[CAUSE] The tmnxOesRedundancyFail notification is generated when the inactive equipment controller card in the OES is not providing redundancy protection. In some cases this is a transitory alarm that occurs as redundant Equipment Controllers discover one another and synchronize. Typical causes for the persistence of this alarm are: 1) Irreconcilable database schemas. 2) Inability to support system timing. 3) System timing is compromised. The inactive controller system timing module is not reporting the same status as the active controller or is reporting an error that the active controller does not have. 4) Subshelf link missing. Reasons that are generally transitory are: 1) Database not yet fully synchronized. 2) Software loads are not yet synchronized. Some or all of these may apply when the alarm is raised. [EFFECT] The OES is not protected against failure of the active Equipment Controller. [RECOVERY] Check for the Redundancy demerit in the detailed information of the chassis indicated.