Optical Cable Structure Types:
Stranded Structure: The loose tubes of the optical fibers are stranded around a central reinforcing member. This provides greater fiber length safety and is more suitable for medium to large spans (e.g., over 500 meters), better handling stress variations during long-distance installation.
Central Tube Structure: Compact structure, lightweight, and with low wind and ice loads, but limited fiber length. Typically suitable for short to medium spans (e.g., 100-500 meters).
Mechanical Performance Parameters:
Maximum Allowable Tension (MAT): The maximum tensile force the optical cable can withstand during installation.
Annual Average Operating Tension (EDS): The average tension the optical cable withstands during long-term operation, typically 20%-40% of MAT.
Ultimate Tensile Strength (UTS):The minimum tensile force required for the optical cable to break.
These parameters are determined by the amount and quality of aramid yarn used and are the direct basis for calculating the span. The greater the span, the greater the tension generated by the self-weight of the optical cable and environmental loads (wind, ice), and the higher the strength requirements for the aramid yarn.