What is a flame-retardant optical cable for mining applications?
Structure
It is divided into: a) Central tube type (2-12 cores, due to process limitations, this process can only produce up to 12 cores)
b) Stranded type (2-144 cores, generally using a central tube type for cables with less than 12 cores)
1. Central tube type: From inside to outside: optical fiber, fiber optic paste, loose tube, fine steel wire (multiple strands wrapped in a loop), steel tape, PE inner sheath, flame-retardant jacket (blue)
2. Stranded type: From inside to outside: central reinforcement (typically phosphated steel wire), optical fiber, fiber optic paste, loose tube, cable tie, cable paste, steel tape, PE inner sheath,
Flame-retardant jacket (blue)
The structure of a flame-retardant optical cable for mining applications consists of a single-mode or multimode optical fiber enclosed in a loose tube made of high-modulus plastic, filled with a water-blocking compound. The cable core consists of a phosphated steel wire or polyethylene-extruded steel wire rope. Loose tubes (or filler rope and signal cable) are twisted around the central reinforcement core to form a compact, round cable core. The gaps within the cable core are filled with a water-blocking filler, followed by a steel-polyethylene bonded inner sheath, and then a blue flame-retardant PVC sheath.
Specifications
Central Beam Tube MGTSV Mining Fiber Optic Cable (2-12 Cores)
Cable Outer Diameter: 11.4mm, Cable Weight: 190kg/km, Minimum Bend Radius: 120° (Static) / 240° (Dynamic), Tensile Strength: 1500N (Short-Term) / 600N (Long-term) Crush Resistance: 1000N/100mm
Stranded MGTSV Mining Fiber Optic Cable (2-72 Cores)
1. 2-30 Cores
Cable Outer Diameter: 12.7mm, Cable Weight: 180kg/km, Minimum Bend Radius: 160° (Static) / 320° (Dynamic), Tensile Strength: 1500N (Short-term) / 600N (Long-term), Crush Resistance: 1000N/100mm
2. 32-60 Cores
Cable Outer Diameter: 13.9mm, Cable Weight: 240kg/km, Minimum Bend Radius: 17 0 (static) / 340 (dynamic), Tensile Strength: 1500N (short-term) / 600N (long-term), Crush Resistance: 1000N/100mm
3. 62-72 Cores
Cable Outer Diameter: 15.1mm, Cable Weight: 286kg/km, Minimum Bend Radius: 190 (static) / 380 (dynamic), Tensile Strength: 1500N (short-term) / 600N (long-term), Crush Resistance: 1000N/100mm
Categories and Characteristics
1. Based on the characteristics of the optical fiber (glass or plastic fiber) within the transmission medium of the optical cable, : Single-mode fiber and multimode fiber.
2. Mining optical cables are further divided into single-mode and multimode cables based on the characteristics of the selected optical fiber.
3. Single-mode (B): Indicates a conductor slightly thicker than a human hair (commonly known as glass fiber) that transmits only a single wavelength (frequency) in the medium (usually silica, i.e., glass).
Main characteristics: brittle, easily broken, and tough (highly tensile strength). Its mechanical properties are almost opposite to those of a human hair. The characteristics of other components of the medium can lead to inconsistencies in optical transmission performance. Single-mode fiber is further subdivided into: B1.1 (non-dispersion-shifted single-mode fiber). ITU-T G652) and B4 (non-zero dispersion-shifted single-mode fiber ITU-T G655). Generally, the wavelengths used are 1310nm or 1550nm. Currently, the most commonly used single-mode fiber is B1.1. Sometimes, the abbreviation "B" simply represents B1.1 (a non-standard designation).
4. Multimode A1 (ITU-T G651): This indicates that multiple wavelengths (frequencies) can be transmitted simultaneously in this medium (which is single-mode). The conductor, slightly thicker than a human hair (commonly known as the same), has the following main characteristics: brittle, easily broken, and tough (highly tensile strength). Its mechanical properties are almost the opposite of those of a human hair. The characteristics of other components of the medium can lead to inconsistencies in optical transmission performance. Multimode fiber is further subdivided into A1a and A1b, collectively referred to as ITU-T G651. The commonly used wavelengths are 1310nm or 850nm.
5. Fiber Optic Transmission Distance
Typically, single-mode transmission without a repeater can reach 120km, while multi-mode transmission can reach 2km. 10/100/1000M optical signals can generally reach 60-80km in single-mode transmission without a repeater. Multi-mode transmission can reach 50/125µm for 500m and 62.5/125µm for 200m. Therefore, multi-mode is generally used indoors or for patch cables, while single-mode is used outdoors for long-distance transmission.
