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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.


Papers
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Proceedings ArticleDOI
17 Jul 2019
TL;DR: This paper evaluates in detail the matter of the IEEE 1588 standard and provides a “Xilinx ZynqMP UltraScale plus SoC + MAC + PHY” technique, a hardware solution for stamping the arrival and departure period of PTP packets.
Abstract: This work proposes a method for the implementation of PTPd (Precision Time Protocol deamon) with the Gigabit Ethernet Module (GEM) Interface for test devices. The programmable real-time clock and timestamp unit was implemented in the programmable logic to achieve the synchronization accuracy of sub-microsecond. PTPd has been reconfigured and implanted into a FreeRTOS operating system to create a PTP state machine and the IEEE1588 IP core software driver has been created to give the application layer access to the precise timestamp in the link layer. This paper evaluates in detail the matter of the IEEE 1588 standard and provides a “Xilinx ZynqMP UltraScale plus SoC + MAC + PHY” technique, a hardware solution for stamping the arrival and departure period of PTP packets. Where packets are obtained between MAC and PHY layers from Media Independent Interface (MII). The result indicates that the solution can detect the messages transmit and receipt for synchronization accurately.

1 citations

Patent
18 Feb 2013
TL;DR: In this paper, a data network node implementing the Precision Time Protocol (PTP) is described, where low-touch PTP packet processing functions are moved from a PTP processing unit into an efficient network processor.
Abstract: In a data network node implementing the Precision Time Protocol, low-touch PTP packet processing functions are moved from a PTP processing unit into an efficient network processor. An example network node thus includes a time -transfer protocol processing unit that generates negotiation messages and management messages for a time-transfer protocol and forwards said negotiation and management messages to one or more clients. The network node also includes a separate network processor unit, which is adapted to: receive a configuration message from the time-transfer protocol processing unit, the configuration message comprising stream configuration data for a first type of repetitive time -transfer message; generate a plurality of time-transfer messages according to the first type of repetitive time -transfer message, using the stream configuration data; and forward said plurality of time-transfer messages to the one or more remote network nodes, via the one or more line ports.
01 Oct 2013
TL;DR: All the essential features of an FTI network, such as flexible forwarding and filtering and IEEE 1588 synchronization, can be maintained without the need for the separate switch box thus making significant savings on weight and size and reducing cost.
Abstract: Network switches are a critical component in any networked FTI data acquisition system in order to allow the forwarding of data from the DAU to the target destination devices such as the network recorder, PCM gateways, or ground station. Larger configurations require one or more switch boxes to handle aggregation, routing, filtering and synchronization via the IEEE 1588 Precision Time Protocol. However, for smaller configurations where space and weight restrictions are more stringent, a separate switch box may not be practical This paper discusses how all the essential features of an FTI network, such as flexible forwarding and filtering and IEEE 1588 synchronization, can be maintained without the need for the separate switch box thus making significant savings on weight and size and reducing cost.
Patent
31 May 2017
TL;DR: In this article, a wireless communication wake-up circuit, which comprises a smart power source, a sensor module, a wireless transmission module, single-chip, a wakeup unit and a timing chip, is presented.
Abstract: The invention discloses a wireless communication wake-up circuit, which comprises a smart power source, a sensor module, a wireless transmission module, a singlechip, a wakeup unit and a timing chip The smart power source respectively supplies power to the sensor module, the wireless transmission module, the singlechip, the wakeup unit and the timing chip The sensor module is respectively connected to the wireless transmission module and the singlechip; the singlechip is respectively connected to the wakeup unit and the wireless transmission module; the wakeup unit is also connected to the timing chip According to the wireless communication wake-up circuit, the wakeup unit is used to complete intermittent opening and operation of the whole system so as to overcome the problem that a complicated MAC protocol and an accurate and high-cost precision time protocol are adopted in a traditional wireless sensor network for data routing The wireless communication wake-up circuit uses a dual power supply technology to improve the reliability of system communication, is easy to install, saves the cost, simplifies the communication protocol, reduces the nodal communication energy consumption, and extends the life cycle of the system
Patent
24 Jul 2013
TL;DR: In this paper, a method and apparatus for converting a precision time protocol (PTP) to a GPS signal is presented, where the PTP and power over Ethernet (PoE) flow is converted into a pseudo-GPS signal that acts as a timing input into the Femtocell.
Abstract: A method and apparatus are provided for converting a precision time protocol (PTP) to a GPS signal. Enterprise versions of Femtocells are located within buildings and do not have access to a GPS signal directly from a GPS satellite. An adapter is provided that takes an available PTP and power over Ethernet (PoE) flow and converts the signal into a pseudo-GPS signal that acts as a timing input into the Femtocell. The pseudo-GPS signal is a GPS signal modulated at the L1 band frequency or 1575.42 megahertz, but does not have location data nor subframes 1, 2, or 3, as found in an ordinary GPS signal.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202126
202045
201936
201839
201732
201654