Before revision:  An extensive analysis of such a proposal is conducted herein regarding the accuracy of delay bounds and its impact on the system performance, i. e., scalability and resource-efficiency; and the results highlight its outperformance, in comparison to conventional methods .
After revision:  An extensive analysis of such a proposal is conducted herein regarding the accuracy of delay bounds and multiple-ring networks, as well as under Arbitrary and Fixed Priority multiplexing. A sensitivity analysis of the computed delay bounds for mono and multiple-ring networks is conducted with respect to various flow and network parameters, and their tightness is assessed in comparison with an achievable worst-case delay. A noticeable enhancement of the delay bounds, thus network resource efficiency and scalability, is highlighted under our proposal with reference to conventional approaches. Finally, the efficiency of the PMOC approach to provide timing guarantees is confirmed in the case of a realistic avionics application .