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FZOHBMU-SD is a loose tube fiber optical cable and intended for outdoor use in ducts. The design can incorporate 6- 432 fibers in loose tubes. The individually colored fibers are tubed in groups of 6, 12 or 24f, and stranded onto a central dielectric fiber reinforced strength member (FRP). The cable type is longitudinal water blocked through the use of swellable tape. Polyethylene coated aluminum tape are used as a moisture barrier and mechanical protection. The cable has an outer sheath of halogen- free black polyethylene