Transport Layer Responsibilities
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Questions and Answers

What is the primary reason why a signal loses energy as it travels through a medium?

  • The signal overcomes the resistance of the medium. (correct)
  • The signal is amplified by the medium.
  • The signal is converted to heat.
  • The signal is distorted by the medium.

    • What is the unit of measurement used to show the relative strengths of two signals or one signal at two different points?

  • Decibel (correct)
  • Volt
  • Ampere
  • Watt

    • What is the result of a signal being attenuated?

  • The signal loses energy. (correct)
  • The signal is amplified.
  • The signal remains unchanged.
  • The signal is distorted.

    • What is the purpose of amplifiers in signal transmission?

    <p>To compensate for the loss of energy.</p> Signup and view all the answers

    What is the formula to calculate the decibel (dB) of a signal?

    <p>dB = 10 Log10 (P2 / P1)</p> Signup and view all the answers

    What is the meaning of a negative decibel (dB) value?

    <p>The signal is attenuated.</p> Signup and view all the answers

    What is the result of a 3 dB loss of power in a signal?

    <p>The signal loses one-half of its power.</p> Signup and view all the answers

    What is the unit of measurement used to define the loss in a cable?

    <p>Decibel per kilometer (dB/km)</p> Signup and view all the answers

    What is the power of the signal at 5 km if the signal at the beginning of a cable has a power of 2 mW and the loss in the cable is -0.3 dB/km?

    <p>1.87 mW</p> Signup and view all the answers

    What are the three causes of impairment in signal transmission?

    <p>Attenuation, distortion, and noise.</p> Signup and view all the answers

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