Abstract
As a first step in the investigation of communications networks with automatic alternate routing, a simulator has been prepared using the IBM 7090 high-speed digital computer. The simulator is capable of being applied to a large class of networks, the principal restrictions being that blocked calls are cleared, and no congestion or delay is encountered at the switching points. Although the first version of the simulation program requires that the alternate routing plan be fixed in advance (i.e., before a run), the program design is such that traffic-dependent alternate routing doctrines can easily be provided. The simulator has so far been used to examine the behavior of small networks of various sizes, configurations, and alternate routing doctrines under normal and abnormal conditions of load. Several criteria are introduced and used to evaluate the relative performance of different networks, leading to conclusions regarding the merits of certain alternate routing procedures and the areas of profitable application of the networks studied. The overload capabilities of these networks are of particular interest and are examined in some detail.
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