Coaxial cable

Coaxial cable has the advantage of cheaper price and more convenient laying (compared to optical fiber). Therefore, in a small range of monitoring systems, due to the transmission distance is very close, the use of coaxial cable directly to monitor the image quality of the image is not damaged, to meet the actual requirements.

In engineering practice, in order to extend the transmission distance, the coaxial amplifier. The coaxial amplifier has a certain amplification to the video signal, and it can compensate the different frequency components with different sizes by adjusting the balance, so that the distortion of the output video signal can be as small as possible.

However, the coaxial amplifier can not be unlimited cascade, generally in a point to point system coaxial amplifier can be cascaded up to 2 to 3, or can not guarantee the quality of video transmission, and it is difficult to adjust. Therefore, when the coaxial cable is used in the monitoring system, in order to ensure a better image quality, the transmission range is generally limited to four or five hundred meters.

In addition, there are some shortcomings in the coaxial cable transmission of image signal in the monitoring system:

1.The coaxial cable itself is affected by climate change, and the image quality is affected;

2.The coaxial cable is thick, the wiring is not convenient in the intensive monitoring application;

3.Coaxial cable can only transmit video signal, if the system needs to transmit the control data, audio and other signals, the need for additional wiring;

4.The anti-interference ability of the coaxial cable is limited and can not be used in strong interference environment;

5.There are some difficulties in adjusting the coaxial amplifier

Optical Fiber

Optical fiber communication technology has become one of the main pillars of modern communication, and plays an important role in modern telecommunication network. Optical fiber communication as a new technology, its rapid development in recent years, the application of a wide range of communication is rare in the history of the main transfer tool and is also an important symbol of the new technology revolution and the future information society, all kinds of information.

Advantages of optical fiber:

1.Communication capacity, transmission distance;

The potential bandwidth of a fiber can reach 20THz. Using such a bandwidth, just a second or so, you can transmit all the text in all over the world. 400Gbit/s system has been put into commercial use. The loss of the optical fiber is very low, the wavelength of the optical fiber is about 1.55 m, and the loss of the quartz fiber can be less than 0.2dB/km, which is lower than that of any transmission medium. Therefore, no relay transmission distance up to dozens, or even hundreds of kilometers.

2.Small signal interference, good security performance;

Anti electromagnetic interference, transmission quality is good, electric communication can not solve all kinds of electromagnetic interference problems, only the optical fiber communication is not subject to various electromagnetic interference.

3.Small size, light weight, easy to lay and transport;

The material source is rich, the environmental protection is good, is advantageous in saves the non-ferrous metal copper.

4.No radiation, difficult to eavesdrop, because the optical fiber transmission can not run out of fiber.

5.Strong adaptability and long service life.

The disadvantages of optical fiber:

1.Brittle texture, poor mechanical strength.

2.Cutting and joining of optical fiber requires certain tools, equipment and technology.

3.Shunt, coupling is not flexible.

4.The bending radius of fiber optic cable should not be too small (>20cm).

The above is about the coaxial cable and optical fiber, more information about the coaxial cable, please pay attention to the official website of kingsignal

Coaxial cable recommendation: CATV Coaxial Cable  

Optical Cable recommendation: Outdoor Communication Optical Cable