In other words, Wi-Fi is a certification trademark given to telecommunications equipment manufacturers (Internet) working in WLAN networks and has the capacity to meet the quality required interoperasi.Internet technology-based Wi-Fi built and developed in the United States a group of engineers who worked at the Institute of Electrical and Electronis Engineers (IEEE) technical standard based on numbered device 802.11b, 802.11a and 802.16. Wi-Fi devices are not only able to work on WLAN networks, but also on the Wireless network Metropolitan Area Network (WMAN).Because of technical standards for devices with 802.11b WLAN devices intended for use in the 2.4 GHz frequency or frequencies commonly known as ISM (Industrial, Scientific and Medical). As for devices 802.11a technical standard and the 802.16 WMAN device designed for, or also called Wi-Max, who works at around 5 GHz frequency band.The high public interest - particularly among the community of the Internet - using Wi-Fi technology because at least two factors. First, ease of access. This means that users in one area can access the Internet simultaneously without having to be bothered with cables.Consequently, users who want to do surfing or browsing news and information on the Internet, just bring PDA (pocket digital assistance), or laptop capable Wi-Fi to the place where there is access point or hotspot.The proliferation of hotspots in these places - which is built by telecommunications operators, Internet service providers and even private individuals - triggered a second factor, namely because construction costs are relatively cheap or 300 dollar range only the United States.Increasing the quantity of Internet users based on Wi-Fi technology is increasingly menggejala in various parts of the world, has encouraged Internet service providers (ISPs) to build hotspots in major cities of the world.Some observers have even predicted in the year 2006, there will be 800,000 hotspots in many European countries, 530,000 in the United States and one million in Asian countries.The overall amount of income derived by the United States and European countries from the Internet-based business Wi-Fi technology by the end of 2003 was estimated at 5.4 trillion U.S. dollars, or an increase of 33 billion U.S. dollars from 2002 (www.analysys.com).[edit] Wi-Fi Hardware
Wi-fi in the form of wi-fi PCIHardware on the market today is in the form of:PCIUSBPCMCIACompact Flash
Wi-fi in the form of USB [edit] Access mode Wi-Fi ConnectionThere are 2 access mode Wi-Fi connection, ie[edit] Ad-HocThis connection mode is a mode where multiple computers are connected directly, or better known as Peer-to-Peer. Advantages, cheaper and more practical if the connection is only 2 or 3 computers, without having to buy the access point[edit] InfrastructureUsing the Access Point that serves as data traffic, allowing many client can connect to each other through a network (Network).[edit] Security Systems Wi-FiThere are several types of security settings for Wi-Fi networks, among others:WPA Pre-Shared KeyWPA RADIUSWPA2 Pre-Shared Key MixedRADIUS WPA2 MixedRADIUSWEP[edit] The popularity of Wi-FiIn Indonesia itself, the use of Internet-based Wi-Fi has started menggejala in several major cities. In Jakarta, for example, the maniacs who are surfing the Internet while waiting for the plane take off at the airport waiting room, was not an alien thing.The same phenomenon seen in several cafes - like a Starbucks Cafe and La Moda Cafe in Plaza Indonesia, Senayan Coffee Club, and Cafe Coffee Bean in Cilandak Town Square - where the visitor can open the Internet to see political news or gossip latest artist while sipping a hot cappuccino .Today, business-based phone VoIP (Voice over Internet Protocol) has also been using Wi-Fi technology, which forwarded phone calls through WLAN networks. Application is named VoWi-FI (voice over Wi-Fi).Some time ago, the technical standard IEEE recent creations have been able to support the operation of the streaming video service. Even predicted, will be made cards (card)-based Wi-Fi technology that can be inserted into electronic equipment, ranging from digital cameras to video game consoles (ITU News 8 / 2003).Based on the above description, it can be concluded that the quantity of business and technology users Wi-Fi tends to increase, and it is economically positive implications for the national economy of a country, including Indonesia.Nevertheless, the government should address the phenomenon wisely and carefully. The reason, technologically frequencies - both 2.4 GHz and 5 GHz - which became operational container Wi-Fi technology is not free of limitations (Kompas, 5/2/2004).Because the users in a new area can take advantage of this wireless Internet system with optimal, if all the equipment used in the area using a uniform transmit power and limited.If the prerequisites are not ignored, it is certain harmful interference will occur not only between devices on the Internet, but also with other telecommunications systems devices.If interference continues - because users want more superior than other users, and thus a lack of understanding of the limitations of the technology - in the end will make 2.4 GHz frequency and 5 GHz could not be utilized optimally.Another limitation of the two wireless frequencies (particularly 2.4 GHz) is due also be used for ISM (industrial, science and medical).Consequently, the use of radio communications or other telecommunication device that works in the frequency band should be ready to accept interference from ISM devices, as stated in S5.150 of the Radio Regulations.In ITU-R recommendations SM.1056, informed ISM devices are also characteristics that essentially aims to prevent the emergence of interference, both between devices with the ISM or lainnnya telecommunication devices.The same recommendation affirms that every member of the ITU-free set administrative requirements and legal rules relating to the obligation limitation.Recognizing the limitations and the impact that may arise from the use of two wireless frequencies, various countries and impose regulations that limit the transmit power of the devices used.Retrieved from "http://id.wikipedia.org/wiki/Wi-Fi"Category: Wireless Networking Wi-Fi