i$)$ Suppose there is a $10$ Mbps microwave link between a geostationary satellite and its base station on Earth. The distance of the satellite from Earth is $36,000$ Km$.$ Every minute the satellite takes a digital photo and sends it to the base station. Assume a propagation speed of $2\mathrm{.}4$ x $108$ meters$/$sec$.$

$($a$)$ What is the propagation delay of the link?

$($b$)$ What is the bandwidth$-$delay product?

$($c$)$ Provide an interpretation of the bandwidth$-$delay product.

$($d$)$ Let x denote the size of the photo. What is the minimum value of x for the microwave link to be continuously transmitting?

$($ii$)$ What advantage does a circuit$-$switched network have over a packet$-$switched net$-$ work? What advantages does TDM have over FDM in a circuit$-$switched$$network$?$