Overview
The GJS-M9/JFT-B Dome Closure is a versatile and durable fiber dome closure engineered for protecting fiber optic cable splices across various network environments. Built with robust materials and offering superior sealing performance, this enclosure is suitable for aerial, pole-mounted, wall-mounted, and underground applications.
With support for a wide range of fiber capacities, multiple splice tray types, and SC adapter configurations, the GJS-M9/JFT-B-II delivers a flexible solution for high-density FTTH, FTTx, backbone, and distribution networks.
Application
This dome-style fiber optic splice closure is specifically designed to:
Protect and organize optical cable splices
Enable direct-through and branching connections
Provide long-lasting protection in outdoor and underground environments
Its modular tray system and flexible sealing design make it ideal for both new installations and network upgrades.
Key Features
1. Rugged and Weather-Resistant Housing
Made of high-strength engineering plastic
Resistant to corrosion, UV exposure, aging, and lightning
Withstands extreme environmental conditions for long-term performance
Lightweight yet extremely durable
2. Comprehensive Port Design
1 oval port and 8 circular ports for a total of 9 cable entry/exit points
Supports cable diameters from 7mm to 26mm
Oval port and two large round ports can be used for cable looping or mid-span access
3. Adapter & Splitter Integration
SC simplex and SC duplex adapters are supported
Max adapter quantity: SC simplex × 27 or SC duplex × 51
Supports 1:8 and 1:32 PLC splitters (up to 3 pieces)
Ideal for GPON/EPON deployments
This makes the closure highly compatible with splitter-based PON architectures.
4. Mechanical Seal Design
Uses a threaded mechanical seal system
Ensures reliable protection without heat shrink tubes or adhesives
Easy to open, reseal, and maintain
Achieves IP68 protection level, suitable for direct burial or submersion
5. Flexible Grounding & Expansion
Built-in independent insulation grounding device
Enhances safety during cable grounding
Allows easy expansion or maintenance without disturbing existing splices
Technical Specifications
| Parameter | Specification | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product Model | GJS-M9/JFT-B-SC24-II | GJS-M9/JFT-B-2SC48-II | |||||||
| Type | Dome-type mechanical seal closure | ||||||||
| Dimensions | Φ330 × 530 mm | ||||||||
| Cable Ports | 1 oval + 8 circular | ||||||||
| Cable Diameter Range | 7 mm ~ 26 mm | ||||||||
| Max capacity of splicing tray(single core) | B | C | F | H | B | C | F | H | |
| Max capacity of splicing tray(single core) | 8 | 16 | 24 | 12 | 8 | 16 | 24 | 12 | |
| Max number of splicing trays | 72PCS | 36PCS | 36PCS | 72PCS | 36PCS | 18PCS | 18PCS | 36PCS | |
| Max capacity.(single core) | 576 | 576 | 864 | 864 | 288 | 288 | 432 | 432 | |
| Max Splitting | 1:8 (3pcs) | 1:32 (3pcs) | |||||||
| Adapter Types | SC Simplex/27pcs | SC Duplex/51pcs | |||||||
| Fiber Radius of Curvature | > 40 mm | ||||||||
| Additional Optical Loss | < 0.01 dB | ||||||||
| Operating Temperature | -20°C ~ +60°C | ||||||||
| Lateral Pressure Resistance | > 2000 N / 10 cm | ||||||||
| Shock Resistance | > 20 N·m | ||||||||
| Protection Rating | IP68 | ||||||||
| Splitter Support | 1:8 (3 pcs) or 1:32 (3 pcs) | ||||||||
| External Packaging Size | 530 × 330 × 310 mm | ||||||||
| Total Weight | ≈13 kg | ||||||||
Advantages at a Glance
· High Fiber Capacity: Up to 864 fibers with flexible tray options for different use cases
· Versatile Deployment: Compatible with aerial, underground, pole, or wall mounting
· Built-in Splitter Support: Simplifies integration with PON systems
· No Heat Tools Needed: Mechanical seal makes installation and reentry faster and safer
· Superior Environmental Protection: Withstands water, dust, UV, and extreme temperatures
· Customizable Tray Configuration: Choose from B, C, F, or H trays based on project needs
Typical Use Cases
FTTH Distribution Points: Combine high fiber count and compact layout for residential rollouts
Metro and Backbone Networks: Ideal for dense mid-span splicing and cable branching
Outdoor Cabinet Integration: Fits into handholes, wall boxes, or telecom poles
Rural or Harsh Terrains: IP68 rating ensures performance even in challenging environments
Conclusion
The GJS-M9/JFT-B-II Dome Closure is a powerful and flexible solution for modern fiber networks requiring high-density splicing, integrated splitter support, and superior environmental protection. Designed for simple operation and reliable long-term use, this enclosure is a must-have for telecom operators, contractors, and system integrators looking to future-proof their optical infrastructure.
For more information, custom configurations, or OEM inquiries, please contact SpringOptic.
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