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Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors:
James F. Kurose, Keith W. Ross
Exercise:
Problems
Chapter:
Computer Networks And The Internet
Edition:
6
ISBN:
9780132856201
Question:
2

 

Question

Equation 1.1 gives a formula for the end-to-end delay of sending one packet

of length L over N links of transmission rate R. Generalize this formula for sending P such packets back-to-back over the N links.

Answer

Consider the given data

           N = Total number of links

           R = Transmission rate

           L = Packet length

           P = packets that tramnsmit over the N link

The following is the formula of back-to-back delay of sending P packets, each of length L over N links of transmisson rateR=d_{back-to-back}=PN\left ( \frac{L}{R} \right )

0 1

Discussions

cml cgdm

first packet's delay N\frac{L}{R}  but, consecutive packet's delay would be \frac{L}{R} , because they are not at the beginnig. They are at the router just before the final host. When a packet comes to final destination, at the same time next packet come to the router previous packet left. Then formula would be N\frac{L}{R}+(P-1)\frac{L}{R}  . First term for the first packet and second term is for remaining packets.

Trueman

Yes this is the correct formula,  N\frac{L}{R}+(P-1)\frac{L}{R}

Post the discussion to improve the above solution.