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Term - P


Pan Tilt Zoom - a camera which can be controlled via Joystick or DVR and moved up/down, left/right and zoomed in/out.

Pal :

PAL is an abbreviation for Phase Alternating Line. This is the television display standard that is used mainly in Europe, China, Malaysia, Australia, New Zealand, the Middle East, parts of Africa, and other parts of the world. PAL uses 625 lines per frame and a frame rate of 25 frames per second.

Peak-To-Peak :

The amplitude difference between the most positive and the most negative excursions of a signal.

Picture Element (Pixel) :

Photo sensor site in an image sensor like CCD chip; converts the input light image to an electronic signal.

Pinhole Lens :

A lens with a relatively small front opening so it can be used in covert application.

Pixel :

Picture Element. Photo sensor site in a image sensor like CCD chip; converts the input light image to an electronic signal.

PoE (Power over Ethernet) :

A technology for wired Ethernet LANs that allows the electrical current.


Point-to-Point Protocol. For communications between two computers using a serial interface.


Point-to-Point Protocol over Ethernet.

Presets :

The pre-positioning of pan, tilt and zoom cameras by the use of potentiometers in the moving parts of the camera head. These allow the control equipment to store and move to a set reference point when the controller dictates or when an alarm exists.

Progressive scanning :

It is a method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to the interlacing used in traditional CRT television systems. Progressive video is designed for display on LCD, Plasma, DLP and LCoS monitors.

Protocol :

A special set of rules (in information technology).


Public Switched Telephone Network

Peripherals :

Accessories that can be connected to a computer, or I/O, i.e. monitors, keyboard, printer, mouse, etc.

Privacy Masking :

A function on the camera that allows you to mask a frequently moving object, so it does not activate motion detection.

Panic Bar :

A quick release door lock allowing the door to be quickly opened in the case of an emergency situation. Also Known As - Crash Bar.

Personal Identification Number (PIN) :

A unique numerical code used to identify an individual.

Piggybacking :

1) More than one individual entering a secure area using one access card.
2) Following an authorized person into a secure area. Also Known As - Tailgating. See Anti Passback.


See Personal Identification Number.

Primary Code :

The main identification information provided by an individual to gain access to a secure area. See Auxiliary Code.

Programmable Card :

A card in which data may be encoded.

Programmable Card Reader :

A card reader in which instructions for granting or denying access may be programmed.

Proximity :

A method of reading a card or key tag without requiring any physical contact between the card/tag and the reading device. Click Here for a description of the operating principle behind proximity.

Proximity Card :

A card using proximity technology to store and transmit encoded data.

Proximity Reader :

A reader capable of reading and interpreting cards using radio frequency identification to encode data.

Push-Button Lock :

A lock that opens when a set of push-buttons are pressed in sequence or in unison.

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