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The problem addressed in this paper is the limitation imposed by network elements, especially Ethernet elements, on the real-time performance of timecritical systems. Most current network elements are concerned only with data integrity, connection, and throughput with no mechanism for enforcing temporal semantics. Existing safety-critical applications and other applications in industry require varying...
With the development of digitization of substation, the future trend of on-line monitoring system of substation power equipment is adopting the IEC61850 standard to realize seamless communication. However, the change of distance and node make synchronization precission of samples transmission become a problem. An implementation method based on the IEEE1588 standard is proposed, by use of DP83640 Ethernet...
Many large industrials operate internal co-generation systems to provide a substantial portion of their own power as well as to use the resulting output heat as part of their industrial process. Depending on the amount of co-generation, on loss of connection to the main grid or instability of the grid, these industrials may have the option of supplying all internal electrical loads from the co-generation...
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...
The IEEE 1588 standard is widely established and accepted for clock synchronization in Ethernet networks. High accuracy IEEE 1588 implementations require a well-coordinated hardware/software co-design. Processing of sophisticated control algorithms for the time speed of local clocks within synchronization slaves are particularly important. Hence, IEEE 1588 implementations should be tested with respect...
The key point of the existing Ethernet test and measurement is that the method needs to achieve precision clock synchronization between different terminals. In this paper, an improved method was proposed with consideration of the time drift and propagation delay, expressing master-slave synchronization as a linear relationship and inducting the line of least squares fitting algorithm that traded as...
It requires accurate synchronization among the MCU, servo controllers and sensors in CNC systems for time stamping of data and motion control. This paper presents the design and implementation of time synchronization for CNC systems which employ switched Ethernet as its communication module. The method adopts the clock of switches as the master clock instead of that of MCU which usual is. To obtain...
This paper focuses on the synchronization between master clock and slave clock in the Distributed clock of EtherCAT. It supports very accurate synchronization function which let local slaves follow reference time under the degree of few nano second differences. However, there exists the propagation delay between reference clock and slave clock. To remove the delay, EtherCAT uses the static compensation...
Hardware-timestamping is essential for achieving tight synchronization in networking applications. This mechanism is selectively used on few high-cost tailored systems. Actual muP-based implementations fail on deterministic timestamp retrieval and insertion inside the message. This problem degrades significantly the synchronization between network nodes. This paper describes the analysis, implementation,...
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...
We report the development and testing of an IEEE 1588 precision timing protocol link for an undersea network application. The system provides clock synchronization between a dry-end Global Positioning system (GPS) timing receiver (a 1588 grandmaster clock) and multiple wet-end nodes (1588 clients or slaves) for the purpose of synchronized data acquisition, control, and data time stamps. The system...
This paper discusses a device, the spider transparent clock, which can be used to retrofit existing bridges and routers to allow them to deliver highly accurate time using the IEEE 1588 protocol. The spider transparent clock corrects for the internal queuing jitter and asymmetry introduced by these bridges and routers.
This paper describes clock synchronization requirements for a modern military and crisis management sensor network. This paper also presents a network architecture utilizing IEEE 1588 implemented for sensor network use and some solutions selected to complete the special requirements. The requirements for the sensor network presented in the paper relate to clock synchronization accuracy, availability...
In the three years since the introduction of the LXI specification, test system designers have quickly embraced the technology and have rapidly integrated the platform into new and existing system designs. Instrument manufacturers are motivated to satisfy the initial demand for LXI-based products as quickly as possible. The result has been an influx of instruments that meet the minimum Class C requirements...
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