Computing end-end delay (transmission and propagation delay)
Consider the figure below, with three links, each with the specified transmission rate and link length.
Assume the length of a packet is 8000 bits. The speed of light propagation delay on each link is 3x10^8 m/sec
Round your answer to two decimals after leading zeros
Question List
1. What is the transmission delay of link 1?
2. What is the propogation delay of link 1?
3. What is the total delay of link 1?
4. What is the transmission delay of link 2?
5. What is the propogation delay of link 2?
6. What is the total delay of link 2?
7. What is the transmission delay of link 3?
8. What is the propogation delay of link 3?
9. What is the total delay of link 3?
10. What is the total delay?
Solution
Link 1 transmission delay = L/R = 8000 bits / 100 Mbps = 8.00E-5 seconds
Link 1 propagation delay = d/s = ()2 Km) * 1000 / 3*10^8 m/sec = 6.67E-6 seconds
Link 1 total delay = d_t + d_p = 8.00E-5 seconds + 6.67E-6 seconds = 8.67E-5 seconds
Link 2 transmission delay = L/R = 8000 bits / 1000 Mbps = 8.00E-6 seconds
Link 2 propagation delay = d/s = ()5000 Km) * 1000 / 3*10^8 m/sec = 0.017 seconds
Link 2 total delay = d_t + d_p = 8.00E-6 seconds + 0.017 seconds = 0.017 seconds
Link 3 transmission delay = L/R = 8000 bits / 10 Mbps = 0.0008 seconds
Link 3 propagation delay = d/s = ()2 Km) * 1000 / 3*10^8 m/sec = 6.67E-6 seconds
Link 3 total delay = d_t + d_p = 0.0008 seconds + 6.67E-6 seconds = 0.00081 seconds
The total delay = d_L1 + d_L2 + d_L3 = 8.67E-5 seconds + 0.017 seconds + 0.00081 seconds = 0.018 seconds
That's incorrect
That's correct
The answer was: 8.00E-5
The answer was: 6.67E-6
The answer was: 8.67E-5
The answer was: 8.00E-6
The answer was: 0.017
The answer was: 0.017
The answer was: 0.0008
The answer was: 6.67E-6
The answer was: 0.00081
The answer was: 0.018