Terminology Compilation

ICMP

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

Image Device

The detector in the camera, either a tube or CCD solid state device.

Image size

Reference to the size of an image formed by the lens onto the camera pickup device. The current standards are: 1", 2/3", 1/2" and 1/3" measured diagonally.

Interlace

PAL video signals transmit odd and even lines alternately. This is a 2:1 interlace. The two sets of lines are combined to form each single frame.

Internal Sync

Devices with internal sync, have an internal crystal to provide sync pulses, without needing reference from any external device.

Infra Red (IR) Low frequency light below the visible spectrum. This is often used for covert or semi-covert surveillance to provide a light source for cameras to record images in dark or zero light conditions
ISDN

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


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