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Selection of customized coaxial cable, twisted pair wire and fiber optic cable in china

Selection of customized coaxial cable, twisted pair wire and fiber optic cable in china

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  • Release time:2022-07-12
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(Summary description)Customized coaxial cable, twisted pair wire and fiber optic cable in china are commonly used transmission media in generic cabling, so what is the difference between them? How should we choose them in the project? Let's learn about it today.

Selection of customized coaxial cable, twisted pair wire and fiber optic cable in china

(Summary description)Customized coaxial cable, twisted pair wire and fiber optic cable in china are commonly used transmission media in generic cabling, so what is the difference between them? How should we choose them in the project? Let's learn about it today.

  • Classification:news
  • Author:
  • Origin:
  • Release time:2022-07-12
  • Views:0
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Customized coaxial cable, twisted pair wire and fiber optic cable in china are commonly used transmission media in generic cabling, so what is the difference between them? How should we choose them in the project? Let's learn about it today.

1、 Customized coaxial cable in china

Customized coaxial cable in china is a cable with a central copper conductor wrapped by layers of insulated wires. It is characterized by good anti-interference ability, stable transmission data and low price, so it is widely used, such as closed-circuit television lines.

However, according to the analysis of the characteristics of the customized coaxial cable itself, when the signal is transmitted in the coaxial cable, the attenuation is related to the transmission distance and the frequency of the signal itself. Generally speaking, the higher the signal frequency, the greater the attenuation. Therefore,customized coaxial cable in china is only suitable for short-range transmission of image signals. When the transmission distance reaches about 200 meters, the image quality will decline significantly, especially the color will become dim and have a sense of distortion.

In practical engineering, in order to extend the transmission distance, coaxial amplifier should be used. The coaxial amplifier can amplify the video signal to a certain extent, and can compensate different frequency components by balancing adjustment, so as to minimize the distortion of the video signal output at the receiving end. However, coaxial amplifiers cannot be cascaded indefinitely. Generally, in a point-to-point system, coaxial amplifiers can only be cascaded 2 to 3, otherwise the video transmission quality cannot be guaranteed, and it is difficult to adjust. Therefore, when using customized coaxial cable in the monitoring system, in order to ensure better image quality, the transmission distance range is generally limited to about fourorfive meters.

2、Customized twisted pair wire in china

Common wisted pair wire in china include class 3 wire, class 5 wire, super class 5 wire, class 6 wire, and class 7 wire.

1. Class V cable: this kind of customized twisted pair wire in china increases the winding density and is covered with a high-quality insulating material with a transmission rate of 100MHz. It is used for voice transmission and data transmission with a transmission rate of 100Mbps. It is mainly used for 100Base-T and 10Base-T networks. This is a commonly used Ethernet cable.

2. Super class 5 line: super class 5 has low attenuation, less crosstalk, higher ratio of attenuation to crosstalk, signal-to-noise ratio, smaller delay error, and greatly improved performance. The transmission rate of cat 5 is 250mbps.

3. Class VI cable: the transmission frequency of this kind of customized twisted pair wire in china is 1MHz ~ 250MHz. The comprehensive attenuation crosstalk ratio (PS-ACR) of class VI cabling system should have a large margin at 200MHz, which provides 2 times the bandwidth of super class v. The transmission performance of category 6 wiring is much higher than that of category 5 standard, which is suitable for applications with transmission rate higher than 1Gbps.

4. Cat 6 wire: Cat 6 wire is an improved version of Cat 6 wire, which is also ansi/eia/tia-568b A kind of unshielded twisted pair cable specified in ISO class 6 /e standards, which is mainly used in Gigabit networks. In terms of transmission frequency, it is also 200 ~ 250 MHz like cat 6 line, and the transmission speed can also reach 1000 Mbps, but it has been greatly improved in terms of crosstalk, attenuation and signal-to-noise ratio.

5. Class 7 line: this line is a twisted pair in ISO class 7 /f standard, which is mainly to adapt to the application and development of 10 Gigabit Ethernet technology. However, it is no longer an unshielded twisted pair, but a shielded twisted pair, so its transmission frequency can reach at least 500 MHz, more than twice that of Cat 6 and Super Cat 6 lines, and the transmission rate can reach 10 Gbps.

The reason why customized twisted pair wire in china is so widely used is that it has many advantages, such as strong anti-interference ability, long transmission distance, easy wiring, low price and so on. Due to the large attenuation of customized twisted pair wire signals, the frequency of signals cannot be too high when the transmission distance is long, while high-speed signals such as Ethernet can only be limited within 100m.

3、Customized fiber optic cable in china

Customized fiber optic cable in china transmit signals in the form of optical pulses, so the material is also mainly glass or plexiglass. The utility model is composed of a fiber core, a cladding and a protective sleeve.

The structure of Customized fiber optic cable in china is very similar to that of coaxial cable. The center is an optical fiber made of glass or transparent plastic, surrounded by protective materials. According to needs, multiple optical fiber cables can be combined into an optical cable.

According to the different ways of optical signal generation, customized fiber optic cable in china can be divided into single-mode optical fiber and multimode optical fiber (the so-called "mode" refers to a beam of light entering the optical fiber at a certain angle). Multimode fiber is generally used for network connection in the same office building or relatively close area. Single mode optical fiber is usually used to connect between office buildings or geographically dispersed networks because of its higher quality and longer transmission distance. If the customized fiber optic cable in china is used as the network transmission medium, it also needs to add optical transceiver and other equipment, so the cost investment is larger and it is less used in general applications.

The characteristic of customized fiber optic cable in china is that it transmits optical signals, so it is not interfered by external electromagnetic signals, and the attenuation speed of the signal is very slow, so the transmission distance of the signal is much farther than the above various network cables transmitting electrical signals, and it is especially suitable for places with poor electromagnetic environment.

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