Outdoor communication optical cable laying

Outdoor optical cable installation involves careful planning, trenching or aerial setup, controlled cable pulling, and precise splicing to ensure reliable communication.

Preparation and Planning

Before installation, conduct a site survey to assess terrain, environmental conditions, and potential obstacles. Determine the cable type based on exposure, mechanical stress, and environmental factors, such as armored cables for direct burial or aerial cables for pole installation . Prepare all necessary materials, machinery, and human resources, and obtain required authorizations from local authorities . Ensure safety measures, signage, and environmental protections are in place.

Cable Handling and Storage

Keep cables on protected reels until installation. Avoid sharp bends, kinks, or pulling over edges. Use figure-8 loops when laying cable temporarily to prevent twisting and mechanical stress . Maintain proper storage temperatures and protect cables from moisture, UV exposure, and physical damage.

Laying Methods

1. Underground Pipeline Laying

• Excavate a trench at least 60 cm deep (deeper in frozen soil areas) and lay a 10 cm sand cushion at the bottom to prevent damage from stones .
• Clear ducts with a rod, pre-install a pulling rope, and apply silicone grease to reduce friction.
• Insert the cable through sub-tubes, protecting unused ends with plugs. Pull the cable from the middle to both ends, with personnel assisting at manholes to minimize tension .

2. Direct Underground Laying

• Lay armored cables directly in the trench without conduits. Ensure reinforced protection against soil pressure, moisture, and rodents .
• Maintain smooth curves and avoid sharp turns. Use tension controllers to prevent exceeding the cable's maximum tensile strength .

3. Aerial Laying

• Install cables on poles or pylons using hoop steel bands and suspension fittings.
• Reserve a 0.5% sag to prevent wind-induced swinging. Use guiding pulleys and swivel connectors to reduce torque during mechanical pulling .

Cable Pulling and Splicing

• Pull cables at a controlled speed, typically ≤15 m/min, monitoring tension continuously .
• Splicing should be performed in a splice closure with humidity below 70%. Clean fibers with alcohol wipes and lint-free paper, and use a fusion splicer with correct discharge parameters. Protect splices with heat-shrink sleeves, positioning them at the center of the clamp plate .

Post-Installation Checks

• Inspect the cable for mechanical damage and ensure proper alignment in ducts or aerial spans .
• Verify signal integrity and perform tests to confirm minimal attenuation. Document cable routes, splice locations, and protective measures for future maintenance .

Safety and Environmental Considerations

• Follow all local regulations and safety protocols.
• Minimize environmental impact by restoring trenches and protecting surrounding areas.
• Ensure personnel are trained in handling optical cables and using tension control equipment . By following these procedures, outdoor optical cables can be installed efficiently, safely, and with minimal signal loss, ensuring long-term reliability for communication networks.