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Figure 1-8 Frequency division multiplexing (FDM).
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frequency some of the time, because they are the only ones using the channel during their timeslot. In frequency division multiplexing, users are given some of the frequency all of the time because they are the only ones using their particular frequency band at any point.
Analog versus Digital Signaling: Dispensing with Myths
Frequency division multiplexing is normally considered to be an analog technology, while time division multiplexing is a digital technology. The word analog means something that bears a similarity to something else, while the word digital means discrete. Analog data, for example, typically illustrated as some form of sine wave such as that shown in Figure 1-9, is an exact representation of the values of the data being transmitted. The process of using manipulated characteristics of a signal to represent data is called signaling. We should also introduce a few terms here just to keep things marginally confusing. When speaking of signaling, the proper term for digital is baseband, while the term for analog signaling is broadband. When talking about data (not signaling), the term broadband means big channel. The sine wave, undulating along in real time in response to changes in one or more parameters that control its shape, represents the exact value of each of those parameters at any point in time. The parameters are
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First Things First
First Things First
Figure 1-9 Sine wave.
amplitude, frequency, and phase. We will discuss each in turn. Before we do, though, let s relate analog waves to the geometry of a circle. Trust me this helps. Consider the diagram shown in Figure 1-10. As the circle rolls along the flat surface, the dot will trace the shape shown by the line. This shape is called a sine wave. If we examine this waveform carefully, we notice some interesting things about it. First of all, every time the circle completes a full revolution (360 degrees), it draws the shape shown in Figure 1-11. Thus halfway through its path, indicated by the zero point on the graph, the circle has passed through 180 degrees of travel. This makes sense, because a circle circumscribes 360 degrees. The reason this is important is because we can manipulate the characteristics of the wave created in this fashion to cause it to carry varying amounts of information. Those characteristics, amplitude, frequency, and phase, can be manipulated as follows.
Amplitude Modulation
Amplitude is a measure of the loudness of a signal. A loud signal, such as that currently thumping through the ceiling of my office from my 16 year-old son s upstairs bedroom, has high-amplitude components, while lower volume signals are lower in amplitude. Examples are shown in Figure 1-12. The dashed line represents a high-amplitude signal, while the solid line represents a lower-amplitude signal. How could this be used in the data communications realm Simple: Let s let high amplitude represent a digital zero, and low amplitude represent a digital one. If I then send four high amplitude waves followed by four lowamplitude waves, I have actually transmitted the series 00001111. This technique is called amplitude modulation (AM); modulation simply means vary.
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First Things First
Figure 1-10 Creating a sine wave.
1
Figure 1-11 Sine wave.
180
270
360
Figure 1-12 Amplitude modulation.
Frequency Modulation
Frequency modulation (FM) is similar to amplitude modulation, except that instead of changing the loudness of the signal, we change the number of signals that pass a point in a given second, illustrated in Fig-
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