unattended

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Definitions:

A facility is unattended when there is no human presence. Use of roaming guards and/or an intrusion detection system is not enough to consider a facility attended. Having a trusted individual sitting at the entrance to a vault does make the vault attended.
Sources:
CNSSI 4009-2015 from CNSSI 4005

Glossary Comments

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See NISTIR 7298 Rev. 3 for additional details.