Exploring the worst-case timing of Ethernet AVB for industrial applications
Jonas Diemer, Jonas Rox, Rolf Ernst, Feng Chen, Karl-Theo Kremer, Kai R. Richter · 2012
Predictable and low-latency communication timing is one of the major challenges for employing Ethernet-based networks in industrial automation. The evolving Ethernet AVB standard appears to be a promising architecture, as it provides mechanisms for predictable timing with standard Ethernet hardware. However, the worst-case timing of Ethernet AVB still has to be evaluated. In this paper, we analyze the timing of Ethernet AVB using both simulation and a formal worst-case analysis based on Compositional Performance Analysis known from embedded computing systems. We investigate two industrial scenarios, a typical line topology and a more complex two-level network, and compare the results from analysis and simulation. This allows us get a good indication of the applicability of the current Ethernet AVB with respect to predictable low-latency timing in industrial automation networks. We also gain an understanding of the benefits and limitations of formal Compositional Performance Analysis compared to simulation in this context.