Dissertation by master`s work

Program systems of designing of networks - the tool which can be useful to any manager of a corporate network, especially at designing a new network or entering of cardinal changes in already existing. Products of the given category allow to check up consequences of introduction of those or other decisions even before payment of the got equipment. Certainly, the majority of these software packages cost dearly enough, but also the possible economy can be too rather big.
Programs of designing of a network use in the work the information on a spatial arrangement of a network, number of units, configurations of communications, speeds of the data transmission, used reports and type of the equipment, and also about appendices carried out in a network. Systems of designing solve some private problems of designing. But in the given sphere there are no methods, means of automation of a complex settlement substantiation of a choice of applied technology, structure of the equipment, the account of capital and operational expenses. The unreasonable choice of applied technology, at the initial stage of development, is one of the basic mistakes of designing.Consequences which can become inefficient use of liaison channels, that in turn attracts the unjustified charge of material means connected with a lining and rent of channels, cost of the equipment. Or the opposite situation - when will not suffice resources of the channel for maintenance of the set degree of quality.
In the beginning of development CAD it is necessary to analyse the basic design stages for each technology and to formalize the list of initial data. A following stage is creation databases (DB). The DB should contain data about capital and эксплутационных expenses, characteristics of channels and the used equipment. The logic of work CAD consists in calculation of parameters of quality of a network and its cost for three technologies at the same initial data.Target data are used for functionally cost analysis with the purpose of decision-making on used technology for a projected network.
By development CAD the special attention is given to forecasting of parameters of network loading and its distribution on communication lines that at the set structure and a level of requirements to quality of communication the customer could receive the answer to a question on what is necessary for this purpose a network resource both what capital and operational expenses are attracted with use of this or that technology.
CAD includes:
· the module of forecasting of intensity of the entering streams generated by subscribers of a network;
· the module of forecasting интенсивностей streams on information directions of the allocated network, i.e. the module of formation of a so-called matrix of information gravitation between objects of a network;
· The module of formation of topology of a network on the basis of a matrix of information gravitation; the module of the analysis of the received topology;
· the module of an estimation of loading of liaison channels at application of various ways of routing. Search of the shortest ways to networks of the set structure and distribution of streams of the information on the found routes;
· The module of calculation of necessary throughput of digital pathes of communication, under condition of performance of normative requirements to parameters of a time transparency of a network;
· the module of calculation of parameters of a time transparency of a network;
· the module of comparison of parameters with set and repeated recalculation;
· the module of calculation of expenses for the equipment and rent of network resources and their minimization.

Results of calculations of each block are brought in a file and used as initial data for a following stage of calculation. The system of automation proection is opened and allows independently to use separate modules. With the purpose of simplification of work of users the dialogue mode and use machine schedules are provided.