SolStd04 - CHAPTER 4 Digital Transmission Solutions to...

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1 CHAPTER 4 Digital Transmission Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. The three different techniques described in this chapter are line coding , block cod- ing , and scrambling . 3. The data rate defines the number of data elements (bits) sent in 1s. The unit is bits per second (bps). The signal rate is the number of signal elements sent in 1s. The unit is the baud. 5. When the voltage level in a digital signal is constant for a while, the spectrum cre- ates very low frequencies, called DC components , that present problems for a sys- tem that cannot pass low frequencies. 7. In this chapter, we introduced unipolar , polar , bipolar , multilevel , and multitran- sition coding. 9. Scrambling, as discussed in this chapter, is a technique that substitutes long zero- level pulses with a combination of other levels without increasing the number of bits. 11. In parallel transmission we send data several bits at a time. In serial transmission we send data one bit at a time.
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This note was uploaded on 09/16/2010 for the course SETAS ETEC301 taught by Professor Multiple during the Winter '09 term at Centennial College.

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SolStd04 - CHAPTER 4 Digital Transmission Solutions to...

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