As a kind of insulated cable, the aerial fiber optic cable is suspended in the air from poles and/or support structures. It is often supported between poles by being lashed to a wire rope messenger strand with a small gauge wire. And since optical cable is a high capacity transport medium that is sensitive to excessive tensile force, tight bends, and crushing forces, some care must be taken during the installation procedure to respect these limitations. This article will take a brief introduction to aerial fiber optic cable installation via several diagrams.
Before the project, the aerial fiber line construction shall be worked out in details. This is intended to determine if any work may be required along the proposed route before cable placement begins.
- 7 m poles are for ground application, 6 m poles are for mountain application, 8 m poles are for cross-road application
- Auxiliary messenger wire are required when the pole spacing is over 80 m
- The standard pole spacing shall be less than 60 m
- Each pole shall be in a line (deviation less than 5 cm)
As you can see from the following picture, there are many assemblies that are attached to the pole such as cable storage assembly, fiber optic splice closure and so on. These devices play really play important roles in the aerial cable line, therefore it is necessary to have an understanding to them.
- large-scale buildings, downtown areas and development zones
- Damages may be caused to the underground structures
- Unsafe places
Generally, there are five steps for installing aerial fiber optic cable：setting pole, fixing pole guy, constructing messenger wire, installing fiber optic cable and line protecting (as shown in the following figure):
Since the cable route is usually very long, the connection of messenger wires is an essential part in the aerial cable project. Iron wires with 3.0 cm diameter are often used to wind on the connection point of the messenger wires. And there are generally two methods to complete the winding (as shown in the following figure). The following picture shows the details of messenger wire connection:
Just as the messenger wires, the fiber optic cables need to be spliced in the fiber optic splices near the poles as well.
- Pulleys shall be installed every 25 m on the messenger wire before the placement
- Blocks shall be installed at the cable pulling location
Many FTTH (fiber to the home) projects are achieved through the aerial fiber optic cable. And there are two ways that fiber cables are introduced into a house: from the underground pipeline into the house and from the orifice plate outside the house (as shown in the following figure).
Compared with buried cable or fiber in-duct solution, aerial optical cable solution is typically faster and less expensive to deploy than digging, particularly for backbone fiber. But installing aerial fiber optic cable is also a risky job. Thus, it is necessary to have the knowledge of aerial fiber optic cable installation.
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