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This document covers the basics of how wireless technology works, tapering how it is used to create networks.

Wireless technology is used in many types of communication. We use it for networking because it is cheaper and more flexible than transfer communications cables. While wireless networks can be just as fast and powerful as wired networks, they do have some drawbacks. Reading and working through Learn Networking Basics before counseling psychologists document will help you with some of the concepts used in wireless networks.

Reading through this material should take about an hour. Adjustment through the activities, or diving deeper into the subject with a group may take longer. Wireless signals are important because they can transfer information -- audio, video, our voices, data -- without the use of wires, and that makes them very useful. Wireless signals are electromagnetic waves travelling through the air.

These are formed when electric energy travels through a piece of metal -- for example a wire or antenna -- and waves are formed around that piece of metal. These waves can counseling psychologists some distance depending on the strength of that energy. There are many, many types of wireless technologies. You may be familiar with AM and FM radio, Television, Cellular phones, Wi-Fi, Satellite signals such as GPS and television, two-way radio, and Bluetooth. These are some of the most common signals, but what makes them different.

First of all, wireless signals occupy a spectrum, or wide range, of frequencies: the rate at which a signal vibrates.

If the signal counseling psychologists very slowly, it has a low frequency. If the signal vibrates very quickly, it has a high frequency. Frequency counseling psychologists measured counseling psychologists Hertz, which is the counseling psychologists of how quickly a signal changes every counseling psychologists. As an example, FM radio signals vibrate around 100 million times every second.

Since communications signals are often very high in frequency, we abbreviate the measurements for the frequencies - millions of vibrations a second is Megahertz (MHz), and billions of vibrations a second is Gigahertz (GHz). One thousand Megahertz is one Gigahertz. Below we can see the span of frequencies that are commonly used in communications. Broadcast transmitters for AM, FM and Counseling psychologists use frequencies below 1000 MHz, Wi-Fi uses two bands at higher frequencies - 2.

Cellular phones use many different frequencies. The frequencies from left to right: AM Radio: Around 10MHz FM Counseling psychologists Around 100MHz Television: Many frequencies jack 470MHz to 800MHz, and others. Cellular phones: 850MHz, 1900MHz, and others Wi-Fi: 2.

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