ch06_updated_hw

ch06_updated_hw - Homework Updated January 2007 CHAPTER 6...

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Homework Updated January 2007 CHAPTER 6 Telecommunications L e a r n i n g   O b je c ti v e s : Last Name: ____________________________________________________ First Name: ____________________________________________________ Due Date: __________________________________ Test Your Understanding 1. a) What is the name of the worldwide telecommunications network? b) Does the PSTN only handle telephone traffic? Explain. c) Why are we looking at the PSTN in this chapter? 2. What are the four technical elements in the PSTN? 3. a) What is customer premises equipment? b) What is the purpose of the PBX? c) What type of wiring does business telephony use? d) What is the most expensive part of customer premises equipment to purchase and install? 4. a) What is the local loop? b) What is the function of the transport core? c) What are the two elements of the transport core? d) Which is changing more rapidly—the access system or the transport core? e) Explain why. 5. a) What is signaling? Chapter 6-1
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b) In telephony, distinguish between transport and signaling. 6. a) What are the three tiers of carriers in the PSTN? b) What are connection points between carriers called in the PSTN? 7. a) What is circuit switching? b) Why does circuit switching make sense for voice communication? c) What does it mean that data transmission is bursty? d) Why is burstiness bad for circuit switching? 8. a) What are the differences between dial-up and leased line circuits? b) What is multiplexing in the context of telephone calls and leased lines? 9. a) Distinguish between the 4-pair UTP wiring used in Ethernet and the UTP wiring in the residential local loop. b) Distinguish between the UTP wiring in the residential local loop and the UTP wiring used for lower-speed leased lines. c) What technology do the highest-speed leased lines use?
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ch06_updated_hw - Homework Updated January 2007 CHAPTER 6...

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