The purpose of the communication cable is to form the t […]
The purpose of the communication cable is to form the transmission of information channels, forming a communication network extending in all directions. Communication cables can be classified according to the laying and operating conditions, the spectrum of transmission, the structure of the cable core, the insulating material and the insulating structure, and the type of covering. According to laying and operating conditions can be divided into: overhead cables, buried cables, pipelines and underwater cables; According to the transmission spectrum can be divided into: low-frequency cables (10KHz below) and high-frequency cables (12KHz above). According to the cable core structure can be divided into: symmetrical cable and asymmetric cable two broad categories. Symmetrical cables refer to the cables with the same distribution (mainly referred to as ground distributed capacitance) of the two wires that form the communication loop, such as twisted pair cables. Asymmetrical cables refer to the different distribution parameters of the two wires that form the communication loop , Such as coaxial cable.
According to the cable insulation materials and insulation structure is divided into: solid polyethylene cables, polyethylene foam foam, foam / solid polyethylene insulated cables and polyethylene gaskets and other insulated cables. According to the type of cable sheath can be divided into: Plastic cable, steel wire armored cable, composite sheath cable.
Full-color all-plastic twisted-pair communication cable is now widely used in the local area network cable, the so-called "all plastic" cable refers to: Where the cable core insulation, cable core layer and sheath are made of polymer - - Made of plastic cable. Plastic plastic cable is a broadband symmetrical cable, is now widely used to send telephone, telegraph and data services such as electrical signals.
As the all-plastic cable has excellent electrical characteristics, good transmission quality, light weight, easy transportation and construction, corrosion resistance, less failure, easy maintenance, low cost, economical and practical, high efficiency and long service life, it has been very Fast development and promotion, and its accompanying line technology, such as the laying of the cable, connecting, a variety of end technology, the new line network structure and distribution system, transmission technology and maintenance testing techniques have also been rapid development of.