Highly accurate time synchronization over switched Ethernet

Skeie, Tor; Johannessen, S.; Holmeide, Ø.

doi:10.1109/etfa.2001.996369

Cited by 24 publications

(16 citation statements)

References 11 publications

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“…In a typical LAN configuration, p = 0 and q = 2 are adequate values of the algorithm's parameters, providing a local clock accuracy of 1 μs, which is among the better results reported for hardwareassisted SNTP implementation (1-25 μs) [4], and largely improving the better results of the software NTP implementation (tens to a few hundreds of microseconds) [11], [12].…”

Section: Resultsmentioning

confidence: 99%

“…Assuming that, at time t i−1 , the offset is θ i−1 and D is D i−1 and that, at time t i , the offset is θ i (point B), a new value of D (D i ) should be calculated in order to cancel the drifting (Δθ B ). The correction ΔD i applied to D (2) is divided into two components according to (3) First, the correction needed to stop the drifting (ΔD 0 i ) can be calculated according to (4). With this correction, the offset is expected to stay constant after a new interval (point P in Fig.…”

Section: A Correction Calculationmentioning

confidence: 99%

“…Typical examples are distributed measurement and control systems [1] and the synchronized phasors (synchrophasors) applied to power distribution networks [2], [3]. In these systems, measurement and control equipment is synchronized using specific protocols through the communication network itself, which is usually a switched Ethernet network [4]. Time synchronization over Ethernet networks uses two primary synchronization protocols.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fast-Convergence Microsecond-Accurate Clock Discipline Algorithm for Hardware Implementation

Viejo

Juan

Bellido

et al. 2011

IEEE Trans. Instrum. Meas.

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Abstract-Discrete microprocessor-based equipment is a typical synchronization system on the market which implements the most critical features of the synchronization protocols in hardware and the synchronization algorithms in software. In this paper, a new clock discipline algorithm for hardware implementation is presented, allowing for full hardware implementation of synchronization systems. Measurements on field-programmable gate array prototypes show a fast convergence time (below 10 s) and a high accuracy (1 µs) for typical configuration parameters.

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Section: Resultsmentioning

confidence: 99%

Section: A Correction Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fast-Convergence Microsecond-Accurate Clock Discipline Algorithm for Hardware Implementation

Viejo

Juan

Bellido

et al. 2011

IEEE Trans. Instrum. Meas.

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show abstract

“…These clocks are frequency synchronized since the same time (249 tu) elapsed on both clocks. By having a common/public reference, it is possible to synchronize many clocks [10], [11], [12], [14].…”

Section: Timestampsmentioning

confidence: 99%

Application Level Measurement

Arlos

2011

Network Performance Engineering

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Abstract. In some cases, application-level measurements can be the only way for an application to get an understanding about the performance offered by the underlying network(s). It can also be that an application-level measurement is the only practical solution to verify the availability of a particular service. Hence, as more and more applications perform measurements of various networks; be that fixed or mobile, it is crucial to understand the context in which the application level measurements operate their capabilities and limitations. To this end in this paper we discuss some of the fundamentals of computer network performance measurements and in particular the key aspects to consider when using application level measurements to estimate network performance properties.

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“…Ref. [11] shows that time synchronization in a wired network is possible, but will require additional hardware and system reconfiguration. In the best case, the time difference achievable can be better than 1 µs.…”

Section: A Connectivitymentioning

confidence: 99%

Dense RFID Reader Deployment in Europe using Synchronization

Leong¹,

Ng²,

Grasso³

et al. 2006

JCM

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Abstract-For a dense RFID reader deployment, such as in a warehouse, where hundreds of readers will be positioned in a building, the interference between all these readers must be studied carefully to avoid disruption of operations. Strict RFID regulations and standards have been imposed, trying to address the problem of reader collision and also the problem of RFID devices interfering with other devices operating in the same and nearby frequency bands. However, these guidelines and regulations are not entirely friendly for dense RFID reader deployment; in some cases it is not possible to have a feasible RFID system while adhering to these regulations. Hence, this paper proposes the synchronization of RFID readers to enable successful dense RFID reader deployment. A case study targeted at European operations is presented in this paper to illustrate the actual synchronization of RFID readers in real applications. Some fine-tuning methods are also suggested to further improve the performance of readers in a high reader density population area.

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Highly accurate time synchronization over switched Ethernet

Cited by 24 publications

References 11 publications

Fast-Convergence Microsecond-Accurate Clock Discipline Algorithm for Hardware Implementation

Fast-Convergence Microsecond-Accurate Clock Discipline Algorithm for Hardware Implementation

Application Level Measurement

Dense RFID Reader Deployment in Europe using Synchronization

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