Computer Networking
The core diameter of a single-mode fibers is about

10 times the wavelength of the light carried in the fiber
None of these
10 times the fiber radius
3 times the wavelength of the light carried in the fiber
7 times the light carried in the fiber

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Computer Networking
Demodulation is the process of

combining many low speed channels into one high speed channel
converting analog signals to digital signals
converting digital signals to analog signals
None of these
dividing the high-speed signals into frequency bands

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