Worst-case synchronization precision of IEEE802.1AS
Résumé
Time Sensitive Networking (TSN) is gaining interest in the critical embedded networking community thanks to the various Quality of Service (QoS) mechanisms that can be rolled out to offer different levels of determinism to flows in a switched Ethernet network. Among these standards, limited jitter flows can benefit from the Time Aware Shaper (TAS) which requires the deployment of the IEEE802.1AS synchronization. Indeed, TAS assumes a global time with a bounded drift between any two nodes. In this paper, we derive a refined and general mathematical model that offers upper and lower bounds on the worst-case precision that can be applied to different Ethernet technologies. Results for 100Base-T and 1000Base-T technologies are given. Both simulations and empirical measurements validate the almost two times closer upper bound we obtain compared to the state-of-the-art model.
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