Service time of a successive arrivals are denoted by
. They may be constants or random variables. If they are
random variables, they follow certain distribution.
A queueing system consists of service centers and
Each service cetner contains a number of servers, c.
Transition state and steady state: simulation needs some time
to ``warm up'' from a initial state to a steady state. The status in a
transition state should not be considered as indicative as typical
measures. One should always wait until certain time elapses before