1. A marking applied to information, indicating the estimated damage to the national interest that would be caused by its unauthorized disclosure, and used to determine the minimum standards of protection that should be applied [CESG].
2. A component of a security clearance and/or security class used for computing access rights and controlling information flow.
Note: Access rights are granted… (Read More →)

A designator used to describe the service feature privileges, restrictions, and circuit characteristics for lines or trunks that access a switch.
Note: Examples of classmarks include precedence level, conference privilege, security level, and zone restriction. Synonym class-of-service mark.

To cause one or more storage locations to be in a prescribed state, usually that corresponding to a zero or that corresponding to the yyspace character.

1. In radio broadcasting, a frequency assigned for the exclusive use of one entity.
2. In networking, a signal path that provides its full bandwidth for a user's service.
Note: No control or signaling is performed on this path.

A characteristic of a transmission path in which the bit position allocated for customer data may represent any combination of zeros and ones. For the DS1 rate, the bits allocated for customer data are the last 192 bits of each frame. [T1.408-1990]

Contention that occurs when a DTE and a DCE simultaneously transfer a clear request packet and a clear indication packet specifying the same logical channel.
Note: The DCE will consider that the clearing is completed and will not transfer a DCE clear confirmation packet.

A call control signal used to acknowledge reception of the data-terminal-equipment (DTE) clear request by the data circuit-terminating equipment (DCE) or to acknowledge the reception of the DCE clear indication by the DTE.

1. A message that (a) is sent in the forward direction and the backward direction, (b) contains a circuit-released signal or circuit-released acknowledgment signal, and (c) usually contains an indication of whether the message is in the forward or the backward direction.
2. A message in plain language, i.e., not enciphered.

1. Intelligible data, the semantic content of which is available.
2. Synonym plain text.

1. Intelligible data, the semantic content of which is available [7498-2].
2. See: Security Clearance [CESG].