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    User name R. Michaels

    Log entry time 09:56:52 on November16,2010

    Entry number 340329

    This entry is a followup to: 340326

    keyword=further comments re: deadtime

    The DVCS crate readout deadtime is 600 usec with the
    TrigDVCSNoC config. I'm told it is 900 usec with the older
    TrigDVCSBuff config.

    This leads to a 12 - 15 % deadtime at 200 - 250 Hz.

    Meanwhile, the frontend fastbus deadtime is < 50 usec and
    the TS11 deadtime contributes a baseline of 5 to 8% at these
    rates (the deadtime of TS11 fluctuates between 200 usec most
    of the time to 1 msec). This means the bottleneck of the
    system is the DVCS crates, as it should be. Furthermore,
    when the trigger module is fixed this picture of which crate
    makes the bottleneck will not change. Only the rates will
    decrease because of a more selective trigger.