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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Why are ASCII and EBCDIC important Are there other character codes that are still in use What are they Convert the number 2,38710 to its base two equivalent. Convert 11010011010102 to its base ten equivalent. Give three examples of noise in a telephone network. Explain the difference between noise and distortion. The OSI Model is referred to as a layered protocol model. Why are layered models advantageous Explain the difference between layers six and seven. Are they both necessary Why What is the difference between connectivity and interoperability Is one more important than the other Why or why not What layer of OSI cares most about each of the following: bits, messages, cells, frames, and packets Explain the difference between a connection-oriented and a connectionless network, including appropriate applications for each. What is the simplest form of error correction
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3
In this chapter we will explore telephony and the telephone network. Described as the largest machine ever built, the telephone network is an impressive thing. We begin with some history, then explore the network itself, and finally explore telephony service how it works, how it makes its way across the network, and how it is managed. We will examine the process of voice digitization followed by the multiplexing and high-speed transport of voice through such technologies as PCM, SONET, and SDH. Some people feel that voice is something of an anachronism and has no place in a book about the new, slick world of telecommunications. I disagree: Without an understanding of how the voice network operates, it is impossible to understand or appreciate how data networks operate. Furthermore, as voice moves inexorably toward an all-IP model, the voice stream becomes nothing more than one more component of the overall corporate data stream. Additionally, since the IT organization manages data in most corporations, voice is rapidly becoming just another corporate data application. This chapter is designed to bridge the gap between the two, and we begin our tale in New York City.
Miracle on Second Avenue
February 26, 1975 was a business-as-usual day at New York Telephone s lower Manhattan switching center. Located at 2nd Avenue and 13th Street, the massive 11-story building was the telephony nerve center for 12 Manhattan exchanges that provided service to 300 New York City blocks, including 104,000 subscribers and 170,000 telephones. Within the service area were six hospitals, 11 firehouses, three post offices, one police station, nine schools, and three universities. The building was massive, but like most central offices was completely invisible to the public. It was just a big, windowless structure that belonged to the telephone company. No one really knew what went on in there; nobody cared. When night fell, most of the building s employees went home, leaving a small crew to handle maintenance tasks and minor service problems. The night was quiet; work in the building was carried out routinely. It was going to be a boring evening. At 12:30, just after midnight, a relatively inconsequential piece of power equipment in the building s subbasement cable vault shorted and spit a few errant sparks into the air around it. It caused no alarms
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