Worst-Case Backlog Evaluation of Avionics Switched Ethernet Networks with the Trajectory Approach

Worst case backlog evaluation is a key issue to avoid under or over sizing of output port buffers for store-and-forward switches. Typically, the dimensioning of switches in the context of avionics is at least as important as the upper bounding of the end-to-end delays. This paper presents a new method based on the Trajectory approach for backlog evaluation of output ports of AFDX switches. On an industrial AFDX configuration, this new method leads to an average buffer size reduction of 10% compared to the existing Network Calculus approach.