Discussion
A packet switching network (highly loaded) has the following characteristics:
Propagation delay = 2 sec/hp.
Data transmission rate = 1.
Packet size = r bit = 512 bits.
Number of of hops = 10.
At what time the last bit of the last packet will reach the receiver ?
Answer: A
Correct answer: 1024.5 sec
In packet switching the message is divided into packets which travel one behind another, so the pipeline is full after the first packet reaches the far end and the remaining packets follow at the transmission rate. Adding the propagation over the hops to the transmission of all the packets gives about 1024.5 s - very close to the circuit-switched figure, because the message is large enough for transmission time to dominate both.
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