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Suppose A is sending only one packet to B over link. let transmission time is Tt and propagation time is Tp

Then why we always take Total Time = Tt + Tp

and not as = 2*Tt +Tp  

As packet will take  one more Tt to get out of link from receiver side

can some one please answer this ?

2 Answers

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As soon as a data bit reaches the receiver, it is immediately taken up by it. This data is either stored in a buffer or is send to higher layers for further processing. The time taken by the receiver to read the data from the channel/medium is negligible. So, no extra $T_t$, i.e. transmission time is required to be added.   Therefore, total time= $T_t + T_p$

 

I hope it helps.
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Definition of transmission time-time taken by sender to put the data onto the link/channel.There is no concept of using transmission time for packet to get out of link/channel from receiver side,as receiver will accept that packet and there are 7 layers in OSI model so this packet can be sent at the upper layers from receiver side without using any transmission time.

hence total time =TT+PT not 2*TT +PT

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