Fiber Optic Distribution Box is used as a termination point for the feeder cable to connect with drop cable in FTTX communication network system.

It intergtates fiber splicing, splitting, distribution, storage and cable connection in one unit. Meanwhile, it provides solid protection and management for the FTTX network building.

Fiber Optic Distribution Box Features

1、Total enclosed structure.

2、Material: ABS, wet-proof、 water-proof、dust proof、anti-aging, protection level up to IP68.

3、Clamping for feeder cable and drop cable, fiber splicing, fixation, storage distribution ... etc all in one.

4 、Cable, pigtails, patch cords are running through own path without disturbing each other, cassette type SC adaptor installation, easy maintenance.

5、Distribution panel can be flipped up, feeder cable can be placed in a cup-joint way, easy for maintenance and installation.

6 、Box can be installed by the way of wall-mounted or poledmounted,suitable for both indoor and outdoor uses.

1. The position of the fiber distribution box in the optical fiber communication

The transmission of the optical signal in the optical fiber is just like the flow of tap water in the water pipe. During the transmission process, when a user needs, it needs to be shunted to the user, but the shunt node needs a protection to prevent the tap water from leaking and forming.The node protection device that shunts the optical signal is called the fiber distribution box. This is its position in optical communication field.

2. Application scenarios of fiber distribution box

The optical network signal to the end user is generally divided into three scenarios, FTTH, FTTB, and FTTC, which are the last kilometer projects of optical fiber communication. The installation positions of the fiber distribution boxes in the three scenarios are also different. FTTH is on the floor. In the corridor, FTTB is on the wall of the building, FTTC is generally installed on the pole of the rural pole.

3. Internal structure of fiber distribution box

The function of the fiber distribution box is mainly to protect and split the fiber. Then its structure is divided into four parts,

Cable inlet: This interface is mainly used for external optical cable access. The inserted optical cable plays a fastening role at the access port and is not easy to loosen. And the cable inlet is generally under the fiber distribution box, which has better waterproof effect.

Splice tray: The external optical cable should be welded with the splitter or the headless end of the pigtail in the fiber distribution box, splice tray is necessary,which is convenient for welding and improves the success rate of welding.The thin card slot in the picture is for splicing the optical fiber after alignment.

Fiber splitter disks: Some fiber splitter disks are available in some models, and some are not, because this only acts as a fixture and makes it more convenient and compact when installing splitters and pigtails. You can see various shapes of the fiber distribution tray and fusion splice tray in different kinds of fiber distribution boxes,But the function is same, it’s just the result of continuous improvement to make fibre fusion and cabling more convenient in practical applications.

Outlet: the number of outlets can determine the basic model of a distribution box, such as 8 outlets, then it is basically 8-core distribution box, the outlet is much smaller than the inlet port, because the cable received from the user side of the fiber optic jumper or pigtail-based, the diameter of these wires are much smaller.

4.  Classification of fiber optic distribution box

According to the capacity,fiber distribution box can be divided into: 4 core, 6 core, 8 core, 12 core, 16 core, 24 core, 36 core, 48 core and so on.  The 8-core and 16-core are the most used.

According to the installation mode: can be divided into wall-hanging type and holding pole type.

According to the application scene: can be divided into indoor and outdoor type.

According to function: It can be divided into ordinary distribution (caja) box and distribution (caja) box with splicing function.

5.  Material of fiber distribution box

At present, the materials used by mainstream distribution box are: SMC, ABS+PC, ABS, PP.The quality of the four materials is in order from good to bad, and the cost is from high to low. The differences in quality between the materials are in terms of material density, gloss, heat resistance, impact resistance, compression resistance, abrasion resistance and flame resistance. The most cost-effective of the four materials is ABS+PC, which is capable of meeting most of the material requirements of fibre distribution boxes at a moderate cost.

Although the SMC fiber distribution box is of high quality, but mainly used in extremely harsh environments, and high cost, the product market is not large. Due to the market competition is very sharp, product prices are getting lower and lower, the lower cost of pure ABS material distribution box occupies most of the market, so that the overall performance of the product is slightly decreased. PP material is the lowest performance, more brittle texture, generally used to make joint box, if used as a distribution box, the distribution box is certainly not over the impact test.

Personal recommendation for four kinds of material distribution box : if customers prefer quality, recommended PC + ABS, if customers prefer the price, recommended pure ABS material.  Take the mainstream 16-core fiber distribution box for example, each box uses 1KG of material, the cost difference between the two materials is around 0.5USD.  But it is difficult for people to distinguish the difference between these two materials, need professional testing, or good communication and cooperation of the manufacturer.