NTC/362 Week 2
Analog Signals, A/D-D/A in Telecommunications, and the Digital Hierarchy
1 Write a 200- to 300-word response to the following:
Supporting Activities: Introduction to Modems
•what are the various modulation techniques? Begin your explanation with frequency-shift keying and move to multilevel QAM
2 Write a 200- to 300-word response to the following
Supporting Activity: Fundamentals of Digital Signals
•What is the nature of digital signals, binary, and other multilevel signal types?
•What are the advantages of digital signals over analog signals? Cover noise suppression in your explanation
3 Write a 200- to 300-word response to the following:
Supporting Activity: Digitization of Analog Signals
•Provide a specific example of digitizing analog signals in the telephone system. Explain band limiting and quantization noise. Explain the µ law and the A law conversion in the coder-decoder.
4 Writea 200- to 300-word response to the following:
Supporting Activity: Digital Systems and the Digital Hierarchy
•Explain digital multiplexing, the digital T(X), and SONET hierarchy. Explain the differences between the American and European systems.
•Explain digital services such as Integrated Services Digital Network, Switched Multimegabit Data System, and Switch 56.
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