15. Draw the graph of the NRZ-L scheme using each of the following data streams, assuming that the last signal level has been positive. From the graphs, guess the bandwidth for this scheme using the average number of changes in the signal level. Compare your guess with the corresponding entry in Table 4.1. a00000000 11111111 c. 01010101 d 00110011 138 CHAPTER 4 DIGITAL TRANSMISSION 16. Repeat Exercise 15 for the NRZ-I scheme 17. Repeat Exercise 15 for the Manchester scheme, 18. Repeat Exercise 15 for the differential Manchester scheme. 19. Repeat Exercise 15 for the 201Q scheme, but use the following data streams. a. 0000000000000000 b. 11111111111111 c. 0101010101010101 d 0011001100110011 20. Repeat Exercise 15 for the MLT-3 scheme, but use the following data streams. a. 00000000 h. 11111111 c. 01010101 d. 00011000 Q3. Selected financial ratios for ABC, Incorporated, are as follows: Ratios 20x120x2 20x3 Current ratio 4.5 2.5 1.5 Acid-test ratio 2.5 1.5 0.5 Debt-to-total-assets 25% 35% 45% Inventory turnover 8.5x 5.5x 3.5x Average collection period 35 days 37 days 48 days Total asset turnover 3.5x 2.5x 1.5x Net profit margin 4% 3% 2% Return on investment 12% 7% 3% Return on equity 15% 10% 6% (a) Why did return on investment decline? (5 marks) (b) Was the increase in debt a result of greater current liabilities or of greater long-term debt? Briefly explain. (2.5 marks) 15. Draw the graph of the NRZ-L scheme using each of the following data streams, assuming that the last signal level has been positive. From the graphs, guess the bandwidth for this scheme using the average number of changes in the signal level. Compare your guess with the corresponding entry in Table 4.1. a00000000 11111111 c. 01010101 d 00110011 138 CHAPTER 4 DIGITAL TRANSMISSION 16. Repeat Exercise 15 for the NRZ-I scheme 17. Repeat Exercise 15 for the Manchester scheme, 18. Repeat Exercise 15 for the differential Manchester scheme. 19. Repeat Exercise 15 for the 201Q scheme, but use the following data streams. a. 0000000000000000 b. 11111111111111 c. 0101010101010101 d 0011001100110011 20. Repeat Exercise 15 for the MLT-3 scheme, but use the following data streams. a. 00000000 h. 11111111 c. 01010101 d. 00011000 Q3. Selected financial ratios for ABC, Incorporated, are as follows: Ratios 20x120x2 20x3 Current ratio 4.5 2.5 1.5 Acid-test ratio 2.5 1.5 0.5 Debt-to-total-assets 25% 35% 45% Inventory turnover 8.5x 5.5x 3.5x Average collection period 35 days 37 days 48 days Total asset turnover 3.5x 2.5x 1.5x Net profit margin 4% 3% 2% Return on investment 12% 7% 3% Return on equity 15% 10% 6% (a) Why did return on investment decline? (5 marks) (b) Was the increase in debt a result of greater current liabilities or of greater long-term debt? Briefly explain. (2.5 marks)