Question $(1$B$)-$ A slotted ALOHA network transmits $200-$bit frames on a shared channel of $200$ kbps$.$ What is the throughput if the system $($all stations together$)$ produces the following number of frames per second?

i$)1000$ frames per second

ii$)500$ frames per second

iii$)250$ frames per second

Question $(1$C$)-$ A digital signalling system is required to operate at $4800$bps$.$

i$)$ If a signal element encodes a $4-$bit word, what is the minimum required bandwidth of the channel if we assume a noise free system?

ii$)$ What will be the bandwidth, if $4$ signal levels are used instead?