PE-11(2)

Requirement
Provide an alternate power supply for the system that is activated [Selection: manually; automatically] and that is:
1. Self-contained;
2. Not reliant on external power generation; and
3. Capable of maintaining [Selection: minimally required operational capability; full operational capability] in the event of an extended loss of the primary power source.

Discussion

The provision of a long-term, self-contained power supply can be satisfied by using one or more generators with sufficient capacity to meet the needs of the organization.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Physical and environmental protection policy; procedures addressing emergency power; alternate power supply; alternate power supply documentation; alternate power supply test records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with the responsibility for emergency power and/or planning; organizational personnel with information security responsibilities].

Test

[SELECT FROM: Mechanisms supporting and/or implementing an alternate power supply; the alternate power supply].

ID	Assessment Objectives
PE-11(02)	an alternate power supply provided for the system is activated <PE-11(02)_ODP[01] SELECTED PARAMETER VALUE>;
PE-11(02)(a)	the alternate power supply provided for the system is self-contained;
PE-11(02)(b)	the alternate power supply provided for the system is not reliant on external power generation;
PE-11(02)(c)	the alternate power supply provided for the system is capable of maintaining <PE-11(02)_ODP[02] SELECTED PARAMETER VALUE> in the event of an extended loss of the primary power source.

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