Sol07 - CHAPTER 7 Transmission Media Solutions to Review...

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1 CHAPTER 7 Transmission Media Solutions to Review Questions and Exercises Review Questions 1. The transmission media is located beneath the physical layer and controlled by the physical layer. 2. The two major categories are guided and unguided media. 3. Guided media have physical boundaries, while unguided media are unbounded. 4. The three major categories of guided media are twisted-pair , coaxial , and fiber- optic cables. 5. Twisting ensures that both wires are equally, but inversely , affected by external influences such as noise. 6. Refraction and reflection are two phenomena that occur when a beam of light travels into a less dense medium. When the angle of incidence is less than the crit- ical angle, refraction occurs. The beam crosses the interface into the less dense medium. When the angle of incidence is greater than the critical angle, reflection occurs. The beam changes direction at the interface and goes back into the more dense medium. 7. The inner core of an optical fiber is surrounded by cladding . The core is denser than the cladding, so a light beam traveling through the core is reflected at the boundary between the core and the cladding if the incident angle is more than the critical angle.
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Sol07 - CHAPTER 7 Transmission Media Solutions to Review...

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