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2011 : Evaluation of the Suitability of COTS Ethernet Routers for Distributed Real-Time Systems

Author(s)
Martin Elshuber
Abstract
Time-Triggered Ethernet (TTE) is an extension to standard Ethernet, which aims to support mixed critically applications on a single, but possibly replicated, communication channel. Currently different solutions for end systems are available, both in hardware and in software. A drawback compared to standard Ethernet is the need to use special and expensive switching hardware to provide fault containment services, and to achieve low jitter for the transmission delays of time-triggered frames. Jitter is a critical factor for the quality of the global time base needed to be established for time-triggered communication. This thesis evaluates the ability of realising mixed-critically distributed embedded real-time systems using TTE based on a Commercial off-the-Shelf (COTS) Ethernet router. Different approaches (e.g., use of virtual links, use of the processor in the router to forward messages according to a time-triggered schedule) will be analysed. One approach is selected and employed in experiments to quantify the fault isolation, performance and predictability of the ensuing system. The methods discussed in this work allow timely and reliable time-triggered Ethernet frames to be sent concurrently with classic event-triggered Ethernet frames using a COTS Ethernet router with an updated firmware. A discussion on how to extend the proposed approaches, in order to implement the complete TTE standard is included.
Bibtex
@mastersthesis{ elshuber:2011,
  author =      "Martin Elshuber",
  title =       "Evaluation of the Suitability of COTS Ethernet Routers for Distributed Real-Time Systems",
  address =     "Treitlstr. 3/3/182-1, 1040 Vienna, Austria",
  school =      "Technische Universit{\"a}t Wien, Institut f{\"u}r Technische Informatik",
  year =        "2011"
}
Download
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