The advantages of various types of cable

AddTime£º23-09-2016   Author£ºadmin

Cable in many different environments, resulting in the appearance of a very big difference, but no matter what kind of type, they are used as a signal transmission conductor. Of course, different types of cable, there is also the difference between the quality of performance signals during transmission, in addition to the application of some special cable, currently used in audio and video transmission generally to single conductor and coaxial twisted pair and optical fiber.

First we look at a single wire, single conductor cable is a type of the most basic cable (such as wire), which is composed of one or a group of the plastic protective conductor layer surrounding the composition of the ordinary cable for signal transmission of low frequency power supply, such as audio, computer code ID.

Secondly, coaxial cable, coaxial cable is a complex composed of two conductors, center conductor coaxial cable for signal transmission, the metal shielding net play two roles: as a common ground, signal provides a current loop signal. Two: as a signal shielding network, to suppress the interference of electromagnetic noise on the signal. The center conductor and the shielding net are between the semi foamed polypropylene insulating layer, the insulating layer determines the transmission characteristic of the cable, and effectively protects the middle conductor. It is widely used in the transmission of audio or screen shot, blocking transmission is generally 75-, has become a standard impedance video, of course, the general quality standard coaxial cable is more expensive than twisted pair, because the physical properties of a coaxial cable, audio and video can provide excellent performance, type, frequency, effective transmission distance resolution and cable in the audio and video system plays a role.

There is a twisted pair is a generic name, type and number of stranded conductors and no limit, single cable structure is only two types of twisted pair shielded twisted pair network and without shielding net. Twisted pair is widely used in telecommunications, Internet, professional audio in general, the cable comprises more than two independent mutually insulated cable with each other is continuous, one of the two stranded cable called group, transmission group is generally 100-, single wire diameter specifications in 20AWG (American standard cable to 0.91mm) 24AWG (0.61mm). Twisted pair is a relatively inexpensive cable, each group of wires have the same anti-interference ability, can effectively suppress the external electromagnetic interference.

Finally, the best choice of long distance transmission of the fiber optic cable, optical fiber transmission is based on the photoelectric converter to replace the electronic transmission technology. The simple principle of optical fiber transmission, analog signal transmitted to the optical transmitter, the signal buffer circuit and driver circuit, the voltage signal into a current signal input, photoelectric or laser driven hair, so that the conversion of input signal into optical signal through precise optical guide alignment and coupled into the fiber. After the optical signal is transmitted through the optical fiber, the optical signal at the receiving end is converted into the original electronic source by a wavelength matched photoelectric diode. Optical fiber signal transmission avoids many shortcomings of traditional cable transmission, and has many advantages of cable transmission. For example, excellent anti electromagnetic interference, long distance transmission cable, the cable itself is a huge antenna, there will be picking up the space around the electromagnetic wave signal, especially in the display system is more prominent, this kind of interference signal showing particle noise can not be eliminated in the image display, core optical fiber cable is glass. And the number of transmission of optical signals, not easy to interference by electromagnetic wave.