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Demonstration is made of how a digital communications system is simulated by a computerized model. Illustrations are given to show how the computer simulation becomes a helpful decision-making technique to guide the designer and engineering manager in designing to, and proving out the design to, systems specifications; in rapidly evaluating design changes; in establishing improved system monitoring and alarming; and in determining reliability figure of merit. The model is patterned upon a computer programming synthesis of all system scenarios and logic elements which are configured with virtual inputs, outputs, states, and inter-element connectivity. Simulated failures can be injected into any part of the system in any time frame as catastrophic failures or noise spike to study system performance. Computer simulation model has been used to evaluate system performance and to suggest desirable design improvements.