JVC VN-V686U Instructions Manual page 25

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
Maximum
Preset bit
number of
rate
distributions
0.6 Mbps 20
and below
3 Mbps and 4
below
6 Mbps and 2
below
Larger than 1
6 Mbps
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.
Maximum
number of
Total bit rate
distributions
for JPEG
20 Mbps and 2
below
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
Total maximum
bit rate
12 Mbps
12 Mbps
12 Mbps
Maximum
configurable
value (8 Mbps)
Maximum
number of
distributions
for MPEG4
2
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.
Protocol/Port No.
Source
TCP/80
TCP/10020
TCP/10021
TCP/10023
TCP/32040
Destination
TCP/20, 21
TCP/25
TCP/110
TCP/User Setting
No.
UDP/123
UDP/User Setting
No.
Purpose of Use
JPEG/MPEG4 server,
Web Settings page, API
(Reserved for adjustment)
Alarm server
FTP
Mail delivery
POP (Mail Delivery)
Sending alarm
SNTP
Sending alarm
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