Network Video Recorder User Manual
86
Acronym for Network Time Protocol. A protocol designed to synchronize the clocks of
computers over a network.
NTSC
Acronym for National Television System Committee. NTSC is an analog television standard used
in such countries as the United States and Japan. Each frame of an NTSC signal contains 525
scan lines at 60Hz.
NVR
Acronym for Network Video Recorder. An NVR can be a PC-based or embedded system used for
centralized management and storage for IP cameras, IP Domes and other DVRs.
PAL
Acronym for Phase Alternating Line. PAL is also another video standard used in broadcast
televisions systems in large parts of the world. PAL signal contains 625 scan lines at 50Hz.
PTZ
Acronym for Pan, Tilt, Zoom. PTZ cameras are motor driven systems that allow the camera to
pan left and right, tilt up and down and zoom in and out.
USB
Acronym for Universal Serial Bus. USB is a plug-and-play serial bus standard to interface devices
to a host computer.
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