**:** ..,

..,

..
**:**
**:** 105
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**:** 2023
**:** .., .., .. // . 105. .: , 2023. .6-29. DOI: https://doi.org/10.25728/ubs.2023.105.1

** :** , , Network Calculus, , - - , , ,

** (.):** cyberphysical system, Network Calculus, mini/maxi plus algebra, service curve, availability, safety and security

**:** , , , , , , . , , . - - , . , - - , , - - . , , . , , , .

** (.):** The paper analyzes the evaluation of the system's own characteristics, the so-called service curve, set in the form of deterministic constraints linking the input of the system and the minimum flow at the output of the system. The service curve estimation is considered within the framework of the Network Calculus method and mini-maxi plus algebra approaches, which form the mathematical basis of the method. To evaluate the service curve, one previously developed method related to the duality of mini and maxi plus algebra transformations is taken, and a new method based on the connection of two types of mini and maxi service curves is proposed. The methods are considered taking into account their application to real systems and existing limitations on measurement capabilities, in particular the finiteness of the definition ofthe observed data flows. The analysis of the both methods shows that each of the them gives an acceptable service curve, but they need improvement for the calculated service curve to correspond to the maximum system performance mode.

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