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2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings最新文献

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Improved clock synchronization accuracy through optimized servo parametrization 通过优化伺服参数，提高时钟同步精度
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644765
R. Exel, F. Ring
{"title":"Improved clock synchronization accuracy through optimized servo parametrization","authors":"R. Exel, F. Ring","doi":"10.1109/ISPCS.2013.6644765","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644765","url":null,"abstract":"Slave servo clocks are of essential importance to maintain synchronization between the grandmaster and its associated slaves. The servo structure and parametrization should ideally achieve fast settling times, minimize the clock jitter, and keep the clock offset below a predefined boundary. Commonly used solutions for this challenge are adder-based clocks or voltage controlled oscillators together with proportional-integral (PI) controllers. This paper shows how to capture and calculate the impairments relevant for the servo clocks, in particular the oscillator wander. Based on these data we show that proper parametrization of the PI controller is the key for minimizing the clock offset to the grandmaster.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126743970","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: 25
Time of arrival estimation in power line communication systems for home smart grids 家用智能电网电力线通信系统的到达时间估计
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644768
P. Ferrari, A. Flammini, S. Rinaldi, M. Rizzi, E. Sisinni
{"title":"Time of arrival estimation in power line communication systems for home smart grids","authors":"P. Ferrari, A. Flammini, S. Rinaldi, M. Rizzi, E. Sisinni","doi":"10.1109/ISPCS.2013.6644768","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644768","url":null,"abstract":"This paper deals with time synchronization of devices attached to a smart grid, whose accuracy tightly depends on the accurate estimation of the Time of Arrival (ToA) of the synchronization related messages sent over the power line communication systems. Usually smart grids are quite complex “systems of heterogeneous systems”: the aim of this paper is to suggest a ToA detection mechanism that can use to forward time synchronization to the “last mile” link and inside the end user home. In particular in this paper, the use of a chirp-based preamble, borrowed from wireless communications (which suffer from multipath and noise like in power line communication) is proposed and tested by means of simulations and real experiments with narrowband PRIME technology. The results show very interesting performance even with narrowband chirps: the standard deviation of the ToA estimation is always in the order of 150 ns, even with loaded electrical grids.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128255502","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
Deploying PTP as an Enterprise Service: Issues, challenges and design considerations 将PTP部署为企业服务:问题、挑战和设计考虑
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644767
Wojciech Owczarek
{"title":"Deploying PTP as an Enterprise Service: Issues, challenges and design considerations","authors":"Wojciech Owczarek","doi":"10.1109/ISPCS.2013.6644767","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644767","url":null,"abstract":"This paper presents an industry experience and research-based analysis of issues that the deployment of PTP as a service is facing in the finance industry, based on real life examples from a global stock exchange operator. It aims to summarise over three years of author's experience with deploying PTP, highlighting the most common problems encountered: standard specific, implementation specific and non-technical. The paper attempts to define some best practices for achieving high resiliency and service quality levels combined with ease of operation, also touching on design considerations for scalable timing networks. Finally, it makes recommendations for the industry, standard, for vendors and service providers, and presents some novel design concepts for timing networks, contributing to the relatively small public knowledge base.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131579993","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
PTPv2-based network load estimation 基于ptpv2的网络负载估计
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644771
P. A. Frangoudis, A. Ksentini, Y. Hadjadj-Aoul, G. Boime
{"title":"PTPv2-based network load estimation","authors":"P. A. Frangoudis, A. Ksentini, Y. Hadjadj-Aoul, G. Boime","doi":"10.1109/ISPCS.2013.6644771","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644771","url":null,"abstract":"We make the case for utilizing the recently standardized IEEE 1588-2008 Precision Time Protocol (PTPv2) to achieve real-time, delay-based, network load estimation. We design and implement a load estimation service which builds upon our measurement-driven scheme for correlating path delay and network load, showing it to minimize estimation error to less than 11% for realistic traffic workloads. Such a service has multiple applications; we demonstrate how it can be utilized to achieve rate-adaptive delivery of multimedia content.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121436921","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
Timing information's 24×7 monitoring as an important factor of network synchronization quality support 定时信息的24×7监控作为网络同步质量支持的重要因素
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644769
G. Konovalov, B. Kostik, V. Koval, I. Shkliarevskyi
{"title":"Timing information's 24×7 monitoring as an important factor of network synchronization quality support","authors":"G. Konovalov, B. Kostik, V. Koval, I. Shkliarevskyi","doi":"10.1109/ISPCS.2013.6644769","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644769","url":null,"abstract":"Networks timing information's 24×7 wander monitoring solution, actual both for Telecom synchronization networks and for IEEE1588 based networks, including optimally controlled PLL desing is described in this article. It also mentions a cost effective SDH or SyncE signals' probe unit design, expanded MTIE/TDEV metrics, and some monitoring experience with non- trivial results concerning GPS related issues.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126671216","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
Synchronization monitoring in IEEE1588 synchronization networks IEEE1588同步网络中的同步监控
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644770
Opher Ronen
{"title":"Synchronization monitoring in IEEE1588 synchronization networks","authors":"Opher Ronen","doi":"10.1109/ISPCS.2013.6644770","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644770","url":null,"abstract":"The IEEE1588-2008 (precision time protocol, PTP) is being deployed in various application domains including domains requiring specified synchronization performance. Deploying appropriately defined monitoring functions will support the continuous operation of synchronization networks at the required synchronization quality. The paper addresses the field of synchronization monitoring, first introducing the relevant background. It shortly reviews synchronization quality performance criteria and possible measurement metrics. This is followed by a review and analysis of synchronization performance factors and possible failure points. Synchronization monitoring functions addressing the various factors are defined and shortly described. The paper elaborates in more detail on the packet delay variation monitoring and node performance monitoring functions. Finally, a possible extension to the PTP standard increasing and simplifying support for slave performance monitoring and testing is described.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"569 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123926207","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: 4
Out-of-band asymmetry removal for high accuracy clock synchronization in 100Base-TX 带外不对称去除在100Base-TX高精度时钟同步
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644759
Thomas Bigler, R. Exel
{"title":"Out-of-band asymmetry removal for high accuracy clock synchronization in 100Base-TX","authors":"Thomas Bigler, R. Exel","doi":"10.1109/ISPCS.2013.6644759","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644759","url":null,"abstract":"The IEEE 1588 standard enables accurate clock synchronization in a distributed network by synchronizing multiple slave clocks to one master. To reduce the synchronization offset, IEEE 1588 compensates for the propagation delay between master and slave by round-trip measurements and the assumption of known link asymmetries. Yet, the determination of the asymmetries is out of scope of the standard. Therefore, state-of-the-art implementations often neglect the presence of asymmetry which leads to a clock offset between master and slaves. In this paper we propose an asymmetry determination method for 100Base-TX using out-of-band Chirp Spread Spectrum signaling. In contrast to the round-trip measurements by IEEE 1588 event messages, the proposed solution is able to measure each individual link delay and is therefore capable of resolving the asymmetry. The practical feasibility of the proposed solution is shown by an FPGA-based prototype solution, which reveals that our approach enables sub-nanosecond synchronization even over (asymmetric) CAT5 cabling.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122701603","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: 1
Node to node synchronization accuracy requirements of Dynamic Frame Packing 动态框架装箱的节点间同步精度要求
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644763
M. Schumacher, Lukasz Wisniewski, J. Jasperneite, S. Schriegel
{"title":"Node to node synchronization accuracy requirements of Dynamic Frame Packing","authors":"M. Schumacher, Lukasz Wisniewski, J. Jasperneite, S. Schriegel","doi":"10.1109/ISPCS.2013.6644763","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644763","url":null,"abstract":"The evolution of industrial communication inexorably moves towards Ethernet based networks. One important reason for using Ethernet at the shop floor is to participate on the continuous advancements of standard Ethernet. In contradistinction to the star topology, used commonly in home and office networks, in the industrial automation most common network structure is line. It is due to the fact that it simply follows the architecture of plants (production line). Depending on the size of an automation facility the size of such a network structure may contain up to 100 nodes. Thus, the node to node synchronization jitter, with its cumulative behavior, becomes a relevant performance factor for high demanding applications such as motion control. This paper examines influence of the synchronization jitter on the industrial Ethernet networks by taking the example of PROFINET IO, a common representative of an industrial Ethernet based protocol. It uses a Time Division Multiple Access (TDMA) procedure together with the communication scheduling to fulfill hard real-time requirements. Additionally the protocol uses Dynamic Frame Packing (DFP) in order to optimize bandwidth utilization. The efficiency of both mechanisms strongly depends on the node to node synchronization accuracy.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123245280","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
Reliable synchronization accuracy in ieee 1588 networks using device qualification with standard test patterns 在ieee 1588网络中使用具有标准测试模式的设备认证的可靠同步精度
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-10-24 DOI: 10.1109/ISPCS.2013.6644772
Holger Flatt, S. Schriegel, J. Jasperneite
{"title":"Reliable synchronization accuracy in ieee 1588 networks using device qualification with standard test patterns","authors":"Holger Flatt, S. Schriegel, J. Jasperneite","doi":"10.1109/ISPCS.2013.6644772","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644772","url":null,"abstract":"This paper presents a device qualification approach for IEEE 1588 devices. Based on repetitive measurements within heterogeneous networks, standard stimulation data and device reaction values are defined for qualification of PTP bridges. According to these measurements, PTP bridges are classified into three classes basic, advanced, and high-performance. In order to execute the required device tests, a special IEEE 1588 Test Adapter is proposed, which operates as a hardware-in-the-loop tester. This Test Adapter, which is mapped onto a cost-efficient Altera Cyclone IV FPGA, is controlled by a standard PC and implements all time-critical PTP tasks in hardware. Within a case study, this Test Adapter is validated for analyzing and performance qualification of five exemplary PTP bridges. Overall, the proposed qualification approach in combination with the IEEE 1588 Test Adapter supports vendors and operators of PTP bridges to quantify the synchronization accuracy of a PTP bridge within a complex IEEE 1588 network without utilizing complex simulation models.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"461 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132508129","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: 8
Measurement of egress and ingress delays of PTP clocks PTP时钟输出和输入延迟的测量
2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings Pub Date : 2013-09-01 DOI: 10.1109/ISPCS.2013.6644773
C. Riesch, C. Marinescu, M. Rudigier
{"title":"Measurement of egress and ingress delays of PTP clocks","authors":"C. Riesch, C. Marinescu, M. Rudigier","doi":"10.1109/ISPCS.2013.6644773","DOIUrl":"https://doi.org/10.1109/ISPCS.2013.6644773","url":null,"abstract":"Distributed systems evolved to state-of-the-art solutions in many areas, like test, measurement and automation control systems. The protocol defined by the IEEE 1588 standard was designed to achieve clock synchronization among the different components of a distributed system using an unreliable communication network. Since any asymmetry between master and slave impacts the synchronization accuracy, PTP software has to compensate such asymmetries as much as possible. Our paper studies the effects of the hardware propagation delays on the synchronization. We present a setup that allows the direct measurement of these time delays and show results for a PTP clock that is generating the timestamps in the PHY and for a second one that is creating them on a MAC level. We discuss the characteristics of the time delays, and demonstrate the feasibility of the setup by using the measured compensation values in a synchronization experiment.","PeriodicalId":260403,"journal":{"name":"2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceedings","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116189084","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: 4
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