What are the different span types of ADSS optical cables

ADSS optical cables are categorized by span type into short, medium, and long-span designs, each optimized for specific distances between support structures.

Short-Span ADSS Cables

Short-span cables are designed for distances typically up to 50 meters between poles. An example is the GYFXTBY fiber optic cable, which is ideal for urban or compact installations where poles are closely spaced. These cables are lightweight and easy to install but are limited in tensile strength and span length, making them suitable for short-distance aerial applications .

Medium-Span ADSS Cables

Medium-span cables cover distances ranging from 50 meters to 200 meters. Examples include ASU cables and ADSS-S cables. ADSS-S cables feature a single-jacket design, providing increased protection and durability while maintaining flexibility for medium-span aerial installations. These cables are commonly used in suburban or rural areas where moderate distances between poles are required .

Long-Span ADSS Cables

Long-span cables are engineered for extended distances between support structures, from 200 meters up to 700 meters. The ADSS-D cable is a typical long-span design, featuring a double-jacket configuration that enhances resistance to environmental factors such as wind, ice, and UV exposure. These cables are suitable for high-voltage transmission lines and backbone network routes, where mechanical strength and environmental durability are critical .

Structural Variations Affecting Span

ADSS cables also differ in internal structure, which influences their span capability:

• Central Tube Structure: Fibers are placed in a loose tube filled with water-blocking material, wrapped with aramid yarn for tensile strength, and extruded with PE or AT sheath. This design is lightweight and compact but supports shorter spans .
• Stranded Structure: Multiple loose tubes are wound around a central reinforcement (usually FRP), allowing longer fiber lengths and higher tensile strength, making it suitable for medium to long spans .

Summary

The choice of ADSS cable span type depends on installation distance, environmental conditions, and mechanical load requirements. Short-span cables like GYFXTBY are ideal for compact urban setups, medium-span cables like ADSS-S suit suburban or rural installations, and long-span cables like ADSS-D are designed for high-voltage or long-distance aerial routes. Structural design—central tube or stranded—further determines the cable's tensile strength and maximum span .