Cable: when the telephone converts the acoustic sign […]
Cable: when the telephone converts the acoustic signal into the electrical signal, it is transmitted to the switch through the line, and then the telephone signal is transmitted directly to the other phone by the switch through the circuit. The main cable is copper wire. The diameter of the core wire of 0.32mm, 0.4mm and 0.5mm, the larger diameter communication ability is stronger; and according to the number of cores, are: 5, 10, 20 of the 50, 100, and 200 of the on and so on, here comes the log refers to the maximum number of users as well as by cable receiving; the package.
Cable: its size and weight, communication ability is poor, can only be used for short distance communication.
Cable: when the phone signal into electricalsignal through the transmission line to the switch, then switch the signal transmitted to the photoelectric conversion device (converts electrical signals into light signals) to another line (the photoelectric conversion device converts light signals into electrical signals), to exchange equipment, to the other telephone answering. The line between the two photoelectric conversion devices is the optical cable. It is said that it has only the number of core lines, the number of core lines are: 4, 6, 8, 12 pairs, and so on.
Fiber optic cable: it has many advantages, such as small volume, low weight, low cost, large communication capacity and strong communication ability.
Because of many factors, it is only used for long-distance and point to point (that is, the two switching room) communication between the transmission. The difference is that the cable is copper core and the inside of the cable is glass fiber.
Optical fiber communication cable is a certain number of optical fiber, in accordance with a certain way to form a cable heart, wrapped with a sheath, and some also covered the outer protective layer, used to achieve optical signal transmission of a communication line. Field tests have been carried out in Shanghai, Beijing and Wuhan. It was soon used as the inter office trunk line within the local telephone network. After 1984, it was gradually used in long distance lines and began to adopt single-mode optical fiber. Communication cable has larger transmission capacity than copper wire, long relay distance, small volume, light weight, no electromagnetic interference, since the transmission line cable backbone since 1976 has developed into the trunk, the trunk, offshore and trans Pacific submarine communication and local area network, private network, and began to develop the local user loop distribution network field, provide transmission lines for FTTH, wide generation integrated service digital network.
Cable is the cable rope similar by a few or several groups of at least two wires [Each] twisted the mutually insulated wires between each group, and often around a central twisted, the bread has a height of cover insulation; especially the submarine cable first: material difference. The cable is made of metal material (mostly copper and aluminum), and the cable is made of glass fiber as conductor. Second: there is a difference between the transmission signals. The cable carries electrical signals. Optical signals are transmitted by optical cables. Third: there is a difference in the scope of application. Cables are now used for energy transmission and low-end data transmission (e.g., telephone). Fiber optic cables are mostly used for data transmission.http://www.chinacctvproducts.com/