standards and guidelines for communication sites - Radio And ...

GLOSSARY CHAPTER 1: INTRODUCTION
Federal Communications Commission: The US regulatory agency responsible for overseeing
radiated transmissions in the United States.
Firestop: A cross-member used in walls to inhibit vertical spread of fire.
Fixed Network Equipment: Permanently installed communications site infrastructure equipment.
FM: Factory Mutual.
FMV: Fair Market Value.
FNE: Fixed Network Equipment.
FOTS: Fiber Optic Transmission System.
Frequency Deviation: An increase or decrease in the power frequency from nominal. The duration
of a frequency deviation can be from several cycles to several hours (IEEE STD 1100-1999 and IEEE
STD 1159-R2001).
FRU: Field Replaceable Unit.
GFCI: Ground Fault Circuit Interrupting.
Gin pole: Construction equipment used for lifting tower sections and antennas during antenna
construction.
Global Positioning System (GPS): A system which determines exact locations by utilizing highprecision
satellite signals as its reference. The satellite signals can also be used as a timing reference.
Ground Fault Circuit Interrupting (GFCI): A type of electrical receptacle that removes power to
the receptacle if a ground fault occurs in the equipment connected to the receptacle.
Grounding: The connecting of a particular leg of a circuit across multiple equipment of a power
system in common. The common connection is then also electrically bonded to the soil. In this manner,
the grounded portion of the circuit can serve as a common low-side connection across the system.
Synonymous with earthing.
Grounding conductor: A means for bonding equipment to the site grounding electrode system.
Grounding electrode system: A buried system of ground conductors which provides a bonding
point between soil grounding at the site and the neutral-ground connection of the incoming AC power.
The site master ground bar is also bonded to this point.
Ground loop: A potentially detrimental loop formed when two or more points in an electrical system
that are normally at ground potential are connected by a conducting path such that either or both points
are not at the same ground potential.
Ground test well: A buried port that allows inspection of connections to the grounding electrode
system.
Gumbo: A soil composed of fine-grain clays. When wet, the soil is highly plastic, very sticky, and has
a soapy appearance. When dried, it develops large shrinkage cracks.
Hantavirus: A potentially deadly airborne virus spread by rodents.
Hard-wiring: The practice of direct physical connection of wiring leads directly to a junction device.
An example of hard-wiring is the connection of a device's AC line directly to a junction box without the
use of a receptacle and line cord.
1-16 68P81089E50-B 9/1/05