What is surveillance cable? What are the domestic and international manufacturers of surveillance cables?

A. What is a surveillance cable? Surveillance cables are cables that are used to transmit video signals and power signals, and are usually used to connect devices such as surveillance cameras and security cameras. They usually consist of one or more pairs of wires that are externally wrapped with a protective layer that is UV-resistant, abrasion-resistant, waterproof, and moisture-resistant. The structure of a surveillance cable includes internal conductors, insulation, shielding, and an external jacket. Internal conductors are the main part of the signal transmission, they are usually made of copper or aluminum, with good electrical and thermal conductivity. Insulation layers are usually made of materials such as polyethylene or polyvinyl chloride, and they are used to isolate the conductors to avoid problems such as signal interference and short circuits. Shields are usually made of aluminum foil or copper mesh, they are used to counteract external electromagnetic interference and ensure the stability of signal transmission. The outer sheath is used to protect the cable from mechanical damage and environmental influences, and is usually made of PVC, polyethylene and other materials. Surveillance cables are used in a wide range of scenarios, and can be applied to various environments such as indoor, outdoor, underground and underwater. In some occasions where high definition video and audio transmission is required, such as conference rooms, classrooms, theaters, studios, gymnasiums, etc., surveillance cables can provide high-quality signal transmission results and ensure the accuracy and stability of audio and video. In addition, they are widely used in a variety of fields such as surveillance systems, security systems, smart home systems, medical equipment and so on. Surveillance cable usually consists of the following parts: video signal cable: the part that transmits video signals. Generally, it consists of four coaxial lines, three of which are used to transmit the signals of red, green and blue base colors, and the other coaxial line is used to transmit the synchronization signals to ensure the synchronization and stable transmission of video signals. Power cable: the part that transmits the power signal. Generally speaking, it consists of two or more wires for transmitting DC power signals to provide stable power supply for monitoring equipment. Control Signal Line: Transmits control signals. Generally speaking, it consists of multiple wires for transmitting various control signals, such as PTZ control signals, lens control signals, alarm signals, etc., in order to realize the remote control of monitoring equipment. Shielding layer: the part used for shielding external electromagnetic interference. Generally, it is made of materials such as copper foil or aluminum foil, wrapped around the entire cable exterior to protect the signal inside the cable from external electromagnetic interference and ensure the quality of signal transmission. There are several types of common surveillance cables: Twisted Pair: Twisted pair is a common surveillance cable which is usually used to transmit analog video signals. Twisted-pair cable has good anti-jamming performance and anti-electromagnetic interference ability, which can reduce signal loss and interference. Twisted-pair cable is usually used in small and medium-sized surveillance systems. Coaxial Cable: Coaxial cable is a surveillance cable used for transmitting high-definition video signals with video transmission quality and signal stability. Coaxial cable also has high anti-interference performance, suitable for large monitoring system. Fiber Optic: Fiber optic is a kind of surveillance cable for high speed transmission of video signals, with very high bandwidth and transmission speed, it can transmit a large amount of data and video signals. Fiber optic has good signal quality and anti-interference ability, suitable for long-distance transmission and large-scale monitoring system. Combination cable: Combination cable is a kind of surveillance cable that combines several different types of signal wires together. Combination cables can simultaneously transmit video signals, power supply, audio signals and data transmission, with the development of technology, the scope of application of surveillance cables is also expanding. Modern surveillance cables usually have higher transmission speeds and lower bit error rates, and can support a wider variety of video formats and encoding methods, as well as better anti-interference performance and reliability. In addition, some new surveillance cables can also support remote power transmission, can be transmitted through a single cable at the same time the video signal and power signal, greatly simplifying the complexity and cost of wiring.

Second, what are the domestic and foreign manufacturers of monitoring cables?

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