User`s manual

Pixel (Picture Element)
A pixel is one of the many tiny, tile-like picture elements (dots) that make up
a digital image.
PoE
The abbreviation of Power over Ethernet refers to a method of power supply
of an IP camera via Cat-5 Ethernet cable over a physically wired LAN
network.
Power supply
Most security cameras utilize 24V AC or 12V DC power supplies. A power
supply is usually plugged into a regular electrical outlet or part of a
centralized power supply.
PPP
PPP is the abbreviation of Point-to-point Protocol. This protocol is used for
establishing direct communication between two computers via a serial
interface, typically a personal computer connected by phone line to a server.
Progressive
Different from Interlaced Scan, progressive scan scans scans all lines in an
image at once, 60 times per second. This scan method dramatically
eliminates the flickering.
Protocol
Protocols are the special set of rules or standard procedures used for
regulating data transmission between two end points in a
telecommunication connection. The existence of Protocol minimizes the
errors during the data transmission.
PTZ Camera
PTZ is the acronym of pan, tilt, and zoom. In IP surveillance, these cameras
are able to make left and right (pan) or upward and downward (tile)
movement. Also, these cameras can zoom in and zoom out, making it very
feature-rich. PTZ cameras are usually remotely controlled via software or a
joystick.
PTZ controller
It is the device to control pan/tilt/zoom camera. It is usually a keypad
controller with software.