Alarm is a facility that allows external alarms like PIR's, reed switches, vibration sensors etc. to be connected to the CCTV switcher so that a nominated camera is switched on when an alarm signal is received.
Complex mathematical formulae or rules used to solve problems. In video, they are used to achieve digital compression of a video picture.
Representation of data by continuously varying quantities.
Electronic circuits made up of components that can handle analog signals. Examples: Resistors, capacitors etc.
It is a type of ISDN technology using constant size 53 byte cells instead of variable size packets. Because cells do not change size, they switch much faster and more efficiently.