JVC VN-V25U Instructions Manual page 22

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
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
Total bit number of
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-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.
22
Total
maximum bit
rate
12 Mbps
12 Mbps
12 Mbps
Maximum
configurable
value (8
Mbps)
Maximum
number of
distributions
for MPEG4
2
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.
Protocol/Port No.
Source
TCP/80
TCP/10020
TCP/10021
TCP/10023
Destination
TCP/20, 21
TCP/25
TCP/110
TCP/User Setting No.
UDP/123
UDP/User Setting No.
Purpose of Use
JPEG/MPEG4
acquisition, Web
Settings page, API
(Reserved for
adjustment)
FTP
Mail delivery
POP (Mail Delivery)
Sending alarm
SNTP
Sending alarm