Network Simulation Using SIMSCRIPT II.5

Rockwell International Science Center; Thousand Oaks, CA

Most communications networks of interest involve a complexity that extends beyond the restrictive assumptions required of analytical methods of study. These systems can be studied effectively by the use of Discrete Event computer simulation models.

SIMSCRIPT II.5 was used to model Rockwell's Corporate Network. The program models the network dynamics on a message or call level, that is, each is accounted for in the simulation of network operation and performance, thus assuring the completeness of results.

Network simulation usually involves a number of mutually dependent components (nodes and links) working in a concurrent or pseudo-parallel fashion. These components can be thought of as processes, that is, logical groupings of related state changing events separated by quiescent periods. Using SIMSCRIPT II.5, "instances" or copies of an identical process prototype can be created and executed asynchronously. The semantics and software mechanisms of the language fit the needs of the network model.

Alternatives Considered: None

Benefits of SIMSCRIPT II.5: Comparison of simulation results with actual call log data demonstrates the feasibility of using the simulation approach for design of such efforts.

Customer Quote: "The modeling/programming effort required to accomplish the task is substantially reduced by the use of a problem-oriented language like SIMSCRIPT II.5."