One example is a radio communication system. The medium through which information is transmitted electromagnetic waves, and more specifically those with frequencies that are lower than the frequency of visible light. On one end of these radio systems is a transmitter that will take the information and electronically convert it into radio waves. These radio waves travel to the other end of the radio communication system, which is designed to detect and decode the waves and convert them to recognizable information. A simple two-way radio system may comprise of two hand held transceivers, for example, which are more commonly referred to as walking-talkies.
Power line communication systems are used to transmit electronically from a source or array of sources to their destinations. A type of electronic system that often is referred to is cable television, widely known for its transmission of a plethora of channels throughout homes in addition to their use for providing Internet access. Power line communication systems are often used because of their relatively low cost, even though there are other systems that surpass them in quality and efficiency.
Optical communication systems offer many improvements over other types, and have also been responsible for revolutionizing the telecommunications industry. The main reason for this is because the medium used in optical systems is light, which allows for them to be faster, clearer, and more reliable than electrical or radio signals. These reliable signals are usually carried through optical fiber, although an optical signal can be sent over relatively short distances through the air, usually only over a couple of miles.
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