Abstract: A static, solid-state originating register for use with an electromechanical telephone cross-bar switching system (e.g. an NE-5* switching system by Northern Telecom) is disclosed. The static, solid-state originating register comprises a plurality of static, solid-state scan networks responsive to an equal plurality of scan points, in a one-to-one relationship, for monitoring the status of the scan points. Also included are a plurality of static, solid-state signal distributor networks for activating associated equipment in the switching system. A microprocessor is employed for controlling the operation of the scan networks and the signal distributor networks. An isolator device is used for interfacing the microprocessor with both the scan networks and the signal distributor networks.