Compact, High-Performance Closure for Small and Medium Networks

The Prysmian CMJ (Compact Multi-function Joint) is a versatile closure ideal for track, spur, distribution, or cable chamber applications, offering a maximum capacity of 144 fibres in a compact, easy-to-handle housing.

Key Features

• Up to 12 splice trays, each accommodating 12 fibres (144-fiber capacity).
• Supports single-element or single-circuit tray configurations.
• 4 circular ports, 1 oval port, and 2 emergency ports for flexible cabling options.
• Mechanical and heat-shrink sealing options for various cable diameters.
• Integrated loop storage basket for mid-span applications.
• Optional pole/wall mounting brackets, valves, and splitter integration.

Ideal for compact joints in access or distribution networks, the CMJ combines flexibility with Prysmian’s trusted sealing and fiber management.

Enhanced Capacity for Distribution and Backbone Networks

The Prysmian MMJ (Medium Multi-function Joint) builds on the CMJ platform, increasing capacity to 288 fibres and offering greater flexibility for network expansion and feeder applications.

Key Features

• Up to 24 single-element trays (12 fibres each) or 48 single-circuit trays (4 fibres each).
• Capacity for 2 optical splitters integrated into the manifold.
• 4 circular ports, 1 oval port, and 2 emergency ports for up to 23mm cable diameters.
• Mechanical sealing glands and multi-way entry kits for multiple small cables per port.
• Individual tray access—hinged design avoids disturbance to live fibres.
• Available with mounting brackets, pressure relief valves, and testing options.

The MMJ offers a balanced solution between compactness and capacity — making it ideal for regional networks, FTTx aggregation points, and rural deployments.

High-Capacity Closure for Backbone and High-Density Networks

The Prysmian LMJ (Large Multi-function Joint) is the largest joint closure in the range, supporting capacities up to 4,032 fibres, making it ideal for backbone, metro, or large-scale distribution networks.

Key Features

• Available in Short, Medium, and Long Cap versions with varying tray and fibre capacities:
  • LMJ Short Cap: up to 1,728 fibres
  • LMJ Medium Cap: up to 2,880 fibres
  • LMJ Long Cap: up to 4,032 fibres
• Supports Single Element (SEM) and Single Circuit (SCM) tray configurations.
• 10 circular ports and 1 oval port, accommodating cables from 4mm to 23mm.
• Integrated loop storage for mid-span and in-line jointing.
• Compatible with splitters, micro-modules, and ribbon splicing.
• Tested and sealed to IP68, ensuring robust protection in buried, pedestal, or aerial environments.

With modular tray systems and upgrade kits, LMJ closures can be expanded or reconfigured as network demands grow — a true long-term solution for high-capacity fibre infrastructure.

Each Prysmian closure supports a wide range of accessories and tools, including:

• Mechanical entry glands and multi-way port kits
• Heat-shrink entry kits for larger cable sizes
• Splice protectors and splitter modules
• Mounting brackets (pole, wall, or flat)
• External tube fixation and loop management kits
• Gland tools, removal kits, and silicone grease packs

Cable Accessories Ltd also provides custom kitting, allowing you to receive closures pre-packed with all required accessories for your project.

• National & Regional Backbone Networks
• FTTH / FTTx Access and Distribution
• Industrial and Utility Fibre Installations
• Metro Rings and Rural Deployments
• Rail, Road, and Infrastructure Networks

Prysmian Partner in Ireland

• Stock & Logistics – Local inventory for faster delivery across Ireland.
• Kitting & Customisation – Closure kits tailored to each project’s specification.
• Technical Support – Expert advice from selection through installation.
• Comprehensive Range – CMJ, MMJ, LMJ, and full Prysmian connectivity solutions available.

Build your network with proven Prysmian closure technology — supplied, stocked, and supported by Cable Accessories Ltd, Prysmian’s trusted partner in Ireland.

Call us today to discuss your project requirements.

• Compact Multi-function Joint – CMJ Data Sheet
• Medium Multi-function Joint – MMJ Data Sheet
• Large Multi-Function Joint (LMJ) Data Sheet