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Explain the different multiplexing techniques. What is FDM? Give examples of practical systems in which FDM is used. What is the difference between synchronous TDM

Explain the different multiplexing techniques. What is FDM? Give examples of practical systems in which FDM is used.

What is the difference between synchronous TDM and statistical TDM? Explain the digital hierarchy of E-carriers. Explain the importance of WDM and DWDM in enhancing the capacity of optical fibers.

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