I
Impedance
The opposition in an electrical circuit to the flow of an alternating current (AC). Impedance consists of ohmic resistance (R), inductive reactance (Xl), and capacitive reactance (Xc).
Indicating Appliance
Any audible or visual signaling device to indicate a Fire, Supervisory, or Trouble condition.
Induction
An influence exerted by a charged body or by a magnetic field on neighboring bodies without apparent communication.
Inductive Load
An electric device made of wire, wound or coiled, to create a magnetic field to produce mechanical work when energized. Components such as motors, solenoids, and relay coils are all inductive loads by nature.
An inductive load can exhibit an inrush or lock-rotor current of up to five times its normal running or steady state current when energized. When de-energized, the magnetic field collapses and a high-voltage transient is generated, which can cause arcing across contacts or a malfunction of and/or damage to electronic circuits. When transients are present, they should be suppressed. See Transient.
Industrial Process Monitoring
The name for other types of monitoring centers other than fire, burglary and holdup. These can be water-level, boiler-pressure, temperature monitoring, or other systems.
Ingress (Entrance) Device
A device sensor configured to control entrance to a defined area.
Initialize
Function of the panel Programmer that allows user to clear selected panel program parts to default or blank settings. Initialization can includes the following options:
Clear All Memory
Clear All Codes
Clear All Schedules
Clear Display Events Memory
Clear Zone Information
Clear Area information
Clear Output Information
Clear Communication and Remote Options
Initialize Remote Key
Clear Wi-Fi
Set to Factory Defaults
Initiating Device
Any manually or automatically operated equipment that, when activated, initiates an alarm through an alarm signaling device.
Inside Wiring
The telephone wiring inside a customer building that is not the responsibility of the phone company.
Instant Alarm
See Night Zone.
Interlock
A system of multiple doors with controller interaction. Interlocks are also known as fight traps, man traps, and sally ports.
International Standards of Organization (ISO)
An international standards-making body responsible for numerous standards. ISO has defined a number of important computer standards, especially a standardized architecture for designing network.
Internet
A matrix of networks that connects different kinds of computers around the world.
Internet Protocol (IP)
Specifies the format of packets, also called datagrams, and the addressing scheme. Most networks combine IP with a higher-level protocol called Transmission Control Protocol (TCP), which establishes a virtual connection between a destination and a source.
By itself, is something like the postal system. It allows the user to address a package and drop it in the system, but there is no direct link between the user and the recipient.
Intranet
A matrix of computers connected together into an exclusive internal company network.
Invalid Code
A keypad display indicating the panel does not recognize the code being entered. If the user enters a code that is not valid, the keypad first displays TRY AGAIN. If the code is entered again and is still not recognized, the keypad displays INVALID CODE.
Invalid Level
A keypad display that indicates the code entered does not have the necessary authority level to perform the function requested.
Invalid Time
A keypad display that indicates a user has entered their security code outside of an opening/ closing schedule.
Ionization Smoke Detector
A device that detects the presence of charged ions in the air due to a fire. The detector uses a small amount of radioactive material to emit alpha particles that collide with air molecules in a chamber inside the detector. As smoke particles enter the chamber and mix with the air molecules, the ion current flow decreases. This raises the ionic circuit resistance and triggers an alarm.