A period during which a system, circuit, or component is not in use, but is available.

Noise that is present in a communications channel when no signals are applied.
Note: The channel conditions and terminations must be stated for idle-channel noise measurements to be meaningful.

A switch-controlled electrical network that maintains a desired impedance at a trunk or line terminal that is in the idle state.

Identity Management

Abbreviation for integrated digital network.

Identity Provider

Abbreviation for improved-definition television.

Institute of Electrical and Electronics Engineers

International Emergency Preference Scheme

Internet Engineering Task Force