Why is it important to document outages and restoration of time sources?

• A. To justify deviations and support restorations; provide an audit trail.
• B. It is optional.
• C. It should only be done after audits.
• D. It undermines the reliability of the time sources.

Answer: (A)

Time synchronization underpins event correlation, measurements, and protection actions across the system. When a time source outages, documenting the outage and the restoration is essential because it provides justification for any deviations from the timekeeping requirements and creates an auditable record of how the system maintained or restored accurate time. This supports regulatory audits, enables post-event analysis, and shows that backups were used and the restoration process was carried out properly. It also helps capture the outage duration, the impact on timestamps, and the steps taken to return time sources to service. Documentation is not optional, it isn’t something you only do after audits, and providing records for outages actually enhances reliability by ensuring traceability and controlled restoration of time sources.