Circuit switched versus packet switched network

State in which situations a circuit switched network is better choice than a packet switched network and in which situation a packet switched network is better? Suppose a user shares an n Mbps link and this alternates between periods of activity (when the user generates data at a constant rate of m kbps) and periods of inactivity (When user generates no data). Suppose that the user is active 90% of the time. Which will be a better choice circuit switched network or a packet switched network?

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