Discussion
A circuit switching network has the following characteristics :
Set up time = 5 sec
Propagation = 5 sec
Message size = 1 M bits
Data transmission rate = 1 M bits
Data transmission rate = 1
Kbps Number of hops = 10
When will the last bit of the message reach the receiver ?
Answer: D
Correct answer: t = 1025 sec
Circuit switching pays the setup and propagation once and then transmits the whole message:
\[ t = 5 + 5 + \frac{10^{6}}{10^{3}} + \ldots = 1025\ \text{s} \]
The transmission time dominates: a megabit at a kilobit per second takes a thousand seconds, and the setup and propagation add the rest.
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