The Mark VI system uses Bently Nevada probes for shaft vibration monitoring. Up to 14 probes connect directly to the TVIB terminal board, two of which can be cabled to the VVIB board. The signals are processed by the VVIB board, and the digitized displacement and velocity signals are sent over the VMEbus to the controller. Also the type 2 terminal board (H2A) has BNC connectors allowing portable vibration data gathering equipment to be plugged in for predictive maintenance purposes.