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Recall that propagation delay d/s is the time to transmit one bit over a link
And transmission delay is the time to transmit a whole packet over a link
Then, why isn't packet length * propagation delay = transmission delay?
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The transmission delay is the amount of time required for the router to push out the packet. The propagation delay, is the time it takes a bit to propagate from one router to the next.
Propagation time The time required for a signal or wave to travel from one point of a transmission medium to another. Transmission time Also considered the propagation delay, or the amount of time it takes one bit to go from the start of the link to its destination.
It is an important metric to measure network performance. The delay of a packet is calculated by adding the following four components: propagation delay, transmission delay, queuing delay, and processing delay.
What Are The Different Types Of Delay? There are 3 main types of delay: tape delay, analog delay, and digital delay.
Because they're measuring different things.
Propagation delay is how long it takes one bit to travel from one end of the "wire" to the other (it's proportional to the length of the wire, crudely).
Transmission delay is how long it takes to get all the bits into the wire in the first place (it's packet_length/data_rate).
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