AC
Alternating Current
ACCESS CONTROL SYSTEM
Electronic system used to allow, restrict and track the movement of people through entry/exit points in a site. This is achieved through the use of electronic individual codes, keys or cards etc, to release a locking mechanism.
ACTIVITY DETECTION
A feature built into some multiplexers, which is used to detect movement within a cameras field of view that is then used to improve camera recording update rate.
AGC (AUTOMATIC GAIN CONTROL)
An electronic circuit that is used to boost the video signal in a camera in low light conditions. Use of this feature will usually give a noisy or grainy picture. When comparing camera specifications always use data with AGC off.
ALARM INTERFACE
A facility which allows the use of external alarm equipment such as PIRs, magnetic contacts etc to be connected to CCTV equipment so that when the alarm is activated the CCTV equipment will automatically carry out a pre programmed function such as switching to record a given camera.
ALC (AUTOMATIC LIGHT CONTROL)
A feature of an Auto Iris lens used to adjust the between peak and average...
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