Vivotek IP3111/3121, Руководство пользователя

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snapshots into memory upon events occurring.
Q. How does Network Camera detect the supported PTZ cameras automatically?
A. If there is no camera detected, Network Camera will monitor the CTS of the camera control cable
continuously. As long as the CTS is detected, Network Camera will try to handshake with supported
cameras until a supported camera is found. There is no more camera detection once a PTZ camera is
recognized.
Q. How many users are allowed to watch Network Camera at the same time?
A. Basically there is no limitation of users. However the video quality also depends on the network
bandwidth. To achieve the best effect, Network Camera will allow several users to be connected. It is
recommended to build another web server to host a large quantity of users by retrieving images from
Network Camera periodically.
Q. How fast is the video rate of Network Camera?
A. The MPEG4 codec can process 30 frames per second internally. However the total performance is
subject to many coefficients as follows:
1. network throughput.
2. bandwidth share.
3. number of users.
4. the complicated objects in view results in larger image file.
5. the level of your PC or notebook which is responsible for displaying images.
In general, the transfer rate in a general local network environment can achieve over 200 kilobytes per
second and approximately 10 to 20 pictures of a normal environment per second.
Q. How can I keep Network Camera as private as possible?
A. Network Camera is designed for surveillance purposes and has many flexible interfaces. The user
authentication and special confirmation in installation can keep Network Camera from unauthorized
access. You may also change the HTTP port to non-public number. You can check the system log to
examine any abnormal activities and trace the origins.
Q. I have a PTZ camera that is not on the supported list. How can I control it?