Question
How long does it take a packet of length 1,000 bytes to propagate over a link of distance 2,500 km, propagation speed 2.5 *10^8 m/s, and transmission rate 2 Mbps? More generally, how long does it take a packet of length L to propagate over a link of distance d, propagation speed s, and transmission rate R bps? Does this delay depend on packet length? Does this delay depend on transmission rate?
Answer
Transmission delay = L/R
= 8 bits/byte * 1,000 bytes / 2,000,000 bps
= 4 ms
Propagation delay = d/s
= 2,500 / 2.5×105
= 10 ms
Therefore, the total time = 4ms + 10 ms = 14 ms
No, the delay depend on packet lenght is not true.
No, the delay depend on transmission rate is not true.