An assembly of computer hardware, firmware, and software configured for the purpose of classifying, sorting, calculating, computing, summarizing, transmitting and receiving, storing, and retrieving data with a minimum of human intervention [TCSEC].

Any equipment or interconnected system or subsystems of equipment that is used in the automatic acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception, of data or information.

See automatic calling unit.

Formerly, a worldwide data communications network of the Defense Communications System, now replaced by the Defense Switched Network (DSN).

See error-correcting code.

In a telephone system, an exchange in which communications among users are effected by means of switches set in operation by the originating user equipment without human intervention at the central office or branch exchange.

A device or circuit that maintains the frequency of an oscillator within the specified limits with respect to a reference frequency.

A machine function or series of machine functions controlled by a program and carried out without assistance of an operator.

A process or means by which gain is automatically adjusted in a specified manner as a function of a specified parameter, such as received signal level.

A service feature of some switching or terminal devices that provides the user with an itemized statement of usage on directly dialed calls.
Note: AIOD is facilitated by automatic number identification (ANI) equipment to provide automatic message accounting (AMA).