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Glossary
Alarm indicator
Visual display to signal an alarm or pre-alarm.
Alarm verification concept
Concept for preventing false alarms which takes into account the interaction of the operating personnel in
the alarming sequence.
C-NET
Addressed detector line for C-NET devices.
C-NET device
A device connected to the C-NET detector line.
Detector line
Electrical connection between the detectors and the fire control panel. There are collective detector lines
and addressed detector lines.
External alarm indicator
Optical element for displaying the fire location, which is at some distance from the detector. It is normally
mounted in the room at the point where the corresponding detector is accessible.
False alarm
Alarm not triggered by a danger.
Floor repeater display
A display device without operating elements.
Floor repeater terminal
A display device with operating elements for acknowledging and resetting alarms and faults.
Isolation
Status of one part of the fire detection installation, which suppresses the evaluation of all signals.
Line separator
An electronic switch which automatically disconnects the defective part of the line in the event of a short-
circuit.
Loop
Detector line topology which runs from the fire control panel via the fire detectors and back to improve
operational reliability. This type of wiring allows all detectors to communicate with the control panel even in
the event of an open line or short-circuit.
Manned
Switching status of the alarm organization, if operating personnel are present and can intervene should an
event arise (alarm, fault).
Parameter set
Defined detector behavior, e.g. in terms of sensitivity, resistance to deceptive phenomena, response time.
Detectors can be operated with different parameter sets.
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