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What is the relationship between a signals spectrum and its bandwidth? What is attenuation? Compare and contrast DTE with DeE. What are the components of

What is the relationship between a signals spectrum and its bandwidth? What is attenuation?
Compare and contrast DTE with DeE. What are the components of the DTE and DCE?
What are the different categories of modulation to change digital signals to analog signals?
Define channel capacity and what key factors affect channel capacity.
What distinguishes Frequency Division Multiplexing (FDM)? Time Division Multiplexing (TDM)? Statistical Time Division Multiplexing (STDM)? Wavelength Division Multiplexing (WDM)?
Why is multiplexing so cost-effective?

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