Last Name: First Name:

1. What is the frequency in Hertz of a signal that repeats 80,000 times within one minute? What is its period?

2. Draw in chart form (as shown in Figure) the voltage representation of the bit pattern 11010010 for the digital encoding schemes NRZ-L, NRZ-I, Manchester, differential Manchester, and bipolar-AMI.

You may use a spread to do this:

3. A signal starts at point X. As it travels to point Y, it loses 8 dB. At point Y, the signal is boosted by 10 dB. As the signal travels to point Z, it loses 7 dB. What is the dB strength of the signal at point Z?

X → Y → Z

4. Using EBCDIC, ASCII, and Unicode character code sets, what are the binary encodings of the message "Hello World"?

5. Using Shannon's formula, calculate the data transfer rate given the following information:

signal frequency = 10,000 Hz
signal power = 5000 watts
noise power =230 watts.

6. What is the bandwidth of a signal?

7. What is the definition of baud rate?

8. What is meant by the sampling rate of analog data?

9. What are the differences between EBCDIC, ASCII and Unicode?

10. What is the decibel loss of a signal that starts at point A with a strength of 2000 watts and ends at point B with a strength of 400 watts?