Synonym unilateral synchronization system.

A system of synchronization in which signals from a single location are used to synchronize clocks at one or more other locations. Synonym unilateral control system.

Synonym single-mode optical fiber.

Crosstalk that consists of unintelligible signals, hence from which information cannot be derived.

See interference.

A device that is inserted between a primary power source, such as a commercial utility, and the primary power input of equipment to be protected, e.g., a computer system, for the purpose of eliminating the effects of transient anomalies or temporary outages.
Note 1: An UPS consists of an inverter, usually electronic, that is powered by a battery that is… (Read More →)

A two-state signal where one of the states is represented by voltage or current and the other state is represented by no voltage or current.
Note: The current flow can be in either direction.

Key held only by one crypto-equipment and its associated distribution center.

In the representation of a character, a signal element that has a duration equal to the unit interval.

A mathematical artifice consisting of an impulse of infinite amplitude and zero width, and having an area of unity.
Note: The unit impulse is useful for the mathematical expression of the impulse response, i.e., the transfer function, of a device. Synonym Dirac delta function.