Setting; Network Requirements - JVC VN-C215V4U Guide Rapide

Setting

Network Requirements

● Ensure that there is sufficient network
bandwidth for the data volume to be sent out
by VN-C215V4U.
● Data volume to be sent by VN-C215V4U
varies with the settings and number of
distributions.
● The maximum bit rate from VN-C215V4U 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 1 (High)
(Variable
2
File Size)
3
4 (Medium)
5
6
7 (Low)
AFS
(Average File Size)
VN-C215V4U 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
E-30
VGA File QVGA
Size File Size
80 KB 27 KB
60 KB 20 KB
40 KB 13 KB
30 KB 10 KB
25 KB 8 KB
20 KB 7 KB
15 KB 5 KB
Selection Selection
may be may be
made from made from
the range the range
between 10 between 3
and 100 KB and 33 KB
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 VN-C215V4U 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-C215V4U, the image frame
rate may drop.
List of protocols and port numbers used
by VN-C215V4U
VN-C215V4U 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.
TCP/80
TCP/20, 21
TCP/25
TCP/User Setting No.
UDP/User Setting No.
UDP/User Setting No.
UDP /123
Purpose of Use
JPEG acquisition,
Web Settings page,
API
FTP
Mail delivery
Alarm sending
Alarm sending
Multicast sending
SNTP