CMS DAQ Event Builder Based on Gigabit Ethernet

The CMS data acquisition system is designed to build and filter events originating from 476 detector data sources at a maximum trigger rate of 100 kHz. Different architectures and switch technologies have been evaluated to accomplish this purpose. Events will be built in two stages: the first stage...

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Veröffentlicht in:IEEE transactions on nuclear science 2008-02, Vol.55 (1), p.198-202
Hauptverfasser: Bauer, G., Boyer, V., Branson, J., Brett, A., Cano, E., Carboni, A., Ciganek, M., Cittolin, S., Erhan, S., Gigi, D., Glege, F., Gomez-Reino, R., Gulmini, M., Mlot, E.G., Gutleber, J., Jacobs, C., Kim, J.C., Klute, M., Lipeles, E., Perez, J.A.L., Maron, G., Meijers, F., Meschi, E., Moser, R., Murray, S., Oh, A., Orsini, L., Paus, C., Petrucci, A., Pieri, M., Pollet, L., Racz, A., Sakulin, H., Sani, M., Schieferdecker, P., Schwick, C., Sumorok, K., Suzuki, I., Tsirigkas, D., Varela, J.
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Sprache:eng
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Zusammenfassung:The CMS data acquisition system is designed to build and filter events originating from 476 detector data sources at a maximum trigger rate of 100 kHz. Different architectures and switch technologies have been evaluated to accomplish this purpose. Events will be built in two stages: the first stage will be a set of event builders called front-end driver (FED) builders. These will be based on Myrinet technology and will pre-assemble groups of about eight data sources. The second stage will be a set of event builders called readout builders. These will perform the building of full events. A single readout builder will build events from about 60 sources of 16 kB fragments at a rate of 12.5 kHz. In this paper, we present the design of a readout builder based on TCP/IP over Gigabit Ethernet and the refinement that was required to achieve the design throughput. This refinement includes architecture of the readout builder, the setup of TCP/IP, and hardware selection.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2007.914036