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Today, local data networks, many last-mile access networks and even some backbone networks are based on packet transmission protocols, especially the Ethernet. Generally, there are several protocols and standards, which could be used for the purpose of clock distribution (synchronization) over packet networks. One of the most accurate protocols is Precision Clock Synchronization Protocol (PTP, IEEE...
There is an increasing demand on accurate time synchronization for protection and control equipment for the electrical power supply system. Today, with the proliferation of Ethernet networks in the substation automation systems, mainly driven by other standards as IEC 61850, time distribution over these networks appears to be especially appealing. NTP was already specified in IEC 61850 as time distribution...
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...
The IEEE 1588-2008 Precision Time Protocol (PTP) defined in 2008 opens the possibilities to define profiles for specific application areas. The profiles for power system application and audio/video streaming have an importance beyond their initial application domain and may have to cohabit in the near future. As an example, the smart grid initiative taking place in the power system community will...
This paper investigates the possibility of using the PTP (Precision Time Protocol) defined in the Standard IEEE 1588 for applications in electric power system, with reference to one of the most challenging measurement problems, i.e. the measurement of synchrophasors. The proposed approach refers to situations in which many measurement devices, connected to each other by suitable communication links,...
IP networks allow constructing versatile device configurations for multimedia streaming. However, the stochastic nature of the packet-switched data transmission may complicate IP-based implementations of some conventional applications such as analog wired transmission of synchronized multi-channel audio. This paper introduces a multimedia streaming system based on the synchronization of multiple playback...
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...
The IEEE 1588 precision time protocol seems to be a promising way to handle synchronization requirements of tomorrow substation automation. However, one of the remaining issues is its lack of reliability in case of the loss of the GPS signal (e.g. due to atmospheric disturbances or failure of the GPS antenna) which would lead to the desynchronization of the devices inside a substation or between different...
If all clocks within a distributed system share the same notion of time, the application domain can gain several advantages. Among those is the possibility to implement real-time behavior, accurate time stamping, and event detection. However, with the wide spread application of clock synchronization another topic has to be taken into consideration: the fault tolerance. The well known clock synchronization...
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...
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...
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