Outdoor optical cable is mainly used for wiring subsystems of building complexes. In the implementation of building complex subsystem wiring, should be selected pipeline cable, only in the case of no other choice, directly buried cable or aerial cable. Let's take a look at the implementation of outdoor optical cable laying.
Outdoor optical fiber laying
Outdoor optical fiber laying is divided into pipeline optical cable laying and directly buried optical cable laying.
Laying of pipeline and cable
1. clean and try.
Before laying the optical cable, the tube hole should be cleaned and tested. When cleaning, use autocratic brush tools, and after cleaning, use a test rod for test check. The inner diameter of the plastic tube should be 1.5 times the outer diameter of the communication cable. When more than two sub-pipes are laid in a cement pipe hole, the equivalent total outer diameter of the sub-pipe should be less than 85% of the inner diameter of the pipe hole.
2. Lay plastic sub-tubes.
When more than two plastic pipes are put through, such as pipes of different colors, the ends can not be marked. If the pipe is of the same color or no color, it should be marked at each end.
3. communication cable brake.
The primary braking length of communication optical cables should be less than 1000m. When the distance is greater than this, the piecewise braking or auxiliary braking mode should be promoted in the middle part to reduce communication cable tension and improve construction efficiency. In order to protect the surface of the communication cable from damage in the braking process, when the communication cable is put into the pipe hole, the corner of the pipe or crossed with other obstacles, the guiding device or bell-mouth protection tube and other protective measures should be selected.
4. Reserve allowance.
After laying communication cables, the communication cables should be placed on the specified support plate in the manhole or hand hole in sequence, and appropriate allowance should be set aside to prevent the communication cables from being too tight. If the communication cable in the manhole or hand hole needs to be connected, the reserved length must meet the minimum value specified in the table.
5. Joint processing.
Communication optical cable in the middle of the pipe hole can not have a joint. When there is no connection of communication cable in the manhole, the communication cable is required to be bent and fixed on the communication cable tray, not directly through the middle of the manhole, otherwise it will affect the construction and maintenance, and will lead to communication cable damage. When communication cables have connectors, use pipes such as serpentine hoses or soft plastic pipes for protection, and fix and bind them on a support plate.
6. Sealing and marking.
The outlet end of the pipe hole through which the communication cable is put should be tightly blocked to prevent water or sundries from entering the pipe. Communication optical cables and their successors must be identified, and indicate the number, cable model and specification, etc. In cold areas should also be carried out anti-freezing methods, to prevent communication cable damage by freezing. In case of communication cable may be damaged, insulation plate can be set up above or around the partition protection.
Laying of directly buried optical cable
1. Embedding depth.
Directly buried optical cable because directly buried in the ground, so, must have a certain distance with the ground, with the help of the tension of the ground, so that the communication cable is not damaged, at the same time, should also ensure that the communication cable is not frozen.
2. communication cable ditch cleaning and backfilling.
Ditch bottom should be flat, no gravel and hard stones and other obstacles to communication cable laying sundry. If the trench is stone or semi-stone, the bottom of the trench should also bedding 10cm thick fine soil or sand and copy level. After laying communication cables, backfill 30cm thick fine soil or sand as a protective layer. Do not infiltrate gravel, bricks, and hard stones into the protective layer. The protective layer should be gently stroked manually.
3. Communication optical cable laying.
When laying communication optical cables or cables in the same ditch, brake cables should be laid at the same time. If it is laid in the same trench as the directly buried cable, the cable should be laid first, then the communication optical cable, and arranged in parallel at the bottom of the trench. As for laying communication optical cables in ditches, they should be laid at the same time and cannot be crossed or overlapped at the bottom of ditches. Communication cable should be flat at the bottom of the ditch or natural bending to release the stress of communication cable, such as bending or arch, should try to put flat, but absolutely can not choose to step on the hard way.
The joint, turning point, reserved length or junction with other pipelines should be marked for future maintenance. Signs can either use arbitrary signs, or borrow a permanent building near the cable, measure the distance between a part of the building and the cable, and record for future reference.
In integrated cabling, the main factors affecting signal attenuation are internal factors and external factors. The attenuation of internal factors is related to fiber material, which can be achieved by purchasing high-quality fiber products. And the external factors are related to the construction of optical fiber wiring, because the construction of the shop, the optical fiber due to deformation, fiber and light source coupling loss and connection loss between the optical fiber, this can be reduced in the construction process.