Suppose a $128$ Kbps point$-$to$-$point link is set up between the earth and a rover on mars. The distance from the earth to mars $($when they are closest together$)$ is approximately $55$ Gm$,$ and data travel over the link at the speed of light$-3$ x $108$ m$/$s$.$

a$)$ Calculate the delay x bandwidth product for the link. $($K$=10^3,$ M$=10^6,$ B$=8$ bits$)$

Ans: Propagation delay on the link is $($Blank $1*10^9)/(3*10^8)=1845.$

The delay x bandwidth product for the link is Blank $2$MB $($the answer is in an exact float number in the format of x$.$xXX$)$

b$)$

A camera on the rover takes pictures of its surroundings and sends these to Earth. How quickly after a picture is taken can it reach Mission Control on Earth? Assume that each image is $5$ Mbit in size.

Ans: Transmit delay for $5$ Mbit of data is $5*10^6/$ bandwidth $=$ Blank $3$s$.($round the answer to an integer$)$

Thus, the total time required is Blank $4$ seconds.