[The] totality of protection mechanisms within a network, including hardware, firmware, and software, the combination of which is responsible for enforcing a security policy. [INFOSEC-99]

An internetwork administrative signaling mechanism in the call control procedure between packet switching public data networks.

1. In computer security, a penetration technique in which different communication networks are used to gain access to a data processing system to avoid detection and trace-back. [After 2382-pt.8]
2. [A] penetration technique in which different communication networks are linked to access an information system (IS) to avoid detection and trace-back. [INFOSEC-99]

In a computer networking environment, an application (program) that is centrally stored, e.g., on a server, and copies of which may be accessed on demand by a client and used temporarily (i.e., for a single session) by the client (e.g., a desktop computer).
Note: Multiple clients may make simultaneous use of a given network-launched application.

1. In ac power distribution, the conductor that (a) is intentionally grounded on the supply side of the service disconnect and (b) provides a current return path for ac power currents.
2. In three-phase ac "Y," i.e., wye, power distribution, the low-potential fourth wire that conducts only that current required to achieve electrical balance, i.e., to provide a return path… (Read More →)

A telegraph system in which (a) current flows during marking intervals and no current flows during spacing intervals for the transmission of signals over a line, and (b) the direction of current flow is immaterial. Synonyms single-current system, single-current transmission system, single-Morse system.

An intentional ground applied to the neutral conductor or neutral point of a circuit, transformer, machine, apparatus, or system.

A method of teletypewriter operation in which marking signals are formed by current pulses of one polarity, either positive or negative, and spacing signals are formed by reducing the current to zero or nearly zero.

A relay in which the direction of movement of the armature does not depend upon the direction of the current in the circuit controlling the armature.

All customer premises equipment not in service or in the inventory of a regulated telephone utility as of December 31, 1982.