학술논문
CMS DAQ Event Builder Based on Gigabit Ethernet
Document Type
Conference
Author
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. Gutierrez; Gutleber, J.; Jacobs, C.; Kim, J. C.; Klute, M.; Lipeles, E.; Perez, J. A. Lopez; 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.
Source
2007 15th IEEE-NPSS Real-Time Conference Real-Time Conference, 2007 15th IEEE-NPSS. :1-5 Apr, 2007
Subject
Language
Abstract
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 FED Builders. These will be based on Myrinet technology and will pre-assemble groups of about 8 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 72 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 optimization that was required to achieve the design throughput. This optimization includes architecture of the Readout Builder, the setup of TCP/IP, and hardware selection.