The 19 Slot NCM Rack is a pre-wired connectorized shelf designed to hold Informer's NCM cards. It is NEBS level 3 approved and will hold up to 19 NCM cards. The rack is pre-wired via its connectorized printed circuit board backplane that is attached to the rack. The NCM cards plug into 56-pin connectors, which are attached to the backplane. Each rack is equipped for redundant external power sources through terminal screw locks on the backplane, and redundant fusing.