The $1982$ Ethernet specification allowed between any two stations up to $1500m$ of coaxial cable, $1000m$ of other point$-$to$-$point link cable, and two repeaters. Each station or repeater connects to the coaxial cable via up to $50m$ of "drop cable." Typical delays associated with each device are given in Table $2\mathrm{.}5($where $c=$ speed of light in a vacuum $=3{10}^8\frac{m}{s}).$ What is the worst$-$case round$-$trip propagation delay, measured in bits, due to the sources listed? $($This list is not complete; other sources of dety include sense time and signal rise time.$)$