Difference between communication cable and optical cable

Cable:

When the telephone converts the acoustic signal into electrical signal, it is transmitted to the switch through the line, and then the electrical signal is directly transmitted to another telephone by the switch through the line to answer, the line of this communication process transmission is the cable. The cable is mainly copper core. The core wire diameter is 0.32mm, 0.4mm and 0.5mm, the larger the diameter is, the stronger the communication ability is; there are also five pairs, 10 pairs, 20 pairs, 50 pairs, 100 pairs, 200 pairs, etc. according to the number of core wires, the logarithm here refers to the maximum number of users that the cable can accommodate; there are also sub packages, which I don‘t know very well. Cable: it has large volume, weight and poor communication ability, so it can only be used for short distance communication.

Optical cable:

When the telephone converts the acoustic signal into an electrical signal, it is transmitted to the switch through a line, and then the electrical signal is transmitted to the photoelectric conversion device (converting the electrical signal into an optical signal) by the switch to another photoelectric conversion device (converting the optical signal into an electrical signal) through a line, and then to the switching device and to another telephone for listening. The line between the two photoelectric conversion devices is the optical cable. It can only be divided into the number of core wires. The number of core wires includes: 4, 6, 8, 12 pairs, etc. Optical cable: it has the advantages of small volume, 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 communication transmission.

The difference between them: the inside of the cable is copper core; the inside of the cable is glass fiber.

Communication optical cable is a kind of communication line that a certain number of optical fibers constitute the cable core in a certain way, which is covered with a sheath and some with an outer sheath to realize optical signal transmission. In 1976, bell Research Institute of the United States built the first optical fiber communication experimental system in Atlanta, using 144 optical fiber cables made by Western Electric companies. In 1980, commercial optical cables made of multimode optical fibers began to be used in inter office trunk lines and a few long-distance lines in the city. Commercial optical cable made of single-mode optical fiber has been used in long-distance line since 1983. In 1988, the first transatlantic submarine cable between the United States and Britain and France was successfully laid, and soon the first transatlantic submarine cable was built. In 1978, China developed its own communication optical cable, which uses multimode optical fiber and the core structure is layer stranded. He has successively carried out field tests in Shanghai, Beijing, Wuhan and other places. After that, it was used as inter office trunk line in the local telephone network. After 1984, it was gradually used in long-distance lines and began to use single-mode optical fiber. Communication optical cable has larger transmission capacity than copper cable, with long distance, small volume, light weight and no electromagnetic interference in the relay section. Since 1976, it has developed into the backbone of long-distance trunk line, local relay, offshore and cross ocean undersea communication, as well as local area network, private network and other cable transmission lines, and began to develop into the field of local user loop distribution network, for fiber to home, wide generation The integrated services digital network provides transmission lines.

A communication cable is usually a rope like cable composed of several or several groups of conductors [at least two in each group], each group of conductors is insulated from each other, and is usually twisted around a center, with a highly insulated covering over the whole cable; especially a submarine cable

First, there are differences in materials. The cable is made of metal (mostly copper and aluminum) as the conductor; the optical cable is made of glass fiber as the transmission conductor.

Second, there are differences in transmission signals. The cable carries electrical signals. Optical cables transmit optical signals.

Third, there are differences in the scope of application. Cables are mostly used for energy transmission and low-end data information transmission (such as telephone). Optical cables are mostly used for data transmission