The person responsible to the System Manager for the day-to-day operation of a system. vSee also: System Security officer [CESG].

A systematic investigation of a real or planned system to determine the functions of the system and how they relate to each other and to any other system. Synonym systems analysis.

Synonym access denial.

A control message generated within a telecommunications system to indicate temporary unavailability of system resources required to complete a requested access.
Note: The system blocking signal is part of system overhead information.

See power budget.

The identification of the boundaries of a system to establish a firm basis for any interconnection with other systems [CESG].

The collection of documents that describes the requirements, capabilities, limitations, design, operation, and maintenance of a system, such as a communications, computing, or information processing system.

A detailed statement of the technical aspects of a System Security Policy [CESG].
Note: A System Electronic Information Security Policy provides the baseline for evaluation.

In the event of a catastrophic failure, the ability to transfer central office trunks or interoffice trunking to predetermined stations to allow incoming and outgoing calls to be completed.

The study of the effects of a system after it has reached a stabilized state of operational use. Synonyms post-development review, post-implementation review.