Timing analysis of AVB Ethernet network using the Forward end-to-end Delay Analysis

Abstract

Audio Video Bridging Ethernet (AVB) [1] is a standard developed by IEEE Audio Video Bridging Task Group based on switched-Ethernet. It is used in the automotive domain. AVB includes flow differentiation service using Fixed Priority (FP) policy. It ensures a class level credit based shaping (CBS) for high priority flows in each switch. A guaranteed upper bound on End-to-end (ETE) delays, in such a network, is mandatory for certification purpose. Some methods such as Compositional Performance Analysis (CPA) or Trajectory Approach (TA) have been designed to determine worst-case ETE delays in AVB networks. The Forward end-to-end delay Analysis (FA) has been initially developed for AFDX network for a First In First Out (FIFO) or FP/FIFO scheduling. In this paper, we extend it to take into account the CBS algorithm to cover also AVB networks. Finally, we apply FA on a sample configuration and compare the results to the aforementioned approach CPA.