3. BASIC QUEUING PROCESS INPUT SOURCE UNITS CALL FOR SERVICE QUEUE QUEUE DISCIPLINE SERVICE MECHANISM SERVED UNITS LEAVE
4. ERLANG’S MODEL: M/M/1: (FIFO/∞/∞) P 0 = Prob. Of zero units in the system= 1 ─ P n = Prob. Of n units in the system = ( 1─ )( n= 0,1,2,3, ) n L = Expected number of units in the system = W = Expected time spent by a unit in the system = L q = Expected number of units in queue = W q = Expected time spent by a unit in the queue =
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