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We propose a formal timing analysis of an extension of the AFDX standard,incorporating the TSN/BLS shaper, to homogenize the avionics communicationarchitecture, and enable the interconnection of different avionics domains withmixed-criticality levels, e.g., current AFDX traffic, Flight Control andIn-Flight Entertainment. Existing Network Calculus models are limited to threeclasses, but applications with heterogeneous traffic require additionalclasses. Hence, we propose to generalize an existing Network Calculus model todo a worst-case timing analysis of an architecture with multiple BLS onmulti-hop networks, to infer real-time bounds. Then, we conduct the performanceanalysis of such a proposal. First we evaluate the model on a simple 3-classessingle-hop network to assess the sensitivity and tightness of the model, andcompare it to existing models (CPA and Network Calculus). Secondly, we study arealistic AFDX configuration with six classes and two BLS. Finally, we computea real use-case to add A350 flight control traffic to the AFDX. Results showthe good properties of the generalized Network Calculus model compared to theCPA model and the efficiency of the extended AFDX to noticeably enhance themedium priority level delay bounds, while respecting the higher priority levelconstraints, in comparison with the current AFDX standard.

Network Calculus-based Timing Analysis of AFDX networks incorporating multiple TSN/BLS traffic classes