The 'Recalc' functionality of OpenComms is done automatically, while designing and whenever modifying existing design. Whenever a change is made using one of the editing commands-i.e. Insert, Delete, Change, or Reconnect, OpenComms Coax automatically recalculates the design levels downstream from the device that was modified. This ensures the design change maintains specifications-devices that pass will have a green circle around them, and those that fail will have either a red circle (actives) or a yellow circle (taps).