Avalon (7th Sea Nationbook) by Rob Vaux, John Wick, Jennifer Wick, Kevin Wilson, Jim Pinto,

By Rob Vaux, John Wick, Jennifer Wick, Kevin Wilson, Jim Pinto, Ray Yand, Scott Gearin

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It is important to keep the difference between data and signaling clearly separate. Data is the information that is being transported, and it can be either analog or digital in nature. For example, music is a purely analog signal because its values constantly vary over time. It can be represented, however, through both analog and digital signaling techniques. The zeroes and ones that spew forth from a computer are clearly digital information, but they, too, can be represented either analogically or digitally.

In 1948, Shannon published A Mathematical Theory of Communication, which is now universally accepted as the framework for modern communications. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. First Things First 32 Chapter 1 Figure 1-26 Oscilloscope trace his conclusions are seminal: The higher the noise level in a circuit, the lower the achievable bandwidth. The bottom line? Noise matters. It matters so much, in fact, that network designers and engineers make its elimination the first order of business in their overall strategies for creating high-bandwidth networks.

We know from our earlier discussion that we can represent two bits by sending a high-amplitude signal followed by a low-amplitude signal (high-amplitude signal represents a zero, low-amplitude signal represents a one). What would happen though, if we were to combine amplitude modulation with frequency modulation? Consider the four waveforms shown in Figure 1-22. By combining the two possible values of each characteristic (high or low, frequency or amplitude), we create four possible states, each of which can actually represent two bits as shown in Figure 1-23.

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