Information Signals

Data is a type of information that the network stores in a computer or retrieves from it. As a result, wireless networks transfer data from one computer to another. This data can include e-mail messages, files, web pages, video, music, and voice conversations.

Communications systems—such as a wireless network— symbolize data using codes that electrical, radio, and light signals efficiently represent. The signals carry the information through the system from one point to another. The signals are either digital or analog, depending on their location within the system.

Digital Signals

Digital signals, which are found inside computers, vary in amplitude steps as time advances. (See Figure 2-7.) Digital signals are usually binary ...

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