SC-45 (1) - Synchronization with Authoritative Time Source
Control requirements
SC-45 (1) (a)
Compare the internal system clocks [IBM Assignment: at least hourly] with [IBM Assignment: authoritative time source: servertime.service.softlayer.com].
SC-45 (1) (b)
Synchronize the internal system clocks to the authoritative time source when the time difference is greater than [Assignment: organization-defined time period].
NIST supplemental guidance
Synchronization of internal system clocks with an authoritative source provides uniformity of time stamps for systems with multiple system clocks and systems connected over a network.