White Rabbit

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White Rabbit provides sub-nanosecond accuracy and picoseconds
precision of synchronization for large distributed systems. It also
allows for deterministic and reliable data delivery.White Rabbit allows you to precision time-tag measured data and lets
you trigger data taking in large installations while at the same time
using the same network to transmit data.sub-nanosecond synchronizationconnecting thousands of nodestypical distances of 10 km between nodesEthernet-based gigabit rate reliable data transferfully open hardware, firmware and softwaremulti-vendor commercially produced
hardwareContactMaciej LipinskiTagsDocumentation
White RabbitLatest NewsJob opportunity at CERN: FPGA developerFeb 9, 2026CERN is looking to recruit an FPGA and hardware designer to work on White Rabbit switch v4. The opening is in the frame of the CERN Experienced Graduates Opportunities.
Anyone interested is very welcome to apply and if you have questions don’t hesitate to contact us!Job opportunity at CERN: FPGA developerMay 5, 2025CERN is looking to recruit an FPGA developer to work on the WR Technology and other exciting projects. The opening is in the frame of the CERN Experienced Graduates Opportunities.
Anyone interested is very welcome to apply and if you have questions don’t hesitate to contact us!Job vacancy at CERN to work on White Rabbit and RFSep 25, 2024We have an open position at CERN to work for 2-3 years on the evolution of the eRTM board. It is a WR node whose jitter (integrated between 100Hz and 20MHz) is less than 100 femtoseconds, the most precise WR node I know of, originally designed by Mattia Rizzi and Tomasz Włostowski.See All NewsAboutForumLicencesNewsProjectsSubmit Project
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White Rabbit is a technology designed to facilitate synchronization in large distributed systems, offering sub-nanosecond accuracy and picosecond precision. This system enables deterministic and reliable data delivery, allowing users to precisely time-tag measured data and trigger data acquisition in large installations while simultaneously utilizing the same network infrastructure for data transmission. A key feature of White Rabbit is its ability to achieve sub-nanosecond synchronization across thousands of nodes, typically spanning distances of 10 kilometers between them. The underlying data transfer mechanism is based on Ethernet, ensuring a reliable gigabit rate data transfer. Furthermore, the system promotes an open architecture, providing fully open hardware, firmware, and software, which contributes to its adaptability.

The application of White Rabbit extends to highly precise measurements and control. It allows for the time-stamping of data and the triggering of data taking events across vast physical installations, all orchestrated over a unified network. The technology is associated with individuals such as Maciej Lipinski, and the project has involved highly specialized expertise, as evidenced by job opportunities at CERN related to the White Rabbit technology. These opportunities, such as the request for an FPGA developer, indicate ongoing development and application within high-performance computing environments. Specific technical achievements are noted in the development of precision components; for instance, a particular White Rabbit node, the eRTM board, exhibits extremely low jitter, integrated between 100 Hertz and 20 Megahertz, measuring less than 100 femtoseconds. This component was originally designed by Mattia Rizzi and Tomasz Włostowski, highlighting the foundational precision embedded within the system's architecture.