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Preparation
(continued)
2. Requirements for network using VN-E4
2-1 Network Bandwidth
Ensure that there is sufficient network bandwidth for the data volume to be transmitted by VN-E4. Data volume to be transmitted
by VN-E4 varies with the number of image or audio distributions.
● Data volume of images
VN-E4 enables creation of up to 8 different types of images.
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
No. 7
No. 8
VN-E4 allows distribution of each image to multiple destinations. Data of image to be transmitted by VN-E4 is therefore the
aggregate total of all these data.
Data volume of No. 1 L no. of distributions + data volume of No. 2 L no. of distributions +...+ data volume of No. 8 L no. of
distributions
The number of distributions shall be the total number of stream transmissions via TCP (number of clients) and multicast.
(Example)
Data volume will be calculated according to the formula below when 3 streams of No. 1 are sent.
JPEG file size per frame L frame rate L 3
If the JPEG file size per frame is 30 KB and frame rate is 30 fps, then data volume will be as follows.
30 KB L 30 fps L 3 = 2700 KB/sec = Approx. 21 Mbps
The JPEG file size per frame varies with the parameter set as well as input video signals. The following table may be used as a
reference.
Picture Quality Control Method
VFS (Variable File Size)
AFS (Average File Size)
CFS (Constant File Size)
● Audio data volume
Audio data transmitted by VN-E4 is at 64 kbps per stream. Audio data volume may be calculated using the following formula.
64 kbps L no. of streams
The number of streams is the total number of streams sent via TCP (number of clients), streams sent via multicast, and stream
received by VN-E4.
(Example)
When VN-E4 sends out 2 audio streams and receives 1 audio stream, data volume will be as follows.
64 kbps L 3 = 192 kbps
NOTE:
When there is insufficient network bandwidth, the number of JPEG frames (frame rate) that may be acquired by the client will
decrease.
In addition, delay time will be prolonged and interruptions will also occur in the audio data.
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Input CH
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
1 (High)
2
3
4 (Medium)
5
6
7 (Low)
Selection may be made from the
range between 10 to 100 KB
Selection may be made from the
range between 10 to 100 KB
Frame Size
VGA
QVGA
VGA
QVGA
VGA
QVGA
VGA
QVGA
VGA File Size
80 KB
60 KB
40 KB
30 KB
25 KB
20 KB
15 KB
QVGA File Size
27 KB
20 KB
13 KB
10 KB
8 KB
7 KB
5 KB
Selection may be made from the
range between 3 to 33 KB
Selection may be made from the
range between 3 to 33 KB
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