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(Frequency Division Multiplexing), WDM ( Wavelength division Multiplexing), DWDM (Dense WavelengthDivision Multiplexing) and CWDM ( Coarse wavelength division multiplexing). I learned a lot in this chapterabout cabling.1.What are the four fundamental properties of an analog signal? The four fundamental properties of an analog signal are amplitude, frequency, wavelength and phase.2.What does a modem do? A modem connects to your Internet service provider that usually provides either DSLor cable internet service.3.What is twist ratio and why is it important? Twist ratio is the number of twist per meter and is important because the more twists per ratio there is the more resistant it is to cross talk.4.What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable from stretching?