[A] cryptosystem in which encryption and decryption are performed independently of the transmission and reception functions. [INFOSEC-99]

The process of recovering nonprotected message traffic by use of an off-line processor or central processing unit.

Storage that is not under the control of a processing unit.

The process by which telephone calls that originate or pass through private switching systems in transmission networks are extended to stations in a public switched telephone system.

An extension telephone, PBX station, or key system station located on property that is not contiguous with that on which the main telephone, PBX, or key system is located.

1. In radio communications systems, pertaining to a station that is completely shut down, i.e., that is not transmitting any signal, not even an unmodulated carrier.
2. In a radio station, pertaining to a particular source of modulation, such as a specific microphone, that is disconnected, i.e., is no longer capable of modulating the carrier.
Note: The carrier may continue… (Read More →)

1. In radio net operations, the listening, by the net-control station, to the transmissions of stations in the net, particularly to check the quality of their transmissions.
Note: Off-the-air monitoring is usually performed during periods when the net-control station is not transmitting.
2. The listening, by a radio station, to its own transmissions by receiving the signal that has been… (Read More →)

Pertaining to equipment already manufactured and available for delivery from stock.

The total load submitted to a trunk group. This value may be corrected for retrials during the engineering process. [T
1. Rpt 11-1991]

Prior to divestiture, numbers that were assigned to offices according to their hierarchical function in the U. S. public switched telephone network.
Note 1: The following class numbers are used:Class 1: Regional Center (RC)
Class 2: Sectional Center (SC)
Class 3: Primary Center (PC)
Class 4: Toll Center (TC) [Only if operators are present; otherwise Toll Point (TP)]
Class 5:… (Read More →)