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Connection / Installation
When only MPEG4 images are distributed, the
maximum number of distributions is determined
by the preset bit rate. When a distribution
request that exceeds the maximum number of
distributions is received, this request is denied.
When distributing only MPEG4 data
When both JPEG and MPEG4 images are
distributed simultaneously, distribution up to two
clients for JPEG and MPEG4 respectively is
possible. However, distribution requests that
exceed a total bit rate of 20 Mbps will be denied.
Insufficient network bandwidth
When there is insufficient bandwidth, the
number of JPEG frames (frame rate) that the
client can acquire will decrease. Delay will also
occur in the distribution of images. In the case of
MPEG4, noise interference may occur and
playback may fail.
Network Delay
When the client acquires JPEG via TCP,
VN-V25U 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. In the case of MPEG4,
noise interference may occur and playback may
fail.
Decrease in the frame rate due to network delays
can be eliminated by receiving data via multicast.
Network Jitter
When there is considerable network jitter, delay
time may be prolonged and the image frame rate
may drop. In the case of MPEG4, noise
interference may occur and playback may fail.
Packet Loss
When acquiring images from VN-V25U via TCP,
packet loss may be recovered by TCP
transmission. When there is considerable delay
in the network, however, missing data may occur
and the image frame rate may drop. In the case
of MPEG4, noise interference may occur and
playback may fail.
When packet loss occurs during multicast
sending from VN-V25U, the image frame rate
may drop. In the case of MPEG4, noise
interference may occur and playback may fail.
List of Protocols and Port Numbers
Used by VN-V25U
VN-V25U uses the protocols and port numbers
listed below. Ensure that these ports are allowed
through the firewall when a firewall is to be
installed.
Preset bit
rate
Maximum
number of
distributions
Total
maximum bit
rate
0.6 Mbps
and below
20 12 Mbps
3 Mbps and
below
4 12 Mbps
6 Mbps and
below
2 12 Mbps
Larger than
6 Mbps
1 Maximum
configurable
value (8
Mbps)
Total bit
rate
Maximum
number of
distributions
for JPEG
Maximum
number of
distributions
for MPEG4
20 Mbps and
below
22
Protocol/Port No. Purpose of Use
Source
TCP/80 JPEG/MPEG4
acquisition, Web
Settings page, API
TCP/10020
TCP/10021
TCP/10023
(Reserved for
adjustment)
Destination
TCP/20, 21 FTP
TCP/25 Mail delivery
TCP/110 POP (Mail Delivery)
TCP/User Setting No. Sending alarm
UDP/123 SNTP
UDP/User Setting No. Sending alarm
VN-V25U_EN.book Page 22 Friday, November 9, 2007 10:30 AM