Abbreviation for Greenwich Civil Time. See Coordinated Universal Time.

Abbreviation for group distribution frame.

1. A substance, resembling petroleum jelly in viscosity, that surrounds a fiber, or multiple fibers, enclosed in a loose buffer tube.
Note: This gel serves to lubricate and support the fibers in the buffer tube. It also prevents water intrusion in the event the buffer tube is breached. [FAA]
2. Index-matching material in the form of a gel. [FAA] Synonyms… (Read More →)

GPON Encapsulation Mode

A computer designed to perform, or that is capable of performing, in a reasonably efficient manner, the functions required by both scientific and business applications.
Note: A general purpose computer is often understood to be a large system, capable of supporting remote terminal operations, but it may also be a smaller computer, e.g., a desktop workstation.

See common user network.

A computer system that is designed to aid in solving a wide variety of problems [TCSEC].

In audio and video analog recording, pertaining to the number of duplication steps between an original recording and a given copy.
Note 1: A second generation duplicate is a copy of the original master and a third generation duplicate is a copy of a copy of the original master, etc.
Note 2: Relative to digital duplication, the copy is almost… (Read More →)

In analog recording, cumulative deterioration of signal quality introduced as a consequence of limitations of the recording electronics and storage medium, when successive copies of an original recording are made, each from the preceding copy.
Note 1: Examples of signal deterioration attributable to generation loss are increased distortion, increased noise, change in frequency response, and change in the relative phase… (Read More →)

The synchronization of two television signals at the vertical, horizontal, and chroma phase levels such that the signals may be cut, mixed, or cross-faded without noticeable roll, jump, or chroma shift.
Note: Modern usage accomplishes this with a frame synchronizer/time base corrector, but it may also be accomplished by a closed loop method or an open loop method, the latter… (Read More →)