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| FRCOMA01 |
‘WhiteRabbit’ - A novel, high precision timing system
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192 |
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- M. Kreider, R. Baer, T. Fleck, C. Prados
GSI, Darmstadt
- E. G. Cota, J. Serrano, T. Wlostowski
CERN, Geneva
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The WhiteRabbit timing network is a deterministic field bus, based on synchronous GBit Ethernet and the Precision Timing Protocol (PTP). The WR protocol was designed to provide precise timing and event distribution for high end real-time systems and was therefore chosen as the timing basis for the new GSI FAIR accelerator facility. With precise phase measurement to compensate for signal propagation delay, a timing accuracy down to sub-nanosecond range is feasible. To achieve necessary determinism and robustness (packet loss of ~10-12 ), an OSI layer two forward error correction and QOS protocol have been introduced. Special switches wield the WR protocol, while being transparent to normal Ethernet traffic. Switch hardware is currently under development at CERN and will be a mixed FPGA/CPU solution. Working prototype cards have been introduced at the 3rd WR Workshop at CERN in 2009, demonstrating phase measurement and PTP capabilities. The presentation will contain detail on technical concepts, current project status, as well as future areas of application will be part of the discussion.
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Slides
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