Question: Why are A / D and D / A converters needed in a time division switch?What are the functions of multiplexing / demultiplexing in a

Why are A/D and D/A converters needed in a time division switch?What are the functions of multiplexing/demultiplexing in a time division switch?
What is the function of time slot interchanger in a time division switch? What happens if the time slots are not interchanged (while other components are kept)?
How does a time division switch achieve circuit switching?

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