The article proposes an analytical method for determining basic traffic characteristics of systems which are offered overflow traffic composed of multi-rate traffic streams. The described analytical model enables determination of parameters of traffic overflowed from primary groups for systems servicing single and multi-service switching networks with overflow traffic on the basis of Ka u f man-Roberts model for full-availability group with a Poisson requests distribution stream. Additionally, a method for determining a channel occupancy distribution in the alternative group with traffic overflowed from primary groups in their occupation state has been also presented. Analytical calculation results of blocking probability calculated using the presented methodology have been compared with the data obtained from the system simulation process.
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