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Previous Year Question (PYQs)

You are designing a link layer protocol for a link with a bandwidth of $1$ Gbps over a fiber link with a length of $800$ km. Assume the speed of light in this medium is $200000$ km/second. What is the propagation delay in this link?




Solution

Propagation delay is given by

$\text{Propagation delay}=\dfrac{\text{Distance}}{\text{Propagation speed}}$

Here,

Distance $=800$ km

Speed $=200000$ km/second

So,

$\text{Propagation delay}=\dfrac{800}{200000}$

$=0.004$ seconds

$=4$ milliseconds


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