What are the four fundamental properties of an analog signal Amplitude

What are the four fundamental properties of an analog

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1.What are the four fundamental properties of an analog signal?2.What does a modem do?3.What is twist ratio and why is it important?
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4.What fiber is used in fiber-optic cabling to protect the inner core and preventthe cable from stretching?5.What characteristic of optical transmissions is primarily responsible for the distance limitations of fiber-optic cabling?6.Why is SMF more efficient over long distances than MMF?7.Why do APC ferrules create less back reflection than do UPC ferrules?8.What does a fiber cleaver do?9.How is latency measured and in what unit?10.What is the difference between short circuits and open circuits?
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