Example$$Link rate $($R$)=1$ Mbps

Each user is active $10\%$ of time, and uses $100$ kbps when active

Circuit switching $$ allows $10$ users

Packet switching $$ allows $35$ users $$ How?

If there are $35$ users, the probability that there are $11$ or more simultaneously active users is approximately $0\mathrm{.}0004$