A.B. Ivanov, S.S. Kotlyar, A.F. Tashoyan

There is necessity of modeling of both testing operations and incident generation and completion processes to increase efficiency of modern informational and telecommunication networks (ITN) at the expense of reduction of time of detection and elimination of transmission lines malfunction. Usage of colored Petri nets, which allow to formalize processes of tests planning and incidents processing in form of generalized system monitoring model and therefore optimize management of technical operation of modern ITN, is suggested. Methodologically synthesis of Petri nets on the basis of functional subnets with representation of system behavior in time as functions of change of state of its objects set is implemented. Received in such way multi-polar Petri net is constructed dynamically in time (horizontal net branches represent task or incident life cycle) using private Petri nets with allocation of necessary sequences of terminal timed subnets for analysis of functioning of any object. Formation of the net for the purpose of testing processes modeling is implemented so that its entrance positions would correspond to testing facilities with markers located in them on the number of appointing tests, its transitions would correspond to testing procedures. Positions and transitions are connected with arches of three types along which markers of corresponding color can move. Such network representation allows to fulfill dynamic planning and re-planning of tests with their optimum placing on time axis. Net formation is implemented in strict conformity with incidents life cycle, which allows for times of both incident processing and works on transmission line, for the purpose of incidents handling modeling. In case of transfer line failure when one of the tests can-t be executed transition from testing to incident handling is carried out by software which status is defined by functional subnet on values of target factors - the input variables defined both by result of current test and kind of modeled equipment failure. As in Petri net all system operation is displayed by movement of markers, in an interval between two sequential times of monitoring system state change nothing happens in model and no special imitation of equipment or maintenance staff of ITN operation needed. The sequence of monitoring system states on monitoring time interval allows to predict ITN taking incidents into account.