2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)最新文献

Improving PTP robustness to the byzantine failure 提高PTP对拜占庭故障的鲁棒性

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324693

M. Dalmas, H. Rachadel, Gustavo Silvano, C. Dutra

引用次数: 10

Automatic determination of synchronization path quality using PTP bridges with integrated inaccuracy estimation for system configuration and monitoring 利用PTP桥自动确定同步路径质量，并对系统配置和监控进行综合误差估计

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324683

S. Schriegel, Alexander Biendarra, Opher Ronen, Holger Flatt, Gunnar Lessmann, J. Jasperneite

{"title":"Automatic determination of synchronization path quality using PTP bridges with integrated inaccuracy estimation for system configuration and monitoring","authors":"S. Schriegel, Alexander Biendarra, Opher Ronen, Holger Flatt, Gunnar Lessmann, J. Jasperneite","doi":"10.1109/ISPCS.2015.7324683","DOIUrl":"https://doi.org/10.1109/ISPCS.2015.7324683","url":null,"abstract":"Many network applications like motion control or precise monitoring of machines need precise knowledge about the time synchronization accuracy. But time synchronization accuracy depends on the performance of PTP nodes, network topology, environmental conditions and various other factors. This makes the determination of synchronization accuracy a complex task. A mechanism for determining the worst case synchronization accuracy is defined in the PTP Power Profile. A TLV is used for accumulating a vendor defined worst case inaccuracy. However in practice when using this approach the inaccuracy values are often much higher than the real synchronization accuracy. In this paper, a technique for automatic determination of synchronization path quality is investigated. It utilizes PTP Bridges with an inaccuracy estimation performed using an inaccuracy model that is separated into static and dynamic inaccuracy contributors. One assumption is that the inaccuracy in the PTP time observed by a bridge, depends on the position of the bridge in the sync path. The latter is due to accumulation of more, possibly independent, random contributors. The effect of increasing deviation is modeled and verified using an experimental setup. The paper concludes that detailed knowledge about the PTP network (cable lengths, inaccuracy contribution metrics for the specific nodes within the sync path, etc.) are useful for automatic determination of the synchronization path quality, synchronization monitoring, system configuration and diagnosis. We suggest an enhancement to the TimeInaccuracy TLV that may possibly be incorporated within the next PTP revision, to better facilitate the protocol support for the above functions.","PeriodicalId":159620,"journal":{"name":"2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124244887","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: 7

Partial OFDM demodulation for frequency syntonization of Wireless Sensor Nodes 无线传感器节点频率同步的部分OFDM解调

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324671

H. Troger, J. Robert, Martin Keppeler, M. Hartmann, A. Heuberger

引用次数: 4

Data processing and synchronization of the digital backend for FAST FAST数字后端的数据处理与同步

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324679

Yu Xinying, Z. Xia, Duan Ran, Li Di, Hao Jie

引用次数: 0

Synchronization robustness using Kalman-based clock servos 基于卡尔曼时钟伺服的同步鲁棒性

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324685

F. Ring, Thomas Bigler, R. Exel

引用次数: 6

Time looping in IEEE 1588v2: Analysis and solution proposal IEEE 1588v2中的时间循环:分析与解决方案

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324682

Guangquan Wang, He Zhang, Xin Liu

引用次数: 0

Time synchronization for real-time control systems without PTP-enabled switches 无ptp开关的实时控制系统的时间同步

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324686

T. Maruyama, Tsutomu Yamada, S. Yoshida, Mitsuyasu Kido, Chikashi Komatsu

{"title":"Time synchronization for real-time control systems without PTP-enabled switches","authors":"T. Maruyama, Tsutomu Yamada, S. Yoshida, Mitsuyasu Kido, Chikashi Komatsu","doi":"10.1109/ISPCS.2015.7324686","DOIUrl":"https://doi.org/10.1109/ISPCS.2015.7324686","url":null,"abstract":"IEEE 1588 is a promising way of time synchronization in control systems that include IT. Intermediate devices such as network switches are needed when the control systems are built on a multi-hop network for wide area operations. However, the introduction of switches causes conflicts between the reply packets from the devices in a switch, and thus, the delays on the backward and forward paths would be different and the synchronization accuracy is degraded as a result. On the other hand, it is difficult to build low cost control systems when using dedicated switches for the precision time protocol (i.e., boundary clock or transparent clock). Therefore, the authors propose a method that estimates the conflicts between synchronization packets based on the observable information by using the synchronization master device and applies the estimation to the synchronization method. We used communication evaluation board to create a prototype for the proposed method and then evaluated it. The results showed that the level of accuracy was ±1μs accuracy under five slaves and that there was a 2-msec cyclic time synchronization.","PeriodicalId":159620,"journal":{"name":"2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859578","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

Improving IEEE 1588 synchronization accuracy in 1000BASE-T systems 提高IEEE 1588在1000BASE-T系统中的同步精度

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324684

R. Greenstreet, A. Zepeda

引用次数: 5

Security mechanisms to protect IEEE 1588 synchronization: State of the art and trends 保护IEEE 1588同步的安全机制:最新技术和趋势

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324694

Naiara Moreira, Jesús Lázaro, J. Jiménez, Mikel Idirin, A. Astarloa

引用次数: 22

Analysis of the dynamic time error in a chain of cascading telecom boundary clocks 级联电信边界时钟链动态时间误差分析

2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS) Pub Date : 2015-11-12 DOI: 10.1109/ISPCS.2015.7324692

S. Siu, Wen-Hung Tseng, C. Liao, Hsiu-fang Hu, Shinn-Yan Lin, Yi-Liang Lai

{"title":"Analysis of the dynamic time error in a chain of cascading telecom boundary clocks","authors":"S. Siu, Wen-Hung Tseng, C. Liao, Hsiu-fang Hu, Shinn-Yan Lin, Yi-Liang Lai","doi":"10.1109/ISPCS.2015.7324692","DOIUrl":"https://doi.org/10.1109/ISPCS.2015.7324692","url":null,"abstract":"Time quantization error is the major component of dynamic time error which is caused by the time stamping. Both the constant and dynamic time error components contribute to the time error in a network, which limits the number of clocks, cascaded in a chain. Due to complex network topologies and different network technologies, the limit on the number of intermediate supporting clocks may not meet all the requirements for future systems. In order to ensure a minimum time error, it is important also to keep the dynamic time error low. One of the effective ways is to employ higher timestamp resolutions. In this paper, we analyze the dynamic time error in cascaded homogenous Telecom boundary clocks. The upper bound of the dynamic time error accumulation at the output of the Telecom-time slave clock (T-TSC) node is derived for homogenous time clocks. The effect of timestamp resolution is theoretically discussed. The measurement results in a mobile backhaul network indicate that a high timestamp resolution (e.g., 500 MHz) outperforms the conventional timestamp resolution based on the timestamp frequency of 125 MHz.","PeriodicalId":159620,"journal":{"name":"2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129948124","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