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# White Rabbit overview - end 2015
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White Rabbit (WR) is an extension to Ethernet technology developed in
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collaboration with many institutes and companies. It allows users to
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synchronize remote pieces of equipment to within one billionth of a
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second. The project is completely based on free software and Open Source
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Hardware. Users of WR technology can purchase equipment from commercial
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vendors. This combination of open source and commercial approaches
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allows users to build on top of well-supported solutions without any
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risk of vendor lock-in.
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WR benefits from a vibrant diverse community of developers and users.
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Because many eyes look at designs, bugs get identified early and fixed
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promptly. Also, as often happens with open source developments, WR has
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found uses in areas which are very removed from accelerator control
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systems. Groups in the Netherlands and Finland are exploring ways of
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using WR to disseminate official time. They have therefore contributed
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to the WR effort in order to extend its range from the few km into the
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hundreds of km realm. Other groups have developed extremely robust WR
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hardware because they need it to operate in extreme conditions. One
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example is the WR-based timing system of the HiSCORE Gamma and Cosmic
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Ray detector in the Tunka valley in Siberia. The KM3NeT neutrino
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detector provides for an even more dramatic setting: WR nodes have been
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recently deployed 100 km into Mediterranean Sea off the coast of Italy,
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at a water depth of 3500 m.
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Precise network synchronization is a very active area of development
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worldwide. Recognizing the performance benefits of WR technology, the
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IEEE 1588 working group is currently working on a new revision of the
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standard which includes an effort to take concepts from WR. This will
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allow the IEEE 1588 standard to tackle synchronization applications in
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the nanosecond realm.
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-----
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# Documentation
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- [Overview](http://www.sevensols.com/whiterabbitsolution) by Seven
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- [White Rabbit test
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reports](https://www.ohwr.org/project/wr-switch-testing/wiki#test-reports)
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<!-- end list -->
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- [Status](Status)
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- [Newsletters](newsletters)
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-----
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## Contacts
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-----
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14 August 2014
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16 December 2015
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