1. Good mechanical and temperature performance 2. High strength loose tube that is hydrolysis resistant 3. Special tube filling compound ensure a critical protection of fiber 4. Crush resistance and flexibility 5. The following measures are taken to ensure the cable watertight: 6. Steel wire used as the central strength member 7. Loose tube filling compound 8.100% cable core filling 9. PSP enhancing moisture-proof 10. Water-blocking material