FTTH has experienced more than a decade of development and related technologies have matured. A complete FTTH system not only includes the system node equipment, but also includes the optical fiber and optical fiber cable between the node equipment, and the optical line auxiliary facilities. According to relevant data analysis, 20% of FTTH system faults are caused by lines.
FTTH floor wiring, butterfly-shaped fiber optic cable introduction of the most widely used, it has a small size, light weight, convenient connection and other characteristics, low-rise buildings generally use butterfly-shaped fiber optic cable is introduced directly to the user's home. When the floor is high, the construction party often uses the outdoor optical cable to directly introduce the building from outside the building, lays it vertically along the shaft, and then reaches the floor sub-fiber box and then introduces the optical cable horizontally into the room with a butterfly. There are many hidden dangers in this way. Take the most commonly used GYTA outdoor optical cable as an example:
1. The loose tube of the outdoor optical cable contains ointment, which plays a role in waterproofing and protecting the optical fiber. The GYTA fiber optic cable is used as a vertical wiring. After a few years, the ointment in the optical cable will generate a drop due to gravity, and the loss of the optical fiber after the protection is lost will affect the service life of the optical fiber. At the same time, the ointment from the drop of the optical cable is stored in the optical fiber splitter box and mixed with dust to contaminate the wiring facilities.
2. Outdoor optical cables generally have a metal armor layer. For example, GYTA fiber optic cable has a layer of aluminum tape armor, and the center has a metal reinforcement member. The metal components are directly introduced into the room, and they are easily led into the room.
3, outdoor optical fiber hardness, difficult to bend indoors; peeling the outer sheath requires special tools, the metal sheathing material is not easy to peel; at the same time taking into account the factors such as ointment in the cable, increased the difficulty in the indoor construction.
4. The outer sheath of an ordinary outdoor cable is generally not flame-retardant material, and cannot achieve the flame retardant rating of the indoor wiring, which may easily cause fire safety hazards.
In YD/T1636-2007 “FTTH Architecture and General Requirementsâ€, there is a clear provision for the selection of optical cables that enter a building: “When an optical cable is required to enter the room from the outside, indoor and outdoor optical cables can be used to directly enter the room. The outdoor optical cable can be used to directly enter the room in a metal pipeline with good grounding protection. If there is no metal pipeline protection, the application distance of the outdoor optical cable in the room should not exceed 15m. In practice, due to the high cost of the metal pipeline, It will not be used under the circumstances, and the distance of the outdoor cable to the home far exceeds the length of 15m.
Due to the increasing number of high-rise buildings, the amount of optical cables for indoor vertical wiring is also rapidly increasing. If outdoor cable is still used for indoor vertical wiring, it will inevitably cause great security risks. In recent years, the Ministry of Housing and Urban-Rural Development has continued to intensify the safety regulations for residential buildings and has implemented more and more enforcement. The related products that are associated with construction facilities must implement strict safety regulations. At the same time, operators have more thorough and thorough understanding of industry norms and their infrastructure has been gradually standardized. More and more regions will adopt indoor multi-core optical cables for FTTH vertical wiring in accordance with industry specifications.
FTTH floor wiring, butterfly-shaped fiber optic cable introduction of the most widely used, it has a small size, light weight, convenient connection and other characteristics, low-rise buildings generally use butterfly-shaped fiber optic cable is introduced directly to the user's home. When the floor is high, the construction party often uses the outdoor optical cable to directly introduce the building from outside the building, lays it vertically along the shaft, and then reaches the floor sub-fiber box and then introduces the optical cable horizontally into the room with a butterfly. There are many hidden dangers in this way. Take the most commonly used GYTA outdoor optical cable as an example:
1. The loose tube of the outdoor optical cable contains ointment, which plays a role in waterproofing and protecting the optical fiber. The GYTA fiber optic cable is used as a vertical wiring. After a few years, the ointment in the optical cable will generate a drop due to gravity, and the loss of the optical fiber after the protection is lost will affect the service life of the optical fiber. At the same time, the ointment from the drop of the optical cable is stored in the optical fiber splitter box and mixed with dust to contaminate the wiring facilities.
2. Outdoor optical cables generally have a metal armor layer. For example, GYTA fiber optic cable has a layer of aluminum tape armor, and the center has a metal reinforcement member. The metal components are directly introduced into the room, and they are easily led into the room.
3, outdoor optical fiber hardness, difficult to bend indoors; peeling the outer sheath requires special tools, the metal sheathing material is not easy to peel; at the same time taking into account the factors such as ointment in the cable, increased the difficulty in the indoor construction.
4. The outer sheath of an ordinary outdoor cable is generally not flame-retardant material, and cannot achieve the flame retardant rating of the indoor wiring, which may easily cause fire safety hazards.
In YD/T1636-2007 “FTTH Architecture and General Requirementsâ€, there is a clear provision for the selection of optical cables that enter a building: “When an optical cable is required to enter the room from the outside, indoor and outdoor optical cables can be used to directly enter the room. The outdoor optical cable can be used to directly enter the room in a metal pipeline with good grounding protection. If there is no metal pipeline protection, the application distance of the outdoor optical cable in the room should not exceed 15m. In practice, due to the high cost of the metal pipeline, It will not be used under the circumstances, and the distance of the outdoor cable to the home far exceeds the length of 15m.
Due to the increasing number of high-rise buildings, the amount of optical cables for indoor vertical wiring is also rapidly increasing. If outdoor cable is still used for indoor vertical wiring, it will inevitably cause great security risks. In recent years, the Ministry of Housing and Urban-Rural Development has continued to intensify the safety regulations for residential buildings and has implemented more and more enforcement. The related products that are associated with construction facilities must implement strict safety regulations. At the same time, operators have more thorough and thorough understanding of industry norms and their infrastructure has been gradually standardized. More and more regions will adopt indoor multi-core optical cables for FTTH vertical wiring in accordance with industry specifications.
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