Data transmission, as the name suggests, is a means of moving data from one location to another. Choosing the best transmission standard to accomplish this requires evaluation of many system parameters. The first two considerations encountered are How fast? and How far? How fast? refers to the signaling rate or number of bits transmitted per second. How far? is concerned with the physical distance between the transmitter and receiver of the data. Consideration of these two primary system parameters usually results in a significant narrowing of the possible solutions. Figure 1–1 shows the speed and distance coverage of some familiar data transmission choices.

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