How many types of fiber optic cable how to categorize?

Solid cable: The exterior is made of lead (Pb) as a protective shell, and the interior is made of insulating oil-soaked paper wrapped around the conductor and filled with filler such as jute in the voids. Since the void inside the lead layer is filled with filler, it is called solid cable. Three types of cables are described below: Ribbon cable: the conductor is a round, semi-circular or fan-shaped soft copper wire, the outer roll of insulation paper to be stranded. Then fill in the gaps with filler. Outside the insulating paper wrapped, soaked in insulating oil, and then covered with a lead layer. These cables are used for transmission and introduction lines up to 10kV. SL cable: Insulating paper is wrapped around each round core and then covered with a lead layer. The direction of electric field is perpendicular to the insulation layer, which increases the insulation endurance and is suitable for power transmission of 20kV ~ 30 kV level. It is suitable for 20kV ~ 30 kV transmission and has good cooling effect. H cable: Metallized paper is rolled on the insulating core, twisted into a round shape with the liner, and then covered with a lead layer. It is lighter in weight than SL cable, with good cooling effect, and can be used for power transmission of 30 kV. Oil-filled cable: As the solid cable appearance of the lead cladding is an inelastic rigid body. Therefore, when the temperature rises, the lead layer expands and shrinks incompletely after cooling, easily creating voids within the insulation layer, causing local high-voltage discharges and leading to insulation degradation. For this lack, can be filled with an atmospheric pressure in the cable above the insulating oil, can effectively inhibit the generation of voids, so the pressure resistance increases. It is called oil filled cable (oil filled cable), or OF cable for short. It can be used in high voltage range of 66~154KV. Since it is often used for long-distance power transmission, an oil-filled station should be set up at an appropriate distance to maintain the oil pressure inside the cable. Pressure cable : The insulated core wire is placed in a steel tube and then filled with nitrogen, hydrogen or insulating oil at 12~14 atmospheres, which can inhibit partial discharges caused by bubbles or voids in the insulator, resulting in the deterioration of the insulating material. Its destructive voltage is about twice as much as that of ordinary cables, and it is suitable for ultra-high voltage underground transportation cables above 44KV. Synthetic resin cable: Polyethylene is used for the insulation layer, and PVC is used as the protective layer on the outermost part, also known as EV cable. If cross-linked polyethylene instead of polyethylene, it is called CV cable. This type of cable has a low dielectric breaking strength and is not suitable for high voltage applications. Due to their light weight, they are gradually replacing solid cables for low voltage applications. Telecommunication cables Telecommunication cables are mainly used for transmitting digital or analog signals with low voltage and current, so the main requirements are to avoid noise interference and to attenuate signals at high frequencies.... For example, the electrostatic capacity between cores should be small, and the cores should be configured to avoid electrostatic induction within the circuit. Telecommunication cables can be categorized according to their use: Domestic cables: Insulated soft copper wires are used for the core wires, and two core wires are twisted back and forth, which is called twisting. Or two groups of two core wires to make a square stranded, known as the star-shaped square strand. Because the round-trip current is opposite, can prevent electrostatic induction occurs. The plastic insulation used for the core wires is also identified by color. Multiple pairs of stranded wires or star-shaped square strands are stranded in layers to form a concentric circular arrangement, plus insulating paper tape winding, and finally protected by a lead layer. This type of cable is mainly used in the city telephone joining line, and telephone branch office of the trunk line. Outside the city cable: the use of copper wire thicker than the city cable as the heart of the line, with fine paper winding each other, and then insulating paper rolled into a group of wires. Multiple groups of wires are then twisted together in concentric cylinders. The outer insulating paper tape is wound and finally protected by a lead layer. Depending on the stranding method, it can be divided into three kinds of cables, such as the heavy message cable using DM square stranding, the star-shaped cable with the same structure as the municipal star-shaped cable outside the city, and the transmission cable with four wires stranded in the shape of a star square stranding. These cables are mainly used for telephone lines between cities and long-distance communication lines. Local cables: The enameled wire is wound with colored stranded wires to form a heart wire. In the 2 or 3 stranded wire stranded into a unit cable. The core wire can also be made of vinyl resin, and the outer layer is then coated with vinyl resin. This is known as PVC localized cable. The process is simple, and it is moisture-resistant and non-flammable. Generally used in telecommunication bureaus, the connection of various machines. High-frequency cables: Mainly in the transmission of high-frequency signals. In terms of construction, can be distinguished into the following two coaxial cable: internal hollow cylindrical conductor, external another, the insulation between the inner and outer conductor is polyethylene, the outer insulator is polyvinyl chloride. Balanced cable: generally used for television signal transmission video cable, in order to avoid high-frequency attenuation, a pair of conductors stranded, insulated with foamed polyethylene, the outside is still the same as the coaxial cable is applied to the same avoidance. The cable impedance in 1252.5, can be used to 6MHz, attenuation constant of 11~13dB/km. Submarine cables: These cables in addition to the general characteristics of communication cables, but also must have a waterproof pressure (water pressure) and other characteristics. According to its use can be divided into dry leaded paper cable and lead-free cable two kinds: dry leaded paper cable: soft copper wire for the core line, the cable inserted into the center of the aluminum foil for the line of static avoidance, in order to prevent leakage. Both ends of the cable with copper and iron tape coiled to avoid electromagnetic fields. There are two layers of aluminum cladding on the surface for tight waterproofing. The outer layer of lead is covered with rubber. This type of cable is not suitable for deep sea, but can accommodate more lines. Lead-free cables: Use soft copper wire or stranded wire for the core and GP rubber (gutta percha) for insulation. Highly conductive alloys are cut into ribbons and coiled around the conductors to maintain transmission capacity. It can accommodate fewer circuits, but is suitable for deep-sea applications. Fiber optic cables: light to transmit signals, the advantages of many, is now gradually replace the traditional telecommunications cables.