The difference between the cable and the optical cable

Cable: when the unit will sound signal into electrical signal through the line after the transfer to the switch, and then by the switch by lines will signal directly to the other telephone answering a call, the process of transmission lines is cable. The inside of the cable is mainly copper core wire. The diameter of the core wire with 0.32mm, 0.4mm and 0.5mm points, the greater the diameter of communication ability is stronger; and according to the core line number, are: 5, 10, 20 of of of, 50, 100, 200 of of of and so on, here refers to the maximum number of users log cable hold and press; packing, this I do not know. Cable: the volume, weight, communication ability, can only be used for short distance communication. Cable: when the unit will sound signal into electrical signal through the line after the transfer to the switch, and then by the switch will this electrical signal is transmitted to the photoelectric conversion device (converts electrical signals into light signals) to another photoelectric conversion device by lines (convert optical signals into electrical signals), then to switching equipment, to the other telephone answering. In between the two photoelectric conversion device is the optical cable line. With that number it only core line of the points, the core line number: 4, 6, 8, 12 and so on. Cable: its volume, small weight, low cost, large communication capacity, the advantages of good communication. Because of many factors, it is only used for long distance and from point to point (i.e. two switching) communication between. The difference between them is: inside the voice patch panel copper core wires; cables inside the glass fiber. Optical fiber communication cable is a certain amount in a certain way to form the cable core, a sheath of outsourcing, and some also covered the outer protective layer, with a line of communication to achieve the optical signal transmission. Once successively in Shanghai, Beijing, Wuhan and other places to carry out field test. Soon after in the local telephone network as interoffice trunk trial, after 1984, gradually for the long-distance lines, and start using single-mode fiber. Communication cables with a transmission capacity greater than copper wire cable, relay section of long distance, small volume, light weight, no electromagnetic interference, since the cable transmission line shaft after 1976 has developed into the trunk, intracity relay, offshore and transoceanic submarine communication and local area network, private network and so on, and began to develop the city user loop distribution network field, provide transmission lines for fiber to the home, width generation integrated service digital network. 12 port patch panel are usually similar to the rope cable by a few or several sets of wires [Each] and twisted by at least two mutually insulated wire, between each group, and often revolve around a central twisted, the entire outer covering layer of bread with highly insulated submarine cable; specified first: distinguish the material. Cable with metal material (mostly copper, aluminum) for conductors; cable with glass fiber as the conductor. Second: is there a difference transmission signal. Cable transmission is a signal. Optical fiber transmission is optical signal. Third: there is a difference between the scope of application. The cables are used for energy transmission and low data transmission of information (such as telephone). Cable used for data transmission.