The fibers, either of single-mode or multimode type, are placed in a loose tube made of a high modulus plastic. The tubes are filled with a water-resistant filling compound. A steel wire locates in the center of core as a metallic strength member. The tubes (and fillers) are stranded around the strength member into a compact and circular cable core. After an APL (Aluminum Polyethylene Laminate) moisture barrier is applied around the cable core this part of cable accompanied with the stranded wires as the supporting part are completed with a polyethylene sheath to be figure 8 structures. This kind of cable is specifically applied for self-supporting aerial installation.

• Accurate fiber excess length ensures good performance of tensile strength and temperature
• High strength loose tube and special tube filling compound to ensure a critical protection of fiber
• The following measures are taken to ensure the cable watertight:
  
  1. Single steel wire used as the central strength member
  2. Loose tube filling compound
  3. 100% cable core filling
  4. Coated Aluminum tape for enhancing moisture-proof