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_____ is the multiplexing technique that shifts each signal to a different carrier frequency.(a) FDM(b) TDM(c) Both FDM & TDM(d) PDMI have been asked this question in an interview for internship.My doubt is from Topology in section Security & Physical Layer of Computer Network

Answer» CORRECT option is (a) FDM

The explanation: FDM is an ABBREVIATION for Frequency Division MULTIPLEXING. This technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the SIGNALS which are to be transmitted. The channel is active at all times unless a COLLISION occurs with another channel trying to use the same frequency. Some other multiplexing techniques are Time division multiplexing and Phase division multiplexing.


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