A twisted pair must conform to the national product standards:

1, the twisted pair used for pure copper core, wire diameter of 0.5 mm.

2. The single core 100-meter resistance is 9.38 ohms, and the 305-meter resistance of a box of wires is about 28 ohms, and should not exceed 30 ohms.

3, twisting density to reach the five kinds of line standard.

4, flexibility, flame retardant to meet the national inspection standards.

2. During wiring, it is forbidden to mix and contact with strong voltage cables or equipment, and it is not allowed to be placed together with frequency conversion equipment and communication signal generator.

For outdoor use, please use outdoor waterproof twisted pair cable.

Four, active and some passive products built-in surge protection, need to be grounded, outdoor applications can be grounded together with the camera, pay attention to the grounding resistance must be qualified (reference value of 4 ohms)

5. Each of the four pairs of cables transmits one signal, so video can be transmitted simultaneously. Audio and control signals, prevent the transmission of high-current power supply in the cable. If a pair of transmission low-voltage power supply DC12V is controlled within 150 meters, AC24V is controlled within 300 meters, and the control signal is controlled within 1000 meters.

6. The video line from the camera to the transmitter should be as short as possible to ensure the stable quality of the signal.