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B. Frequently asked questions (FAQ)
Q. What do I do if I forget my password?
A. Every access to the CMOS network camera requires an authentication. If you are one of the
managing users, ask your administrator for your password. If you are the administrator, there is no
way of reactivating the root password. The only way of accessing the CMOS network camera is to
press the reset button on the rear of the camera to restore the factory-set parameters and then
reconfigure the system.
Q. Why does no video appear from the CMOS network camera following authentication?
A. This problem can be caused by various factors:
1. If you have just installed the CMOS network camera and see no video, check the video modulation
on the configuration page.
2. Reduce the security level of the Internet Explorer to enable installation of the plug-ins.
3. If this problem recurs, the users are possibly working at a higher level than is permitted by the
system.
Q. What is the plug-in for?
A. The plug-in provided by the CMOS network camera is used for showing video streams in the
Internet Explorer. If your system does not permit the installation of plug-in software, reduce the
security level of the web browser. Consult your network administrator.
Q. Why is there a difference between the timestamp and the system time of the PC/notebook?
A. The timestamp is based on the system time of the CMOS network camera. This is supplied by an
internal realtime clock and can automatically be synchronised with a time server if the CMOS network
camera is connected to the Internet and the function is enabled. Differences of an hour or more are
caused by the time zone setting.
Q. Why is the picture not refreshed regularly?
A. If you use a modem, the bandwidth of the PPP connection is much less that with an Ethernet
connection. If the timestamp difference is unstable, reduce the UART FIFO for reception and
transmission under Modem Properties in the Control Panel. If you use the Ethernet, the reason may
be the length of time required to store snapshots in memory after an event occurs.
Q. How many users can watch the video simultaneously?
A. The number of users is restricted to 20. However, the video quality depends on the network
bandwidth.
Q. How fast is the video rate of the CMOS network cameras?
A. The MPEG4 Codec can internally process 30 frames a second. However, the overall quality
depends on various coefficients.
1. Data throughput in the network
2. Shared bandwidth
3. Number of users
4. The visible "complicated" objects result in large image files.
5. The settings on your PC that are responsible for displaying pictures.
The transmission rate of a normal local network can reach over 200 kilobytes per second and
approximately 10 to 20 frames per second.
Q. How can I keep access to video streams of the CMOS network camera as secure as possible?
A. The CMOS network camera was developed for surveillance purposes and has many flexible
interfaces. User authentication and special confirmation during installation can prevent unauthorised
access to the CMOS network camera. You can also change the HTTP port to a non-public number.
Check the system log for abnormal activities and their causes.
Q. How fast can the CMOS network camera check the state of the digital inputs?
A. The CMOS network camera checks the input state in less than half a second. However, to avoid the
conditions of a repeated check and ensure a correct functioning of equipment connected to the digital
outputs, the CMOS network camera delays for 3 seconds after each adaptation of the condition. You
can modify this according to your own specific applications. During this period, other conditions are
ignored.
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