I think we are having some problems interpreting the delays.
The processing time is included in the sender of the package (I think not by definition but it can include the time to generate the header on the sender).
The router requires a package to be waiting to be received until it can be sent to the next (generating a delay equivalent to transmit one package in each link)?
The graph of space vs time is the one that shows the delays?
A packet is transmitted one bit after the other. All the bits travel through the link till one receiver (router or end system) taking a time proportional to the distance covered. Packet is not fully received till both, transmission delay and propagation delay have elapsed.
Routers are store and forward. They cannot start forwarding until the packet has been completely received (all of its bits). This waiting time is not an additional delay.
A graph of space vs time shows graphically the evolution of the transmission through space and time. It may help us understanding which delays may overlap and which may not.
Nice picture!
ReplyDeleteI think we are having some problems interpreting the delays.
ReplyDeleteThe processing time is included in the sender of the package (I think not by definition but it can include the time to generate the header on the sender).
The router requires a package to be waiting to be received until it can be sent to the next (generating a delay equivalent to transmit one package in each link)?
The graph of space vs time is the one that shows the delays?
That's a lot of questions. Let's see:
ReplyDeleteA packet is transmitted one bit after the other. All the bits travel through the link till one receiver (router or end system) taking a time proportional to the distance covered. Packet is not fully received till both, transmission delay and propagation delay have elapsed.
Routers are store and forward. They cannot start forwarding until the packet has been completely received (all of its bits). This waiting time is not an additional delay.
A graph of space vs time shows graphically the evolution of the transmission through space and time. It may help us understanding which delays may overlap and which may not.