20. Dimension a system with the average o ered traffic A = 20 Erlang (A = \"norm

Question

20. Dimension a system with the average o ered traffic A = 20 Erlang (A = "normal load"). In
normal load condition (offered traffc is A), the blocking probability should be less than 1%
(i.e., C(m;A) < or = 1 %). During 50% "overload" condition, it should maintain C(m; 1:5A)< or = 5%.
Find the number of servers n to satisfy both then normal load condition and 50% overload
condition. After dimensioning the system, nd the blocking and utilization for both normal
load and overload condition (use Erlang table).

Explanation / Answer

Number of servers to be need is

50% * 20 =10 + 10*1%=11.1~12

So they will need 12 servers overall.

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