ה- Propagation Delay תמיד קצר יותר מה- Transmission Delay.

Transmission Delay: This is the amount of time required to transmit all of the packet's bits into the link. Transmission delays are typically on the order of microseconds or less in practice. L: packet length (bits) R: link bandwidth (bps) so transmission delay is = L/R Propagation Delay: Is the time it takes a bit to propagate from one router to the next; it is a function of the distance between the two routers, but has nothing to do with the packet's length or the transmission rate of the link. d: length of physical link S: propagation speed in medium (~2x108m/sec) so propagation delay is = d/s