DATA COMMUNICATIONS AND NETWORKING SUBJECT

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Signal Q3-1. What is the relationship between period and frequency? Q3-2. What does the amplitude of a signal measure? What does the frequency of a signal measure? What does the phase of a signal measure? Q3-3. How can a composite signal be decomposed into its individual frequencies? Q3-4. Name three types of transmission impairment. Q3-6. Distinguish between a low-pass channel and a band-pass channel. P3-1. Given the frequencies listed below, calculate the corresponding periods. a. 24 Hz b. 8 MHz c. 140 KHz P3-2. Given the following periods, calculate the corresponding frequencies. a. 5 s c. 220 ns b. 12 us P3-3. P3-4. What is the phase shift for the following? a. A sine wave with the maximum amplitude at time zero b. A sine wave with maximum amplitude after 1/4 cycle c. A sine wave with zero amplitude after 3/4 cycle and increasing What is the bandwidth of a signal that can be decomposed into five sine waves with frequencies at 0, 20, 50, 100, and 200 Hz? All peak amplitudes are the same. Draw the bandwidth. A periodic composite signal with a bandwidth of 2000 Hz is composed of two sine waves. The first one has a frequency of 100 Hz with a maximum ampli- tude of 20 V; the second one has a maximum amplitude of 5 V. Draw the bandwidth. P3-5. P3-6. P3-7. Which signal has a wider bandwidth, a sine wave with a frequency of 100 Hz or a sine wave with a frequency of 200 Hz? What is the bit rate for each of the following signals? a. A signal in which 1 bit lasts 0.001 s b. A signal in which 1 bit lasts 2 ms c. A signal in which 10 bits last 20 us A device is sending out data at the rate of 1000 bps. a. How long does it take to send out 10 bits? b. How long does it take to send out a single character (8 bits)? c. How long does it take to send a file of 100,000 characters? P3-8. P3-9. What is the bit rate for the signal in Figure 3.35? Figure 3.35 Problem P3-9 16 ns Time P3-10. What is the frequency of the signal in Figure 3.36? Figure 3.36 Problem P3-10 4 ms HAAAAAAA Att Time P3-11. What is the bandwidth of the composite signal shown in Figure 3.37? Figure 3.37 Problem P3-11 180 Frequency sisisisis A periodic composite signal contains frequencies from 10 to 30 KHz, each with an amplitude of 10 V. Draw the frequency spectrum