Clare Controls 16-Channel NVR with PoE, Руководство пользователя

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Network Video Recorder User Manual 155
Chapter 14
Other Settings
Understanding camera capacity in an NVR
When setting up your NVR and cameras, you may notice that some of the
camera images may not display in Live View. This most often occurs when you
are displaying images in 1+5 mode or 1+7 mode, because the total bit rate for all
cameras is exceeding the NVR’s capacity. The actual capacity depends on the
total bit rate from all the cameras. However, it is good practice to allow some
headroom for machine operations, such as remote streaming.
NVR model Capacity
4-channel 20 Mb
8-channel 40 Mb
16-channel 80 Mb
32-channel 160 Mb
64-channel 160 Mb
To fully understand NVR capacity, it is necessary to understand the concepts of
streaming video, resolution, quality, and bit rate. Streaming video is content sent
in a compressed form over a network and processed in real time.
Streaming video types
• Main Stream: the high quality video that is recorded and streamed.
• Sub Stream: never recorded; intended for streaming only. Default is
704 × 480, 584 Kbps at 8 fps.
• Is video alone, or video and audio compressed together. Audio requires very
little bandwidth.
The combination of the main stream and sub streams makes up the total bit rate
of each camera. This is expressed in Kbps (kilobits per second) or Mbps
(megabits per second).