A frequency that is not to be deliberately jammed by friendly forces, usually during a specified period. [From Weik '89]

A route where the local calling scope from one or more rate centers to other rate centers across NPA boundaries permits either 7- or 7 and 10-digit dialing, a central office code assigned in one specific geographic area of adjacent NPA, but the code may be assigned outside the identified geographic area of the adjacent NPA or local calling scope.

Synonym lockout.

The channel allocated to transport the working traffic during diversity routing. When diversity routing is invoked, traffic on the affected working channels is bridged onto the protection channels. [After T
1. Rpt31-1994]

Type 2 product or data encryption standard equipment that the National Security Agency has endorsed to meet applicable standards for the protection of telecommunications or automated information systems containing national security information. [INFOSEC-1994 Draft]

In high-frequency (HF) radio automatic link establishment, the period between changes in the time-of-day portion of the time-varying randomization data used for encrypting transmissions.

Information that relates a protection requirement to a security transformation that is used to satisfy the specification. [After X9.41]

An informal description of the overall design of a system that delineates each of the protection mechanisms employed. A combination (appropriate to the evaluation class) of formal and informal techniques is used to show that the mechanisms are adequate to enforce the security policy [TCSEC].

An implementation-independent set of security requirements for a family or category of targets of evaluation (TOEs) that meet specified consumer needs. [CC-99]

Privileges that allow an entity to act on behalf of another entity [ECMA138].