A. Loose tubes or some fillers stranded around the metallic central strength member.
B. The cable core is filled with cable filling compound.
C. An aluminum polyethylene Laminate(APL)is applied around the cable core and further sheathed with High Density Polyethylene(HDPE).
D. Tubes and fillers are stranded around the central strenth member into a compact and circular cable core.

Characteristics:
A. Accurate fiber excess length ensures good performance under mechanical stress and good temperature performance.
B. Materials of loose tubes are of good temperature performance and high Young's modulus.
C. Tubes, cable core and all interstics are filled with special tube filling compound to ensure long term stability in transmission for two long wavelenth windows, moisture-proof and absence of longitudinal water ingress.
D. The central length member is made of phosphatized steel wire with high modulus.
E. The corrugated aluminum tape is laminated at both sides with polyethylene and bonded tightly with PE sheath. It ensures moisture-proof of the cable and reinforces the latter's crush resistance.