Basic Digital Communications: Advantages and Disadvantages
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Questions and Answers

What is one advantage of digital communication?

  • Low bandwidth requirement (correct)
  • Complicated circuitry
  • Unsuitable for encryption
  • High power consumption

    • According to Hartley’s Law, what is the information capacity proportional to?

  • Frequency range and time of transmission (correct)
  • Time of transmission only
  • Signal strength
  • Frequency range only

    • What is a disadvantage of digital communications?

  • Low bandwidth requirement
  • Low power consumption
  • No need for synchronization
  • High power consumption due to multiple stages (correct)

    • What does Shannon's limit formula calculate?

    <p>Information capacity</p> Signup and view all the answers

    What is one advantage of digital communication according to the given text?

    <p>Flexibility in hardware implementation</p> Signup and view all the answers

    According to Hartley’s Law, what is the information capacity proportional to?

    <p>Frequency range and time of transmission</p> Signup and view all the answers

    What is the maximum data rate for a satellite TV channel with a signal to noise ratio of 20dB and a video bandwidth of 10MHz?

    <p>40 Mbps</p> Signup and view all the answers

    Is it possible to approach error-free transmission with a 100-kbps data stream on a voice grade telephone circuit with a bandwidth of 3kHz and a SNR of 10 dB?

    <p>No, it is not possible</p> Signup and view all the answers

    For a telephone line with a signal to noise ratio of 30 dB, what is the required bandwidth to achieve the maximum data rate of 3 Mbps?

    <p>10 kHz</p> Signup and view all the answers

    A telephone line has a bandwidth of 3.2 kHz and a signal to noise ratio of 35 dB. A signal is transmitted using a four-level code. What is the maximum theoretical data rate?

    <p>32 kbps</p> Signup and view all the answers

    A broadcast television channel has a bandwidth of 6 MHz. What is the maximum data rate that could be carried in this TV channel using a 16-level code?

    <p>96 Mbps</p> Signup and view all the answers

    What is the power in dBm for power consumption of 100mW?

    <p>+20 dBm</p> Signup and view all the answers

    What is the power in milliwatts for power consumption of 20 dBm?

    <p>100 mW</p> Signup and view all the answers

    What is the power in Watts for power consumption of 40 dBm?

    <p>.1 W</p> Signup and view all the answers

    "What is the power in dBm for power consumption of 100W?"

    <p>&quot;+80 dBm&quot;</p> Signup and view all the answers

    "What is power in Watts for power consumption of 40dBm?"

    <p>&quot;0.1 W&quot;</p> Signup and view all the answers

    "What is the power in milliwatts for power consumption of 20dBm?"

    <p>&quot;100 mW&quot;</p> Signup and view all the answers

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