title: Calculating Utilization in a Stop-And-Wait Protocol
body: <p>I have a problem in my book about calculating the <em>utilisation</em>, but I'm not being able to find any substantial information regarding this topic in order to solve it.</p>
  
  <p>Anyway, here's the question:</p>
  
  <blockquote>
    <p>The distance from earth to a distant planet is approximately 9 × 10^10
    m. What is the channel utilization if a stop-and-wait protocol is used
    for frame transmission on a 64 Mbps point-to-point link? Assume that
    the frame size is 32 KB and the speed of light is 3 × 10^8 m/s.</p>
    
    <p>Suppose a sliding window protocol is used instead. For what send
    window size will the link utilization be 100%? You may ignore the
    protocol processing times at the sender and the receiver.</p>
  </blockquote>