The GYTZA fiber optic cable is a high-performance outdoor cable designed for demanding applications. GYTZA optical cable involves enclosing single-mode or multi-mode optical fibers in loose tubes made of high modulus polybutylene terephthalate (PBT) material, filled with gel. The tube is filled with waterproof compounds. In the center of the cable core, there is a metal reinforced core. Loose tube and the. ITEM: Stranded Loose Tube Flame retardant Outdoor Optic Fiber Cable Fiber Cores: 2~288 Cores Outer Jacket: Flame retardant PE Standard: GYTZA53 cable complies with Standard YD/T901-2010 as well as MT386-1995.