How the Wifi in My Opinion

How can I make a computer so can relate to another computer?? By not using a wired or direct physical contact. The answer is a Wireless Network (Wireless Network).Here is an explanation on how the Wireless NetworkIn the beginning was explained that in order to connect a computer to one another, it is necessary to Wireless Networks. According to a book is concerned, so that the computers that are in the area of ​​wireless networks can be successful in sending and receiving data to and from each other, then there are three necessary components, namely:


    1. Signal Radio (Radio Signal).
    2. Data Format (Data Format).
    3. Structure Network or Network (Network Structure).Each one of these components operate independently in the workings and functions. We know the OSI 7 Layer Model (Open Systems Connection), namely:
1. Physical Layer
2. Data-Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application LayerEach of the three components mentioned above are in different layers. They work and control the different layers. For example:Radio signal (the first component), working on the physical layer, or physical layer. Then Format Data Format Data or control multiple layers on top. And network structure serves as a tool to send and receive radio signals.More specifically, how can diumpakan wireless LAN as the workings of a modem to send and receive data to and from the internet. We will send the data, wireless equipment was going to serve as a tool that converts digital data into radio signals. Then when you receive, equipment serves as a tool which converts radio signals into digital data that can be understood and processed by computers.
How radio signals can be converted into digital data?The basic principle used in wireless technology is actually taken out of the equation made by James Clerk Maxwell in 1964.In the equation, Maxwell vividly and clearly managed to point out the fact that, any changes in the magnetic field will create electric fields. And conversely, any changes in the electric fields will menciptaken magnetic fields.Maxwell further explained, when an electrical current (AC or alternating current) moves through a cable or physical medium (conductor) others, then, some part of the energy will be released into the free space around it, and then forms a magnetic field or an alternating magnetic field.Then, the magnetic field created by the energy is released it will create an electric field in free space, which then would create a magnetic field again, and then again the electric field, magnetic field again, and so on, until the original electric current or the first stop (interrupted , red).Form of energy that is created from these changes, referred to as electromagnetic radiation (electromagnetic radiation), or commonly known as radio waves. That means, the radio can be defined as the radiation of electromagnetic energy is released into the air (free space).Tool that generates radio waves that commonly called TRANSMITTER. Then the tool used to detect and capture radio waves that no air was, commonly called RECEIVER.That both these devices (transmitter and receiver) is more focused when you send, making a wave pattern, directing, improve, and radio signal, to and from the air, then dibantulah with other tools, namely ANTENNA.Thanks to the equations of Maxwell, transmitter, receiver, and antenna, which is then incorporated into all wireless LAN equipment that, then the computers can communicate, send and receive data via radio waves, or commonly referred to as wireless netwok.So many radio stations with different frequency so as not to collide with each other, the radio waves are sent into the air that could be arranged frequencynya. That is the way to set or modify the electric currents that are the sender and receiver equipment earlier (transmitter, receiver).And the distance of separation between frequency be called SPECTRUM. Then, the smallest part of the spectrum called BAND. And to measure the number of loops from one wave to wave that occurs in a matter of seconds, the unit is used HERTZ (Hz).Hertz, taken from the name of the person who first attempted to send and pick up radio waves, which HEINRICH HERTZ. One hertz is calculated as the distance between one wave to the next wave. And radio signals are generally located on the frequency of thousands, millions, or billions of hertz (kHz, MHz, GHz). By adjusting the frequency that the radio signals can not collide.

Source : Book Perkembangan IT  di Indonesia
and My Deskription