1. Scope of Application
This installation manual guides the proper installation of the Fiber Optic Splice Closure (hereafter abbreviated as FOSC).
Application Scenarios:
Aerial
Underground
Wall-mounted
Duct-mounted
Handhole-mounted
Ambient Temperature Range: -40°C to 65°C.
2. Basic Structure and Configuration
2.1 Dimensions and Capacity
| Parameter | Specification |
|---|---|
| Outside Dimensions (H x D) | 460mm × 190mm |
| Weight (excluding outer box) | 2050g – 2500g |
| Number of inlet/outlet ports | 4 ports |
| Fiber cable diameter range | Φ8mm – Φ16mm |
| FOSC Capacity | Bunchy: 12-96 cores Ribbon: up to 144 cores |
2.2 Main Components
| No. | Component | Quantity | Usage | Remarks |
|---|---|---|---|---|
| 1 | Housing | 2 pieces (left & right) | Protects fiber cable splices | H: 230mm, D: 150mm |
| 2 | Fiber Optic Splice Tray (FOST) | Max. 4 trays (bunchy/ribbon) | Fixes heat-shrinkable sleeves and holds fibers | Bunchy: 12/24 cores, Ribbon: 3 pieces |
| 3 | Foundation | 1 set | Fixes internal structure and connects external elements | – |
| 4 | Plastic hoop | 1 set | Fixes the left and right housing together | – |
| 5 | Gasket ring | 1 large + 4 small | Seals housing and inlet/outlet tubes | – |
| 6 | Pressure testing the valve | 1 set | For pressure and sealing tests | As required |
| 7 | Earthing device | 1 set | Ground the metallic parts of fiber cables | As required |
2.3 Main Accessories and Special Tools
| No. | Accessory | Quantity | Usage | Remarks |
|---|---|---|---|---|
| 1 | Heat shrinkable sleeve | – | Protects fiber splices | As per capacity |
| 2 | Nylon tie | – | Fixes fibers with a protective coat | As per capacity |
| 3 | Earthing wire | 1 piece | Connects earthing devices | – |
| 4 | Abrasive cloth | 1 piece | Prepares the fiber cable surface | – |
| 5 | Labeling paper | 1 piece | Label fiber cables | – |
| 6 | Special wrench | 2 pieces | Tightens reinforced core and plastic nuts | – |
| 7 | Measuring paper | 1 piece | Measures the perimeter for seal tape preparation | – |
| 8 | Seal tape | 1 ring | Enlarges the fiber cable diameter for the gasket ring fit | – |
| 9 | Insulation tape | 1 ring | Enlarges the fiber cable diameter for easier fixing | – |
| 10 | Hanging hook | 1 set | For aerial applications | – |
| 11 | Buffer tube | Customer-defined | Protects and manages fiber within FOST | – |
| 12 | Desiccant | 1 bag | Dehumidifies the air within FOSC | – |
3. Necessary Tools for Installation
3.1 Supplementary Materials (Provided by Operator)
| Material | Usage |
|---|---|
| Scotch tape | Labeling, temporary fixing |
| Ethyl alcohol | Cleaning |
| Gauze | Cleaning |
3.2 Special Tools (Provided by Operator)
| Tool | Usage |
|---|---|
| Fiber cutter | Cutting fiber cables |
| Fiber stripper | Stripping fiber protective coat |
| Combo tools | Assembling FOSC |
3.3 Universal Tools (Provided by Operator)
| Tool | Usage |
|---|---|
| Band tape | Measuring fiber cables |
| Pipe cutter | Cutting fiber cables |
| Electrical cutter | Removing protective coat |
| Combination pliers | Cutting reinforced core |
| Screwdriver | Cross/parallel screwdrivers |
| Scissors | – |
| Waterproof cover | For a waterproof and dustproof environment |
| Metal wrench | Tightening reinforced core nut |
3.4 Splicing and Testing Instruments (Provided by Operator)
| Instrument | Usage |
|---|---|
| Fusion splicing machine | Fiber splicing |
| OTDR | Splicing testing |
| Temporary splicing tools | Temporary splicing tests |
Note: All above tools and instruments are to be provided by the operators.
4. Installation Flow Chart
5. Installation Procedure
5.1 Step One – Opening the Closure
Clean the work area and identify the installation location.
Confirm that all components and accessories are ready.
Disassemble the closure:
Remove the hoop fixing bolt and pull out the locking system.
Slide the left and right housing parts outward to open the closure.
See Drawing 1 for illustration.
Important: If weather conditions are poor, set up a waterproof tent to protect the work area.
5.2 Step Two – Determine Fiber Cable Lengths
| Length | Purpose |
|---|---|
| 90mm | From a small gasket ring to fiber cable pressboard |
| 2000mm | Stripped and coiled for splicing |
| 400mm | From the fiber cable fixing point to the FOST fixing point |
| 1600mm | Stripped fiber to be coiled inside FOST after splicing |
Note: Adjust lengths per actual installation needs.
See Drawing 2 for details.
5.3 Step Three – Strip Fiber Cable and Protective Coat
Use a fiber cutter and stripper to strip the protective coat according to Drawing 2.
If difficult, strip section by section to prevent fiber breakage.
See Drawing 3.
5.4 Step Four – Prepare Fibers for Fixing
Wrap 2 layers of insulation tape on the protective coat.
Remove stuffing and clean fibers.
Form a ~100mm fiber ring and temporarily fix it with adhesive tape.
Remove the corresponding port plugs if needed (max 4 fiber cables).
If the cable diameter is smaller than the inlet/outlet port, use seal tape to enlarge it.
Reserve a 60mm reinforced core, and cut off the excess.
See Drawing 4 for details.
Important:
Scratch and clean the fiber cable with an abrasive cloth and ethyl alcohol before applying seal tape.
Use special cutting pliers to cut the reinforced core.
5.5 Step Five – Fix Reinforced Core and Fiber Cable
Remove port plugs, pressboard, and fixing nut of the reinforced core.
Insert the prepared fiber cable into the FOSC.
Tighten the pressboard. If the diameter is small, wrap with insulation tape.
Use a special plastic wrench to tighten the reinforced core nut, then secure with a metal wrench.
See Drawing 5.
5.6 Step Six – Splice Fibers
Follow the fusion splicing machine's user manual.
Important: Avoid twists and bends in the fiber.
5.7 Step Seven – Install Heat Shrink Sleeves and House Fibers
After splicing, place the first fiber ring at the farthest side of the FOST.
Coil the remaining fiber into an ~80mm ring and place it in the FOST with heat-shrinkable sleeves.
Fix sleeves in the slots and properly enlarge the fiber ring diameter.
See Drawing 6.
5.8 Step Eight – Comprehensive Check
Fibers are spliced and arranged in order.
Bending radius of fibers meets technical standards.
Inlet/outlet ports not used are plugged.
A proper amount of seal tape is used.
Sealing fittings are neat and smooth; if not, adjust with seal tape.
See Drawing 7.
5.9 Step Nine – Assemble the FOSC Housing
Insert one end of the foundation into the orbit of the housing, then attach the other end.
Install the plastic hoop between the left and right housing and tighten the hoop locking system.
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