[CAUSE] The tmnxOesNtpOutOfSync notification is generated when NTP time on the OES is not synchronized to the host router. The host router must have NTP enabled and have recovered time from external time sources (NTP to PTP). If there is no NTP time source for the router, it will not serve time to the OES. In addition, once the NE is power cycled, it takes approximately 20-30 minutes to initialize. Thereafter, time synchronization will be completed, with a maximum delay time of 2-3 minutes. [EFFECT] Timestamp of each event occurring on the OES may not be exactly aligned with the host router. [RECOVERY] Ensure the host router has NTP configured and a reachable time source. Allow 40 minutes for the condition to clear.