I've taken an MPS signal from a fanout in the counting room (the output was previously just terminated) and patched it through port #18 of the beamline patch panel, which was unused. From there, cable P4 takes it to the VME crate for the Compton FADC, via a level converter to refresh the signal.
The Compton FADC now runs correctly at 30 Hz.
A copy of this log entry has been emailed to: rom@jlab.org, gbfranklin@cmu.edu