Controlled area
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In telecommunication, the term controlled area is an area in which uncontrolled movement will not result in compromise of classified information, that is designed to provide administrative control and safety, or that serves as a buffer for controlling access to limited-access areas. It can also refer to an area to which security controls have been applied to protect an information-processing system's equipment and wirelines, equivalent to that required for the information transmitted through the system.
Source: from Federal Standard 1037C and from MIL-STD-188