Fiber optic cable dimensions for smart buildings in the Democratic Republic of Congo

For smart building installations in the DRC, tight-buffered indoor fiber optic cables with multimode cores of 50/125 µm or 62.5/125 µm are commonly used, with overall cable diameters ranging from 3 mm to 6 mm depending on fiber count and jacket type.

Cable Types and Core Sizes

Indoor fiber optic cables for smart buildings are typically tight-buffered, which makes them flexible, easy to handle, and suitable for short to medium distances such as LANs, data centers, and building backbones . The most common core sizes are:

• Multimode fiber (MMF): 50/125 µm or 62.5/125 µm, ideal for high-speed LANs and premises networks .
• Single-mode fiber (SMF): 9/125 µm, used for longer-distance connections or hybrid backbone networks within large buildings or campuses . The overall cable diameter depends on the number of fibers and protective layers:
• 2–12 fibers: typically 3–4 mm outer diameter
• 24–48 fibers: 5–6 mm outer diameter
• Jacket materials: PVC for indoor use, low-smoke zero-halogen (LSZH) for fire safety in commercial buildings .

Installation Considerations

• Indoor routing: Cables can be installed in conduits, trays, or directly along walls and ceilings. Bare OSP cables should only extend about 15 meters indoors before termination in fire-rated cables .
• Hybrid cables: Some smart buildings use hybrid cables combining single-mode and multimode fibers to allow future expansion and high-speed backbone connectivity .
• Distance and speed: Multimode fibers are cost-effective for distances up to 500 meters at speeds up to 10 Gb/s, while single-mode fibers support virtually unlimited expansion and higher speeds .

Context in the DRC

Recent projects in the DRC, such as the BCS and EIB-backed fiber optic network, are expanding high-speed connectivity to homes, schools, hospitals, and smart buildings . These deployments often use indoor tight-buffered multimode fibers for building networks, while single-mode fibers are used for backbone connections between buildings or campuses . The infrastructure supports both structured cabling for smart buildings and integration with regional fiber backbones.

Summary

For smart buildings in the DRC:

• Preferred fiber type: Tight-buffered multimode (50/125 µm or 62.5/125 µm) for indoor LANs; single-mode (9/125 µm) for backbone or long-distance links.
• Cable diameter: 3–6 mm depending on fiber count and jacket type.
• Jacket material: PVC or LSZH for indoor safety.
• Installation: Conduit or tray routing, hybrid cables for future-proofing, and adherence to fire safety codes. This configuration ensures high-speed, reliable, and scalable connectivity suitable for smart building applications in the DRC .