The structure of the GYTC8A optical cable is as follows: 250 µm optical fibers are inserted into loose tubes made of high-modulus material, and the loose tubes are filled with a waterproof compound. At the center of the cable core is a metallic central strength member. The loose tubes (and fillers) are stranded around the central strength member to form a compact and circular cable core. The cable core is longitudinally wrapped with a layer of plastic-coated aluminum tape (APL) and then integrated with stranded steel wires into a figure-8 polyethylene sheath. Yangtze Optical Fibre and Cable Co., Ltd. can also provide figure-8 optical cables with Y-sheath or S-sheath, such as GYTC8Y and GYTC8S. These products are mostly used for self-supporting aerial installation.

• The stranded steel wire has extremely high tensile strength, facilitating self-supporting aerial installation and reducing installation costs.

• The optical cable has excellent mechanical performance and temperature characteristics.

• The loose tube material itself has good hydrolysis resistance and high strength.

• The tubes are filled with a special grease to provide critical protection for the optical fibers.

• The following measures are adopted to ensure the waterproof performance of the optical cable:

- Single steel wire central strength member

- Loose tubes filled with a special waterproof compound

- Complete cable core filling

- Plastic-coated aluminum tape (APL) moisture barrier