GYDTS fiber optic cable is with corrugated steel tape armored and it is a ribbon type fiber cable which is suitable for installation in aerial or duct environment esp ecially where high density fibers are expected. 3-2009 Optical fiber ribbon cable for access. According to their design, ribbon optical cables are intended to have a large number of optical fibers transferred in a small volume, organized, and most efficiently. A central metal strength member provides robust structural support.