A unidirectional message, transmitted via a data channel, that requires a response in order for work to proceed logically.

See Electronic Program Guide.

In an integrated services digital network (ISDN), a telecommunications service that facilitates a bidirectional exchange of information among users or among users and hosts.
Note: Interactive services are grouped into conversational services, messaging services, and retrieval services.

On a data recording medium, an area used to indicate the end of a block or physical record.
Note: Examples of interblock gaps are the gaps between blocks on magnetic tape and disks.

1. To stop a telephone call directed to an improper, disconnected, or restricted telephone number, and to redirect that call to an operator or a recording.
2. To gain possession of communications intended for others without their consent, and, ordinarily, without delaying or preventing the transmission.
Note: An intercept may be an authorized or unauthorized action.
3. The acquisition of… (Read More →)

An operator services call request initiated by the network because of the service condition of the line of the called party (e.g., line out of service, etc. ). [T1.661-1997]

Mutual acceptance and exchange of messages between entities. [After X9.24]

A circuit that facilitates the exchange of data and signaling information between data terminal equipment (DTE) and data circuit-terminating equipment (DCE).
Note: An interchange circuit can carry many types of signals and provide many types of service features, such as control signals, timing signals, and common return functions.

1. The ability to exchange hardware components having the same form, fit, and function, across platforms, without affecting the functionality of the system. [JP 1-02]
2. A condition which exists when two or more items possess such functional and physical characteristics as to be equivalent in performance and durability, and are capable of being exchanged one for the other without… (Read More →)

Connectors that share common installation geometry and have the same transmission performance.