I. Application
Fiber backbone and distribution networks
FTTx and ODN applications
Optical cable mid-span or end splice points
Harsh outdoor or underground environments
II. Product Features
· Robust Engineering Plastic Body: The housing is made of high-strength polycarbonate engineering plastic with anti-aging, UV resistance, and anti-corrosion properties. Lightweight yet impact-resistant, it is suitable for long-term outdoor exposure.
· Flexible Cable Entry: The closure features 9 cable ports - 1 oval port for uncut loop-through fiber cables and 8 circular ports (2 large, 6 small) for incoming and outgoing cables, supporting diameters from Φ7 mm to Φ26 mm.
· Stacked Splice Tray Design: Modular trays provide organized and expandable splicing. Each tray supports up to 24 cores, and the total capacity reaches 288 cores or 864 cores, depending on the model (GJS-M9/IFT-A1 or A2).
· PLC Splitter Compatibility: Integrated slots are designed for easy installation of 1:8 or 1:16 PLC splitters, enabling efficient signal distribution for FTTH or ODN solutions.
· Reliable Mechanical Seal: The enclosure uses threaded mechanical sealing with enhanced sealing rubber rings, achieving an IP68 protection level - dustproof, waterproof, and suitable for harsh environments.
· Easy Mounting Options: Supports pole, wall, and aerial mounting with optional brackets and accessories.
III. Technical Specifications
| Item | Specification |
|---|---|
| Model | GJS-M9/JFT-A1 / GJS-M9/JFT-A2 |
| Size (Diameter × Height) | Φ330 × 530 mm |
| Cable Ports | 1 oval port + 8 circular ports |
| Cable Diameter Range | Φ7 mm ~ Φ26 mm |
| Max Splice Tray Capacity | 24 cores/tray |
| Max No. of Splice Trays | 12 trays |
| Max Fiber Capacity (single core) | 288 (A1) / 864 (A2) |
| Sealing Type | Threaded mechanical seal |
| Protection Level | IP68 |
| Fiber Radius of Curvature | > 40 mm |
| Additional Optical Loss | ≤ 0.01 dB |
| Temperature Range | -20°C ~ +60°C |
| Anti-lateral Pressure | > 2000 N/10cm |
| Shock Resistance | > 20 N·m |
IV. Installation Guide
1. Fiber Cable Preparation
a) Loop-Through (Uncut) Cable:
Mark and strip the cable jacket for about 180 cm, or per project requirement.
Maintain the internal structure intact during stripping to protect loose tubes and fibers.
b) Break-Out (Cut) Cable:
Peel off approx. 120 cm of the outer jacket for both cable ends.
Carefully clean and retain the internal structure for splicing preparation.
2. Cable Port Installation
Note: Always clean the port areas and ensure sealing surfaces are dust-free.
a) Oval Port (Port 1):
Designed for mid-span or uncut cables.
Insert cable through the port, mount sealing parts in order, and tighten with screws.
b) Large Circular Ports (Ports 2–3):
Remove Φ51 mm sealant plugs, assemble sealing accessories around the cable, and secure using the provided wrench.
c) Small Circular Ports (Ports 4–9):
Remove Φ27 mm plugs, insert the cable with sealing rubber parts, and tighten with the nut.
SeeDraw: Port Sealing Diagrams
3. Internal Cable Fixing
Lock cables in place with hose clamps at the base panel.
Fix the cable's reinforcing core using presser blocks and screws.
Gently route the fibers to the appropriate splice trays for fusion.
SeeDraw: Cable Fixing Schematic
4. Fiber Splicing & Tray Management
Route the fiber into the splice trays in a clockwise or counterclockwise coil with a bending radius > 40 mm.
Perform fusion splicing as required. Use heat shrink sleeves for protection and insert them into the designated slots.
Fibers from PLC splitters should also be stored in the splice trays with adequate slack.
SeeDraw: Fiber Coiling & Splice Tray Usage
5. Closure Assembly
Place the main rubber sealing ring in the groove of the dome base.
Carefully align and place the dome cover on top of the base.
Use the mechanical sealing clamp (plastic band) to secure the cover. Ensure uniform tension and tightness.
SeeDraw: Dome Assembly Process
6. Mounting Options
a) Wall Mounting
Secure the mounting tray to the closure's base using 4 screws.
Attach the L-brackets and use expansion bolts to fasten them directly to the wall.
b) Pole Mounting
Connect the arc pole clamp to the L-bracket.
Fix the structure to the pole using metal bands and tighten securely with bolts.
SeeDraw: Wall & Pole Mounting Steps
V. Key Benefits for Network Deployment
ODN and FTTH Ready: Supports splitter integration and high-density splicing for fiber access networks.
Outdoor-Grade Protection: IP68 dome design ensures long-term durability even in harsh environments.
Flexible Installation: Suitable for various deployment scenarios – aerial, manhole, underground.
Maintenance Friendly: Modular trays, labeled routing, and accessible sealing design simplify repairs and upgrades.
VI. Storage & Handling
Store the product in a dry, ventilated area away from direct sunlight.
Avoid heavy pressure or impact before installation.
Ensure all accessories are available before beginning installation.
VII. Conclusion
GJS-M9/JFT-A Dome Closure is a premium-grade, high-capacity splice protection solution optimized for next-generation fiber optic networks. Its robust construction, flexible layout, and IP68-rated sealing make it ideal for service providers deploying high-reliability infrastructure in demanding environments.
For further technical support or free sample inquiries, please contact Spring Optic – your trusted fiber connectivity partner.
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