Topic
Precision Time Protocol
About: Precision Time Protocol is a research topic. Over the lifetime, 604 publications have been published within this topic receiving 6006 citations. The topic is also known as: PTP & IEEE 1588.
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Papers
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02 Mar 2009TL;DR: In this article, a PTP client receives a time of day data and frequency information from the PTP server, receives a timing signal from the GPS, synchronizes the time-of-day data and timing signal, and provides the synchronized time-ofthe-day signal to the pseudowire device.
Abstract: A communication system for providing an accurate timing signal and synchronization information is described herein. The communication system comprises a Precision Time Protocol (PTP) server, a Global Positioning System (GPS), a pseudowire device, and a PTP client. The PTP client receives a time of day data and frequency information from the PTP server, receives a timing signal from the GPS, synchronizes the time of day data and timing signal to create synchronized a time of day signal, and provides the synchronized time of day signal to the pseudowire device. The pseudowire device processes the synchronized time of day signal and the frequency information to perform a time-division multiplexing signal to Ethernet signal synchronized conversion.
1 citations
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22 Jan 2014
TL;DR: In this paper, the authors propose a network bandwidth measuring method which comprises the following steps: a slave unit follows a precision time protocol and exchanges messages with a precision-time protocol server, the slave unit synchronizes a slave clock and a master clock of the master clock according to time information relevant to the messages; and the precision-timetime protocol slave unit calculates at least one network bandwidth according to the time information and size information of the messages.
Abstract: The invention provides a network bandwidth measuring method which comprises the following steps: a precision time protocol slave unit follows a precision time protocol and exchanges messages with a precision time protocol server; the precision time protocol slave unit synchronizes a slave clock and a master clock of the precision time protocol server according to time information relevant to the messages; and the precision time protocol slave unit calculates at least one network bandwidth according to time information and size information relevant to the messages.
1 citations
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09 Jan 2020TL;DR: In this paper, the authors describe a method to determine an ingress time from a field in the PTP message overwritten with a value corresponding to the ingress times, and an adjustment for a timing parameter based at least in part on the inggress time.
Abstract: Methods, systems, and devices for wireless communications are described. In an example ingress point of a wireless communication network, a method includes receiving a first ethernet frame comprising a precision time protocol (PTP) message at a first node and determining an ingress time for the PTP message, generating a packet data unit (PDU) for transmission to a second node of the wireless communication network based at least in part on the first ethernet frame by overwriting a field in the PTP message with a value corresponding to the ingress time, and sending the PDU to the second node. An egress point method may include receiving a PDU comprising a PTP message, determining an ingress time from a field in the PTP message overwritten with a value corresponding to the ingress time, and determining an adjustment for a timing parameter based at least in part on the ingress time.
1 citations
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18 Jun 2015
TL;DR: In this paper, a method for comprising the XGEM payload of an Ethernet frame for a giga bit passive optical network is presented, which includes a step of checking whether a precision time protocol (PTP) is a frame relating to a time sink.
Abstract: Provided is a method for comprising the XGEM payload of Ethernet frame for a giga bit passive optical network. The present invention includes a step of checking whether a precision time protocol (PTP) in an Ethernet frame is a frame relating to a time sink, a step of successively arranging XGEM port data from the front part of an XGEM payload region when the precision time protocol is not a frame relating to the time sink, and a step of successively arranging the XGEM port data from the back part of the XGEM payload region when the precision time protocol (PTP) in an Ethernet frame is a frame relating to the time sink.
1 citations
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TL;DR: An enhanced micro-phasor measurement unit (µPMU) that acts as a phasor meter and TSN master controlling the monitoring system synchronism is proposed that guarantees a time stamping with an optimal resolution that allows for the analysis of the influence of fast-evolving atmospheric fluctuations in several plants located in the same geographical area.
Abstract: In the energy sector, distributed synchronism and a high degree of stability are necessary for all real-time monitoring and control systems. Instantaneous response to critical situations is essential for the integration of renewable energies. The most widely used standards for clock synchronisation, such as Network Time Protocol (NTP) and Precision Time Protocol (PTP), do not allow for achieving synchronised simultaneous sampling in distributed systems. In this work, a novel distributed synchronism system based on the Time-Sensitive Networking (TSN) standard has been validated for its integration in an architecture oriented towards the high-resolution digitisation of photovoltaic (PV) generation systems. This method guarantees a time stamping with an optimal resolution that allows for the analysis of the influence of fast-evolving atmospheric fluctuations in several plants located in the same geographical area. This paper proposes an enhanced micro-phasor measurement unit (µPMU) that acts as a phasor meter and TSN master controlling the monitoring system synchronism. With this technique, the synchronism would be extended to the remaining measurement systems that would be involved in the installation at distances greater than 100 m. Several analyses were carried out with an on-line topology of four acquisition systems capturing simultaneously. The influence of the Ethernet network and the transducers involved in the acquisition process were studied. Tests were performed with Ethernet cable lengths of 2, 10, 50, and 75 m. The results were validated with 24-bit Sigma-Delta converters and high-precision resistor networks specialised in high-voltage monitoring. It was observed that with an appropriate choice of sensors and TSN synchronism, phase errors of less than ±1 µs can be guaranteed by performing distributed captures up to 50 kS/s. Statistical analysis showed that uncertainties of less than ±100 ns were achieved with 16-bit Successive Approximation Register (SAR) converters at a moderate cost. Finally, the requirements of the IEEE C37.118.1-2011 standard for phasor measurement units (PMU) were also satisfied. This standard establishes an uncertainty of ±3.1 μs for 50 Hz systems. These results demonstrate the feasibility of implementing a simultaneous sampling system for distributed acquisition systems coordinated by a µPMU.
1 citations