Communications

Synchronous data communication between sender and receiver occurs at regular or predetermined intervals, the timing of which is usually governed by a microprocessor clock. Asynchronous communication occurs intermittently at irregular intervals rather than in a steady stream. In the absence of clocking, a start and stop bit may be employed at the beginning and end of each piece of data (Webopedia, 2011).

Analog describes a device or system that represents changing values as continuously variable physical quantities. When used to describe data storage and transmission, analog format allows information to be transmitted by modulating a continuous transmission signal, such as amplifying a signal's strength or varying its frequency to add or take away data. In general, humans experience the world analogically. Digital describes any system based on discontinuous data or events. Computers are digital machines because at their most basic level, they can distinguish between just two values, 0...
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