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Proceedings Paper

From Chile to Europe in minutes: handling the data stream from ESO's Paranal Observatory
Author(s): Martino Romaniello; Stefano Zampieri; Cecilia Cerón; Andrew Wright; Reinhard Hanuschik; Cédric Ledoux; Fernando Comerón
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Paper Abstract

The ESO telescopes in Chile are operated in a geographically distributed scheme, in which some of the essential steps in the end-to-end observing chain take place in Europe. Most notably, the health status of the instruments as derived from the data themselves is monitored in Europe and the results fed back to the observatory within the hour. The flexibility of this scheme strongly depends on the speed with which the data stream produced by the telescopes can be sent to Europe for analysis and storage. The main challenge to achieve a fast intercontinental data transfer is the data volume itself, which currently reaches an average 25 GB/night (compressed) for the four VLT Unit Telescopes. Since late 2008, this stream has been entirely transferred through the internet via a 4.56 Mbit/s bandwidth assured via a Quality of Service policy, which sufficed to transfer an average night of data within a few hours. A very recent enlargement of this capacity to 9.12 Mbit/s will soon allow the addition of the calibration data for VISTA, the new infrared survey telescope on Paranal, to the data stream transferred through the internet. Ultimately, the average data volume produced on Paranal once the visible VLT Survey Telescope (VST) and the full complement of second-generation VLT instruments becomes available is expected to exceed 200 GB/night. Transferring it over the internet will require a new fiber-based infrastructure currently under construction, as well as the use of additional high bandwidth channels. This infrastructure, provided by the European Union co-funded project EVALSO, should provide a data transfer capacity exceeding 1 Gbit/s that will allow the transfer to Europe of the entire Paranal data stream, as well as that of the nearby Observatory of Cerro Armazones and of the future European Extremely Large Telescope, with a delay of minutes at most since the data were taken.

Paper Details

Date Published: 29 July 2010
PDF: 6 pages
Proc. SPIE 7737, Observatory Operations: Strategies, Processes, and Systems III, 773724 (29 July 2010); doi: 10.1117/12.859670
Show Author Affiliations
Martino Romaniello, European Southern Observatory (Germany)
Stefano Zampieri, European Southern Observatory (Germany)
Cecilia Cerón, European Southern Observatory (Chile)
Andrew Wright, European Southern Observatory (Chile)
Reinhard Hanuschik, European Southern Observatory (Germany)
Cédric Ledoux, European Southern Observatory (Chile)
Fernando Comerón, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 7737:
Observatory Operations: Strategies, Processes, and Systems III
David R. Silva; Alison B. Peck; B. Thomas Soifer, Editor(s)

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