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The following parameters are defined for a switching network: Number of hops between two given end devices = N Length of a message = M
The following parameters are defined for a switching network:
Number of hops between two given end devices N
Length of a messageM bits
The data speed B bps bits per second on all network links
Fixed packet size P bits
Header size H bpp bits per packets
Call set up time for Circuit switching S sec
Propagation delay per hop D sec
For N hops, L bits, Ssec Bbps Pbits, Dsec and Hbpp Find the
endtoend delay for circuit switching and datagram packet switching. Assume that no
acknowledgement and processing delay exist at the nodes. points
Hint: For CS: let endtoend delay C C where
C Call Setup Time
C Message Delivery TimePropagation Delay Transmission Time
Consider how to determine transmission time
For Datagram Packet Switching: let endtoend delay D D D D where
D Time to Transmit and Deliver all packets through first hop
D Time to Deliver last packet across second hop
DTime to Deliver last packet across third hop
DTime to Deliver last packet across forth hop.
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