Length of cable needs to be held to 3 ft. if possible. Phil Adamson presented current plans. There are two options in the far detector for pulser placement. Both have the system either daisy-chained together with RS485 control lines or hooked to ethernet. Pulsers must illuminate the fibers, PIN diodes, and possibly monitor tubes.
First option has a pulser box in each frontend rack.
Fibers run 30 planes in length, doing 15 planes in the relevant view. Thus each LED illuminates 15 fibers on different planes. There are 20 LED required by the module numerology. Please note each LED can actually handle 60 fibers. In the second option, pulser boxes are on midlevel.