The serialization delay is the amount of time it takes to forward bits out of an interface. A 1 gigabit per second interface can send 1 billion bits per second. One billion bits per second equates to roughly 125 megabytes per second.
Therefore, a 24 megabyte buffer can hold 0.19 seconds of gigabit traffic. For fun, the same buffer would hold only –.019 seconds of traffic at 10 megabits.
Can you explain how the author derived at his conclusion:
24 megabyte buffer can hold 0.19 seconds of gigabit traffic