How to make the tension point of communication optical cable

The tension point of an optical cable is established by applying controlled tension during aerial installation to maintain proper sag, prevent abrasion, and ensure mechanical stability.Understanding Tension in Optical CablesThe tension point refers to the location and condition where the cable is held under a specific tension during installation. Proper tension ensures the cable hangs safely between poles or towers, avoids contact with the ground or obstacles, and maintains signal integrity. Tension is influenced by cable weight, span length, environmental loads (wind, ice), and temperature variations ( ).Equipment RequiredTo establish and maintain the tension point, the following equipment is typically used ( ):Tension machine or traction machinePay-off machine for cable reelsPulleys and guide rollersTensionless steel wire or pre-stranding wireTorsion releaser and anti-torsion whipSag board and theodolite for measurementCommunication devices (intercom or radio) for coordinationSafety equipment: helmets, harnesses, gloves, and protective clothingSteps to Establish the Tension PointPreparation: Review design drawings and spanning charts. Determine the span lengths, pre-reserved splice points, and environmental conditions ( ).Cable Pay-Off: Insert the cable from the reel into the tensioning equipment. Wrap the cable around the tension roller multiple times to ensure controlled traction ( ).Applying Tension: Use the tension machine to apply a constant, controlled tension. The tension should be sufficient to keep the cable suspended without sagging excessively but below the maximum allowable tension to prevent fiber damage ( ).Monitoring Sag: Measure sag using a sag board or theodolite. Adjust tension as needed to maintain the desired sag, typically around 1% of the span length or as specified in the design ( ).Progressive Laying: Slowly advance the cable along the span, ensuring it passes smoothly over pulleys and guide rollers. Gradually increase speed once the cable is stable ( ).Securing the Cable: Once the cable reaches the tension point at the tower or pole, secure it with clamps or anchors. Ensure the tension remains consistent and check for torsion or twisting ( ).Safety and Environmental ConsiderationsAvoid excessive tension that could damage the fiber or cable jacket.Consider wind, ice, and temperature effects on tension and sag ( ).Ensure all personnel use proper safety gear and maintain 3-point contact when climbing poles or towers ( ).Use grounding and lightning protection if installing near power lines ( ).SummaryCreating the tension point involves careful planning, proper equipment, and controlled tension application. By following design specifications, monitoring sag, and adjusting tension during installation, the optical cable can be safely suspended, minimizing mechanical stress and ensuring long-term performance.