quiz2 - 8. What is the difference between NRZI and NRZL? 9....

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1. FM radio is based on duplex transmission. A. True B. False 2. How is multi-mode fiber different from single-mode fiber? 3. When performing lossless sampling of an analog signal, lowest sampling rate is 2B, what does the B stand for? A. Frequency band of the signal B. Highest frequency of the signal C. Frequency band of the channel D. Highest frequency of the channel 4. In Shannon formula C = B log2(1 + S/N), what does the B stand for? A. Highest frequency of the signal B. Frequency band of the signal C. Highest frequency of the channel D. Frequency band of the channel 5. In Shannon formula C = B log2(1 + S/N), we should use dB unit for S/N, not the raw ratio. A. True B. False 6. It is possible to transport CD-quality music through telephone lines. A. True B. False 7. For a dial-up modem, what does it process? A. Digital data, analog signal B. Digital data, digital signal C. Analog data, analog signal D. Analog data, digital signal
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Unformatted text preview: 8. What is the difference between NRZI and NRZL? 9. Compare HDB3 with AMI, NRZL and NRZI, what is the major advantage? 10. Analog signal cannot be used to carry digital data. A. True B. False 11. Analog voice is converted to bit streams using 8 kHz sampling rate and 256-level quantization. What is the bit rate of the digital stream? A. 64kb/s B. 128kb/s C. 8kb/s D. 2048kb/s 12. In PCM, suppose the analog data's highest frequency is F, which of the following helps improving the quality of the digital signal? A. Using more levels in quantization B. Using sampling rate higher than F C. Increasing sampling rate from 2F to 3F D. Only 1 and 2 13. Nyquist channel capacity tells us that C = 2B log2 (M). Therefore, we can increase the capacity of the channel to whatever we want by increasing the quantization levels M. A. True B. False...
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quiz2 - 8. What is the difference between NRZI and NRZL? 9....

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