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What is fiber optic distribution box?

February 17, 2022

Optical fiber distribution boxes are commonly used products in FTTH and FTTB networks. The shielded optical cable access point is connected to the client, so that the optical cable access point is stable, dustproof and waterproof. Minimize the interference of the optical cable access sign to the external environment as much as possible. According to the various requirements of the actual application environment, there are many types of optical fiber distribution boxes on the market. The following points will help you understand everything about it.


1. Position in the field of optical fiber communication

Optical cable is like the water pipe we use, in the extraction process, when the consumer requests it, it needs to be diverted to the user, but the diversion node needs to prevent the leakage and formation of tap water. A device that splits optical signals is called an optical distribution box.

2. the application of optical cable distribution box

The installation positions of the optical fiber distribution boxes are also different in the three cases. FTTH is usually installed on the floor. From the hallway, the FTTB is on the wall of the building. The FTTC is generally set up on poles in this rural area.


3. Internal structure of optical distribution box

The function of the optical fiber distribution box is mainly to protect and disconnect the optical cable. Then its structure is divided into four parts:

Optical cable entry: This interface is mainly used for external optical cable access. The added optical cable plays a tightening role at the entrance and is not easy to loosen. The water inlet is sealed with rubber, and the waterproof effect is better.

Splice tray: The external optical cable should be spliced ​​together with the splitter or the end of the pigtail of the fifth distribution box; the splice tray is essential, which is convenient for welding and improves the success rate of welding.

Splitter tray: Some versions have splitter trays, some don't, because this is just a fixture, which is more convenient and compact when installing splitters and pigtails. Several shapes of this fiber supply menu can be viewed and splice trays combined in various fiber management boxes. Furthermore, the functionality is the same, it is just the result of continuous improvement that results in fiber splicing and cabling more suitable for technical applications.

Outlet: The number of outlet can determine the basic model of the distribution box, such as 8 sockets, then its 8-core fiber optic terminal box, the outlet is much smaller than the inlet.


4. Classification

The fiber distribution box can be divided into 4 cores, 6 cores, 8 cores, 12 cores, 16 cores, 24 cores, 36 cores, 48 ​​cores, etc. according to the capacity.

Installation method description: It can be wall-mounted or pole-mounted.

Its function can be an ordinary optical fiber distribution box, or it can be a distribution box with optical fiber fusion function.


5. The material of the optical fiber distribution box

The materials used in mainstream supply boxes are SMC, ABS+PC, ABS, PP. The quality of the four materials is from good to bad, and the price is from high to low. The quality differences between materials are material density, gloss, heat resistance, impact resistance, compression resistance, abrasion resistance and flame resistance. The most cost-effective material is ABS+PC, which will be able to meet most of the material requirements for fiber optic junction boxes at a moderate cost.

Although the SMC fiber optic terminal box is of high quality, it is mainly used in too harsh environments, the cost is high, and the product market is not large. Due to the fierce market competition, product prices are getting lower and lower. The cost of pure ABS material optical cable distribution box is lower and occupies most of the market, so the overall performance of the project is slightly reduced. PP is the cheapest in performance and has a brittle texture, and is generally used to make fiber splice boxes.