Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Instrumentation

HK 57.2: Talk

Friday, March 23, 2012, 11:30–11:45, P 2

The Hierarchical CBM Network Structure and the CBMnet V2.0 Protocol — •Frank Lemke, Sven Schenk, and Ulrich Bruening — ZITI University of Heidelberg, Mannheim, Germany

The CBMnet V2.0 Protocol of the DAQ System within the Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt has been demonstrated successfully to be a reliable solution for network communication. It delivers a unified communication over a bidirectional link containing control, data, and synchronization messages and includes clock distribution. In the most recently used setup, 20 Read-Out-Controller (ROC), 5 Data Combiner Boards (DCB), and 4 data sinks were deployed in a hierarchical network. Successful tests for a planned Spartan 6 Board, which will deliver ROC or DCB functionality, were performed and the CBMnet protocol was adapted for achieving all features for the final experiment setup. The CBMnet V2.0 implementation differs in regard to the data handling by delivering reliable data communication. It can be obtained and is easily adaptable to all CBM network parts. CBMnet V2.0 is already integrated into a first tapeout for a front-end detector ASIC. The final setup will have advantages compared to other system solutions. It is specially designed to cater to requirements of CBM. The most important features is that there will be no protocol conversion in the system. Also the hierarchical structure for CBM delivering all communication and synchronization traffic over one link together with link bundling and data rate scaling will minimize the amount of links.