Outdoor optical cable can be blown

Yes, outdoor optical fiber cables can be installed using the blowing method, which uses high-speed airflow to push the cable through pre-installed ducts.Overview of Cable Blowing

Blowing, also known as jetting, is a method for installing fiber optic cables into ducts or conduits by combining a mechanical pushing force with high-speed compressed air . This technique reduces friction between the cable and the duct, allowing long lengths of cable to be installed efficiently without excessive tension . It is particularly suitable for loose tube cables, microcables, and microduct systems designed for air-assisted installation .

Suitable Cable Types

• Loose tube cables: Commonly used for outdoor duct installations; can be blown, jetted, or pulled .
• Microcables and miniaturized cables: Smaller diameter cables that reduce friction and allow higher fiber counts in limited duct space .
• Standard optical fiber cables: Uni-tube, multi-tube, armored, or unarmored cables can also be installed using blowing, depending on their stiffness and construction .

Installation Procedure

1. Preparation: Push several hundred meters of cable into the duct using a mechanical pusher or tractor mechanism.
2. Air Injection: Compressed air is introduced at the duct inlet, creating a high-speed airflow that helps the cable “float” inside the duct, reducing contact friction .
3. Blowing Head: The cable is attached to a blowing head with seals that grip it, ensuring controlled movement through the duct .
4. Monitoring: Air pressure and pushing force must be carefully controlled to prevent damage to the cable jacket or fiber breakage. Temperature and duct size are also critical factors .

Advantages

• Allows installation of long cable lengths without splicing.
• Reduces mechanical stress on the fiber, preserving optical performance.
• Enables installation in complex duct routes, including bends and undulations.
• Compatible with high-density microduct systems for scalable network expansion .

Precautions

• Use cables with low friction coefficients to minimize required air pressure.
• Avoid excessive pushing force to prevent buckling or sheath damage.
• Ensure the duct is slightly larger than the cable for smooth installation.
• Consider environmental factors such as temperature, as cold conditions can make the cable brittle . In summary, blowing is a widely accepted and effective method for installing outdoor optical fiber cables, especially in ducted environments, and is compatible with a variety of cable types designed for air-assisted deployment. Proper preparation, cable selection, and careful control of air pressure and pushing force are essential for a successful installation.