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For critical applications, one can use a White Rabbit switch. White Rabbit is a technology developed at CERN and other institutes and companies. The switch PCB is Open Source (licensed under the CERN Open Hardware Licence) and all the switching happens inside an FPGA for which all VHDL sources are available under LGPL. There is already one company commercializing it, but the sources are all available for any other company to build it, test it, commercialize it and provide support. The terms of the licence give no privilege to any single vendor. No royalties, no patents. Plus the HDL can be customized for particular applications (low latency, redundancy...).

For critical applications, one can use a White Rabbit switch. White Rabbit is a technology developed at CERN and other institutes and companies. The switch PCB is Open Source (licensed under the CERN Open Hardware Licence) and all the switching happens inside an FPGA for which all VHDL sources are available under LGPL. There is already one company commercializing it, but the sources are all available for any other company to build it, test it, commercialize it and provide support. The terms of the licence give no privilege to any single vendor. No royalties, no patents. Plus the HDL can be customized for particular applications (low latency, redundancy...).

Rumor has it that a white rabbit link will be established between CERN and the OPERA experiment. See http://www.ohwr.org/projects/white-rabbit for more details on how white rabbit would permit synchronizing clocks at each end of the link to within 1ns. This would be an independent measurement of the time of flight.

We at Elphel are now using the new CERN OHL ( http://www.ohwr.org/projects/cernohl/wiki ) and believe it is the closest to GNU GPL we are using fro the sofware

See here: http://www.ohwr.org/attachments/821/sebastien.pdf

The authors have documented their whole procedure here: http://www.ohwr.org/projects/cngs-time-transfer/wiki The author of the bogus paper assumes the people who designed GPS and those who use it in metrology labs around the world to manufacture GPS do not know anything about relativity. He also proceeds to an analysis without checking his very basic premises first with the authors of the neutrino velocity paper, or anybody close to the actual experiment. Is it that hard to check one's assumptions first?

CERN and others have already designed Open Hardware in the OHR. See for example the SPEC board http://www.ohwr.org/projects/spec/wiki the 100 Ms/s ADC mezzanine http://www.ohwr.org/projects/fmc-adc-100m14b4cha/wiki and the Rhino http://www.ohwr.org/projects/rhino-hardware-01/wiki. All of these, and others, you can buy from a number of vendors, and more are in the pipeline. Have a look at the OHR projects page: http://www.ohwr.org/projects

CERN and others have already designed Open Hardware in the OHR. See for example the SPEC board http://www.ohwr.org/projects/spec/wiki the 100 Ms/s ADC mezzanine http://www.ohwr.org/projects/fmc-adc-100m14b4cha/wiki and the Rhino http://www.ohwr.org/projects/rhino-hardware-01/wiki. All of these, and others, you can buy from a number of vendors, and more are in the pipeline. Have a look at the OHR projects page: http://www.ohwr.org/projects

CERN and others have already designed Open Hardware in the OHR. See for example the SPEC board http://www.ohwr.org/projects/spec/wiki the 100 Ms/s ADC mezzanine http://www.ohwr.org/projects/fmc-adc-100m14b4cha/wiki and the Rhino http://www.ohwr.org/projects/rhino-hardware-01/wiki. All of these, and others, you can buy from a number of vendors, and more are in the pipeline. Have a look at the OHR projects page: http://www.ohwr.org/projects

CERN and others have already designed Open Hardware in the OHR. See for example the SPEC board http://www.ohwr.org/projects/spec/wiki the 100 Ms/s ADC mezzanine http://www.ohwr.org/projects/fmc-adc-100m14b4cha/wiki and the Rhino http://www.ohwr.org/projects/rhino-hardware-01/wiki. All of these, and others, you can buy from a number of vendors, and more are in the pipeline. Have a look at the OHR projects page: http://www.ohwr.org/projects

Here's a non-hobbyist site for control and data acquisition hardware: http://www.ohwr.org/