Twisted Pair (TP) is a widely used type of cabling composed of two insulated copper wires that are twisted together according to specific standards, typically in a clockwise direction. This kind of wiring has long been an essential component in communication networks, originally designed for analog signal transmission but now also widely used for digital signals. When installing or using twisted pair cables, there are several important considerations to keep in mind, as outlined below:
First, the twisted pair cable must meet national product specifications. The core should be made of pure copper, with a wire diameter of 0.5 mm². The resistance for a single core over 100 meters should be around 9.38 ohms, and for a full box of 305 meters, it should not exceed 28 ohms—ideally no more than 30 ohms. The twist density must comply with the five-wire standard, and the cable should have sufficient flexibility and flame resistance as per national testing requirements.
Second, if the twisted pair is to be used outdoors, it is recommended to use an outdoor-rated, waterproof version of the cable to protect against moisture and environmental damage.
Third, during installation, avoid placing the twisted pair near high-voltage cables or equipment. It should also not be run alongside frequency converters or communication signal generators, as these can cause interference and degrade signal quality.
Fourth, in a four-pair twisted pair cable, each pair can transmit one signal independently. This allows for simultaneous transmission of video, audio, and control signals. However, when running power lines within the same cable, such as DC12V for up to 150 meters or AC24V for up to 300 meters, care must be taken to prevent signal interference. For long-distance signal transmission, it’s best to keep the distance under 1000 meters.
Fifth, both active and passive devices often come with built-in surge protection, which requires proper grounding. If used outdoors, the system should be grounded together with the camera, ensuring that the grounding resistance is within acceptable limits—ideally less than 4 ohms.
Lastly, the video line from the camera to the transmitter should be as short as possible to maintain stable and clear signal quality. Longer distances can lead to signal degradation, so it's crucial to minimize unnecessary length whenever possible.
By following these guidelines, you can ensure optimal performance and longevity of your twisted pair cabling system.
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