It is well know (see this question) and easily verifiable that end-to-end delay in case of trasmission of P packets of size L over N equal links (same transmission rate R) with zero propagation delay is given by the formula
N*L/R + (P-1)*L/R
I'd like to know how change this formula if we add propagation delay in the hypothesis that all the links are of the same distance D and speed C.
In my convinction the propagation delay does not affect the transfert delay, and every link add a propagation delay of D/C so the formula should be:
N*L/R + (P-1)*L/R + N * D/C
I looked for confirmation in the literature but couldn't find any source on how to add the (simplified) propagation delay, so I'm asking here.
This is not an home work: I'm looking for a more complete formula. The base formula already use simplified assumptions, so why not add the propagation delay too ?
