As the global telecommunications network develops towards digitalization, broadband and intelligence, the construction of optical fiber user access networks with large-capacity ribbon optical cables as the main transmission media is accelerating. However, there are certain differences in the construction technology between large-capacity ribbon optical cables and single-core relay optical cables. 1. Application of large-capacity ribbon optical cable longitudinal breaking (referred to as skylight) technology In the past, optical cables were mostly used as relay optical cables, and the possibility of requiring branch joints was very small. The characteristics of ribbon optical fiber user access networks are that there are many user exchange points and the exchange points are close, which leads to many optical cable branch joint points. In order to maintain the integrity of the optical fiber that does not need to be branched in the optical cable, when the optical cable is equipped, the whole tray configuration is often used. At the location where the branch joint is required, a certain amount of optical cable is left, and the large-capacity ribbon optical cable longitudinal breaking (skylight) technology is used for connection. The ribbon cable longitudinal breaking technology refers to the process of longitudinally breaking the outer skin and sheath of the large-capacity ribbon optical cable from the location where the branch joint is required according to the required size under the premise of adopting the whole-reel configuration when the optical cable is equipped. Then, the outer skin and sheath of the optical cable are longitudinally broken with a special longitudinal breaking knife or surgical scissors to longitudinally open the central bundle tube, remove the central bundle tube, cut the fiber ribbon required for branching, and connect it with the fiber ribbon of the branch optical cable, and retain the fiber ribbon that does not need to be branched and store it. The application of this technology can reduce the splicing loss in the optical cable relay section, reduce the probability of optical fiber failure, reduce the labor intensity of construction personnel, and save the cost of machinery use and splicing materials. This technology was first used and successfully in the test ring of the user optical cable network (southwest ring) of Beijing Zhongguancun Telephone Bureau. In 1998, it was widely promoted and used in the construction of 100 optical cable rings in Beijing, achieving significant economic benefits and social efficiency.
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