. In article new approach to simulation and design of infocommunication systems, in which hierarchical multi-level routing is provided, is offered. Authors considered elements of a set-theoretic base and system of models of infocommunication system, operating not only traditional model elements – bipolar communication networks, – but also the multiple segments such as circuit, star, ring and tree. With use of provisions of the theory of sets to the basic concepts and procedures of a reference model of open system interconnection authors put in compliance mathematical objects providing the strict formal description of infocommunication system in which multipath multiple address physical and logical connections "point-to-multipoint", "multipoint-to-point", "multipoint-to-multipoint" are implemented. On the example of simulation of property of structural reliability of specific infocommunication system constructibility, visualization and systemacity of the developed approach are shown.
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