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Extending FTT-SE protocol for Multi-Master/Multi-Slave Networks
Mälardalen University, School of Innovation, Design and Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ethernet Switches are widely used in real-time distributed systems as a solution to guarantee the real-time behavior in communication. In this solution there are still some limitations which are the important obstacles obtaining timeliness in the network. These limitations are the limited number of priority levels as well as the possibility of memory overruns with consequent messages. The mentioned limitations can be eliminated using a master/slave technique along with FTT paradigm. The FTT-SE protocol which is a technique based on the master/slave and FTT methods was proposed to overcome the mentioned limitations. However, the FTT-SE protocol has been investigated for a small network architecture with a single switch and master node. Extension of this solution to larger networks is still an open issue. Three different architectures were suggested to scale the FTT-SE to large scale network. In this thesis we propose a solution that extends the FTT-SEprotocol while keeping the real-time behavior of the network. In this solution, we divided the network into a set of sub-networks, each contains one switch, set of slave nodes and one master node that connected to the associated switch in the network. Moreover, the switches are connected together directly without gateways and form a tree topology network. The solution includes both synchronous and asynchronous traffic in the network. We also show that the timeliness of the traffic can still be enforced. Moreover, to validate the solution we have designed and implemented a simulator based on the Matlab/Simulink which is a tool to evaluate different network architecture using Simulink blocks. All transmission can be visualized by the ordinary Scope block in the Simulink. Moreover, the end-to-end delay for all messages is calculated after the simulation running to show the response time of the network. Furthermore, the response time analysis is done for both synchronous and asynchronous messages in this thesis according to the proposed solution. The results from simulation and the analysis are compared together to validate the investigations.

Place, publisher, year, edition, pages
2012. , 62 p.
Keyword [en]
Real-time and embedded systems, Flexible Time Triggered over Switched Ethernet, Ethernet Switch, Network Scheduling, Network real-time systems
National Category
Engineering and Technology
URN: urn:nbn:se:mdh:diva-14464OAI: diva2:515924
Available from: 2012-04-20 Created: 2012-04-16 Last updated: 2012-04-20Bibliographically approved

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