Download or read book Clock synchronization in distributed systems a comparison written by Harald Bachner and published by GRIN Verlag. This book was released on 2007-03-01 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bachelor Thesis from the year 2007 in the subject Computer Science - Technical Computer Science, grade: 1,0, University of Applied Sciences Technikum Vienna (Informations- und Kommunikationssysteme), language: English, abstract: Clock synchronization is a necessary and critical part in most distributed systems. For many years NTP was the state-of-the-art way of synchronizing computer clocks distributed in space. However, as recent advances in miniaturization lead to the construction of smaller, more powerful and less power consuming computers, embedded devices, sensors and actuators, the need for more precise time synchronization grew. This work thus sets out to compare selected approaches to clock synchronization in distributed systems. The well known Global Positioning System is disseminating accurate time and frequency information from the International Institutes that keep the time, NTP can still do the same, but at different levels of accuracy as well as cost. Clock synchronization protocols like IEEE1588 or TTP and bus architectures like FlexRay evolved from the need to further propagate the timing information within small networks and therefore staying within the specified limits of preciseness.
Download or read book Clock Synchronization in Distributed Systems a Comparison written by Harald Bachner and published by GRIN Verlag. This book was released on 2007-07-26 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bachelor Thesis from the year 2007 in the subject Computer Science - Technical Computer Science, grade: 1,0, University of Applied Sciences Technikum Vienna (Informations- und Kommunikationssysteme), 29 entries in the bibliography, language: English, abstract: Clock synchronization is a necessary and critical part in most distributed systems. For many years NTP was the state-of-the-art way of synchronizing computer clocks distributed in space. However, as recent advances in miniaturization lead to the construction of smaller, more powerful and less power consuming computers, embedded devices, sensors and actuators, the need for more precise time synchronization grew. This work thus sets out to compare selected approaches to clock synchronization in distributed systems. The well known Global Positioning System is disseminating accurate time and frequency information from the International Institutes that keep the time, NTP can still do the same, but at different levels of accuracy as well as cost. Clock synchronization protocols like IEEE1588 or TTP and bus architectures like FlexRay evolved from the need to further propagate the timing information within small networks and therefore staying within the specified limits of preciseness.
Download or read book Clock Synchronization and Comparison written by James E. Gray and published by . This book was released on 1976 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clock Synchronization and Comparison written by James E. Gray and published by . This book was released on 1976 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clock Synchronization and Comparison written by James E Gray and published by Forgotten Books. This book was released on 2018-03-20 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Clock Synchronization and Comparison: Problem, Techniques and Hardware This report summarizes a lecture-discussion of practical problems in measurement electronics as experienced in a laboratory for precise timekeeping. It includes environmental problems, instrumentation problems, procedural problems and ends with a description of a convenient automatic measuring instrument, the chronograph. Key words: Chronograph; frequency - stability measurement; instrumentation; laboratory technique: time measurement.. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book A Comparison of Intercontinental Clock Synchronization by VLBI and the NTS Satellite written by James A. Buisson and published by . This book was released on 1980 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intercontinental clock synchronization capabilities of Very Long Baseline Interferometry (VLBI) and the Navigation Technology Satellite (NTS) have been compared at the NASA Deep Space Net complexes at Madrid, Spain and Goldstone, California. The VLBI experiments used the Wideband VLBI Data Acquisition System developed at the NASA Jet Propulsion Laboratory. The Naval Research Laboratory NTS Satellites were used with NTS Time Transfer Receivers developed by the Goddard Space Flight Center. The two methods agreed to within about 0.5 microseconds. (Author).
Download or read book Digital Clocks for Synchronization and Communications written by Masami Kihara and published by Artech House. This book was released on 2006 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you need an in-depth understanding of the digital clock technologies used in building today's telecommunications networks, this authoritative and practical book is a smart choice. Providing you with critical details on the PLL (phase-locked Loop) technique for clock synchronization and generation, and the DDS (direct digital synthesizer) technique for clock generation, the book helps you achieve synchronization in high-speed networks and frequency stabilization in portable equipment.
Download or read book The Accuracy of the Clock Synchronization Achieved by TEMPO in Berkeley UNIX 4 3BSD written by Riccardo Gusella and published by . This book was released on 1987 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT:: This paper discusses the upper and lower bounds on the accuracy of the time synchronization achieved by the algorithms implemented in TEMPO, a distributed clock synchronizer running on Berkleley UNIX 4.3BSD systems. We show that the accuracy is a function of the network transmission latency, and depends linearly upon the drift rate of the clocks and the interval between synchronizations. Comparisons with other clock synchronization algorithms reveals that This paper discusses the upper and lower bounds on the accuracy of the time synchronization achieved by the algorithms implemented in TEMPO, a distributed clock synchronizer running on Berkleley UNIX 4.3BSD systems. We show that the accuracy is a function of the network transmission latency, and depends linearly upon the drift rate of the clocks and the interval between synchronizations. Comparisons with other clock synchronization algorithms reveals that TEMPO may achieve better synchronizatio n accuracy at a lower cost.
Download or read book An Optimized Implementation of a Fault Tolerant Clock Synchronization Circuit written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fault-tolerant clock synchronization circuit was designed and tested. A comparison to a previous design and the procedure followed to achieve the current optimization are included. The report also includes a description of the system and the results of tests performed to study the synchronization and fault-tolerant characteristics of the implementation. Torres-Pomales, Wilfredo Langley Research Center RTOP 505-64-10-13...
Download or read book Standard Time and Frequency written by John B. Milton and published by . This book was released on 1972 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Time and Frequency Division of the National Bureau of Standards produces the NBS time scales, AT(NBS) and UTC(NBS).These time scales are developed by utilizing the properties of the NBS frequency standard, NBSFS.The main byproduct of these time scales is the operational clock systems.These operational clock systems are used, among other things, to calibrate the clocks and secondary standards necessary for the operation of the NBS radio stations, WWV, WWVB, WWVL, and WWVH.These stations transmit UTC(NBS), and various tones, alerts, and corrections for time-of-day information.(Author).
Download or read book Gravity s Time written by C. S. Unnikrishnan and published by CRC Press. This book was released on 2022-04-28 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is unique and exceptional in dealing with the notion of physical time rigorously, both logically and empirically. The central theme is the intimate relation between physical time and cosmic gravity. It establishes and explains, in an accessible manner, the one crucial physical fact that has been missed in the development of modern physics—that the enormous gravity of the matter and energy in the Universe is the controller and cause of the relativistic time. The material in the book is accurate and free of the ambiguities in the discussion of time and its modifications (dilation), synchronization of clocks, and simultaneity. The contents go beyond the current theories of relativity that fail to incorporate the cosmic gravity in their structure. The discussion of clocks in satellite navigational systems (like the GPS) is the most complete and accurate. The book offers several new insights, and it is the only available treatise on the complete physical truth about time. The contents are addressed to a wide range of readers, from general readers and students to experienced researchers, and will also appeal well to philosophers and historians of physics. This book has the enabling quality to deal with difficult questions about physical time, with unprecedented clarity and without paradoxes.
Download or read book A Survey of Provably Correct Fault Tolerant Clock Synchronization Techniques written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-29 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six provably correct fault-tolerant clock synchronization algorithms are examined. These algorithms are all presented in the same notation to permit easier comprehension and comparison. The advantages and disadvantages of the different techniques are examined and issues related to the implementation of these algorithms are discussed. The paper argues for the use of such algorithms in life-critical applications. Butler, Ricky W. Langley Research Center RTOP 505-66-21-01...
Download or read book NBS Technical Note written by and published by . This book was released on 1959 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Processing in Precise Time and Frequency Applications written by M. Desaintfuscien and published by Springer Science & Business Media. This book was released on 2007-05-24 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical processes, involving atomic phenomena, allow more and more precise time and frequency measurements. This progress is not possible without convenient processing of the respective raw data. This book describes the data processing at various levels: design of the time and frequency references, characterization of the time and frequency references, and applications involving precise time and/or frequency references.
Download or read book Frequency Standards and Metrology Proceedings of the 7Th Symposium written by Lute Maleki and published by World Scientific. This book was released on 2009-05-25 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Symposium on Frequency Standards and Metrology is an event held approximately every seven years, and is regarded as the premier conference in the field of advanced clocks and oscillators together with their applications in science and metrology. This series began with the first meeting at Universit(r) Laval, Quebec Canada in 1971, and the last one was held in 2001 at the University of St. Andrews, Scotland. The 7th Symposium on Frequency Standards and Metrology is scheduled for October 5OCo11, 2008 at the Asilomar Conference Grounds in Pacific Grove, California, USA. The Symposium is intended as a forum for bringing together international scientists and technologists engaged in the development of precise frequency standards and clocks, the study of their underlying physics, and their applications in metrology and tests of fundamental laws. The symposium has been traditionally held in a venue that promotes exchange of information on emerging ideas and latest achievements in the field, with a single-session approach which includes oral presentations by invitation, poster session(s) and keynote talks from internationally-recognized speakers. The program also includes social and other events aimed at promoting the exchange of technical and scientific information."
Download or read book Precision Measurement and Calibration Frequency and time B E Blair and A H Morgan editors written by United States. National Bureau of Standards and published by . This book was released on 1972 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frequency and Time written by B. E. Blair and published by . This book was released on 1972 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
