September 7, 2011
Chapter 3 Summary Questions
1. How does a multipoint circuit differ from a point-to-point circuit? A multipoint circuit differs from a point-to-point circuit in that it is many computers connected on the same circuit while the point-to-point goes from one computer to another. P2P can also be more expensive if the computers connected are far apart.
3. Describe three types of guided media. Three types of guided media are fiber-optic cable which uses high-speed streams of light pulses from lasers or LEDS, coaxial cable copper-core with a cylindrical shell for insulation, and twisted-pair wire insulated pairs of wires that can be packed closely together.
6. Clearly explain the differences among analog data, analog transmission, digital data, and digital transmission. Digital transmission is “better” than analog, in which case analog is sometimes converted into digital transmission. Digital transmission is a transfer of data over a point to point or multipoint transmission medium –such as copper wiring, fiber-optics, wireless, or storage media. Analog transmission is a method of conveying voice, data, image, signal, or video information; it uses a continuous signal varying in amplitude, frequency, or phase. Analog data is a series of electrical pulses or radio waves. Digital transmission is done by sending a series of electrical (or light) pulses through the media. Digital transmission is preferred to analog transmission because it produces fewer errors; is more efficient; permits higher maximum transmission rates; is more secure; and simplifies the integration of voice, video, and data on the same circuit.
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