Parental Guidance

Abbreviation for pretty good privacy. A publicly available implementation of a public-key encryption system using no trusted third party.
Note: PGP can be used to apply a digital signature to a message without actually encrypting the text of the message. This is normally used in public postings where the user wants all readers to be able to see the message… (Read More →)

A third circuit derived from two suitably arranged pairs of wires, called side circuits, with each pair of wires being a circuit in itself and at the same time acting as one conductor of the third circuit.
Note: The side circuits are coupled to their respective drops by center-tapped transformers, usually called "repeat coils. " The center taps are on… (Read More →)

A transmission facility derived with repeating coils from two or more pairs of wires. [T1.238-1994/97] Synonyms phantom circuit, phantom pair.
Note: The name "phantom" is derived from the fact that balanced, center-tapped transformers, called "repeat(ing)" coils in telephone parlance, can be used, e.g., in conjunction with two twisted pairs, to create a third, electrically isolated transmission path ("phantom pair") by… (Read More →)

Three circuits that are derived from simplexing two physical circuits to form a phantom circuit.

Synonyms [loosely] phantom circuit, phantom facility.

1. Of a periodic, varying phenomenon, e.g., an electrical signal or electromagnetic wave, any distinguishable instantaneous state of the phenomenon, referred to a fixed reference or another periodic varying phenomenon.
Note 1: Phase, i.e., phase time (frequently abbreviated simply to "phase" in informal usage), can be specified or expressed by time of occurrence relative to a specified reference.
Note 2:… (Read More →)

Of a periodic wave, the number of suitable units of angular measure between a point on the wave and a reference point.
Note 1: The reference point may be a point on another periodic wave. The waves may be plotted on a suitable coordinate system, such as a Cartesian plot, with degrees or other angular measure usually plotted on the… (Read More →)

Of a network or device, the width of the continuous frequency range over which the phase-vs. -frequency characteristic does not depart from linearity by more than a stated amount.

The state in which two signals maintain a fixed phase relationship with each other or with a third signal that can serve as a reference for each.