In ac power distribution, a device for sensing deviations of any measured variable, such as voltage, current, or frequency, and capable of initiating a programmed action, such as transfer to other power sources, when programmed limits of voltage, current, frequency, or time are exceeded, or providing an alarm, or both.

Variable Bit Rate

1. virtual circuit,
2. vacant code,
3. virtual channel,
4. virtual concatenation.

1. virtual channel connection,
2. voice call continuity.

Abbreviation for video cassette recorder. See video recorder.

Very high bit-rate Digital Subscriber Line

Very high bit-rate Digital Subscriber Line/2

Abbreviation for visual display unit. See monitor.

Synonym array processor.

Of an electrical or electromagnetic signal, its speed in a physical medium such as a coaxial cable or optical fiber.