Question from Kurose Ross 6th edition. Q #R 13

[Sooraj Siddharth]

• R 13) Suppose userd share a 2 Mbps link. Also suppose each user transmits continuosly at 1Mbps when transmitting, but each user transmits only 20 percent of the time.(See the discussion of statistical multiplexing in Section 1.3.)
•     a) When circuit awitching in used, how many users can be supported?
•     b) For the remainder of this problem, suppose packet switching is used. Why will they there be essentially no queuing delaybefore the link if two or fewer users transmit at the same  time? Why will there be a queueing delay if three users transmit at the same time?
•      c) Find the probability that a given user is transmitting.
•      d) Suppose now there are three users. Find the fraction of time during which the queue grows.

               Dear all,
             I have got the correct answers for q's a, b and c.  I am unable to visualize Q) d. Please tell me how it can be solved.

     Please bear with me as it is the starting of the semester. Thank you.
  

[Frank (sjsu) Lin]

You're well ahead of everyone else.  That's a good thing.  Maybe you can help teaching the class about circuit switching and packet switching next Thursday.  Wanna do it?

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[Sooraj Siddharth]

Dear Professor Frank Lin,
                                     I am very thankful for the opportunity you are giving me. I will prepare for the seminar. Can I plan to make a power-point presentation and send it to you so that I wouldn't be using my pen drive in your computer? Thank you very much for your reply on a holiday. Happy weekend Professor :)!!!

[Frank (sjsu) Lin]

​that will be fine.​