Patent ID: 6192485
Filing Date: 2001-02-20
Classification: G06F

Abstract:
A redundant apparatus composed of an active unit and a stand-by unit to which the active unit is switched over when a fault has occurred, comprising;a connection controller which is connected to the active unit and the stand-by unit and switches over the connection,an upper unit which is connected to the active unit through the connection controller and transmits a main signal to the active unit in a normal state, and which detects a fault in the active unit and controls the connection controller to switch the faulted active unit over to the stand-by unit, andswitch-over portions which are connected between a lower unit and the active unit in a normal state and, under the control of the upper unit, switch the faulted active unit over to the stand-by unit which is connected to the lower unit in combination with the connection controller.