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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Computer Networks And The Internet
Exercise:
Review
Question:18 | ISBN:9780132856201 | Edition: 6

### 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?

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.

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