[CAUSE] The tmnxOesCtlCardPortDown notification is generated when a port (e.g. ES 1 or AUX) on an OES Control Card (e.g. EC card) is not operational. The reason may be a misconnected, disconnected or faulty cable, a faulty port or Control Card. [EFFECT] If an ES (Extension Shelf) port is down then one of the control plane communication paths between EC (Equipment Controller) cards in different OES Chassis is not available. The control communications with one or more OES subtending chassis may be affected rendering the Chassis unmanageable. Other control paths may be available. If an AUX port is down then one of the control plane communication paths between the router and the OES Master Chassis is not available and control communications with the OES may be affected rendering the OES unmanageable. Other control paths may be available. [RECOVERY] Check that the cable is correctly connected and test the cable.