Anatomy of Delay

Transmission vs. propagation: where are the first and last bits? · Problem P6 (Kurose)

Link A → B, drawn to scale

Is the packet shorter or longer than the link? Make your prediction before revealing.

packet bits on the link first bit (head) last bit (tail)
t = 0 s

Keyboard: space plays or pauses · arrows step forward or back · Home / End · 1–4 jump to key moments.

Space-time diagram

packet occupying the link first bit last bit now (dashed line)

Calculator

Enter the data from any problem to check it. Accepts a decimal point or comma, and notation like 2.5×10^8 or 2.5e8. No processing or queuing delay.

dtrans = L / R
dprop = l / vp
end-to-end
packet length vp·L/R

Regime and answer hidden in prediction mode.