chap06 - Signaling and Switching Chapter 6 Objectives In...

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Signaling and Switching Chapter 6
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Objectives In this chapter, you will learn to: Define modulation and explain its four basic versions Explain the different types of multiplexing techniques, their benefits, and hardware requirements Discuss the fundamental types of switching used in voice and data communications Identify the differences between local and tandem switching Describe modern signaling techniques used to route calls to their destination
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Modulation A technique for processing signals in which two waves are combined to produce a wave that possesses characteristics of both and can be decoded to separate these characteristics. Information wave - the wave containing the signal you want to transmit. Carrier wave - the wave that is modulated, and whose properties are constant and known to both the sender and receiver. Guided waves - waves that are bound to a carrier wave’s frequency.
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Modulation Modulator - the device that imposes the information signal on the carrier signal at the transmission end. Demodulator - separates the information from the carrier signal at the receiving end. Modem - a device used to convert digital into analog signals and analog into digital signals.
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Modulation
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Amplitude Modulation
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Amplitude Modulation
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A method of modulation in which the frequency of the carrier signal is modified by the addition of the information signal. Frequency shift keying (FSK)
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chap06 - Signaling and Switching Chapter 6 Objectives In...

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