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Time synchronization is the necessary technique to implement automation system in smart substations. It provides the accuracy time stamp mark used for data acquisition and used to analyze and deal with the power system fault. As a type of clock synchronization used in network with high precision, IEEE1588 is widespread applied recently in smart substations. This paper analyzes the reason of clock...
IEEE1588 is a Precise Time Protocol (PTP), which is of potentially wide application in control and measurement networks. Stamping PTP messages accurately in physical layer taking advantage of hardware circuits, it is one of important key technologies to achieve the object of high precision time synchronization of IEEE1588. This paper analyzes the content of IEEE1588 standard in detail, and proposes...
The synchronization is a key point in measurement and control systems, which use technologies such as network communication, local computing and distributed objects. Modern industrial application is demanding the synchronization for higher precision, this paper analyzes a variety of synchronous time synchronization protocols used in the current industrial Ethernet applications, mean-while explains...
The successful operation of Networked Control Systems (NCS) requires employing appropriate approaches for dealing with network induced time delays, i.e. time intervals elapsed from consecutive sampling and actuation operations. Effective approaches often require to impose periodic execution for the sampling and/or actuation operations, enforcing synchronized constant time delays. And considering that...
Between the wired and the wireless world a synchronization gap in terms of accuracy obviously exists due to the different possibilities of the technologies. This paper investigates means to access WLAN functionality in order to gain system-wide synchronization between access points and clients in order to establish a common notion of time in IEEE 802.11 systems. For this, a novel approach is presented,...
Using IEEE 1588 for highly accurate clock synchronization between nodes of a distributed system has become a widely accepted approach. IEEE 802.3/Ethernet is frequently utilized as communication layer to exchange the Precision Time Protocol (PTP) messages specified in the IEEE 1588 standard. 10/100/1000 MBit Ethernet communication is commonly used by now. In contrast, fiber optics based 10 GBit Ethernet...
When using network synchronization protocols like IEEE 1588 or NTP, a common approach to increase the performance is to add hardware support for timestamping the essential synchronization messages. Further, timestamping accuracy and the stability of the local oscillator of a network synchronized node are the two main influence factors for high accuracy clock synchronization. While the latter is subject...
Wireless sensor networks are a nascent type of ad-hoc networks that had drawn the interest of the research community in last few years. They require working together for distributed tasks. Accurate and reliable time is one of the needs for some of its applications. The use of traditional time synchronization protocols for wired network is restricted by severe energy constraint in sensor network. The...
We present a distributed clock synchronization algorithm that guarantees an exponentially improved bound of O(log D) on the clock skew between neighboring nodes in any graph G of diameter D. In light of the lower bound of Omega(log D/ log log D), this result is almost tight. Moreover, the global clock skew between any two nodes, particularly nodes that are not directly connected, is bounded by O(D),...
Version 2 of IEEE 1588 contains an extension to secure the given service of clock synchronization. This article describes a practical implementation of this extension for a clock synchronization network. Pitfalls also relevant to other implementations and important properties are discussed and performance results that cover normal operation and stress tests such as denial of service attacks are presented...
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