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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-
V686U 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-V686U 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-V686U, 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-V686U
VN-V686U 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
1Maximum
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 Wednesday, January 16, 2008 10:39 AM