Streaming Electronics Working Group, 2018 October 29

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Meeting information

 Meeting time:  11:30 am, 29 October 2018

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Agenda

  • Opening discussion
  • Review of transfer ideas
  • JLab SSP approach
    • The JLab SSP is designed to collect level-one data from all the systems in order to make trigger decisions: Crate Trigger Processors feed data to the SubSytem Processor, which does computations and feeds subsystem info to the Global Trigger Processor.
      • Quote from the SSP manual, page 3: "The SSP module communicates with the GTP and CTP using high speed serial links (2 lanes at 5Gbps for the GTP, 4 lanes at 2.5GBps for the CTP). For the CTP to SSP link a 4 lane full duplex fiber optic link is used to support the high data rate and long distance transmission (up to 150meters). ... The links, after encoding, provide effectively 32bits of data every 4ns that can be used to transfer data that form the L1 trigger."
        JLab SSP manual on DAQ group web site
    • We'd be using these somewhat off-purpose as data-transfer devices, and the SSP would need new firmware. But the interaction with CODA should be very robust.
  • Ethernet approach
    • In my (fairly old) talks with DAQ group, I think this is where they intend to head, but I'm not sure how developed this is right now.
  • General discussion
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