JVC VN-C215VP4U Instruction Manual - Page 32

Setting, Network Requirements - vn 900

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Setting Network Requirements ● Ensure that there is sufficient network bandwidth for the data volume to be sent out by VN-C215VP4U. ● Data volume to be sent by VN-C215VP4U varies with the settings and number of distributions. ● The maximum bit rate from VN-C215VP4U is about 9 Mbps. 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 Control Method VFS (Variable File Size) 1 (High) 2 3 4 (Medium) 5 6 7 (Low) AFS (Average File Size) VGA File Size 80 KB 60 KB 40 KB 30 KB 25 KB 20 KB 15 KB Selection may be made from the range between 10 and 100 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 and 33 KB VN-C215VP4U accepts requests from up to a maximum of 5 clients. In addition, it also allows transmission of 1 multicast stream. The total frame rate refers to the sum of these frame rates. For example, when 10 fps is requested by 2 clients, and in addition multicast is transmitted at a rate of 10 fps, the total frame rate will be: 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 32 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, VNC215VP4U 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 VN-C215VP4U via TCP, packet loss may be recovered by resending by TCP. When there is considerable delay during resending, however, missing data may occur and the image frame rate may drop. When packet loss occurs during multicast sending from VN-C215VP4U, the image frame rate may drop. List of protocols and port numbers used by VN-C215VP4U VN-C215VP4U uses the protocols and port numbers listed below. Ensure that these ports are allowed through the firewall when a firewall is to be installed. Protocol/Port No. Purpose of Use TCP/80 JPEG acquisition, Web Settings page, API TCP/20, 21 FTP TCP/25 Mail delivery TCP/User Setting No. Alarm sending UDP/User Setting No. Alarm sending UDP/User Setting No. Multicast sending UDP /123 SNTP

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32
Setting
●
Ensure that there is sufficient network
bandwidth for the data volume to be sent out
by VN-C215VP4U.
●
Data volume to be sent by VN-C215VP4U varies
with the settings and number of distributions.
●
The maximum bit rate from VN-C215VP4U is
about 9 Mbps.
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.
VN-C215VP4U accepts requests from up to a
maximum of 5 clients. In addition, it also allows
transmission of 1 multicast stream. The total frame
rate refers to the sum of these frame rates.
For example, when 10 fps is requested by 2
clients, and in addition multicast is transmitted at
a rate of 10 fps, the total frame rate will be:
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-
C215VP4U 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 VN-C215VP4U via
TCP, packet loss may be recovered by resending
by TCP. When there is considerable delay during
resending, however, missing data may occur and
the image frame rate may drop.
When packet loss occurs during multicast
sending from VN-C215VP4U, the image frame
rate may drop.
List of protocols and port numbers used
by VN-C215VP4U
VN-C215VP4U
uses the protocols and port
numbers listed below. Ensure that these ports are
allowed through the firewall when a firewall is to be
installed.
Network Requirements
Picture Quality
Control Method
VGA File
Size
QVGA
File Size
VFS
(Variable
File Size)
1 (High)
80 KB
27 KB
2
60 KB
20 KB
3
40 KB
13 KB
4
(Medium)
30 KB
10 KB
5
25 KB
8 KB
6
20 KB
7 KB
7 (Low)
15 KB
5 KB
AFS
(Average File Size)
Selection
may be
made from
the range
between 10
and 100 KB
Selection
may be
made from
the range
between 3
and 33 KB
Protocol/Port No.
Purpose of Use
TCP/80
JPEG acquisition, Web
Settings page, API
TCP/20, 21
FTP
TCP/25
Mail delivery
TCP/User Setting No.
Alarm sending
UDP/User Setting No.
Alarm sending
UDP/User Setting No.
Multicast sending
UDP /123
SNTP