Page 12 - M. Abrahim Thesis
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Figure 1-2shown a wide-area networks Hierarchy
Every Networking Concept Explained In 8 Minutes
https://www.youtube.com/watch?v=tSodBEAJz9Y&t=8s
1.1.1 The Electromagnetic Wave
The light used in optical fiber networks is one type of electromagnetic energy. When an
electric charge moves back and forth or accelerates, a type of energy called electromagnetic
energy is produced. This energy, in the form of waves, can travel through a vacuum, the air, and
through some materials like glass. An important property of any energy wave is its wavelength,
as shown in Figure 1-3.
Figure 1-3 shown an electromagnetic energy of wave and its wavelength
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