Overview
The GJS-M9/JFT-BS Dome Closure is a compact, high-performance fiber splice enclosure designed to protect and organize optical fiber connections in harsh outdoor and underground environments. As part of the dome-type mechanical seal closure family, this product offers a durable and flexible solution for FTTH, FTTx, backbone, and distribution networks.
With its IP68-rated sealing, stacked tray design, and support for SC simplex and duplex adapters, the GJS-M9/JFT-BS-II provides a space-saving yet scalable option for both new deployments and network upgrades.
Application Scenarios
This dome closure is ideal for:
Fiber-to-the-home (FTTH) distribution nodes
Access point fiber joints
Underground handholes and vaults
Wall-mounted or pole-mounted fiber distribution
Harsh weather areas require waterproof protection
Whether you're working in rural fiber rollouts or dense metro fiber rings, the JFT-BS ensures secure joint protection, convenient installation, and flexible capacity expansion.
Key Features
1. Compact Yet High-Capacity
Despite its compact size (Φ330 × 390 mm), the GJS-M9/JFT-BS-II supports multiple splice tray types and can accommodate up to 432 fiber cores in the SC16 model, and up to 216 fiber cores in the 2SC32 model.
2. Robust Construction with IP68 Protection
Constructed with high-strength engineering plastic
Excellent resistance to mechanical stress, UV, corrosion, aging, and lightning
IP68 rating provides reliable waterproof and dustproof performance
3. Optimized Port Design
Total of 9 cable ports (1 oval + 8 circular)
Compatible with cable diameters from 7 mm to 26 mm
The oval and two large circular ports can be used for loop-through or mid-span branching
4. Flexible Splice Tray Options
Choose from B, C, F, or H type trays, depending on your project's fiber count and layout needs.
| Tray Type | Max Fibers per Tray | SC16 Model – Max Trays | SC16 – Max Capacity | 2SC32 Model – Max Trays | 2SC32 – Max Capacity |
|---|---|---|---|---|---|
| B | 8 | 36 | 288 | 18 | 144 |
| C | 16 | 18 | 288 | 9 | 144 |
| F | 24 | 18 | 432 | 9 | 216 |
| H | 12 | 36 | 432 | 18 | 216 |
This modular design makes the closure suitable for both low-density residential drops and high-density access points.
5. Adapter and Splitter Integration
SC Simplex Adapters: Up to 17 pcs (SC16 model)
SC Duplex Adapters: Up to 33 pcs (2SC32 model)
Splitter Slots: Supports 1:16 (1 pcs) and 1:32 (2 pcs) PLC splitters
These features make it ideal for GPON/EPON access deployments where splitter integration is required.
6. Mechanical Seal Design
No heat shrink required - mechanical sealing via threaded locking
Easy to open and re-seal during maintenance
Maintains a tight seal under temperature changes and vibrations
Suitable for repeated use during future expansions
7. Grounding and Safety Features
Built-in independent insulation grounding system
Enhances operator safety and fiber protection
Simplifies ground wire management during cable entry
Technical Specifications
| Parameter | SC16 Model (GJS-M9/JFT-BS(SC16)-II) | 2SC32 Model (GJS-M9/JFT-BS(2SC32)-II) |
|---|---|---|
| Type | Dome-type mechanical seal closure | Dome-type mechanical seal closure |
| Dimensions | Φ330 × 390 mm | Φ330 × 390 mm |
| Cable Ports | 1 oval + 8 circular | 1 oval + 8 circular |
| Cable Diameter Range | 7 mm ~ 26 mm | 7 mm ~ 26 mm |
| Splice Tray Type Options | B / C / F / H | B / C / F / H |
| Max Splice Tray Quantity | Up to 36 trays (depending on type) | Up to 18 trays (depending on type) |
| Max Fiber Capacity (Single Core) | Up to 432 fibers | Up to 216 fibers |
| Max Splitting Support | 1:16 (1 pcs) | 1:32 (2 pcs) |
| Adapter Support | SC Simplex – 17 pcs | SC Duplex – 33 pcs |
| Fiber Radius of Curvature | > 40 mm | > 40 mm |
| Additional Optical Loss | < 0.01 dB | < 0.01 dB |
| Operating Temperature | -20°C ~ +60°C | -20°C ~ +60°C |
| Lateral Pressure Resistance | > 2000 N / 10 cm | > 2000 N / 10 cm |
| Shock Resistance | > 20 N·m | > 20 N·m |
| Protection Rating | IP68 | IP68 |
| Packaging Size | 420 × 330 × 320 mm | 420 × 330 × 320 mm |
| Total Weight | ≈10.5 kg | ≈10.5 kg |
Key Benefits
· Compact, high-density capacity up to 432 fibers
· Multiple splice tray options to match various fiber layouts
· Supports SC simplex and duplex adapters
· Integrated PLC splitter slots for PON architecture
· IP68 protection ensures reliable performance in outdoor and underground conditions
· Tool-free mechanical seal makes installation fast and safe
· Grounding-ready design improves operational safety and compliance
Use Case Scenarios
FTTH Drop Closures – serve as terminal points for residential connections
Access Network Branch Points – enable mid-span or loop-through fiber splicing
Pole-Mounted Fiber Distributors – compact and durable for elevated installations
Wall-Mount Installations – space-saving option for outdoor cabinets
Manhole or Underground Vaults – excellent water and dust sealing performance
Integrated SEO Keywords
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Conclusion
The GJS-M9/JFT-BS-II Dome Closure is an ideal solution for network engineers seeking a compact, flexible, and durable fiber splice closure. Whether deployed in a dense urban FTTH rollout or a rugged rural fiber line, this model ensures reliable protection, convenient installation, and scalable capacity. It is a smart choice for both high-density service hubs and space-constrained deployment sites.
For project consultation or to request a quotation, please contact SpringOptic.
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