What Is wIFI

According to wikipedia: Wi-Fi was originally a brand name given by the Wi-Fi Alliance to describe the embedded technology, wireless local area network (WLAN) based on the IEEE 802.11 standard. In 2007, the general term Wi-Fi has expanded describes generic wireless interface of mobile computing devices, such as laptops in Lans. The term Wi-Fi was chosen as a play on the term "Hi-Fi", and is often mistaken to be incorrect abbreviation for wireless fidelity. Wi-Fi and Wi-Fi Certified logo are registered trademarks of the Wi-Fi Alliance, the trade organization that tests and certifies equipment in accordance with the 802.11x standards.
If you've been in a coffee shop, restaurant, hotel or campus, usually right in the middle of your wireless network. Many of us use wireless networks, also called WiFi or 802.11 networking, to connect the computers in our house, and now the increasing number of cities use the technology to provide free or cheap Internet access to residents. At the close the day, the wireless network can become so widespread that we can access the Internet almost anywhere at any time, without using cables, so wonderful life.
A wireless network uses radio waves, such as mobile phone, tv and radio do. In fact, communication via a wireless network much as two-way radio communication. This is what happens:

1. A computer wireless adapter translates data into radio signals and transmits the indoor or outdoor antenna.
2. A wireless router receives the signal and decodes it. He sends information to the Internet using a physical, Ethernet cable connection.

This process also works vice versa, with the router receiving data from the Internet, translating into radio signals and sends them to the computer via a wireless adapter.

Radio is used for WiFi communication are the same as that used for radio walkie-talking, handphones and other devices. They can send and receive radio waves, and they can convert 1s and 0s into radio waves and convert the radio waves back into 1s and 0s. WiFi radio but there are some important differences from other radio:

* They send in the frequency of 2.4 GHz or 5GHz. This frequency is very high compared with the frequency used for mobile phones, walkie-talking and television. The higher frequency allows the signal to carry more data.
* They use 802.11 networking standards, which come in several flavors:
o 802.11b version is the first to reach the market. There is a slow and least expensive standard, and it becomes a little more quickly as the standard to be cheaper. 802.11b transmits at 2.4 GHz frequency band of radio spectrum. This can handle up to 11 megabits of data per second, and using the free code keying (CCK) coding.
o standard 802.11g also transmits at 2.4 GHz, but a lot faster than 802.11b - it can handle up to 54 megabits of data per second. 802.11g is faster because it uses orthogonal frequency-division multiplexing (OFDM), a more efficient coding techniques.
o 802.11a transmits at 5GHz and can move up to 54 megabits of data per second. And he also uses OFDM coding. New standards, like 802.11n, can be even faster than 802.11g. However, the 802.11n standard is not yet final.
* WiFi radio can send on one of the three frequency bands. Or, they can "frequency hop" rapidly between the various bands. Frequency hopping helps reduce interference and lets multiple devices use the same wireless connection simultaneously.


Each product tested and approved as "Wi-Fi Certified" (a trademark) by the Wi-Fi Alliance certification is the same as one another, even if they originate from different producers. A user with the "Wi-Fi Certified" product can use the access point with other brands client hardware that also is certified. Usually, however, any Wi-Fi product using the same radio frequency (for example, 2.4GHz for 802.11b or 11g, 5GHz for 802.11a) will work together with others, even if not "Wi-Fi Certified."

As long as they all have wireless adapters, several devices that can use a router to connect to the Internet. This connection is simple and almost invisible, and it is quite reliable. If the router fails or if too many people trying to use a high-bandwidth applications at the same time, however, users can experience interference or lose their connection.


f you want to launch wireless network in your home, office, or public area, the first thing you want to do is make sure that your computer has the right wireless devices. Most new laptops and many new desktop computers come with built-in wireless transmitters. Laptop if you do not, you can buy a wireless adapter that plugs into the PC card slot or USB port. Desktop computers can use USB adapters, or you can buy an adapter that plugs in to the PCI slot in the computer case. Many of these adapters can use more than one 802.11 standard.



After you install your wireless adapter and drivers that allow it to operate, your computer must be able to know automatically to the network that already exists. This means that when you change your computer in a WiFi hotspot, the computer will inform you that there is a network and ask if you want to connect to. If you have an older computer, you may need to use a software program to detect and connect to the wireless network.

Connected to the internet via wifi is very convenient for us. home wireless network so that is also comfortable. They help us to easily connect multiple computers and to move them from place to place without disconnecting and reconnecting wires, and we can play in many positions such as our computer is.