10th White Rabbit Workshop - 6-7 October 2018
The 10th WR workshop was held at CERN, Geneva (Switzerland) on 6-7
October 2018, with 56
Topics included WR technology evolution, applications and the process of standardisation under IEEE 1588.
There was also an introduction for newcomers and ample time for informal discussion in between sessions and during the workshop dinner.
Saturday 6 October 2018
|08:30 - 09:15||Introduction to White Rabbit||Javier Serrano|
|09:15 - 09:45||WR switch: status and plans [pdf]||Greg Daniluk, Adam Wujek|
|09:45 - 10:15||WR PTP core: status and plans [pdf]||Greg Daniluk|
|10:15 - 10:45||WR demo||Greg Daniluk, Adam Wujek|
|10:45 - 11:15||Coffee break|
|11:15 - 11:45||IEEE 1588 standardisation||Maciej Lipiński|
|11:45 - 12:15||WR absolute calibration [pdf]||Peter Jansweijer|
|12:15 - 12:45||PPSi: status and plans||Maciej Lipiński, Jean-Claude Bau, Adam Wujek|
|12:45 - 14:00||Lunch break|
|14:00 - 14:30||Long Distance White Rabbit||Paul Boven|
|14:30 - 15:00||Frequency & Time Performance Review of a 500km cascaded WhiteRabbit Link||Florian Frank|
|15:00 - 15:30||Towards distributed fault-tolerant timekeeping based on a WR-network||Anders Wallin|
|15:30 - 16:00||White Rabbit Industrial Timing Enhancement||Martina Gertosio|
|16:00 - 16:30||Coffee break|
|16:30 - 16:45||DMTD clock generation using FPGA internal PLLs||Hongming Li|
|16:45 - 17:00||WR development and deployment for the LHAASO project||Hongming Li|
|17:00 - 17:30||White Rabbit in Financial Markets [pdf]||Andreas Lohr|
|17:30 - 18:00||White Rabbit case study: preliminary results||Luis Felipe Murillo, Laia Pujol, Pietari Kauttu|
Sunday 7 October 2018
|08:45 - 09:00||RF distribution over WR||John Gill|
|09:00 - 09:15||ESRF timing system based on White Rabbit [pdf]||Antonin Broquet|
|09:15 - 09:30||White Rabbit eXtensions for Instrumentation (WRXI): status and plans||Dimitris Lampridis|
|09:30 - 10:00||On Time - In Time: Successful Operation of the GSI Facility by White Rabbit (except UNILAC)||Dietrich Beck|
|10:00 - 10:30||WR results in 7S and the University of Granada [pdf]||Javier Díaz|
|10:30 - 11:00||Coffee break|
|11:00 - 11:15||Application of WR supporting the time calibration of GNSS installations for metrological use||Carsten Rieck|
|11:15 - 11:30||The TOWR project [pdf]||Ricardo Píriz|
|11:30 - 12:30||Discussion session on next-gen WR switch design||All|
- Introduction to WR: an easy introduction to the technology, status, plans and a survey of its current users, mainly aimed at newcomers. We will also briefly discuss the basic delay calibration procedure for switches and nodes, in view of placing Peter's later discussion on absolute calibration in context.
- WR switch: status and plans: the WR switch is the core of any WR network. This talk presents its internal workings in detail and discusses the latest release of the gateware and software, along with plans for the near future.
- WR PTP core: status and plans: designs of WR nodes typically use the WR PTP core. It is an HDL core which gets instantiated in the node's FPGA and ensures basic interfacing with WR. This talk provides details about the internal design, the latest release and plans for the short-term future.
- WR demo: putting together all the bits and pieces that make a WR network, and testing timing and determinism. The demo will also showcase the latest tools for WR network monitoring and diagnostics.
- PPSi: status and plans: PPSi is the PTP stack we use in WR, implementing the WR extensions. It is Free and Open Source and it can run in hosted environments (such as the Linux running in the WR switch) and in bare-metal systems (such as the soft-core CPU inside the WR PTP core). The talk describes its basic design, the details of the latest release and plans for the short-term future.
- WR absolute calibration: On-site network calibration can be avoided when using absolute calibrated components, which can be freely exchanged without recalibration. Absolute calibration of network components (i.e WR devices and electro-optical converters) enables independent developers and/or vendors to exchange their calibrated components while achieving absolute sub ns timing. Absolute calibration enforces standardization.
- IEEE 1588 standardisation update: A new revision of the IEEE 1588 standard is approaching publication. This new revision includes concepts derived from WR under the "High Accuracy" denomination. In the future, WR gear will also comply with this new revision, making the extensions outside of the standard superfluous. We will present the current status of the standardisation process and the plans for the coming months.
- Long Distance White Rabbit: For both the SKA and the ASTERICS project, we study how the stability of a WR link is affected by factors like wavelength, temperature and fiber type. The SKA is a future radio telescope about to be constructed in semi-desert areas in South Africa and Australia, where WR will be used for time transfer on overhead fiber links of up to 173km. In the ASTERICS project, we research the use of WR for long distance frequency transfer over public fiber. We show how the WR signal can co-exists with an existing DWDM infrastructure, and aim to get close to H-maser performance over a link of up to 165km, to provide a reference signal to the LOFAR and Dwingeloo radio telescopes.
- Frequency & Time Performance Review of a 500km cascaded WhiteRabbit Link: As a premise to deployment of White Rabbit over legacy active optical telecommunication networks, we report on the frequency stability and dissemination using the White Rabbit technology over an in-lab cascaded unidirectional 500km fiber link set-up. We use White Rabbit equipment improved in collaboration with SevenSol and with support of the WR community, and show short term frequency stability of 2·10 -12 averaging down to 4·10 -15 after 200000 s of integration time. No frequency shift is observed within the statistical error bars.
- Towards distributed fault-tolerant timekeeping based on a WR-network: This talk will review progress and plans towards distributed fault-tolerant timekeeping based on a White Rabbit network of clocks. Open hardware is being developed for high performance clock distribution, multiplexing, measurement, and steering. Software for distributed and fault-tolerant modeling of clocks is being developed based on a Kalman filter approach.
- White Rabbit Industrial Timing Enhancement: Time signal distribution is important both in scientific and industrial fields. There is an increasing demand for synchronization networks that provide precise time and frequency from telecommunication operators building 5G mobile communication networks, the power-grid sector that builds and utilizes smart grids and other sustainable energy solutions, the financial sector to comply with EU regulations, and scientific users. New techniques for Time and Frequency dissemination on optic fiber today offer the best performance and the highest resilience. White Rabbit Precision Time Protocol (PTP-WR) is one of the most performing time transfer techniques, providing sub-nanosecond accuracy, resilient and secure timing traceable to Coordinated Universal Time (UTC). It has been demonstrated that WR-PTP can be successfully implemented in long-distance optical fiber links. Since June 2018, a consortium composed of 10 institutions, NMIs, companies and academia, coordinated by INRIM within the program EMPIR of Euramet, is taking part in the project WRITE (White Rabbit Industrial Timing Enhancement). During the White Rabbit workshop, I will present the new features that will be developed to improve the WR-PTP capabilities and to facilitate the take up at the industrial level. These include: calibration techniques to obtain reliable, accurate traceability; devices to improve the robustness and resilience of PTP-WR. Moreover, some tests involving industrial users are planned.
- DMTD clock generation using FPGA internal PLLs: WR nodes typically need to include a dedicated controllable oscillator to generate the offset frequency used by the DMTD phase detector. This presentation shows an alternative method in which that frequency is internally generated in the FPGA, with no need for the additional oscillator. This can help simplify the design of future nodes and can also make it easier to WR-enable existing boards.
- WR development and deployment for the LHAASO project: The construction of LHAASO project has started and a quarter of the detector array will be deployed this year. A special fan-less White Rabbit switch has been developed based on WRS-V3.4. This talk will give the details of the WRS-FL and its first deployment in LHAASO site. Several other WR gears recently developed will also be briefly introduced.
- White Rabbit in Financial Markets: Deutsche Börse Group operates, amongst other things, two electronic financial markets. Xetra, the reference market for exchange trading in German shares and ETFs, and Eurex, a leading global derivatives exchange trading the most liquid EUR-denominated equity index and fixed income derivatives. This presentation explains why Deutsche Börse needs a time synchronization technology superior than standard NTP and PTP and how Deutsche Börse achieved their goals using White Rabbit.
- White Rabbit case study: preliminary results: In this presentation, we will discuss the preliminary results of our research collaboration on the economics and collaborative dynamics of Open Hardware development. Based on the case of "White Rabbit" (WR) at CERN, we will examine the process of creating an open platform for collaborative development involving companies, research centers, and volunteers working with Free and Open Source projects. Our preliminary results were obtained through a combination of research methods, including documentary analysis, interviewing, and a survey conducted by CERN "Knowledge Transfer" in 2016. For the conclusion, we discuss the implications of our results and request comments on a research report we prepared for the European Commission "Open Science Monitor" on WR and its importance for understanding the challenges and benefits of Open Hardware development for the sciences.
- RF distribution over WR: Timing systems in synchrotrons often need to be referenced the RF frequency which accelerates the particles. Phase-compensated RF distribution is also useful in other domains such as radar. This talk presents a method for distributing RF using WR and a distributed DDS approach, along with the current status and plans for the short-term future.
- ESRF timing system based on White Rabbit: The ESRF synchrotron aims at providing extremely bright X rays for the study of matter at atom level. These X rays are generated by the deviation of an electron beam injected in a storage ring. This injection process is managed by the timing system which has been recently refurbished by using the White Rabbit technology and the RF distribution over WR method. This presentation focuses on this new system, its implementation and status.
- WR eXtensions for Instrumentation (WRXI): status and plans: WR can be used to build a "distributed oscilloscope". In order to guarantee plug & play behaviour for the different types of gear involved, some conventions are needed. This talk presents WRXI, its present status and plans for the short-term future.
- On Time - In Time: Successful Operation of the GSI Facility by White Rabbit (except UNILAC): After successful CRYRING operation in 2017, the White Rabbit based General Machine Timing system (GMT) is successfully applied to the retrofitted GSI facility in 2018. This contribution gives an overview on the achievements, shares experience and gives an outlook to the planned activities for the next years.
- WR results in 7S and the University of Granada: a presentation made of three parts: a) Scalability and performance of the WR protocol over large networks; b) Redundant WR technology: HSR White-Rabbit; c) WR Timing solution for SST CTA telescopes.
- Application of WR supporting the time calibration of GNSS installations for metrological use: GNSS calibrations are based on traveling receiver setups that are assumed to be constant with respect to their delays. That either implies the local installation of the traveling antenna cable or the estimation of L-band delays of existing cables in customer installations. The former is often for practical reasons impossible, whereas the latter is difficult and increases uncertainties. At installations where fibers are already deployed, WR is a viable alternative to deterministically present the timescale to the traveling equipment. We present a possible solution and show what challenges this implies.
- The TOWR project: The objective of the TOWR (pronounced “tower”) is the development of a time distribution service via optical fibre over the Madrid region, based on time generation from very stable clocks (hydrogen masers), GNSS time-transfer (including GPS and Galileo) to UTC (k) laboratories, and White-Rabbit technology. The activity aims at demonstrating a robust and accurate “Time-as-a-Service” (TaaS) concept. An increasing number of applications require accurate, reliable, and traceable signals for time and synchronization, normally aligned to Coordinated Universal Time (UTC). Key fields of application are banking and finance, mobile telecommunication networks, and energy grids. The TOWR is proposed as a pilot project for a first customer in the financial market: the Madrid Stock Exchange (Bolsa de Madrid) covering a distance of around 50 km.
11 October 2018