A type of telephone connector. Standard in the US.

A standard network connector, often found at the end of CAT5 cable.

Each CCTV device has its own power requirements (usually 12 volts and a current). The power coming out of the wall (in the UK) is 240 AC. The adaptor converts the AC power to DC power and will adjust it to a specified amperage.

Automatic Gain Control. A circuit for automatically controlling amplifier gain in order to maintain a constant output voltage with a varying input voltage within a predetermined range of input to output variation.

An input connection that triggers the unit to start recording if the alarm is triggered.

There are two main ways of doing things electronically, analogue or digital. An analogue signal can be represented as a series of sine waves. The term originated because the modulation of the carrier wave is analogous to the fluctuations of the human voice or other sound that is being transmitted.

For security cameras, this refers to the angular range in degrees that you can focus the camera on without distorting the image. When focusing close up, you can generally see a wide angle of view. If the focus is distant, the angle of view is smaller or narrower.

In television optics, it is the effective diameter of the lens that controls the amount of light reaching the photoconductive or photo emitting image pickup sensor.

An AVI file is a sound and motion picture file that conforms to the Microsoft Windows Resource Interchange File Format (RIFF) specification. AVI files require a special player that may be included with your web browser.

A system for detecting errors in colour balance in white and black areas of the picture and automatically adjusting the white and black levels of both the red and blue signals as needed for correction.