Given a queue with a certain arriving load and number of servers, the @PEL function determines the fraction of customers lost due to all servers begin busy. In this example, we use @PEL to solve for the number of servers that limit customer loss to 5%.

MODEL:

! Arrival rate of customers/ hour;

  AR = 25;

! Service time per customer in minutes;

  STM = 6;

! Service time per customer in hours;

  STH = STM/ 60;

! Fraction customers finding all servers busy;

  FB = .05;

! The PEL function finds number of servers needed, NS;

  FB = @PEL( AR * STH, NS);

END

Model: EZQUEUE