Suppose there is exactly one packet switch (or router) between a sending host an

Question

Suppose there is exactly one packet switch (or router) between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are R1 = 1Mbps and R2 = 2Mbps, respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length 18000bits? Assume that the propagation speed is 2 * 108 meters/sec, the distance between source and the router is 20,000 km, the distance between the router and the destination is 10,000 km (Ignore queuing delay and processing delay, considering transmission delay and propagation delay).

Explanation / Answer

Solution:

Given that, The transmission rate between the sending host and the switch R1 = 1Mbps.
ransmission rate between the switch and the receiving host is R2 = 2Mbps

Let us assume at the time interval t0 the sending host begins to transmit.
Then at time t1 = L/R1, the sending host completes transmission and packets are at router.
t1 = 18000/1Mbps
t1 = 18000 sweconds.
At time t2 = t1 + L/R2,
t2 = 18000 + 18000/2
t2 = 27000 sec.
And the router completes transmission.
then endtoend delay is nothing but t2.
= 27000 sec

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