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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-
V686WPU 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-V686WPU 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-V686WPU, 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-V686WPU
VN-V686WPU 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 server,
Web Settings page, API
TCP/10020
TCP/10021
TCP/10023
(Reserved for
adjustment)
TCP/32040 Alarm Server
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-V686WPU_EN.book Page 25 Friday, February 8, 2008 5:20 PM