The inside of the cable is copper core wire; the inside of the fiber optic cable is glass fiber. A cable is usually a rope-like cable made of several or groups of conductors, each group of at least two twisted. The optical cable is a communication line in which a certain number of optical fibers form a cable core in a certain way, and is covered with a sheath, and some are also covered with an outer sheath to realize optical signal transmission.
When the phone converts the acoustic signal into an electrical signal and then transmits it to the switch through the line, and then the switch directly transmits the electrical signal to another phone for answering through the line. The line transmitted during this call process is the cable.
When the phone converts the acoustic signal into an electrical signal, it is transmitted to the switch through the line, and then the switch transmits the electrical signal to the photoelectric conversion device (converts the electrical signal into an optical signal) and transmits it to another photoelectric conversion device (converts the optical signal) through the line to another photoelectric conversion device. The signal is converted into an electrical signal), and then to the switching device, and then to another phone to answer. The line between the two photoelectric conversion devices is the optical cable.
The cable is mainly copper core wire. The diameter of the core wire is divided into 0.32mm, 0.4mm and 0.5mm. The larger the diameter, the stronger the communication ability; there are also points according to the number of core wires: 5 pairs, 10 pairs, 20 pairs, 50 pairs, 100 pairs, 200 pairs Right wait. Optical cables are only divided into the number of core wires, and the number of core wires are: 4, 6, 8, 12 pairs and so on.
Cable: Its volume, weight are large, and its communication ability is poor, so it can only be used for short-distance communication. Optical cable: It has the advantages of small size and weight, low cost, large communication capacity, and strong communication ability. Due to many factors, it is currently only used for long-distance and point-to-point (that is, two exchange rooms) communication transmission.
The difference between cable and optical cable
In fact, the difference between cables and optical cables is mainly manifested in three aspects.
First: There is a difference in material. Cables use metal materials (mostly copper, aluminum) as conductors; optical cables use glass fibers as conductors.
Second: There is a difference in the transmission signal. Cables carry electrical signals. Optical cables transmit light signals.
Third: There are differences in the scope of application. Cables are now mostly used for energy transmission and low-end data information transmission (such as telephone). Optical cables are mostly used for data transmission.
In practical application, it can be known that the optical cable has a larger transmission capacity than the copper cable, the trunk distance is long, the volume is small, the weight is light, and there is no electromagnetic interference. It is the backbone of wired transmission lines for ocean-submarine communications, local area networks, private networks, etc., and has begun to develop into the field of urban user loop distribution networks, providing transmission lines for fiber-to-the-home and broadband integrated service digital networks.
