![](/images/new-backgrounds/1288791/28879159x1.webp)
Setting
Network Requirements
●Ensure that there is sufficient network bandwidth for the data volume to be sent out by
●Data volume to be sent by
●The maximum bit rate from
Estimation of total bit rate
The JPEG file size per frame varies with the encoding settings as well as input video signals. The following table may be used as a reference. When VFS is selected, the quantization table during JPEG encoding will be maintained and the file size will increase/decrease according to the input signals. When AFS is selected, encoding will be performed such that the average size of multiple JPEG images is the target file size.
Picture Quality | VGA File | QVGA | ||
Control Method | Size | File Size | ||
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VFS | 1 (High) | 80 KB | 27 KB | |
(Variable |
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2 | 60 KB | 20 KB | ||
File Size) | ||||
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| 3 | 40 KB | 13 KB | |
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| 4 (Medium) | 30 KB | 10 KB | |
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| 5 | 25 KB | 8 KB | |
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| 6 | 20 KB | 7 KB | |
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| 7 (Low) | 15 KB | 5 KB | |
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AFS |
| Selection | Selection | |
(Average File Size) | may be | may be | ||
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| made from | made from | |
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| the range | the range | |
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| between 10 | between 3 | |
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| and 100 KB | and 33 KB | |
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10 + 10 + 10 = 30 fps
If the JPEG file size per frame is 30 KB, then the total bit rate will be:
30 KB x 30 fps = 900 KB/s = Approx. 7.2 Mbps
Insufficient network bandwidth
When there is insufficient bandwidth, the number of JPEG frames (frame rate) that the client can acquire will decrease.
Network Delay
When the client acquires JPEG via TCP, VN- C215V4U will send out data while checking the ACK from the client at the same time. For networks with considerable delay, data cannot be sent out until ACK is received, and therefore the frame rate will drop.
Drop of frame rate due to network delay can be eliminated by sending data via multicast.
Network Jitter
When there is considerable network jitter, delay time may be prolonged and the image frame rate may drop.
Packet Loss
When acquiring images from
List of protocols and port numbers used by VN-C215V4U
Protocol/Port No. | Purpose of Use |
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TCP/80 | JPEG acquisition, |
| Web Settings page, |
| API |
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TCP/20, 21 | FTP |
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TCP/25 | Mail delivery |
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TCP/User Setting No. | Alarm sending |
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UDP/User Setting No. | Alarm sending |
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UDP/User Setting No. | Multicast sending |
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UDP /123 | SNTP |
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