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Term - I


Internet Control Message Protocol. A message control and error-reporting protocol.

IEEE (Institute of Electrical and Electronics Engineers, Inc.) :

A non-profit organization, IEEE is the world's leading professional association for the advancement of technology.

Impedance :

Electrical characteristic of a system or component, expressed in ohms. CCTV industry has standardized 75-ohm impedance.

Infrared (IR) Light :

Invisible light beyond the 750 nanometers(red end of the visible lights).


Internal sync mode that sets to internal 2:1 interlace.

Intranet :

A private network. It may consist of many LAN and/or WAN.

IP :

Internet Protocol. A set of rules to send and receive messages at the Internet address level.

Iris :

An adjustable opto-mechanical aperture built into a camera that controls the amount of lights coming through the lens.


Integrated Service Digital Network. A set of standard for digital transmission over ordinary telephone copper wire.

Identification :

The act of recognizing one person as being unique from all other people.

Identification Card :

A card that stores the information necessary to verify the identity of the cardholder.

Infrared Light :

Light with a wavelength that is too low to be seen by the human eye.

Infrared Motion Sensor :

A sensing unit that detects motion based on the disruption of infrared light waves.

Input :

An electronic sensor on a controller that detects a change of state in a device outside the controller. See Normally-Closed, Normally-Open.

Insertion Card :

A card that must be inserted into a reader for the reader to retrieve the information stored on the card.

Intelligent Device :

Any type of microprocessor-based input, output, or sensor device that has free-standing logic capability. These devices can be programmed with instructions that allow them to make their own decisions regarding granting access and sounding alarms. They also can communicate with a host computer to receive new instructions or to send event message logs.

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