Twisted Pair (Twisted Pair) is a kind of universal wiring made of two mutually insulated wires that are mutually entangled according to certain specifications (individually wound in clockwise) and belongs to the information communication network transmission medium. Twisted pair is important in the past because it is used to transmit analog signals, but today it is also applied to the transmission of digital signals. The twisted-pair wiring should pay attention to those matters, the following analysis is explained as follows:
First, the twisted pair must meet the national twisted pair product specification:
1. The twisted pair used should be a pure copper core. The wire diameter is 0. 5 mm 2 , single core 100 meter resistance is 9. 38 ohms, a box wire is 305 meters resistance is about 28 ohms, not more than 30 ohms 3, the twisting density must reach the five wire specification 4, flexibility Sex and flame retardancy must reach the national test specification.
Second, such as outdoor use, please use outdoor waterproof twisted pair Third, when the project wiring to prevent contact with a strong voltage cable or equipment, can not be placed with the frequency conversion equipment, communication signal generator.
Fourth, four pairs of wires in the cable transmit one signal in each pair, so video can be transmitted at the same time. Audio, master signal, rooted in large current power transmission in the cable. If you need to use a pair of high-voltage power supply DC12V in the network cable within 150 meters, AC24V control within 300 meters, grasp the signal within 1000.
Fifth, active and local passive products have built-in surge protection, need to be grounded, outdoor use can be grounded together with the camera, pay attention to the grounding resistance must pass (reference value 4 ohms)
6. The camera-to-transmitter video line should be as short as possible to ensure that the quality of the signal is stable.
Twisted pair
First, the twisted pair must meet the national twisted pair product specification:
1. The twisted pair used should be a pure copper core. The wire diameter is 0. 5 mm 2 , single core 100 meter resistance is 9. 38 ohms, a box wire is 305 meters resistance is about 28 ohms, not more than 30 ohms 3, the twisting density must reach the five wire specification 4, flexibility Sex and flame retardancy must reach the national test specification.
Second, such as outdoor use, please use outdoor waterproof twisted pair Third, when the project wiring to prevent contact with a strong voltage cable or equipment, can not be placed with the frequency conversion equipment, communication signal generator.
Fourth, four pairs of wires in the cable transmit one signal in each pair, so video can be transmitted at the same time. Audio, master signal, rooted in large current power transmission in the cable. If you need to use a pair of high-voltage power supply DC12V in the network cable within 150 meters, AC24V control within 300 meters, grasp the signal within 1000.
Fifth, active and local passive products have built-in surge protection, need to be grounded, outdoor use can be grounded together with the camera, pay attention to the grounding resistance must pass (reference value 4 ohms)
6. The camera-to-transmitter video line should be as short as possible to ensure that the quality of the signal is stable.
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