Communication cable structure, type and parameters, global trade nets is introduced
1 communication cable the classification and use
1. According to installation and operation conditions can be divided into: overhead cables, buried cables and pipelines underwater cables and cable;
2. According to the transmission spectrum can be divided into: low frequency cable (10 KHz) and the high frequency cable (12 KHz) etc. More than
3. According to the cable core structure can be divided into: symmetrical cable and asymmetric cable two kinds big. Symmetrical cable to point to form a communication circuit two wire to the earth of distribution parameters (mainly refers to the distribution of the same cable capacitance), such as the ground cable; Asymmetric cable is to point to form a communication circuit two wire to the distribution of different parameters, such as the coaxial cable.
4. According to the cable insulation materials and insulation structure is divided into: solid polyethylene cable, foam polyethylene cable, foam/solid skin polyethylene insulated cables as well as polyethylene gaskets insulation cables.
5. According to the type of cable security layer can be divided into: plastic set of cable, wire steel tape armored cable, combination sheath cables.
2.2 the chromatographic twisted-pair cable communication product structure and types
The so-called "product" cable is to point to: every cable core wires insulating layer, cable core covering with layer and sheath all use polymer-made of plastic cable. Cable broadband wireless product belongs to with cable. Symmetrical
Coded section 2.3.1 for ammeters product twisted-pair communication cable structure
1. Polishing materials and line diameter
Nominal line diameter: 0.32 mm to 0.4 mm and 0.5 mm and 0.6 mm and 0.8 mm, of 5.
2. The insulation of the core wires
(1) the insulation: high density polyethylene, polypropylene, or ethylene propylene copolymer and a plastic polymer, called polyolefin plastic.
(2) the form of cable insulation product: polishing form into solid insulated, insulation foam insulation, foam/solid skin, as shown in figure 2-1 insulation (a), (b) (c) shows, insulating layer formed by the principle, it is known that the three kinds of insulating form of insulation effect from good to bad sequence of order (c) (b) (a).