There are many requirements for laying direct-buried optical cables, and the direct-buried depth of optical cables is one of them. We all know that the attenuation of optical fiber signals in integrated wiring requires special attention. In fact, there are two reasons that affect the attenuation of optical fiber signals, namely internal factors and external factors. Many friends have a lot of doubts about the laying requirements of direct buried optical cables. Let's take a look at the matters that need to be lived in the laying of direct buried optical cables.
Direct Buried Optical Cable Laying Requirements
Laying of direct buried optical cable
1. Buried depth. Since the direct buried optical cable is directly buried under the ground, it must have a certain distance from the ground. With the help of the ground tension, the optical cable is not damaged. At the same time, it should also be ensured that the optical cable is not damaged by freezing.
2. Cleaning and backfilling of optical cable trenches. The bottom of the ditch should be flat and free of debris such as gravel and hard clods that hinder the laying of optical cables. If the trench is stony or semi-stony, 10cm thick fine soil or sand should be laid at the bottom of the ditch and leveled. After the optical cable is laid, 30cm thick fine soil or sand should be backfilled as a protective layer. It is strictly forbidden to mix gravel, bricks, hard soil blocks, etc. into the protective soil layer. The protective layer should be gently stepped on manually.
3. Optical cable laying. When laying optical cables or cables in the same trench, they should be pulled and laid separately at the same time. If it is laid in the same trench as the direct buried cable, the cable should be laid first, and then the optical cable should be laid in parallel at the bottom of the trench. Just like laying optical cables in trenches, they should be laid separately at the same time, and should not be crossed or overlapped at the bottom of the trench. The optical cable should be laid flat at the bottom of the trench or bent naturally to release the stress of the optical cable. If it is bent or arched, try to lay it flat, but it is absolutely not allowed to use strong methods such as stepping on the foot.
4. Identify. Marks should be set up at the joints, turning points, reserved lengths, or intersections with other pipelines of directly buried optical cables for future maintenance. The sign can either use an autocratic sign, or borrow a permanent building near the optical cable, measure the distance between a certain part of the building and the optical cable, and record it for future reference.
When laying optical fibers, you should pay attention to:
1. The minimum bending radius cannot be exceeded when bending the optical cable.
2. The traction force for laying optical cables should not exceed the maximum laying tension. At the same time, the external force (side pressure, impact, bending, twisting, etc.) should be avoided to subject the optical fiber to the transition.
3. The termination and maintenance of the optical fiber should be performed by strictly trained technicians. When the optical cable is used in the backbone, at least 6-core optical cable should be used in the wiring room of each floor, and 12-core optical cable should be used for advanced applications. This is considered from three aspects: application, backup and expansion. As for the networking mode of optical fiber, it is also very flexible. can be realised:
A, point-to-point: establish a high-speed channel between two computers. The transmission rate is several Mbps to several hundreds of Mbps, and the distance can be up to 2 km (multimode) to 5 km (single mode).
B. Star network: establish a star network topology through optical fiber network equipment.
C. Ring network: The signal regenerator is connected by optical fiber to form a loop.
External factors are related to the construction of optical fiber cabling, because during construction, the optical fiber is caused by deformation, coupling loss between the optical fiber and the light source, and connection loss between the optical fibers, which can be reduced during the construction process.
