Does Gyta5 fiber optic cable need a sheath for direct burial

These corrugated steel tape and aluminum tape armored and double sheath cables are suitable for installation in harsh environments where mechanical impact on the cable is to be expected. in direct buried application. The cable adopts a stranded loose tube structure with gel-filled tubes and core flooding for water blocking. They are also suitable for installation in ducts where the rodent resistance. While both cables are used in telecom and data networks, their structural differences make them suitable for unique applications, especially concerning direct burial and mechanical protection requirements. After PSP is applied over the inner sheath, the cable is completed with a PE outer sheath....