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Optic Fiber Cable Closure

Views: 88     Author: Site Editor     Publish Time: 2020-03-26      Origin: Site

Optic fiber Cable Closure are the popular name, called the cable connecting box, also known as optical fiber cable connector package, package and barrel. The device belongs to a mechanical pressure sealing joint system, which is a continuous protective device for providing optical, sealing and mechanical strength continuity between adjacent optical cables. Mainly in the application of straight overhead, in various cable structure of the pipeline, buried and other installation and branch connection.

cable connecting box

The box body adopts imported reinforced plastics, high strength and corrosion resistance, the terminal box is suitable for the connection of the terminal room of the structural optical cable, the structure is mature, the sealing is reliable, and the construction is convenient. Widely used in communication, network system, CATV cable, optical cable network system, etc.. On the right side for two in two out of the joint box;

For two or a plurality of fiber optic cables between the joint protection, optical fiber distribution, user access point is one of the commonly used equipment, main wiring cable and home line cable in outdoor connection, and according to the FTTx access to install or cassette Jane photon splitter;

Product characteristics

The box body of the product adopts the high quality engineering plastic.

Products using 2 pressure cable technology, ensure the box without additional attenuation of optical fiber.

Products with multiple reuse and expansion capabilities.

Technical characteristics

- size: height 430mm inner diameter is 135mm maximum diameter of 210mm

And into the cable hole neck: diameter 20mm

Single core number: 12/24

Max melt fiber plate: the minimum capacity of 4 core maximum capacity of 144 core

Maximum number: 6 - splice

Tensile tightness: 2000N axial tension, no leakage.

Voltage resistance: 15KV (DC).

Stretch seal: after the inflation of the product, can withstand the axial tension of 2000N, no leakage.

Impact seal: after the inflatable products, can withstand the impact of energy 16N*m (Newton * m) impact three times, no cracks in the product, no leakage.

And other performance requirements are in line with the YD/T814.1-2004 standard requirements.


According to the shape of the structure can be divided into cap type cable connector box and horizontal optical cable connector box two;

According to the cable laying way, overhead pipeline (tunnel) and direct buried type;

According to the optical cable connection is divided into direct connection and differences in two;

According to the sealing method of thermal contraction and mechanical seal. 

Performance requirements

Optical fiber joint by joint box protection, should be able to avoid tidal erosion should not be increased protection of optical fiber connector attenuation, and meet the following requirements:

optical performance

Optical cable connector box within the remaining optical fiber coiled in the fiber placement device, in optical cable connector box installation and use of operation, fiber optic connectors should be no significant additional attenuation.

Sealing performance

Optical cable connector box according to the provisions of procedure package after, optical cable connector box filling pressure (100 judges 5) kPa, soak in room temperature water container stability observed 15 minutes should be no air bubbles escaping, or stability observed 24 hours pressure meter indication should be no change.

Re sealing performance

The optical cable connector box is repeated 3 times for testing after the operation procedure is repeated. Optical cable connector box inflation pressure is l00kPat5kPa, soak in water containers at room temperature for 15 minutes, stable observation should be no bubble escape, or stable observation 24 hours barometer should not change.

Mechanical properties

After the following experiments, the optical cable junction box box and the box should be no change in the box, if necessary, to do through the light check or open the box inspection. Each of the following tests shall be within the optical cable connector box filling (60 judges 5) kPa pressure and test pressure should be no change; leaching water container at room temperature stability observed 15 minutes should be no bubbles escaping or stability observed 24h pressure table index should be no change, shell and its components should be no cracks, damage and deformation is obvious.

Installation method

Optical fiber preparation

1. Remove the cable jacket, if there is, please remove shield and armored) and remove the wrapping layer to expose the loose tube, specific methods, please cable manufacturers recommended by standard methods and steps for and reserve length of 3 meters.

2, use detergent to clean the loose casing and strengthen the core sheath, remove excess filled cannulae, with the sandpaper cable jacket length of 150 mm.

cable connecting box

Optical cable installation

1, according to the diameter of the optical cable to select the smallest diameter of the sealing ring, and the two seal ring set on the cable.

2, put the cable into the hole in the corresponding.

3, connection shielding and grounding.

4, between the two sealing ring winding self-adhesive sealing tape, to make the sealing belt around with sealing ring outer diameter flat together, to form a cable sealing end.

5, the cable seal end into the hole in the optical cable.

6, with hose clamps through optical cable reinforcing rib fixing seat and a cable core, a bracket, fiber optic cable will be fixed on the base of the connector box, tighten the screw hose clamps, until the hose clamp pull tight so far.

In 7, cable tie nylon tie, cut more than long.

8, the rest of the optical cable hole, please use the plug seal. The same winding on the seal tape, the same requirements with the 5.2.4.

9, the reinforcing member is wound on the sinking head screw of the fusion plate bearing and is pressed.

Optical fiber splice

Optical fiber splice

1, prepare the hanging wall after 1.5 laps of the coiled fiber, then all remaining fiber coiled in the box body.

2, please use the single core fiber on single core fiber ribbon on the buffer tube, please use the strip buffer tube. In the melting at inlet flange with nylon tie tie.

3, according to the provisions of the two docking method (band) optical fiber connector into the welding unit card slot, will be paid please disk wound.

4, the fusion plate cover, please press the card in place.

5, according to the capacity of the joint box, melting disc superposed sets, the welding plate stacking pattern must be consistent with the optical fiber connector of the card into the melting connection unit and the inspection and maintenance requirements. Welding disc every two superimposed, can be six holes on the rubber hinge, were stuck on the two disc for each of the three convex torsion; four rubber hinge, disc on both sides of the symmetrical positions of the two, such as superposition of five welding disc. According to the method mentioned above the second floor plate and three button, three wheel and four wheel buckle, four layer plate and five layer plate buckle, by analogy, five disc is stable superposition together. When need to inspect and maintain a layer plate weld connected, as long as the plate on one side of the upper buckle the two foldouts removed, welding plate can be, such as turning the page open.

Box seal

1, box package: in the case before the first valve nozzle and the ground screw and tight. The sealing strip is embedded in the sealing groove around the box body; and the sealing strips are respectively embedded in the groove of the U groove at the two ends of the joint box. Note: use the seal, do not pull the seal artificially, so as not to leak.

2, the joint of from the of an cover of the box gently close, screw bolts, the tightening sequence press and cover marked the digital sequence tighten and torque spanner is used to ban solid, torque reaches 25N - M.

3, after 3 minutes, and then tighten the torque wrench, torque is still up to m 25N.

Remove the lid

1, in order to loosen the 10 fastening bolts, at this time the lid and seat are still together.

2, take four fastening bolts are inserted into the box body four angle, symmetry, evenly into the four corner of the top cap, so that the lid and seat separation up to 6mm.

3. After 5 minutes, the cover and the seat are separated by the >6mm, so that the cover and the seat can be separated easily by hand.

Note: the lid must be gently removed to avoid damage to the fused fiber.

4, such as the end of the increase or inspection, the need to re cover, you must remove the old seal, re laying the seal to the sealing groove, including the "U" slot at the entrance end of the cable seal.