It's a double face TTL logic (HCT family) with a consumption of 30mA with all LEDs turned on. It's powered by the rack monitor module and fuse protected by on board 500mA quick blow AG3 fuse.
The board accepts TTL signals from the rack monitor, external switches and driver and it sends TTL signals to the rack monitor.
Power comes from the rack monitor togheter with signals on a 0.5 meters standard 37 AWG28 wires flat cable.
The board fits in a 19" crate and it shares the crate space with the LVDT signal conditioner.