On the Evaluation of Clock Synchronization Methods for Networked Control Systems
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26230%2F13%3APU106376" target="_blank" >RIV/00216305:26230/13:PU106376 - isvavai.cz</a>
Výsledek na webu
<a href="http://www.fit.vutbr.cz/research/pubs/all.php?id=10371" target="_blank" >http://www.fit.vutbr.cz/research/pubs/all.php?id=10371</a>
DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
On the Evaluation of Clock Synchronization Methods for Networked Control Systems
Popis výsledku v původním jazyce
A distribute control requires to maintain time synchronization with a degree of precision depending on a particular application domain. Many large distributed systems employ Ethernet or even full TCP/IP stack for communication. Two prevalent protocols are used for clock synchronization in these networks, in particular, Network Time Protocol (NTP) and Precise Time Protocol (PTP). In this short paper, we present a method for practical performance evaluation of clock synchronization within a distributed environment based on the QNX real time operating system. For the measurement we consider nodes that are assumed to produce synchronous signals. The results of measurement provide a hint on the degree of synchronization that can be practically reached among the set of distributed devices. To be able to perform NTP and PTP benchmarking, we ported PTPd Unix/Linux implementation to QNX operating system. We prepared an environment to compare NTP and PTP behavior in different network topologies and under different network load characteristic. The main contribution of this paper is to provide an overview of a method for practical evaluation of synchronization methods for a distributed control system. We present some preliminary results from the measurement. A complete result set may be used, e.g., for defining a performance estimation function in a platform-based design methods.
Název v anglickém jazyce
On the Evaluation of Clock Synchronization Methods for Networked Control Systems
Popis výsledku anglicky
A distribute control requires to maintain time synchronization with a degree of precision depending on a particular application domain. Many large distributed systems employ Ethernet or even full TCP/IP stack for communication. Two prevalent protocols are used for clock synchronization in these networks, in particular, Network Time Protocol (NTP) and Precise Time Protocol (PTP). In this short paper, we present a method for practical performance evaluation of clock synchronization within a distributed environment based on the QNX real time operating system. For the measurement we consider nodes that are assumed to produce synchronous signals. The results of measurement provide a hint on the degree of synchronization that can be practically reached among the set of distributed devices. To be able to perform NTP and PTP benchmarking, we ported PTPd Unix/Linux implementation to QNX operating system. We prepared an environment to compare NTP and PTP behavior in different network topologies and under different network load characteristic. The main contribution of this paper is to provide an overview of a method for practical evaluation of synchronization methods for a distributed control system. We present some preliminary results from the measurement. A complete result set may be used, e.g., for defining a performance estimation function in a platform-based design methods.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
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OECD FORD obor
10201 - Computer sciences, information science, bioinformathics (hardware development to be 2.2, social aspect to be 5.8)
Návaznosti výsledku
Projekt
<a href="/cs/project/TA01010632" target="_blank" >TA01010632: SCADA systém pro řízení a monitorování procesů v reálném čase.</a><br>
Návaznosti
Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2013
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
3rd Eastern European Regional Conference on the Engineering of Computer-Based Systems
ISBN
978-0-7695-3759-7
ISSN
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e-ISSN
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Počet stran výsledku
2
Strana od-do
10-12
Název nakladatele
IEEE Computer Society
Místo vydání
New York
Místo konání akce
Budapest
Datum konání akce
29. 8. 2013
Typ akce podle státní příslušnosti
EUR - Evropská akce
Kód UT WoS článku
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