Method for laying optical fibers in horizontal areas in integrated wiring

Integrated wiring: The optical cable laying method is as follows:

1.The diameter of the mode field of the same batch of optical fibers is basically the same, and after the fiber is disconnected at a certain point, the mode field between the two ends can be regarded as the same, so the influence of the mode field diameter on the optical fiber splicing loss can be minimized by splicing at this disconnection point. Therefore, optical cable manufacturers are required to use the same batch of bare fibers for continuous production according to the required length of the optical cable, numbering them sequentially on each plate, and marking the A (red) and B (green) ends respectively, and no skipping numbers.

When erecting optical cables, they need to be deployed along the determined routing sequence according to the number, and ensure that the B end of the front optical cable is connected to the A end of the next optical cable, so as to ensure that the diameter of the die field on the end face of the two optical fibers is basically the same when splicing, so that the fusion loss value is minimized.

2.Overhead fiber optic cables can be used 7?The galvanized steel strand is used as a hanging wire for hanging fiber optic cables.

The hanging wire and optical cable should be well grounded, and there should be lightning and electricity protection measures, and there should be shockproof and windproof mechanical properties. The horizontal and vertical distance between the overhead hanging line and the power line should be more than 2m, the minimum height from the ground should be 5m, and the minimum distance from the roof should be. There are 3 types of hanging types of overhead optical cables:

Hanging wire bracket type, hanging wire winding type and self-supporting type. The self-supporting type does not use steel strand hanging wire, the optical cable sags, and the wind load is poor, so the hanging type is commonly used.

3.Overhead fiber optic cable deployment. Since the reel length of the fiber optic cable is much longer than the cable, and the length may be up to several kilometers, it is limited by the allowable rated tensile force and bending radius, and special attention is paid to the phenomenon of not jerking and kinking during construction.

Generally, the allowable tensile force of the optical cable is about 150 200kg, and the bending radius of the optical cable should be greater than or equal to 10 15 times of the outer diameter of the optical cable when turning, and the bending radius should be greater than or equal to 20 times when the construction is deployed. In order to avoid that the optical cable is placed in the middle of the road section, about 20m away from the pole, erected in the opposite direction, the first half of the roll is erected, and the second half of the roll of the fiber optic cable is put down from the plate, and then placed on the ground in the "8" shape, and then deployed.

4.When the optical cable is deployed, it is strictly forbidden to make small circles and fold and twist the optical cable, and it is necessary to be equipped with a certain number of walkie-talkies, and the cable release method of "walking forward and heeling, and the optical cable on the shoulder" can effectively prevent the occurrence of the back buckle, and also pay attention to the uniform force, the traction force does not exceed 80% of the optical cable, and the instantaneous maximum traction force does not exceed 100%.

5.In addition, when erecting, there should be a special person responsible for the turning of the optical cable or the place where the terrain is more complicated, and it is strictly forbidden for the vehicle to run over. Use a pulley vehicle to lay the optical cable overhead, and hang the pulley in advance on the pole and hanging line (generally one pulley is hung every 10 20m), and reduce the sag and reduce the tension at the pulley and the pulley on the optical cable.

Then wear the tow rope between the pulleys, tie the tow rope to the traction head of the optical cable, and use a certain traction force to make the optical cable climb the pole and hang it on the hanging line.

6.The spacing of the optical cable hook is 40cm, the hook on the hanging line buckle direction should be consistent, each pole should have a convex drip ditch, and each optical cable should have a margin of 3m of rod length plus 3m at the joint, so as to facilitate the ground welding operation of the splice box, and there should be a certain amount of disk retention every few hundred meters.

Choice of multimode and singlemode fiber for integrated cabling.

1. Classification of optical fibers.

Optical fibers can be divided into single-mode and multi-mode fibers according to their characteristics, and can be divided into indoor optical fibers and outdoor optical fibers according to their usage scenarios.

As you can see from the figure above, the core diameter and outer diameter of multimode fiber and singlemode fiber are different.

Outdoor optical cables include armored, metal optical cables, heavily armored optical cables, non-metallic optical cables, etc.

Comparison of the structure of metal fiber optic cable and Chongkai fiber optic cable.

Indoor optical cables are divided into single-core single-mode, double-core multi-mode, multi-core multi-mode, etc.

2. How to choose optical fiber single-mode and multi-mode.

In scenarios where the distance between the front and back ends exceeds 2 km, only single-mode optical modules can be used, because the maximum transmission distance of multi-mode optical modules is 2 km (the rate is 155 m).

There is no clear distinction between single-mode and multi-mode, and the most suitable choice for the scene is to do a good job, and distance is the most direct reference standard for choosing single-mode and multi-mode.

Integrated wiring is the basis of the weak current system, and weak current people need to master the various subsystems of the integrated wiring, the terminology of the integrated wiring and the laying method of the integrated wiring in the weak current drawings.

The number of fibers you choose is entirely up to your own equipment room. For example, you only need to do interconnection between your two central office computer rooms, then 2 cores are enough, but generally use 12 cores, redundant cores are used as backups, redundant fibers of different lines are used, the number of cores is the same, core-convergence-access between each other I think it is enough to use 2 cores (but generally 12 cores, used as backup). When using a switch with an optical port, you need to buy an optical module, and you don't need a transceiver, and then you must pay attention to the purchase of optical jumpers, which are divided into single-mode and multi-mode, and there are many types of ports.

If you still have any questions, I'll do it.

1. Grinding.

2. Welding. 3. Cold connection.

At present, optical fiber has been indispensable in the integrated wiring system, optical fiber has the advantages of anti-interference, communication security and high-speed transmission, and the market demand is wide.

Optical fiber and cable and other related best choice of high quality, so as to ensure our communication, our engineering wiring generally uses Phoenix's because of the high cost performance.

It's much the same as a normal cable.

There are a few things to keep in mind:

The tensile strength is not as good as that of cables. Attention should be paid to check the tensile strength of the deployed optical cable in advance, and avoid excessive tensile force causing optical fiber fracture during the construction process, especially indoor optical cables and some special optical cables.

The bending strength is not enough. The minimum bending radius of the optical cable shall not be less than 20 times the diameter of the optical cable, including the local bending caused by bundling and fixing.

Remaining length at both ends. The end of the optical cable needs to be opened, and the docking joint needs to be protected after the docking process is completed, so the remaining length (at least 1 meter or more) should be retained at both ends of the wiring.

The ends are waterproof. If the construction will not continue in a short time, attention should be paid to the waterproof protection of the end of the optical cable.

Low grounding requirements. Optical fiber does not conduct electricity, and at the same time, strong electric field and strong magnetic field can hardly affect the transmission of optical fiber communication signals. Therefore, grounding protection can be almost ignored, and even outdoor fiber optic cables with metal protection can be completely insulated to replace traditional cable lightning protection and other protection that requires conventional grounding.

Some previous FTTH design materials can be sent to you for reference.

The optical fiber wiring construction plan is as follows:

1. When the optical fiber is to be turned, its turning radius should be greater than 20 times the diameter of the optical fiber itself.

2. When the optical fiber passes through the wall or floor, a protective plastic pipe with a protective mouth should be added, and the pipe should be filled with flame-retardant filler. It is also possible to pre-lay a certain amount of plastic pipes in the building.

3. The length of a deployment should not be too long (generally 2km), and the wiring should be pulled from the middle to both sides.

4. When the optical fiber is applied to the backbone network, at least 6 optical cables should be used in the wiring room on each floor, and 12 optical cables should be used for advanced applications. This is considered from three aspects: application, backup, and expansion.

5. The most important thing for long-distance optical fiber laying is to choose a suitable path. The shortest path is not necessarily the best, but also the right to use the land, the possibility of erection or burial, etc.

6. When laying in mountainous areas and high-voltage power grid areas, it is necessary to pay attention to the reliable grounding of metal objects in the optical fiber, generally there should be 3 grounding points per kilometer, or non-metallic optical fibers should be selected.