Installation and Operation Manual
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Appendix-E: Glossary and Acronyms
Alarm Signal. A signal indicating an emergency requiring immediate action, such as an alarm for fire from a
manual station or an automatic smoke detector.
Alarm Silence Inhibit. An option that prevents a human operator from silencing the notification appliances for a
preset period of time.
Alarm System. A combination of compatible initiating devices, control panels, and notification appliances
designed and installed to produce an alarm signal in the event of a fire.
Alarm Verification. A preset option that causes the control panel to verify alarms originated by smoke detectors
before indicating an alarm.
ALU. Addressable Loop Unit.
AMI. Advanced Machine Interface.
Annunciator. A remotely located, electrically powered display separate from the control panel with LEDs or
lamps to indicate the states of the fire alarm system.
Audible Signal. A sound produced by one or more audible notification appliances, such as bells or horns, in
response to the operation of an initiating device.
Class A Circuit. An initiating device or notification appliance circuit within which all components remain fully
functional, even though a single open or a ground is present in the circuit.
Class B Circuit. An initiating device or notification appliance circuit within which some or all components may be
disabled with a single open or a ground exists in the circuit.
CPU. Central Processing Unit.
Detector - Smoke, Photoelectric Type. A detector using the photoelectric principle of reflection or obstruction
of light by smoke.
Detector - Thermal Type. An addressable thermal sensor programmable as either a fixed temperature (135° F)
or as a rate of rise detector.
Enable / Disable. Refers to the state of individual circuits (inputs and outputs) or logic functions, regardless of
the presence of its corresponding modules.
End Of Line (EOL). A device used to terminate a supervised circuit.
FACP. Fire Alarm Control Panel.
Ground Fault. A trouble condition in which a low resistance has been detected between the system wiring and
the conduit ground.
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