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2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication最新文献

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Achieving precise coordinated cluster time in a cluster environment 在集群环境中实现精确协调的集群时间
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659213
S. Froehlich, M. Hack, Xiaoqiao Meng, Li Zhang
{"title":"Achieving precise coordinated cluster time in a cluster environment","authors":"S. Froehlich, M. Hack, Xiaoqiao Meng, Li Zhang","doi":"10.1109/ISPCS.2008.4659213","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659213","url":null,"abstract":"A time-keeping mechanism is proposed for providing microsecond-level consistent time across a cluster of computers. The proposed mechanism is based on a new clock steering algorithm that uses piecewise linear mapping to align a local clock to an external reference clock in a smooth manner. We present two realizations of the algorithm: one is based on pulse-per-second (PPS) and the other is based on low-latency timing message exchange. The time derived by the proposed mechanism is called CCT (coordinated cluster time). It has a well-defined interface such that it can be used by applications with little overhead. Moreover, the interface deals completely with leap second issues. We implemented CCT on IBM BladeCenters and compared it to NTP. Experimental results demonstrate that the proposed mechanism achieves one microsecond precision.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117021926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Spider transparent clock 蜘蛛透明钟
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659204
J. Eidson, Andrew Fernandez, Bruce Hamilton, Jad Naous, Dieter Vook
{"title":"Spider transparent clock","authors":"J. Eidson, Andrew Fernandez, Bruce Hamilton, Jad Naous, Dieter Vook","doi":"10.1109/ISPCS.2008.4659204","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659204","url":null,"abstract":"This paper discusses a device, the spider transparent clock, which can be used to retrofit existing bridges and routers to allow them to deliver highly accurate time using the IEEE 1588 protocol. The spider transparent clock corrects for the internal queuing jitter and asymmetry introduced by these bridges and routers.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124139984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Navy shipboard time synchronization service options and analysis 海军舰载时间同步服务选项和分析
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659222
M.E. Glass, K. O'Donoghue
{"title":"Navy shipboard time synchronization service options and analysis","authors":"M.E. Glass, K. O'Donoghue","doi":"10.1109/ISPCS.2008.4659222","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659222","url":null,"abstract":"Next generation Navy platform designs are evolving towards generalized multipurpose infrastructures based on open standards and commercial products. These platforms will support a wide range of new and expanding applications in a more flexible and dynamic manner than in previous designs. These applications are increasingly being more finely partitioned and distributed over this generalized infrastructure with defined open interfaces. This new paradigm creates significant time synchronization challenges. Time sensitive applications that have previously been implemented in a single computer are now distributed across multiple computers over a network. IEEE 1588 (also known as PTP) has been identified as a potential open standards-based technology utilizing existing infrastructure to meet these requirements. This paper discusses next generation Navy shipboard infrastructures, emerging Navy applicationpsilas time service requirements, results from preliminary experiments, and future directions in design, test, and evaluation in support of next generation Navy network time synchronization requirements.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117084089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Master failures in the Precision Time Protocol 精确时间协议的主故障
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659214
G. Gaderer, S. Rinaldi, N. Kero
{"title":"Master failures in the Precision Time Protocol","authors":"G. Gaderer, S. Rinaldi, N. Kero","doi":"10.1109/ISPCS.2008.4659214","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659214","url":null,"abstract":"If all clocks within a distributed system share the same notion of time, the application domain can gain several advantages. Among those is the possibility to implement real-time behavior, accurate time stamping, and event detection. However, with the wide spread application of clock synchronization another topic has to be taken into consideration: the fault tolerance. The well known clock synchronization protocol IEEE1588 (precision time protocol, PTP), is based on a master/slave principle, which has one severe disadvantage. This disadvantage is the fact that the failure of a master automatically requires the re-election of a new master. The start of a master election based on timeout and thus takes a certain time span during which the clocks are not synchronized and thus running freely. Moreover the usage of a new master also requires new delay measurements, which prolong the time of uncertainty as well. This paper analyzes the results of such a master failure and proposes democratic master groups instead of hot-stand-by masters to overcome this problem by. It is shown by means of simulation that the proposed solution will not deteriorate the accuracy of the slave clocks in case of a master failure.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114351036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
Synchronizing PTPv1 and PVPv2 clients with one common time source 使用一个公共时间源同步PTPv1和PVPv2客户端
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659203
H. Gerstung
{"title":"Synchronizing PTPv1 and PVPv2 clients with one common time source","authors":"H. Gerstung","doi":"10.1109/ISPCS.2008.4659203","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659203","url":null,"abstract":"Since the release of the first version of IEEE 1588 in 2002 a significant number of vendors released V1 compliant devices to the market. Since V1 compliant devices can be negatively affected by V2 compliant devices when they are operating in the same network segment, a scheme for synchronizing both V1 and V2 devices based on the same time source is required in order to allow end users to smoothly migrate to V2 while maintaining a common timebase among all their devices. The LXI Consortium, maintainer of the LXI (LAN eXtensions for Instrumentation) Standard for Test & Measurement designed a possible solution which requires a grandmaster clock with two separate network ports, one operating as a V1 and one as a V2 compliant grandmaster. This paper describes the implementation of such a device and the test setup that was used at the LXI Plug-fest in Toronto, Canada. The plug-fest was part of the LXI General Meeting which was hosted by Testforce Systems from May 20th to May 23rd, 2008.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116017585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Time synchronization successes and challenges in the semiconductor industry 半导体行业时间同步的成功与挑战
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659218
G. Crispieri
{"title":"Time synchronization successes and challenges in the semiconductor industry","authors":"G. Crispieri","doi":"10.1109/ISPCS.2008.4659218","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659218","url":null,"abstract":"Timestamping is critical when gathering information that can be used to respond to problems in the factory. ISMI has been driving data quality guidelines and standards for time synchronization with the purpose of improving data collection and decision-making during manufacturing. These activities have led to the publication of multiple guideline documents, a SEMI standard, and a guide document. In parallel, two independent equipment software implementations provided important lessons learned and helped amend the standards and the guidelines.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115342589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Software-only implementations of slave clocks with sub-microsecond accuracy 具有亚微秒精度的从时钟的纯软件实现
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659206
A. Machizawa, T. Iwawma, H. Toriyama
{"title":"Software-only implementations of slave clocks with sub-microsecond accuracy","authors":"A. Machizawa, T. Iwawma, H. Toriyama","doi":"10.1109/ISPCS.2008.4659206","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659206","url":null,"abstract":"Keeping slave clocks with sub-microsecond accuracy is believed to require hardware-assistance at physical layer and network. This paper presents software-only implementations of a slave for such accuracy. Time-stamps are read in the interrupt handler and a system resource conflicts detector filters out system-inside noise. We adopted Packet Inter-Arrival based clock servo technique that has fast convergence and high resistance to network queuing delay. The slave keeps time within one microsecond up to 80% of link utilization by cross traffic with dumb switching hubs. The precision of the software time-stamping is 17 ns and the synchronization accuracy is 76 ns.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127068583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Evaluation of clock synchronization accuracy of coexistent Real-Time Ethernet protocols 共存实时以太网协议的时钟同步精度评价
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659219
P. Ferrari, A. Flammini, S. Rinaldi, G. Gaderer
{"title":"Evaluation of clock synchronization accuracy of coexistent Real-Time Ethernet protocols","authors":"P. Ferrari, A. Flammini, S. Rinaldi, G. Gaderer","doi":"10.1109/ISPCS.2008.4659219","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659219","url":null,"abstract":"This paper investigates Real-Time Ethernet (RTE) protocols for industrial applications and their clock synchronization performance. In fact, if different RTE protocols coexist on the same network sharing the same infrastructure, clock synchronization capabilities can be affected. This paper introduces a simulation environment to evaluate coexistence of RTE protocols. The proposed tool is described and validated by comparison with measurement data taken from real networks. Finally, simulation results are presented: the behavior of Ethernet/IP with IEEE1588-PTP, when it is transported over an isochronous PROFINET IO network, is shown and some improvements to the PTP tracking algorithms to ease coexistence are proposed.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130829162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
1μs-conform line length of the Transparent Clock Mechanism defined by the Precision Time Protocol (PTP Version 2) 精确时间协议(PTP Version 2)定义的透明时钟机制的1μs-符合线长
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659220
R. Scheiterer, Chongning Na, D. Obradovic, G. Steindl, Franz-Josef Goetz
{"title":"1μs-conform line length of the Transparent Clock Mechanism defined by the Precision Time Protocol (PTP Version 2)","authors":"R. Scheiterer, Chongning Na, D. Obradovic, G. Steindl, Franz-Josef Goetz","doi":"10.1109/ISPCS.2008.4659220","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659220","url":null,"abstract":"This paper quantifies the ldquo1 mus-conformrdquo line-length of the Transparent Clock Mechanism of peer-to-peer Precision Time Protocol (PTP Version 2), i.e. the number of elements that stay within the plusmn1 mus sync error tolerance, for crystal oscillator output frequencies of 100 MHz, 250 MHz, 500 MHz and 1 GHz, i.e. for time quantization errors of 10 ns, 4 ns, 2 ns and 1 ns.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117174123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Non invasive time synchronization for ZigBee Wireless Sensor Networks ZigBee无线传感器网络的非侵入式时间同步
2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication Pub Date : 2008-10-24 DOI: 10.1109/ISPCS.2008.4659225
P. Ferrari, A. Flammini, D. Marioli, E. Sisinni, A. Taroni
{"title":"Non invasive time synchronization for ZigBee Wireless Sensor Networks","authors":"P. Ferrari, A. Flammini, D. Marioli, E. Sisinni, A. Taroni","doi":"10.1109/ISPCS.2008.4659225","DOIUrl":"https://doi.org/10.1109/ISPCS.2008.4659225","url":null,"abstract":"A precise time synchronization is essential in many wireless sensor networking applications, e.g. in order to correlate observations of the same event from different sites or to efficiently share the wireless channel. Generally, wireless sensors are designed having in mind low cost and low power. In the past, several protocols have been suggested, each one with its pros and cons, aiming at the maximization of the accuracy vs. consumption ratio. However, their performance have been generally tested on particular hardware setup and with proprietary communication protocols. In this paper we present a non invasive implementation of a synchronization protocol over a full ZigBee-compliant platform. Experimental evaluation on real prototypes has been performed in order to ensure feasibility and verify performances. Our approach preserves compatibility with this emerging standard still offering synchronization error on the order of few mus if synchronization procedure is executed every 4 s.","PeriodicalId":428276,"journal":{"name":"2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125630476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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