Redundant apparatus
AssigneeFujitsu Limited
InventorsMasatoshi Takita, Kazuei Ohnishi, Takamitsu Saito
Life of this patent
Estimating the term…
Abstract
In a redundant apparatus formed of an active unit and a stand-by unit, an upper unit is connected to the active unit though the connection controller in the normal operation, and controls the connection controller to switch the active unit over to the stand-by unit when a fault has occurred in the active unit. The connection controller includes a diagnosis portion which diagnoses the stand-by unit or the active unit with a test signal and notifies the result to the upper unit.
Claims22
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, and
- switch-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.
A redundant apparatus composed of an active unit and a stand-by unit to which the active unit is switched when a fault has occurred in the active unit, comprising;
- a connection controller which is connected to the active unit and the stand-by unit and switches over the connection, and
- an upper unit which is normally connected to the active unit through the connection controller and transmits a main signal to the active unit 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.
Dependencies are inferred from the claim text.