Suppose users share a 4 Mbps link. Also suppose each user transmits continuously at 500
Kbps when transmitting, but each user transmits only 20 percent of the time.
a) When circuit switching is used, how many users can be supported?
b) For the remainder of this problem, suppose packet switching is used. Why
will there be essentially no queuing delay before the link if five or fewer users
transmit at the same time? Why will there be a queuing delay if nine users transmit
at the same time?
c) Find the probability that a given user (one user) is transmitting.
d) Suppose now there are 40 users. Find the probability that at any given time,
all 15 users are transmitting simultaneously. Please show your calculation details.