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Q: what is RatingSecu order security camera arrangement process?

RatingSecu order arrangement process



Q: What is the difference between MPEG4 and MJPEG compression?

 A: In CCTV system cameras, compression mode is important for storage, MPEG4 provides better compression, but MJPEG provides higher resolution in some situations. MPEG4 improves the compression by transferring only the difference between frames. MJPEG supports very high resolution.

Q: What is Power over Ethernet or PoE?

A: The latest IP cameras get power over the network --- POE camera. This is referred to as Power over Ethernet (PoE). You can also add a PoE mid span or power injector between the switch and the camera. This means that you only need to run one network cable to each camera, making installation very easy. For more details about PoE take a look at our article about How Power over Ethernet Works.

Q: How Much Bandwidth is Required to Support IP Camera / megapixel HD camera?

A: Calculating bandwidth used by IP cameras is complicated, but it can be estimated. Bandwidth used by an IP camera system is determined by the number of cameras, camera resolution, frame rate, compression used, amount of motion seen by each camera, and sometimes even the lighting.
    For example one frame of video uses about 30K Bytes when using MJPEG compression. If we require 10 frames per second, it takes up 10 frames/sec. X 30K Bytes = 300 K Bytes/sec. which equals 2400 K bits/sec. (using 8 bits per Byte). This can be reduced over 20 times when using the latest H.264 compression, so you use only 120 K bits/sec. To learn more about calculating bandwidth take a look at our article about " Calculating Bandwidth ".

Q: Why does the security analog camera no image?

A: First of all, please check whether the security camera's electrode of power supply is correct, whether the output voltage is according to the requirement( power range: DC12V ± 10%, AC24V ± 5%). Then, please check whether the video line is in good connection; If use manual iris lens, you should check whether the iris is opened or not; If auto iris lens is used, please adjust the LEVEL to the right position.

Q: Why the image of Day & Night IR waterproof camera is good in day time, but white in the night?

 A: It is because of reflection or the IR waterproof camera is used in a small space, and there is infrared reflection. To solve the problem, please check whether there are any reflection things at first, you could improve the environment. Then please check whether the valuable IR distance is consistent to the real usable distance. If a long distance infrared camera is used in a small space, the infrared light would be over brightness to make the image white.

Q: Why the zoom camera could not focus automatically?

A: Please check the camera's focus state is on keying priority or auto-focus, if on keying priority, please turn it to auto focus. If still could not focus automatically, the surrounding environment may be too bright, which makes the camera's brightness value too high, the camera could not find the focal point. Then adjust the camera's brightness value to a lower point. All our intelligent speed dome ptz camera use auto focus mode of the zoom camera module.

Q: What shall we do when we can't see the image, or the image is bad by IP camera?

A: First we should check the IP camera whether have the problem or not, and then to analyze the network or the setup of software and hardware etc.
    a. Check the power supply whether connected, the voltage whether enough
    b. Check the BNC connection or video cable whether poor contact
    c. Check the Iris of lens whether opened
    d. Check the video or the auto Iris lens control line of DC drive whether connected rightly.

Q: What should we pay attention when we control cctv camera from long distance?

A: CCTV camera is easily to be out of the remote control, especially when you use operating keyboard via decoder with long distance, which would cause significantly weakened control signals received by the decoder. In this case, a relay box should be installed at a certain distance to amplify the regulated control signals.

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