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High accurate time synchronization is very important for many applications and industrial environments. In a computer network, synchronization of time for connected devices is provided by the Precision Time Protocol (PTP), which in principal allows for device time synchronization down to microsecond level. However, PTP and network infrastructures are vulnerable to cyber-attacks, which can de-synchronize...
Wide-area monitoring (WAM) applications for power distribution rely on accurate global time synchronization. Furthermore, there is interest in replacing current time synchronization methods such as Inter Range Instrumentation Group (IRIG), with distributed time synchronization protocols that utilize the data communication lines eliminating the need for dedicated timing signals within the substation...
Assuring very accurate time synchronization across wide area industrial networks is still an open issue, which even the second version of the Precision Time Protocol (PTPv2) has not been able to solve completely. This is due to the accumulation of many uncertainty contributions when PTP event messages are routed from the master clock to the slave one through multiple network nodes. Peer-to-peer transparent...
In this paper we consider the problem of time synchronization in collaborative environments of robots and intelligent sensors. Due to its superior performance, the Precision Time Protocol (PTP) has been implemented and tested using various topologies of complex, multi-hop networks. Two distinct approaches have been studied. The first one uses boundary clocks, while the second uses a transparent clock...
Wireless sensor networks are evolving from relatively undemanding applications to applications which have stronger requirements. The coordination of distributed entities and events requires time synchronization. Although a number of methods have been studied for WSNs, some applications require high precision time synchronization. Precision time synchronization enables a variety of extensions of applications...
In order to improve the time synchronization precision to insure the communication timely, several types of clock synchronization methods were compared, analyzed the IEEE1588 clock synchronization system, discussed the PTP system software programming, introduced some source code transplanting methods, got the root cause of the low precision, provided three major improving methods, tested the improved...
Time synchronization is essential for a number of network applications. As the era of ubiquitous computing is ushered in, high precision time synchronization of nodes in wireless networks is required. High precision time synchronization can enable a variety of extensions of applications. This paper includes the design and implementation of the precision time protocol over low rate wireless personal...
Time and frequency alignment is critical for ensuring QoS for applications such as voice, real-time video, wireless hand-off, and data over a converged access medium. To satisfy the accuracy of time synchronization, propagation delay measurement is required between time-sensitive devices. There is existing network technology for time synchronization, such as network time protocol (NTP), IEEE 1588...
It is an important field of research to achieve precise time synchronization with precision time protocol in network. This paper mainly studies the kernel mechanism of synchronizing the clock between the host and slave devices with PTP, on which base the system is designed and realized through software simulation with the programming tool C#. The precision of synchronization reaches one millisecond...
IEEE 1588 is a standard to synchronize independent clocks running on separate nodes of a distributed measurement and control system. In IP based cellular network, it is considered as a key technology to synchronize base stations. Especially, interests for the low-cost and very-small home cellular base station called the Femtocell is increasing, and it is connected to the cellular core network using...
The IEEE 1588 standard specifies a protocol enabling precise synchronization of clocks in measurement and control systems implemented with technologies such as network communication, and distributed objects. The Unified Modeling Language (UML) is a powerful tool for object-oriented modeling, design, and development of complex distributed systems. This paper describes an object-oriented model for the...
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