JVC VN-H37U Instructions Manual page 6

Camera Setting Requirements
Network
(continued)
Insufficient Network Bandwidth
When there is insufficient bandwidth, the
number of JPEG frames (frame rate) that the
client can acquire will decrease. Also, the image
distribution will delay. In the case of H.264, noise
interference may occur and playback may fail.
Network Delay
When the client acquires JPEG via TCP, camera
will send out data while checking the ACK from
the client at the same time. For networks with
considerably delay, data cannot be sent out until
ACK is received, and therefore the frame rate
will drop. In the case of H.264, noise
interference may occur and playback may fail.
A 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 H.264, noise
interference may occur and playback may fail.
Packet Loss
When acquiring images from camera via TCP,
packet loss may be recovered by TCP
transmission. When there is considerable delay
in the network, however, data may lost and the
image frame rate may drop. In the case of
H.264, noise interference may occur and
playback may fail.
If a packet is lost during multicast transmission
from camera, the image frame rate may drop. In
the case of H.264, noise interference may occur
and playback may fail.
6
List of Protocols and Port Numbers
used by Camera
The camera uses the following protocols and
port numbers. Ensure that these ports are
allowed through the firewall when a firewall is to
be installed.
Protocol/Port
number
Source
TCP/80
TCP/554
TCP/10020
TCP/10021
TCP/10023
TCP/32040
Destination
TCP/20, 21
TCP/25
TCP/110
TCP/User-defined
number
UDP/123
UDP/User-defined
number
Purpose of use
JPEG/H.264/MPEG-4
acquisition, Web
Settings page, API
RTSP
(Reserved for
adjustment)
Alarm distribution
FTP
Mail
POP (Mail delivery)
Sending alarm
SNTP
Sending alarm