1. Scope of Application
This installation manual is intended for the Fiber Optic Splice Closure (FOSC), serving as a guide for proper installation.
Application Scenarios:
Aerial
Underground
Wall-mounting
Duct-mounting
Handhole-mounting
Operating Temperature: -40℃ to +65℃
2. Basic Structure and Configuration
2.1 Dimensions and Capacity
Outside Dimension (L×W×H): 340×150×70 mm
Weight (excluding outer box): 1500g–2000g
Number of Inlet/Outlet Ports: 2 on each side (total 4 ports)
Fiber Cable Diameter: Φ8-Φ16 mm
Capacity:
Bunchy Fiber: 12–48 cores
Ribbon Fiber: Max. 72 cores
2.2 Main Components
| No. | Component Name | Quantity | Usage | Remarks |
|---|---|---|---|---|
| 1 | Housing | 1 set | Protects fiber splices | Internal size: 270×100×60 mm |
| 2 | Fiber Optic Splice Tray (FOST) | Max. 2 pcs | Holds fibers and heat-shrink sleeves | Bunchy: 12/24 cores, Ribbon: 3 pcs |
| 3 | Foundation | 1 set | Secures fiber cable core and FOST | |
| 4 | Seal Fitting | 1 set | Ensures tight sealing between the cover and base | |
| 5 | Port Plug | 4 pcs | Seals unused ports | |
| 6 | Pressure Testing Valve | 1 set | Used for air injection and seal testing | Optional |
| 7 | Earthing Deriving Device | 1 set | Ground metallic cable components | Optional |
2.3 Accessories & Special Tools
| No. | Name | Quantity | Usage | Remarks |
|---|---|---|---|---|
| 1 | Heat-shrinkable Sleeves | As per capacity | Protects fiber splices | |
| 2 | Nylon Ties | As per capacity | Secures fiber with pa rotective coat | |
| 3 | Insulation Tape | 1 roll | Enlarges cable diameter for secure fixing | |
| 4 | Seal Tape | 1 roll | Seals and enlarges the cable diameter | As per the specification |
| 5 | Hanging Hook | 1 set | For aerial installation | |
| 6 | Earthing Wire | 1 piece | Connects earthing devices | |
| 7 | Abrasive Cloth | 1 piece | Scratches cable for better adhesion | |
| 8 | Labeling Paper | 1 piece | Fiber identification | |
| 9 | Special Wrench | 3 pieces | Tightens bolts and core nuts | |
| 10 | Buffer Tube | As required | Fiber management inside the tray | Optional |
| 11 | Desiccant | 1 bag | Moisture removal before sealing |
3. Necessary Tools for Installation
3.1 Supplementary Materials (Provided by Operator)
Scotch Tape – For labeling and temporary fixing
Ethyl Alcohol – For cleaning
Gauze – For cleaning
3.2 Special Tools (Provided by Operator)
Fiber Cutter – For cutting fibers
Fiber Stripper – For stripping cable sheath
Combo Tools – For assembling the closure
3.3 Universal Tools (Provided by Operator)
Band Tape – For measuring
Pipe Cutter – For cable cutting
Electrical Cutter – For removing the outer sheath
Combination Pliers – For core cutting
Screwdriver – Cross/flat types
Scissors
Waterproof Cover
Metal Wrench – Tightening reinforced core nuts
3.4 Splicing and Testing Instruments (Provided by Operator)
Fusion Splicing Machine – For fiber fusion
OTDR – For testing splice loss
Provisional Splicing Tools – For temporary testing
4. Inspection and Testing
| Item | Technical Requirement | Inspection Type |
|---|---|---|
| Package | One FOSC with accessories, tools, manual, and packing list | Routine Test (Full) |
| Appearance | Smooth finish, no burrs, cracks, bubbles, warps, or other defects | At least 3 samples |
| Sign | Clear product marking | |
| Fiber Storage Device | Fiber length ≥1.6m, bend radius >30mm, no attenuation during install/maintenance | At least 3 samples |
| Electrical Components | Earthing and metallic connectivity are available | |
| Sealing | 100±5KPa air pressure, no leakage after 15 mins water immersion & 24h pressure observation | |
| Re-sealing | Same as above, after opening and resealing | |
| Pull Strength | ≥800N axial, no housing breakage | At least 3 samples |
| Punching Strength | 2000N/10cm for 1 min, no damage | At least 3 samples |
| Impact Resistance | 16N•m, 3 times, no damage | At least 3 samples |
| Bending | 150N at ±45°, 10 cycles, no damage | At least 3 samples |
| Torsion | 50N•m, ±90°, 10 cycles, no damage | At least 3 samples |
| Temperature Cycling | -40℃~+65℃, 10 cycles, ≤5KPa pressure drop, no water leak | At least 3 samples |
| Voltage Resistance | DC 15kV for 1 min, no breakdown when submerged at 1.5m for 24h | |
| Insulating Resistance | ≥2×10⁴MΩ between components and ground after 24h of water immersion |
Note: Operators must prepare all tools and testing instruments independently.
5. Versatile Deployment Across Network Topologies
Fiber Optic Splice Closures are engineered to support a wide range of network architectures, from point-to-point long-haul transmissions to dense FTTx environments. Their compatibility with aerial, underground, duct, and handhole installations makes them suitable for metropolitan backbone projects, rural broadband expansions, and even rapid-deployment emergency repair applications. Whether used in centralized fiber distribution hubs or remote access nodes, FOSC units help maintain network integrity and simplify splicing operations in both greenfield and brownfield deployments.
6. Enhanced Mechanical Design for Long-Term Reliability
Built with high-performance engineering plastics, the FOSC housing provides exceptional resistance to environmental stress, UV radiation, and temperature cycling. Its mechanical sealing structure - typically reinforced with heat-shrink sleeves and specialized seal tapes - ensures IP68-grade protection against water ingress, dust, and chemical exposure. Internally, the flexible design of splice trays and strain-relief components minimizes the risk of micro-bending losses or mechanical fatigue, allowing for stable operation over decades of use. These structural advantages make the closure ideal for regions with harsh climates or unstable terrain.
7. Compatibility with Future-Proof Fiber Technologies
Modern FOSC designs are developed with scalability and future upgradeability in mind. They accommodate both single-mode and multimode fiber types, including ribbon and bunch configurations, and are compatible with advanced fiber types such as bend-insensitive G.657.A2 fibers. As networks evolve toward higher speeds like 10G/40G/100G and beyond, these closures support re-entry and reconfiguration without compromising seal integrity. This makes them an optimal choice for telecom carriers, data centers, railway communication lines, and smart grid infrastructures aiming to build future-ready optical networks.
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