[CAUSE] The tmnxSatSyncIfTimHoldover notification is generated when the synchronous equipment timing subsystem of the satellite transitions into a holdover state. [EFFECT] The transmit timing of all synchronous interfaces on the satellite are no longer synchronous with the host. This could result in traffic loss. [RECOVERY] Investigate the state of the two input timing references on the satellite and the links between the host and the satellite (i.e. the uplinks) that drive them for failures.