AU-8 (1)

AU-8 (1): Synchronization With Authoritative Time Source

The information system:

AU-8 (1)(a): Compares the internal information system clocks [Assignment: organization-defined frequency] with [Assignment: organization-defined authoritative time source]; and

AU-8 (1)(b): Synchronizes the internal system clocks to the authoritative time source when the time difference is greater than [Assignment: organization-defined time period].

This control enhancement provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Overlays
None

The controls below (if any) were marked by NIST as being related to AU-8 (1).

Control	Description
No controls

The controls below (if any) add on to the requirements of AU-8 (1).

Control	Description
No controls

The CCIs below are tied to AU-8 (1).

CCI	Definition
CCI-000161	The organization defines the frequency for the synchronization of internal information system clocks.
CCI-001492	The organization defines an authoritative time source for the synchronization of internal information system clocks.
CCI-001891	The information system compares internal information system clocks on an organization-defined frequency with an organization-defined authoritative time source.
CCI-001892	The organization defines the time difference which, when exceeded, will require the information system to synchronize the internal information system clocks to the organization-defined authoritative time source.
CCI-002046	The information system synchronizes the internal system clocks to the authoritative time source when the time difference is greater than the organization-defined time period.