29
Note:
1) DDNS default to be off.
2) If users use a router for ADSL dialing, it is able to use the built-in DDNS parsing function in the router.
There is no need to set up a DDNS server.
3) ADSL network provided by telecommunication companies is normally a non-symmetrical network speed
network. Its upstream bandwidth is far slower than the downstream bandwidth, only 512Kbps. There may have
the problems like severe delay and pause when transmitting HD video in this kind of networks. When using
ADSL network as the transmission line, the video definition transmitted is recommended not to exceed the Full
D1 (720X576) format.
5.2.2. RTPS Parameters
The settings of RTSP (Real time streaming protocol) include RTSP setting port, main stream access ID, and
slave stream access ID. Please note that it is required to save the settings and restart the camera to make the
settings effective after configuring the main and slave stream access ID. The camera can support the connection
in VLC compatible mode and QuickTime compatible mode. It defaults to be off as shown below:
Fig. 56.
Starting the RTSP function, users can use VLC or CorePlayer to play RTSP real-time video stream. Please refer
to the section 4.2. about connecting real-time video stream via RTSP protocol. The RTSP port defaults to be 554.
Please choose VLC compatible mode when using VLC software for connection, and choose QuickTime compatible
mode for QuickTime connection. Remote connection requires to add 554 port in the gateway or firewall. Please
refer to Appendix B for port mapping.
5.2.3. NTP Parameters
Click “NTP parameter” to set up the basic parameters for NTP (Network time protocol) service. It defaults to
be off. The NTP protocol is mainly used for time correction and synchronization of the device and the NTP server.
Fig. 57.
Starting the time correction of the NTP server, users can synchronize the network camera automatically with
the NTP server via the connected NTP server. The interval between the synchronizations can be 1/4/10/18/24
hours. Users can find public NTP servers via http://support.ntp.org/bin/view/Servers/WebHome.
Note:
In a monitoring network, it is common to set up the NTP time correction server in the NVR system or video
management center in the back end. The network camera can actively request the center for time
synchronization. Or the network camera can directly carry out the batch time correction for the front-end
network camera.
5.2.4. Heartbeat Setting
Heartbeat is a self-defined command word for user end and server to notify each other their own status.
The status is sent at interval similar to heart beats, so called heartbeat. The heartbeat mechanism is mainly
used for the center to check if the network camera is running properly. By using the method of sending simple
communication patches in fixed time phase, the center can determine if the device is offline if the center
receives no response in a specified time phase.
Fig. 58.
