A ZIF connector is similar to a card-edge connector
for printed circuit boards (PCBs), but takes into account the specific connection needs of flexible circuits.
The Controlinc cards are connected to the control packages by a card-edge connector
that can be unplugged by a technician.
There are times when the FR-4 thickness must be selected to meet a physical need, as in the case of a card-edge connector
or ZIF end, in which case there is no choice.
By their nature, backplanes often provide large inductances between card-edge connectors
and a power supply's bulk capacitance.