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Infact queing delay is variable, and three RTTs are not enough to measure a good estimate of queing delay. In this case, we need to measure the analysis of like arround 10-100 RTTs to get a sufficient good estimate of queing delay. The more RTTs we have in a set for a router, the more better estimate we can fetch.
Once Once we have the queing delay from source to router A, we can easily find the tramission delay. Once we have transmission delay we can figure out the Incoming data rate of that router.
We know that RTT from A to R1 = 2(PdA + Td1 + Qd1), lets consider Pd, is 0 compare to Td and Qd then
RTT from A to R1 = 2(Td1 + Qd1)
Td1 = RTT/2 - Qd1
RTT from A to R2 = 2(Td1 + Qd1) + 2(Td2 + Qd2)
= 2(Td1 + Td2 + Qd1 + Qd2)
Td2 = RTT/2 -Td1 - Qd1 - Qd2
In order to get a good estimate of TD we calculate the average RTT for each hop avgRTT1 = avg(RTT1, RTT2, RTT3) for router R1.
Hence the transmission delay for nth hop is given below:
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