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PAL

Stands for Phase Alternate Line – the color video signal standard used in most of Europe, Australia and the Middle East: 625 Lines, 50Hz.
 
Pan/Tilt/Zoom (PTZ)
This is a term for equipment with the ability to pan (horizontal), tilt (vertical), and zoom (in/out), usually by remote user control.

Peak-to-Peak
This is the amplitude (voltage) difference between the most positive and the most negative excursions (peaks) of an electrical signal. A full video signal measures one volt peak to peak.

PIR Motion Sensor
This term refers to a motion detector with passive infrared technology.

Pixel - Picture Element
A pixel is the smallest area of a television picture capable of being delineated by an electrical signal passed through the system of part thereof.

PSTN
This is the term for Public Switched Telephone Network.



 
 
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