Euroball are studying different technologies such as Fibre Channel, HIPPI and SCI for the data acquisition system. The plan is to have a DAQ system available in 1996. They will try to use modules that are already developed in industry or for other experiments.
In 1993 tests have been done with HIPPI to verify the possibility of event building using the TCP/IP protocol.
In 1994 tests have been done with workstations having Fibre Channel ports. Gaetano Maron has done speed measurements using TCP/IP between IBM RS/6000 workstations, using the real IBM cards and the TTCP program. A graph in PostScript (18 KB) is available, showing the message size vs. throughput. The throughput goes up to 14 MB/s using a single stream and using a large buffer size. See as well results from RD-11 for similar measurements.
Euroball expects that each event will contain 200 to 500 Bytes of data.
The event rate is about 50 kHz. This gives in total a total data flow of 30 MByte/sec.
Event building will be done with five channels each running at 6 MByte/sec. Triggering information will be sent over Super events. This Super Trigger has a frequency of about 1 Hz.
Euroball Readout Architectures: requirements, test beds and impact on the trigger system; D. Bazzacco et al.; Instituto Nazionale di Fiscia Nucleare - Sezione di Padova, Italy.
Euroball experiment readout system; G. Maron; DPM workshop 23 June 1994
Contact: Gaetano Maron from INFN (maron@lnl.infn.it).
This is one of the CERN High Speed Interconnect pages - 26 February 1996 - Erik van der Bij