QoS - Calculating path latency

I have a question. I've been reading Wendell Odom's cisco press book 'Cisco
QoS, Exam Certification Guide'. In it he calculates total latency for the
path as processing delay, serialization delay, propagation delay, etc... My
question is why do we calculate serialization delay only as the packet is
leaving the interface and being placed on the wire and not ALSO when the
packet is being received by the remote router. Surly there is some delay to
take an incoming packet off of the wire and store the bytes in memory prior to
processing it. So in other words, in the network as PC1-->R1-->R2-->PC2 why
are we not including the delay to get the packet off of the wire and into
R2. ie, assume packet is already in R1--> processing delay, seralization
delay of R1, propagation delay to reach R2 and then serialization delay again
to get the packet into R2 for its processing?
 
BTW, I know I grossly
missquoted Odom by only including processing delay, serialization delay,
propagation delay, etc... He has a lot more delay types in his book. My
question really only focuses on the packet that is in R1 and getting into R2
so I omitted the others.
 
I appreciate anyone's feedback.
 
Thanks guys.
Make a small loan, Make a big difference - Kiva.org

Blogs and organic groups at http://www.ccie.net
Received on Sat Jan 12 2013 - 11:41:51 ART