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Seems very trivial but I'm confused which one of these correctly define transmission time.

  • Time taken by a message to reach receiver.

  • Time taken to push message on the link by the sender.

Which one is correct one?

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  • Time taken by a message to reach receiver : Propagation delay or time
  • Time taken to push message on the link by the sender : Transmission time

Transmission time is the time from the first bit until the last bit of a message has left the transmitting node. Or, in simple word it's the amount of time required for the router to push out the packet.

Packet transmission time = Packet size / Bit rate   

Reference :

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  • $\begingroup$ Or Propagation time is time to reach destination by $1$st bit? $\endgroup$ – Mr. Sigma. Dec 4 '18 at 4:26
  • $\begingroup$ @Mr.Sigma. yep, in other words you can say it's taken by one bit to travel from one node to the other (it's proportional to the length of the wire, mainly). $\endgroup$ – finn Dec 4 '18 at 13:06

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