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Questions and answers of twisted pair video transmitter
1. What is the stability of the product? Service life
Answer: According to the normal loss of electronic products, the stability and life are the same as other products.
2. How about the anti-interference of the product?
Answer: The network signal will be disconnected if there is interference. The actual weak and strong current distance of the project should be more than 30 cm. Therefore, according to the standard network wiring method, there will be no interference. If interference problems occur during the test, please do not worry , Check if there is a computer or monitor power supply around. It is recommended to keep a certain distance from these interference sources during the test and use a good quality computer power supply. It is recommended that the test environment be set on a clean wall.
3. There is interference when the multi-function seat transmits 485 control signals and power, what is the reason? Can it be avoided?
Answer: The control signal itself will not interfere. The main reason is that the decoder power supply is not clean and causes control signal interference. Using a good quality decoder, you can also isolate the interference signal by filtering.
4. What about the damage and resistance to lightning?
Answer: This product, like other monitoring equipment, does not have lightning protection function, and must be equipped with lightning arrester or lightning protection equipment.
5. Compatibility with other products
Answer: Compatible with analog CCTV equipment, PAL / NTSC
6. Will it be affected by the climate outdoors?
Answer: The operating temperature of VTA series products is -10 ℃ ~ 55 ℃, and it can work in normal environment. If the outdoor temperature is lower than the normal operating temperature, the general outdoor needs to install a shield with temperature control function to ensure the normal operation of the camera, VTA-15001 Small size, can be installed in the shield.
VTA-15021 is installed on the monitor side (indoor) without considering climate.
7. What is the difference between image transmission using shielded Category 5 cable and unshielded Category 5 cable? How to ground?
Answer: Shielded Cat5 cable has more shielding layer than unshielded Cat5 cable. There is no difference. Shielded Cat5 cable needs to be grounded according to engineering requirements. The front, middle and back ends need to be grounded. .
8. How many repeaters can be cascaded at most? What is the longest transmission distance?
A: In principle, multiple cascades can be connected, but considering that long-distance transmission will have many factors that affect the transmission effect, poor adjustment and coordination of multiple products will also affect the image quality, so it is recommended to use it within 3 kilometers. In general, A transmission distance of 15001 or 15021 is 1200 meters, two transmissions are 1800 meters, three transmissions are 2400 meters, and so on. In order to improve the image quality, 15021 can be added at the same distance.
9. What is the effect of four video signals on one twisted pair and the simultaneous transmission of four audio / power / control / video signals?
A: The effect of transmitting four video signals simultaneously with a single twisted pair is the same as that of transmitting only one video signal, without any interference. When transmitting audio / power / control / video signals at the same time, distance must be considered.
10. Comparison of video cable and twisted pair (using a pair of VTA-6001)
Video cable (75-3)
Video cable (75-5)
Domestic twisted pair
Imported twisted pair (IBDN)
Transmission distance (m)
200 meters
500 meters
300 meters
600 meters
Price (yuan / meter)
1.08 yuan
1.53 yuan
0.75 yuan
1.18 yuan
Scope of application
video
– One of the most commonly used transmission media
– Main materials of the integrated wiring system
--RS-485, rate 10Mbps, distance 4000 feet, 100ohms
-Alarm
Physical properties
Hard / heavy / messy / low density
Light / soft / standard / high density
Transmission capacity
1 = 1 One line transmits one signal
1 = 4 One line transmits four signals, one twisted pair is equivalent to 4 video lines
Image Quality
Under the premise of the same distance and using the same value wire, the picture quality is slightly worse than the twisted pair.
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