SolStd06 - CHAPTER 6 Bandwidth Utilization: Solutions to...

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1 CHAPTER 6 Bandwidth Utilization: Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link. 3. In multiplexing , the word link refers to the physical path. The word channel refers to the portion of a link that carries a transmission between a given pair of lines. One link can have many (n) channels. 5. To maximize the efficiency of their infrastructure, telephone companies have tradi- tionally multiplexed analog signals from lower-bandwidth lines onto higher-band- width lines. The analog hierarchy uses voice channels (4 KHz), groups (48 KHz), supergroups (240 KHz), master groups (2.4 MHz), and jumbo groups (15.12 MHz). 7. WDM is common for multiplexing optical signals because it allows the multiplex- ing of signals with a very high frequency. 9. In synchronous TDM , each input has a reserved slot in the output frame. This can be inefficient if some input lines have no data to send. In
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SolStd06 - CHAPTER 6 Bandwidth Utilization: Solutions to...

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