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:  122
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:  2026
:   .., .. // . - 2026. - . 122. - .102-115.
:   , , ,
(.):  queuing systems, Kolmogorov equations, transition probability matrix, piecewise-constant parameters
:   , . - . , . , . , 3. . , . , . , , , , .
(.):  This paper considers non-stationary performance characteristics of a three-phase queuing system with common buffer of set finite size, a Poisson input flow, exponential service time on all phases, service rates described by piecewise-constant functions. A system of Kolmogorov equations is written for the system, an expression for finding loss probabilities is presented. The probability translation matrix is used to solve the system. An expression to account for the service rates' jumps is presented. A system with a buffer size of three is considered as an example. Calculations are provided for two jumps with different intervals in between and for periodical change of service rates. Dependencies of the system's transient behavior on the length of the interval and the moment at which the jump occurs are examined. The system is analyzed for parameters corresponding to modern optic networks. The conclusion is made is that the transient behavior is not dependent on the length of the interval nor on the moment of the service rates change.

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