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.

FPGA Implementation of Precision Time Protocol and Its Performance Analysis Under Traffic Load

Abstract: Applications running in a distributed network architecture such as industrial automation, Internet of Things (IoT), and avionics systems need time synchronization. IEEE 1588 precision time protocol (PTP), which has been heavily used in these applications, can provide nanosecond-level time synchronization. The time synchronization accuracy can be significantly improved if the time-stamping process is implemented closer to the physical layer. In this paper, the IEEE 1588 protocol has been implemented on Field Programmable Gate Arrays (FPGA) and its performance analysis under various traffic loads are carried out. The experiment results show that the nanosecond-level time synchronization is sustainable when the traffic congestion in the network is low. However, it is observed that the asymmetric path delay in the network adversely affects the synchronization accuracy.

Coordinating actions of devices using scheduling of the actions based on synchronized local clocks

Abstract: A system and method are provided which coordinate the actions of a plurality of devices via scheduling occurrence of the actions based on synchronized local clocks of the devices Thus, a plurality of devices are communicatively coupled via a communication network, and the devices have their local clocks synchronized to a high degree of precision, using IEEE 1588 (Precision Time Protocol),NTP (Network Time Protocol), or some other technique for synchronizing their local clocks "Time bombs" can be scheduled on the devices to coordinate the occurrence of actions between the devices in accordance with the detonation times set for the respective time bombs In certain embodiments, not only the detonation time, but also the respective action to be triggered upon detonation is programmable for each device The time bombs implemented on the various devices can be used to coordinate the operations of the various devices with a high degree of temporal precision

Wind maintenance system using network synchronization techniques based on open-source software

Abstract: The use of open-source software in many institutions and organizations is increasing. However, a balance should be considered between the software cost and the cost of its technical support and reliability. In this article, a maintenance system for wind farms will be presented. It is connected to an information system for maintenance, called SMIT (Terology Integrated Modular System) as a general base to manage the assets and as a support strategic line to the evolution of this system, which incorporates on-condition maintenance modules, and the support to the research and development done around this theme. The SMIT system is based on a TCP/IP network, using a Linux server running a PostgreSQL database and Apache web server with PHP, and Octave and R software for numerical analysis. Maintenance technicians, chiefs, economic and production management personnel can access SMIT database through SMIT clients for Windows. In addition, this maintenance system for wind systems uses also special low cost hardware for data acquisition on floor level. The hardware uses a distributed TCP/IP network to synchronize SMIT server master clock through Precision Time Protocol. Usually, the manufactures construct, deploy and give the means for the suppliers to perform the wind system's maintenance. This is a very competitive area, where companies tend to hide the development details and implementations. Within this scenario, the development of maintenance management models for multiple wind equipments is important, and will allow countries to be more competitive in a growing market. For on-condition monitoring, the algorithms are based on Support Vector Machines and time series analysis running under Octave and R open-source software's.

A novel synchronization method for WR system

Abstract: White Rabbit precision time protocol (WR-PTP) implements sub-nanosecond synchronization of equipment in the fiber network within the range of 10km. For real applications, it needs additional auxiliary fiber link to calibration the asymmetry of the fiber link, because of the different wavelength of the uplink and downlink light. By implement only one wavelength light for both directions, we greatly simplified the calibration process and get one order time higher synchronization precision than the previous method. Without complex recalibration for each link, the new method would make the WR system much easier to be applied.

Analysis and solution of frequency difference in IEEE1588 clock synchronization systems

Abstract: In smart power substations, the application of precision time protocol defined in IEEE1588 becomes more and more popular As a distributed network application, PTP is a perfect service to unify all the clocks of smart subsystems in the power substation It will make great sense to research and improve PTP protocol in order to let it be practical and applicable for power automation applications This paper focuses the performance of PTP For convenience to analyze the performance of PTP, the basic elements, the messages, and protocol procedures are detailedly described in this paper Formulas related with PTP performance are deduced Frequency difference is the main factor to degrade the accuracy of PTP Frequency difference among mater clock, slave clock and transparent clock is fully discussed in this paper The influence in directly connected PTP system and in transparent clock participated PTP system is analyzed from various aspects In the end of the paper, some countermeasures to cope with degradation of PTP performance are suggested