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Network Video Recorder User Manual
188
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.
15.2 Frequently Asked Questions
15.2.1 Why is there a part of channels displaying “No Resource” or
turning black screen in multi-screen live view?
Reason
1. Sub-stream resolution or bitrate settings is inappropriate.
2. Connecting sub-stream failed.
Solution
1. Go to Camera → Video Parameters → Sub-Stream. Select the channel, and turn down the
resolution and max. bitrate (resolution shall be less than 720p, max. bitrate shall be less than
2048 Kbps).
Note
If your video recorder notifies not support this function, you can log in to the camera, and
adjust video parameters via web browser.
2. Properly set the sub-stream resolution and max. bitrate (resolution shall be less than 720p,
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