SC-45(2): Secondary Authoritative Time Source

Control Family:

System and Communications Protection

Parent Control:

SC-45: System Time Synchronization

Baselines:

(Not part of any baseline)

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Control is new to this version of the control set and incorporates the following control from the previous version: AU-8(2): Secondary Authoritative Time Source.

Control Statement

  1. Identify a secondary authoritative time source that is in a different geographic region than the primary authoritative time source; and
  2. Synchronize the internal system clocks to the secondary authoritative time source if the primary authoritative time source is unavailable.

Supplemental Guidance

It may be necessary to employ geolocation information to determine that the secondary authoritative time source is in a different geographic region.