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DOI: 10.4230/LIPIcs.ECRTS.2020.17
Impact of AS6802 Synchronization Protocol on Time-Triggered and Rate-Constrained Traffic

Authors: Anaïs Finzi and Luxi Zhao

Published in: LIPIcs, Volume 165, 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020)

Abstract
TTEthernet is an Ethernet-based synchronized network technology compliant with the AFDX standard. It supports safety-critical applications by defining different traffic classes: Time-Triggered (TT), Rate-Constrained (RC), and Best-Effort traffic. The synchronization is managed through the AS6802 protocol, which defines so-called Protocol Control Frames (PCFs) to synchronize the local clock of each device. In this paper, we analyze the synchronization protocol to assess the impact of the PCFs on TT and RC traffic. We propose a method to decrease the impact of PCFs on TT and a new Network Calculus model to compute RC delay bounds with the influence of both PCF and TT traffic. We finish with a performance evaluation to i) assess the impact of PCFs, ii) show the benefits of our method in terms of reducing the impact of PCFs on TT traffic and iii) prove the necessity of taking the PCF traffic into account to compute correct RC worst-case delays and provide a safe system.
Cite as

Anaïs Finzi and Luxi Zhao. Impact of AS6802 Synchronization Protocol on Time-Triggered and Rate-Constrained Traffic. In 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 165, pp. 17:1-17:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{finzi_et_al:LIPIcs.ECRTS.2020.17,
  author =	{Finzi, Ana\"{i}s and Zhao, Luxi},
  title =	{{Impact of AS6802 Synchronization Protocol on Time-Triggered and Rate-Constrained Traffic}},
  booktitle =	{32nd Euromicro Conference on Real-Time Systems (ECRTS 2020)},
  pages =	{17:1--17:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-152-8},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{165},
  editor =	{V\"{o}lp, Marcus},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2020.17},
  URN =		{urn:nbn:de:0030-drops-123808},
  doi =		{10.4230/LIPIcs.ECRTS.2020.17},
  annote =	{Keywords: AS6802, TTE, Modeling, Performance analysis}
}
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